| 1. |
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| 2. |
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INNOTRACK: Concluding technical report
- 2010
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Samlingsverk (redaktörskap) (refereegranskat)abstract
- The track structure, rails, switches and crossings account for more than 50% of maintenance and renewal costs for the rail industry. To improve the competitiveness of rail transportation, the cost-efficiency of these areas needs to be addressed.This the background to INNOTRACK, an integrated research project funded by the European Commission’s 6th research framework pro- gramme. Running from September 2006 to December 2009, INN- OTRACK has developed a multitude of innovative solutions in the areas of track substructure, rails & welds, and switches & crossings. The solutions have been assessed from technical, logistics and life cycle cost point of views.This Concluding Technical Report of INNOTRACK includes an overview of the project. It further details implementable results, and clusters them into ”highlight” areas. In addition, the book acts as a ”key” to the vast amount of information from INNOTRACK: All sections refer to project reports where more information can be found.
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| 3. |
- Brahma, Arindam, 1987, et al.
(författare)
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A study on the mechanisms of change propagation in mechanical design
- 2021
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Ingår i: Journal of Mechanical Design - Transactions of the ASME. - : ASME International. - 1050-0472. ; 143:12
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Tidskriftsartikel (refereegranskat)abstract
- Design changes and change propagation have been recognized as ubiquitous in the engineering design process. But why are some design changes propagated while others are absorbed? This paper reports on a study to investigate the specific properties of a mechanical design that influence whether a change is either propagated or absorbed. Student participants in the study were asked to complete a well-defined mechanical design task and then to introduce several design changes. Analysis of the recorded design processes reveals new insight into the mechanisms of change propagation in terms of properties of the design. The insights suggest avenues for future research to make designs more tolerant to potential future change and to develop improved methods to predict change propagation.
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| 4. |
- Högman, Ulf, 1961, et al.
(författare)
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Requirements on New Technology and the Technology Implementation Process
- 2010
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Ingår i: 8th International NordDesign Conference, NordDesign 2010; Goteborg; Sweden; 25 August 2010 through 27 August 2010. ; 2, s. 289-300
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Konferensbidrag (refereegranskat)abstract
- In literature, many authors have pointed to the importance of technology and technology development for company competitiveness. In this study we aim to study the technology in more detail and attempt to develop an understanding on the requirements and needs on “technology” from the perspective of product development. The research question which we aim to answer in this study is:“What are the requirements on maturity of technology when this technology is about to enter into the product development process?“A qualitative research strategy, based on three study cases involving 17 interviewees, has been chosen. All three cases come from one single company, Volvo Aero Corporation (VAC) in Sweden, in the context of the aero engine industry. The study contributes with a broad mapping of requirements and how they relate to different categories of technologies, showing big differences both regarding content and timing. It is concluded that attention should be payed both to how the organization builds new capabilities and to the capabilities of the technology itself. A surprisingly complicated picture on the requirements relating to the implementation of new technologies has emerged in the study. This contributes to the understanding regarding the difficulties of developing new technology and integrating it into an application.
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| 5. |
- Yang, Shun-Han, 1987, et al.
(författare)
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Parametric study of the dynamic motions and mechanical characteristics of power cables for wave energy converters
- 2018
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Ingår i: Journal of Marine Science and Technology. - : Springer Science and Business Media LLC. - 0948-4280 .- 1437-8213. ; 23:1, s. 10-29
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Tidskriftsartikel (refereegranskat)abstract
- A case study of a point-absorber wave energy converter (WEC) system is presented. The WEC system forms an array, with several WECs located around a central hub to which they are each connected by a short, free-hanging power cable. The objective of the study is to analyse the dynamic characteristics and estimate the fatigue life of the power cable which is not yet in use or available on the commercial market. Hence, a novel approach is adopted in the study considering that the power cable’s length is restricted by several factors (e.g., the clearances between the service vessel and seabed and the cable), and the cable is subject to motion and loading from the WEC and to environmental loads from waves and currents (i.e., dynamic cable). The power cable’s characteristics are assessed using a numerical model subjected to a parametric analysis, in which the environmental parameters and the cable’s design parameters are varied. The results of the numerical simulations are compared and discussed regarding the responses of the power cables, including dynamic motion, curvature, cross-sectional forces, and accumulated fatigue damage. The effects of environmental conditions on the long-term mechanical life spans of the power cables are also investigated. Important cable design parameters that result in a long power cable (fatigue) service life are identified, and the cable service life is predicted. This study contributes a methodology for the first-principle design of WEC cables that enables the prediction of cable fatigue life by considering environmental conditions and variations in cable design parameters.
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| 6. |
- Heshmati, Mohsen, 1987, et al.
(författare)
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Dependency of cohesive laws of a structural adhesive in Mode-I and Mode-II loading on moisture, freeze-thaw cycling, and their synergy
- 2017
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Ingår i: Materials and Design. - : Elsevier BV. - 1873-4197 .- 0264-1275. ; 122, s. 433-447
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Tidskriftsartikel (refereegranskat)abstract
- In recent years, adhesive bonding has found its way to construction applications such as bridges. Given the harsh conditions that such structures are usually exposed to, it is necessary to account for environmental factors, particularly moisture and temperature, in the design phase. Cohesive zone modelling has attracted much attention in the last decade as a promising method to design adhesive joints. Despite this interest, the effects of moisture and thermal cycles on cohesive laws have not been investigated to the knowledge of the authors. In this paper, we present a method to directly measure the environmental-dependent cohesive laws of a structural adhesive loaded in pure Mode-I and Mode-II. Special consideration is given to overcome issues such as the time-consuming nature of moisture ingression and specimen dimensions, which could be problematic due to the size-limitations of conditioning equipment. The accuracy of this method was verified through simulation of the experiments using the finite element analysis. The effects of exposure to 95% relative humidity, immersion in saltwater and distilled water, and freeze-thaw cycles in the presence or absence of moisture were investigated. The results indicate the damaging effects of combined saltwater and freeze-thaw cycles which were clearly reflected on the shape of the cohesive laws.
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| 7. |
- Evertsson, Magnus, 1967, et al.
(författare)
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Control systems for improvement of cone crusher yield and operation
- 2014
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Ingår i: Proceedings of Comminution '14.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Gyratory and cone crushers are regaining interest and are becoming more frequently used in order to create more energy efficient comminution circuits. A typical example is found in coarse comminution circuits were HPGRs are used as a first milling stage. In this case the preparation of a suitable feed with a well-defined width of the particle size distribution and a controlled top size are of high importance. In turn, this emphasizes the importance of a stable and controlled operation of the preceding crushing stages. Control systems for cone and gyratory crushers were first introduced during the early 60ths. The common opinion is that if these systems are able to compensate for the wear of the crushing liners the production yield can be increased with 20-25%. Over the years these types of systems have been widely used but the theory behind the principles have not been thoroughly scientifically scrutinized and presented. Of special interest is the capability to protect the crushers from long term overloading commonly defined as fatigue.With developments in electronics and plant control the crusher control systems have become more refined over the years. Though, there are sometimes conflicting interests in the control strategies between process requirements and crusher protection. In the paper an overview of the challenges, opportunities and existing control systems for cone and gyratory crushers is presented. A requirement specification for a system that is possible to fully integrate into modern plant control systems is outlined.
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| 8. |
- Evertsson, Magnus, 1967, et al.
(författare)
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Monitoring and validation of life time prediction of cone crusher with respect to loading and feeding conditions
- 2016
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Ingår i: Comminution 16. - 9781510826670 ; 904 (1 Vol)
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Konferensbidrag (refereegranskat)abstract
- The interest and need for compressive crushing in gyratory, cone and HPGR crushers are increasing since ores become more competent and more difficult to break. Compressive crushing is energy efficient as a consequence of the crushing principle and the imposed stress-state. The stress variations can be described by stress amplitudes and it is a known fact that many different materials, components and machines suffer from cyclic loading which shortens the service lifetime. This phenomena is explained by density variations of the particle beds in the equipment which in turn originates from particle segregation and feeding alignment. The phenomena is often called fatigue and the consequence is premature breakdowns and a relatively shorter lifetime than expected. In this paper, a previously developed theory for lifetime assessment of cone crushers will be used as a foundation for evaluation of full-scale operating cone crushers in minerals processing plants. Lifetime is calculated as a consequence of the load spectrum. The data shows that improper feeding conditions will substantially decrease the lifetime of the crusher equipment leading to excessive operating costs. An adequate control system should be able to recognise the hazardous lifetime decreasing overloads and to warn the operator. There are sometimes conflicting interests in the control strategies between production yield (process requirements) and crusher protection.
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| 9. |
- Linnéusson, Gary, et al.
(författare)
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Towards strategic development of maintenance and its effects on production performance by using system dynamics in the automotive industry
- 2018
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Ingår i: International Journal of Production Economics. - : Elsevier. - 0925-5273 .- 1873-7579. ; 200, s. 151-169
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Tidskriftsartikel (refereegranskat)abstract
- Managing maintenance within an economical short-termism framework, without considering the consequential long-term cost effect, is very common in industry. This research presents a novel conceptual system dynamics model for the study of the dynamic behaviors of maintenance performance and costs, which aims to illuminate insights for the support of the long-term, strategic development of manufacturing maintenance. By novel, we claim the model promotes a system's view of maintenance costs that include its dynamic consequential costs as the combined result of several interacting maintenance levels throughout the constituent feedback structures. These range from the applied combination of maintenance methodologies to the resulting proactiveness in production, which is based on the rate of continuous improvements arising from the root cause analyses of breakdowns. The purpose of using system dynamics is to support the investigations of the causal relationships between strategic initiatives and performance results, and to enable analyses that take into consideration the time delays between different actions, in order to support the sound formulation of policies to develop maintenance and production performances. The model construction and validation process has been supported by two large maintenance organizations operating in the Swedish automotive industry. Experimental results show that intended changes can have both short and long-term consequences, and that obvious and hidden dynamic behavioral effects, which have not been reported in the literature previously, may be in the system. We believe the model can help to illuminate the holistic value of maintenance on the one hand and support its strategic development as well as the organizational transformation into proactiveness on the other.
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| 10. |
- Löfstrand, Magnus, et al.
(författare)
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A model for predicting and monitoring industrial system availability
- 2012
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Ingår i: International Journal of Product Development. - Bucks, United Kingdom : InderScience Publishers. - 1477-9056 .- 1741-8178. ; 16:2, s. 140-157
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Tidskriftsartikel (refereegranskat)abstract
- This paper describes the integration of a sensor data stream monitoring system into a proposed functional product model capable of predicting functional availability. Such monitoring systems enable predictive maintenance to be carried out pre-emptive maintenance that is scheduled in response to imminent hardware failure and are in widespread use in industry. The industrial motivation for this research is that agreed upon system availability is a critical element of any business-to-business agreement regarding functional sales. Such a model is important when making strategic choices regarding FPs and can be used to develop a high availability product design through simulation driven development, as well as to provide operational decision support that reflects the current reality to enable optimal availability to be achieved in practice. The proposed model integrates hardware, support system and monitoring system models, and is able to incorporate actual operational data. It has been partly verified based on previous research.
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| 11. |
- Löfstrand, Magnus, 1974-, et al.
(författare)
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A model for predicting and monitoring industrial system availability
- 2012
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Ingår i: International Journal of Product Development. - Bucks, United Kingdom : InderScience Publishers. - 1477-9056 .- 1741-8178. ; 16:2, s. 140-157
-
Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- This paper describes the integration of a sensor data stream monitoring system into a proposed functional product model capable of predicting functional availability. Such monitoring systems enable predictive maintenance to be carried out pre-emptive maintenance that is scheduled in response to imminent hardware failure and are in widespread use in industry. The industrial motivation for this research is that agreed upon system availability is a critical element of any business-to-business agreement regarding functional sales. Such a model is important when making strategic choices regarding FPs and can be used to develop a high availability product design through simulation driven development, as well as to provide operational decision support that reflects the current reality to enable optimal availability to be achieved in practice. The proposed model integrates hardware, support system and monitoring system models, and is able to incorporate actual operational data. It has been partly verified based on previous research.
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| 12. |
- Reed, Sean, 1982-, et al.
(författare)
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Quantified economic and environmental values through Functional Productization : A simulation approach
- 2018
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Ingår i: Environmental impact assessment review. - : Elsevier. - 0195-9255 .- 1873-6432. ; 70, s. 71-80
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Tidskriftsartikel (refereegranskat)abstract
- Industrial companies rely on hardware and services from external providers to deliver functions that are critical to their operations, increasingly demanding solutions that not only meet technical and availability requirements but are sustainable too. Traditionally, industrial companies choose and purchase hardware and maintenance support to fulfil their functional requirements. An alternative arrangement, known as Functional Product (FP), involves external providers supplying customers with the functionality they require through contracts that specify guaranteed functional availability whilst giving providers freedom to choose and retain ownership of the supplied hardware and services. This paper describes an innovative simulation modelling and optimization approach to quantitatively compare economic and environmental values resulting from transition from traditional to FP arrangements. The approach is demonstrated through the analysis of a scenario involving a hydraulic drive system provider and set of customers in Sweden, with the results exhibiting simultaneous improvement in economic and environmental values at each stage of the transition.
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| 13. |
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| 14. |
- Kumar, Mayank, 1991-
(författare)
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Friction in threaded fasteners : Influence of materials and tooling
- 2022
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Threaded fasteners represent the most common type of machine element, with a unique function that facilitates ease of assembly and disassembly. This ease of disassembly allows machine parts to be reused, refurbished, and recycled. Easy as these components are to assemble, several factors must be considered to achieve the desired clamp force and to utilize the fastener to its full load capacity. The research presented in the thesis compares different tightening strategies and assembly tools to show that the clamp force and it´s scatter are influenced by the variation in the coefficient of friction (CoF) to a much larger extent than by the accuracy of an assembly tool. The research therefore focus on understanding the frictional response in a threaded fastener joint during tightening.A range of design and assembly factors are considered to identify how to increase reliability of the threaded fastener joints. These factors include tightening speed, coating, surface topography, fastener storage conditions, cutting fluid residue and joint material. A torque-controlled, two-step tightening method was mainly used in the studies as it is widely practiced across the production floor of the motor vehicle and general industries to tighten threaded fastener joints. A state-of-the-art friction test rig (FTR) was built to quantify variations in the CoF in the thread and under-head contacts during tightening. Coatings and contact surfaces are also characterized using SEM, FIB, indenters, and optical microscopes to gain an insight to find the likely reasons behind CoF variation. Fasteners with different Zn-based coatings were tightened on plates with surface topographies similar to those found in the motor vehicle industry. The samples were not cleaned before the testing but used "as-received" from the supplier. The degree of damage to the joint surface and fastener thread from the tightening depends on the hardness of the coating. The hardest coating (Zn-Ni) remained relatively unchanged but gave twice as high CoF in the under-head contact compared to the softest coating (Zn-flake). The under-head friction often dominates the tightening process and may be significantly affected by the joint surface topography and the level of cleanliness. In the automotive industry, many parts to be assembled are not thoroughly cleaned, increasing the risk of cutting fluid residue on the joint surface. Different types of cutting fluids were compared in a study with fasteners tightened against “as-received" and cleaned plates. It was shown that CoF might drastically decrease depending on the coating and cutting fluid types. An ester-based fluid performed best, providing the lowest CoF in the under-head contact due to its higher viscosity and polarity. A water-based fluid showed a significantly larger scatter. Water can also influence friction due differences in humidity and temperature. Sometimes fasteners are stored outside a factory which could lead to water diffusion in the coating in hot-humid climate or condensation of water on the fastener surface when it is brought from the outside storage at sub-zero temperatures into the production hall. Water on the coating and inside of it could lead to low CoF, with overtightening and fastener failure as a result. Four Zn-based coatings were compared and showed different response depending on the coating structure and topcoat. Another way to reduce CoF is to use variable speed tightening. It will also increase productivity, as it is faster. It will also improve operator ergonomics, as it gives much lower reaction torque. Much higher CoF was found for EPZ coating when tightened at a constant and very low speed, 5 rpm, due to cohesion that resulted in material transfer, compared to CoF during high, variable speed tightening. At the same time, speed had negligible influence on the CoF when using soft Zn-flake coating as the coating easily sheared off, acting as a solid lubricant.A soft coating is also practical when used in contact with parts made using additive manufacturing (AM). The AM parts are often rough, but a soft coating can mitigate an increase in the under-head CoF. An interesting finding was that the cheapest solution of using an uncoated fastener works very well. An anti-corrosion oil on the plain fastener helped in achieving low CoF. When the AM plate was machined, the CoF and surface damage significantly increased due to the lay of the surface topography created by machining. The findings presented in the thesis increase understanding of how various design and assembly factors govern friction in the thread and under-head contacts. The under-head contact dominates friction response. A proper selection and adjustment of these factors will help design engineers to optimize joint designs and achieve high fastener strength utilization.
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| 15. |
- Karlsson, Stefan, 1984-, et al.
(författare)
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Non-destructive strength testing of microindented float glass by a nonlinear acoustic method
- 2023
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Ingår i: Construction and Building Materials. - 0950-0618 .- 1879-0526. ; 391
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Tidskriftsartikel (refereegranskat)abstract
- The present paper describes a method for non-destructive testing of the glass strength. Square 10 × 10 cm2 samples of annealed float glass was inflicted with a controlled defect in the centre of the atmospheric side using Vickers microindentation-induced cracking with a force of 2 N, 5 N and 10 N and compared to an un-indented reference. The samples were non-destructively tested using a nonlinear acoustic wave method resulting in defect values. The average of the defect values was found to linearly correlate to the indentation force in a log–log relationship. The samples were subsequently tested in a ring-on-ring setup that allows for an equibiaxial stress state. The indentation-induced cracking gave practically realistic strength values in the range of 45 to 110 MPa. The individual sample values for failure stress as a function of normalized defect value show linear trends with approximately half of the data within 95% confidence limit. In summary, this study provides an initial proof-of-concept for a non-destructive testing of the strength of glass.
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| 16. |
- Sarkar, Saptarshi, 1992, et al.
(författare)
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Transient torque reversals in indirect drive wind turblnes
- 2023
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Ingår i: Wind Energy. - 1099-1824 .- 1095-4244. ; 26, s. 691-716
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Tidskriftsartikel (refereegranskat)abstract
- The adverse effect of transient torque reversals (TTRs) оп wind turЬine gearboxes сап Ье severe due to their magnitude and rapid occurrence compared with other equipment. The primary damage is caused to the bearings as the bearing loaded zone rapidly changes its direction. Other components are also affected Ьу TTRs (such as gear tooth); however, its impact оп bearings is the largest. While the occurrence and severity of TTRs are acknowledged in the industry, there is а lack of academic literature оп their initiation, propagation and the associated risk of damage. Furthermore, in the wide range of operation modes of а wind turЬine, it is not known which modes сап lead to TTRs. Further, the interdependence of TTRs оп environmental loading like the wind is also not reported. This paper aims to address these unknowns Ьу expanding оп the understanding of TTRs using а high-fidelity numerical model of an indirect drive wind turЬine with а douЬly fed induction generator (DFIG). То this end, а multibody model of the drivetrain is developed in SIMPACK. The model of the drivetrain is explicitly coupled to state-of-the-art wind turЬine simulator OpenFAST and а grid-connected DFIG developed in MATLAB®'s Simulink® allowing а coupled analysis of the electromechanical system. А metric termed slip risk duration is proposed in this paper to quantify the risk associated with the TTRs. The paper first investigates а wide range of IEC design load cases to uncover which load cases сап lead to TTRs. lt was found that emergency stops and symmetric grid voltage drops сап lead to TTRs. Next, the dependence of the TTRs оп inflow wind parameters is investigated using а sensitivity analysis. lt was found that the instantaneous wind speed at the onset of the grid fault or emergency shutdown was the most influential factor in the slip risk duration. The investigation enaЫes the designer to predict the occurrence of TTRs and quantify the associated risk of damage. The paper concludes with recommendations for utility-scale wind turЬines and directions for future research.
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| 17. |
- Paik, Jeom Kee, et al.
(författare)
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Full-scale collapse testing of a steel stiffened plate structure under axial-compressive loading at a temperature of −80°C
- 2021
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Ingår i: Ships and Offshore Structures. - : Informa UK Limited. - 1754-212X .- 1744-5302. ; 16:3, s. 255-270
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Tidskriftsartikel (refereegranskat)abstract
- The aim of the paper was to develop a test database of the ultimate strength characteristics of full-scale steel stiffened plate structures under axial compressive loading at a temperature of −80°C. This paper is a sequel to the authors’ articles (Paik et al. 2020a, https://doi.org/10.1016/j.istruc.2020.05.026 and Paik et al. 2020b, https://doi.org/10.1080/17445302.2020.1787930). In contrast to the earlier articles associated with room temperature or cryogenic condition, this paper investigated the effect of a low temperature at −80°C which is within the boundary range of temperature of the ductile-to-brittle fracture transition for carbon steels. A material model representing the test conditions was also proposed to capture the characteristics of carbon steels at low temperatures both in tension and in compression, and it was used in finite element method simulations of the full-scale experiment. A comparison between numerical analyses and experiments showed that the proposed model could successfully predict the failure modes and ultimate strength characteristics at low temperatures for stiffened plate structures under axial compressive loading conditions.
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| 18. |
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| 19. |
- Liwång, Hans, 1974, et al.
(författare)
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Quantitative risk analysis – Ship security analysis for effective risk control options
- 2013
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Ingår i: Safety Science. - : Elsevier BV. - 0925-7535 .- 1879-1042. ; 58:1, s. 98-112
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Tidskriftsartikel (refereegranskat)abstract
- This study reviews ship security assessment. The objectives are to explore the possibilities for quantifying and performing a more thorough ship security risk analysis than that described in the International Ship and Port Facility Security code and to evaluate to what extent this more detailed analysis increases ship security and facilitate the effective selection of risk control options.The study focuses on Somali-based maritime piracy, using piracy on the Indian Ocean as a case study. Data are collected using questionnaires and interviews with civilian and military security experts who possess firsthand experience of piracy off the coast of Somalia. The data are collected specifically for this study and describe and quantify the threat’s capability, intent and likelihood of exploiting a ship’s vulnerability. Based on the collected description of the threat, the study analyzes and describes: probability of detection by pirates, probability of successful approach, and probability of successful boarding.The performed work shows good agreement between calculated probabilities and frequencies in the cited incident reports. Also, the developed scenarios describe the most important influences on the analysed areas. The research therefore shows that the proposed risk-based approach, which uses structurally collected and documented information on the threat, can increase ship security by assisting in selecting risk control options. The approach also allows for a better understanding of the causal relationship between threat and risk than that provided in today’s security analysis by ship owners, for example. This understanding is crucial to choosing effective and robust risk control options.
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| 20. |
- Mao, Wengang, 1980, et al.
(författare)
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A comparison of two wave models and their influence on fatigue damage in ship structures
- 2013
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Ingår i: Proceedings of The ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2013). - 9780791855324 ; 2A, s. 1-9
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Konferensbidrag (refereegranskat)abstract
- In the maritime industry, fatigue failure is one of the most significant failure modes for ship structures. The fatigue damage in ship structures is mainly caused by the variation of wave loadings applied on ships, leading to variable structural stresses. Therefore, a reliable description of wave environments encountered during a ship’s service life is essential for accurate fatigue assessment of ship structures. Besides the wave scatter diagram provided by classification society rules, different statistical wave models have also been built up to model wave environments along arbitrary ship routes. The wave models could provide more specific wave environment for any chosen sailing routes of an individual ship. They may have the potential to be used for some practical applications, such as conceptual ship fatigue design, remaining fatigue life prediction when a ship plans to change its original trade region, and crack maintenance planning etc. Since the development of these models may be based on different sources, e.g. satellite measurements, hindcast data, buoys, etc., the reliability and consistence of wave generations from various wave models must be validated by the measured wave environments in order to be used for those practical applications. In this paper, waves generated from two different wave models, one based on hindcast data and one mainly on satellite data, are compared with measured wave environments encountered by a 2800 TEU container vessel on the North Atlantic route. These wave models are used in the calculation of the fatigue damage in the vessel. The results obtained using waves generated from the two wave models are compared with the fatigue damage calculated based on strain measurements in the ship. Recommendations for future development of the wave models and further investigation to make the applications more realistic for ship fatigue assessment are also presented.
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| 21. |
- Peng, Yong, et al.
(författare)
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Development of head injury risk functions based on real-world accident reconstruction
- 2014
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Ingår i: International Journal of Crashworthiness. - : Informa UK Limited. - 1358-8265 .- 1754-2111. ; 19:2, s. 105-114
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Tidskriftsartikel (refereegranskat)abstract
- The objective of this study is to assess head injury risks of adult pedestrians using computer reconstructions of the accidents. For this purpose, accident reconstructions were developed based on the real-world pedestrian accidents. The impact conditions, which were obtained from the previous study [Y. Peng, C. Deck, J.K. Yang, D. Otte, and R. Willinger, A study of adult pedestrian head impact conditions and injury risks in passenger car collisions based on real world accident data, Traffic Inj. Prev., doi: 10.1080/15389588.2012.733841] including head impact velocity, head position and head orientation, were defined as initial loading conditions in a simulation of the head striking to a windscreen by using a finite element (FE) Hybrid III head model. Logistic regression models were developed to study brain injury risk with respect to injury related variables: the head linear acceleration, HIC value, skull fracture correlate (SFC), resultant angular acceleration and head impact power (HIP). The results from Hybrid III head impact simulations indicated that the predicted head linear acceleration, HIC value, resultant angular acceleration and HIP for 50% probability of AIS 2+ and AIS 3+head injury risk are 116g, 825, 11368 rad/s(2), 37 kW and 162g, 1442, 18775 rad/s(2), 68 kW, respectively, and the predicted values of 50% probability of skull fracture is 135g. The knowledge from this study could be a prerequisite for developing guidelines to improve pedestrian safety.
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| 22. |
- Ringsberg, Jonas, 1971, et al.
(författare)
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Analysis of impact loads on a self-elevating unit during jacking operation
- 2017
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Ingår i: Journal of Offshore Mechanics and Arctic Engineering. - : ASME International. - 0892-7219 .- 1528-896X. ; 139:3, s. 1-9
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Tidskriftsartikel (refereegranskat)abstract
- A method is presented that enables the analysis of weather window assessments for the installation and retrieval phases of a self-elevating unit (SEU). The method takes site-specific parameters, defined as soil type and water depth, into account in addition to vessel-specific and environmental parameters. The inclusion of site-specific parameters is the novel contribution compared to assessment methodologies used today. A simulation model is presented that incorporates a coupled non-linear time-domain analysis of vessel motion and soil-structure interaction. Soil deformation behaviour during impact is described by resistance curves based on a bearing capacity theory. A structural evaluation criterion against which impact forces are compared is used for weather window assessments. The simulation model is applied on a case study utilizing different soil types to study impact forces and the capacity of the structure for withstanding such impacts and eventually performing a weather window assessment. The results show that the jacking operation can be divided into two phases when it comes to loads on the spudcan: a phase dominated by vertical forces followed by a phase dominated by horizontal forces. It is found that including soil deformation behaviour is of paramount importance to the magnitude of the resulting impact forces and that class-recommended practice does indeed produce rather large force estimates. Thus, assessments where site-specific parameters are incorporated could definitely increase the operable weather window for SEUs, and, consequently, increase the economic competitiveness of, for example, the offshore wind industry.
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| 23. |
- Schreuder, Martin, 1970, et al.
(författare)
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A method for assessment of the survival time of a ship damaged by collision
- 2011
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Ingår i: Transactions - Society of Naval Architects and Marine Engineers. - 0081-1661. ; 55:2, s. 86-99
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Tidskriftsartikel (refereegranskat)abstract
- Following an interdisciplinary calculation procedure, the chain of events of ship collision, flooding, and loss of stability within given time have been investigated. The method established in the current work concerns the interaction between structural and damage stability computations and has been used to study the influence of various parameters, e.g., significant wave height and size of damage opening on a RoPax-ferry damaged in a collision with a ship of similar size.
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| 24. |
- Bergsjö, Dag Henrik, 1980, et al.
(författare)
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A Model to Evaluate Efficiency,Quality, and Innovation through User Satisfaction with Information Management Systems
- 2007
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Ingår i: Proceedings of CSER'07.
-
Konferensbidrag (refereegranskat)abstract
- A statistical model for measuring user satisfaction in information management systems is presented. An evaluation of the model is made, based on previous qualitative studies as well as preliminary results of a quantitative data collection. A discussion is made of the fulfilment of statistical assumptions regarding the model. The model is tested by performing an exploratory factor analysis.Further, the future possibilities to perform a partial least squares (PLS) analysis in order to study how the proposed variables relate to user satisfaction, efficiency, information quality and innovation is discussed. The aim of this paper is to evaluate the questionnaire and statistical model by one case study.
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| 25. |
- Bergsjö, Dag Henrik, 1980
(författare)
-
The PLM user perspective: identification of user needs and their organisational impacts
- 2015
-
Ingår i: International Journal of Product Lifecycle Management. - 1743-5129 .- 1743-5110. ; 8:2, s. 172-187
-
Tidskriftsartikel (refereegranskat)abstract
- This paper concerns the user perspective when implementing and improving PLM in anorganisation. The main issues investigated are how to efficiently identify, collect andprioritise the engineers' need towards PLM. This paper presents results from one qualitativeand one quantitative case study performed at one independent automotive OEM, in Sweden.The case studies show that there are means to collect user-requirements efficiently thatrepresent both the management and the engineering needs of the organisation
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| 26. |
- Elg, Mattias, 1968-, et al.
(författare)
-
The Future of Work for Quality Management – Challenges in the Digitalized Era
- 2018
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Purpose Digitalization provides both challenges and opportunities for Quality Management (QM). The purpose of this paper is to identify challenges induced by digitalization on current QM practices, in order to uncover the potential of how QM may support digitalization in organizations. This issue is addressed through an analytical framework that stresses two dimensions: first exploration and exploitation of digitalized QM processes and second value creation, which is performed by the customer or in interaction facilitated by the provider. Design/methodology/approach This paper is based on a cross-case study design with interview data collected from 33 quality management professionals in four large Swedish organizations. Findings Six different challenges and corresponding roles are proposed for QM: The gardener involved in the design of the many different currently utilized technologies; the bridge-builder - a role that connects implemented digitalized solutions that enable the movement from human-to-human to a human-to-digital interface; the assistant a contributor to better value in the customer sphere for already implemented digitalized solutions; the architect including planning, designs, and reviews together with many different stakeholders; the connector focusing on the continuous management of value-in-use and open up for opportunities for continuous interaction and value-adding; and explorer drawing attention towards the challenges of the existing power structures. Originality/value This paper contributes with empirical evidence on challenges induced by digitalization, an area often discussed but not as often studied empirically. Further, the study identifies challenges of digitalization affecting both exploitative and explorative practices throughout an organisations value-creation process.
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| 27. |
- Eriksson, Henrik, 1973, et al.
(författare)
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Effects of In-Company Quality Awards on Organizational Performance
- 2003
-
Ingår i: Total quality management (Print). - : Informa UK Limited. - 0954-4127 .- 1360-0613. ; 14:2, s. 235-242
-
Tidskriftsartikel (refereegranskat)abstract
- The relationship between total quality management (TQM) practices and improved performance has been frequently discussed in the literature. In this paper, the costs and the effects of in-company quality awards on performance are discussed and analysed. The paper covers a survey of Swedish companies that use or have used in-company quality awards to stimulate TQM efforts and thereby to improve performance. The study cannot show any strong evidence of improved performance for units that applied for the in-company quality award. However, in contrast to units that have not applied, some units that have applied for the in-company quality award considered that the results related to performance have improved greatly. One large positive effect perceived by the participating units was increased customer orientation while the largest costs were put on the description of activities and the improvement work itself.
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| 28. |
- Eriksson, Henrik, 1973, et al.
(författare)
-
Organisational performance improvement through quality award process participation
- 2005
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Ingår i: International Journal of Quality & Reliability Management. - : Emerald Group Publishing Limited. - 0265-671X .- 1758-6682. ; 22:9, s. 894-912
-
Tidskriftsartikel (refereegranskat)abstract
- Purpose - The purpose of the study is to describe the activities initiated based on participation in a quality award process and with the intention to improve performance.Design/methodology/approach - This study presents a case study of three organisations that have participated in the Swedish Quality Award process. The cases were selected in order to clarify how this award process could be used to improve organisational performance.Findings - Several examples of activities on how to improve organisational performance are provided. Specifically, the areas of customer orientation, process orientation, continuous improvement, committed leadership and participation by everyone have been improved due to the initiated activities. Furthermore, the studied organisations have been successful in their development and communication of visions, and in their empowerment of employees.Research limitations/implications - An interesting area of further research would be to compare different methodologies for performance improvement with one another.Practical implications - Findings from the case studies, and of importance for organisations applying for quality awards, indicate that, if the goal is to get lasting results, it is not sufficient to participate in a quality award process only once. Instead one should participate in the process several times, with enough time in between the applications in order to complete as many as possible of the improvement projects resulting from the evaluations.Originality/value - It is the authors' intention that the guidelines presented in the paper might be helpful for organisations considering a participation in a quality award process.
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| 29. |
- Eriksson, Henrik, 1973
(författare)
-
Organisational value of participating in a quality award process : a Swedish study
- 2004
-
Ingår i: TQM Magazine. - : Emerald. - 0954-478X .- 1758-6887. ; 16:2, s. 78-92
-
Tidskriftsartikel (refereegranskat)abstract
- One way for organisations to support total quality management, and hence try to increase customer satisfaction is to participate in a quality award process. The purpose of this study is to explore the organisational value of participating in a quality award process. The study is based on interviews at 29 organisations that have participated in the process of the Swedish Quality Award. The main conclusion is that most of the organisations consider the process orientation, customer orientation and improvement work to have been improved as a result of the participation in the quality award process. However, there are also obstacles to surmount in order to benefit fully from the process: difficulties in finding resources within the organisation to perform mandatory work and implement identified improvements, and difficulties in applying the circumstantial model used in the quality award process.
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| 30. |
- Falck, Ann-Christine, 1949, et al.
(författare)
-
A calculation model for ergonomics cost-benefit analyses in early product development stages
- 2012
-
Ingår i: Advances in ergonomics in manufacturing. - : CRC Press. - 9781439870402 ; , s. 399-408
-
Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- Increasing international competition between companies has put high focus on cost-cutting actions at all levels in companies and organizations. In product development there are many design requirements to meet and often tough project budgets to keep. Requirements that are considered not profitable will often be neglected, which often affects assembly ergonomics. The objective of this study is to demonstrate the relationship between ergonomics, assembly related quality errors and associated costs and develop a cost-beneficial assessment model. The results showed that ergonomics high risk issues had 5-8 times as many quality errors as low risk issues and the earlier risk issues were found the less were the action costs. A model for cost-benefit analyses was developed based on the obtained quality data.
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| 31. |
- Gopalakrishnan, Maheshwaran, 1987, et al.
(författare)
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Machine criticality assessment for productivity improvement: Smart maintenance decision support
- 2019
-
Ingår i: International Journal of Productivity and Performance Management. - : EMERALD GROUP PUBLISHING LTD. - 1741-0401 .- 1758-6658. ; 68:5, s. 858-878
-
Tidskriftsartikel (refereegranskat)abstract
- Purpose The purpose of this paper is to increase productivity through smart maintenance planning by including productivity as one of the objectives of the maintenance organization. Therefore, the goals of the paper are to investigate existing machine criticality assessment and identify components of the criticality assessment tool to increase productivity. Design/methodology/approach An embedded multiple case study research design was adopted in this paper. Six different cases were chosen from six different production sites operated by three multi-national manufacturing companies. Data collection was carried out in the form of interviews, focus groups and archival records. More than one source of data was collected in each of the cases. The cases included different production layouts such as machining, assembly and foundry, which ensured data variety. Findings The main finding of the paper is a deeper understanding of how manufacturing companies assess machine criticality and plan maintenance activities. The empirical findings showed that there is a lack of trust regarding existing criticality assessment tools. As a result, necessary changes within the maintenance organizations in order to increase productivity were identified. These are technological advancements, i.e. a dynamic and data-driven approach and organizational changes, i.e. approaching with a systems perspective when performing maintenance prioritization. Originality/value Machine criticality assessment studies are rare, especially empirical research. The originality of this paper lies in the empirical research conducted on smart maintenance planning for productivity improvement. In addition, identifying the components for machine criticality assessment is equally important for research and industries to efficient planning of maintenance activities.
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| 32. |
- Hane Hagström, Malin, 1971, et al.
(författare)
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Comparing the quality of documentation used in production equipment acquisitions and the impact on the performance of the acquired equipment – a pre study
- 2022
-
Ingår i: Proceedings of NordDesign 2022: How Product and Manufacturing Design Enable Sustainable Companies and Societies.
-
Konferensbidrag (refereegranskat)abstract
- There are often problems with design documentation, such as incomplete or missing and quality of input. A pre study within an engineering department for advanced machinery investigates the quality of production equipment acquisition documents used with the performance of the acquired equipment in terms of maintenance costs.The study shows indications that incomplete or missing input as well as the quality of the input could have an impact on the performance of the acquired machines and the project performance.
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| 33. |
- Hellman, Pasi, et al.
(författare)
-
Development of Quality Management Systems : How Have Disruptive Technological Innovations in Quality Management Affected Organizations?
- 2013
-
Ingår i: Quality Innovation Prosperity. - : Quality Innovation Prosperity. - 1335-1745 .- 1338-984X. ; 17:1, s. 104-119
-
Tidskriftsartikel (refereegranskat)abstract
- This research investigates the history of quality and development of quality management systems. History of quality is investigated from Hammurabi’s law all the way to today’s reigning quality initiatives including ISO, Six Sigma and Lean manufacturing. In the last chapters the current state of quality management is being examined. The foresight method is also opened up and examined. The Innovator’s dilemma concept, originally presented by Clayton Christensen, is used to analyse how quality management systems have been evolved in the last 100 years. Special emphasis is placed on the US manufacturing in the 1970s and 1980s. Based on the literature, the concept of Innovator’s dilemma and the fall of US manufacturing are merged. The result is a prime example that the Innovator’s Dilemma is a universal phenomenon. The industry leader is trying to maintain its position and do everything right but still it is destined to fail. The causes and effects are being discussed in later chapters.
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| 34. |
- Hermans, Johanna, et al.
(författare)
-
Quality management in the new product development : A PPAP approach
- 2013
-
Ingår i: Quality Innovation Prosperity. - : Quality Innovation Prosperity. - 1335-1745 .- 1338-984X. ; 17:2, s. 37-51
-
Tidskriftsartikel (refereegranskat)abstract
- The purpose of this paper is to test Production Part Approval Process (PPAP) as a tool to build quality into the new product and processes and ensure that it meets the customer expectations. Research method is qualitative method using so called case-study to study the suitability of PPAP as a tool for quality management by building quality right into the new product and process. The case studies have been made with three different kinds of companies. PPAP is suitable tool for quality management in NPD processes when taking into account many requirements about personnel, processes, documentation etc. The paper has some limitations such as limited sample size. The results are encouraging managers to use PPAP as a tool for managing their company’s product development processes, quality work and supply chain partnerships. The manner in which the stakeholders could use to facilitate a sense of partnerships or co-workers aiming the same goals rather than have a traditional customer-seller relationship was valued in this study.
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| 35. |
- Hjort af Ornäs, Viktor, 1976, et al.
(författare)
-
The spread of product development methodology: Exploring drivers and barriers in Swedish Industry
- 2014
-
Ingår i: 10th Biannual NordDesign Conference, NordDesign 2014, Espoo, Finland, 27-29 August. - 9781904670582 ; , s. 540-549
-
Konferensbidrag (refereegranskat)abstract
- The outcome of Design, Innovation and Product development research is often manifested asrecommendations in the form of methods, but these do not always find their way intoindustrial application. This paper elaborates on drivers and barriers for the spread of productdevelopment methodology based on 41 interviews with managers, designers, developers andknowledge brokers. Results indicate a range of motives for adopting methods including e.g.coordination of different actors, generation of documentation, methods serving as tools forvarious design tasks etc. However; the value of tools must be seen in relation to localconditions and practices. The spread of methods occurs between and within organisations andmay be actively supported while ideally “good tools spread themselves”. Participants call formethods to be scalable or malleable, guiding, informing and enabling without constraining orenforcing too rigid procedures.
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| 36. |
- Hoffenson, Steven, 1985, et al.
(författare)
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Tolerance Optimization of a Mobile Phone Considering Consumer Demand for Quality and Sustainability in China, Sweden, and the United States
- 2013
-
Ingår i: International Conference on Engineering Design. - : Design Research Society. ; 7 DS75-07, s. 467-476, s. 467-476
-
Tidskriftsartikel (refereegranskat)abstract
- Dimensional tolerances are chosen during the product development process to balance quality requirements against manufacturing costs. Designers typically judge how much variance should be allowed while still maintaining the perception of a high quality product or brand, but this is rarely based on an understanding of how consumers perceive that variance. Additionally, ecological sustainability priorities are often chosen without knowing how they will be received by consumers. This paper presents a survey-based technique for understanding how tolerance and pricing decisions influence a product developing firm’s profits, accounting for consumer perceptions of quality and environmental friendliness. A case study of a mobile phone design is explored, including variance propagation modeling, the design and administration of an online choice-based conjoint (CBC) survey, construction of consumer demand models, and profit maximization for the markets in three different countries. The results show a slight preference for high quality products compared with stronger preferences for other product attributes like low price, and the differences among the three markets are highlighted.
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| 37. |
- Jagtap, Santosh, et al.
(författare)
-
How design process for the Base of the Pyramid differs from that for the Top of the Pyramid
- 2014
-
Ingår i: Design Studies. - : Elsevier BV. - 0142-694X .- 1872-6909. ; 35:5, s. 527-558
-
Tidskriftsartikel (refereegranskat)abstract
- The base (BOP) and the top (TOP) of the world income pyramid represent the poor people and the people from developed countries, respectively. The design of products for the BOP is an important ingredient of the poverty reduction approach that combines business development with poverty alleviation. However, the current understanding of the design for the BOP is limited. This study, using a protocol analysis, compared design processes for the BOP and TOP markets. The results indicate the difference between the design processes for these markets in terms of the design strategy employed by the designers (i.e. problem driven, solution driven strategy), their requirements handling behaviour, and their information behaviour.
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| 38. |
- Kans, Mirka, 1971-, et al.
(författare)
-
Data Driven Maintenance : A Promising Way of Action for Future Industrial Services Management
- 2022
-
Ingår i: International Congress and Workshop on Industrial AI 2021. IAI 2021. - Cham : Springer. - 9783030936389 - 9783030936396 ; , s. 212-223, s. 212-223
-
Konferensbidrag (refereegranskat)abstract
- Maintenance and services of products as well as processes are pivotal for achieving high availability and avoiding catastrophic and costly failures. At the same time, maintenance is routinely performed more frequently than necessary, replacing possibly functional components, which has negative economic impact on the maintenance. New processes and products need to fulfil increased environmental demands, while customers put increasing demands on customization and coordination. Hence, improved maintenance processes possess very high potentials, economically as well as environmentally. The shifting demands on product development and production processes have led to the emergency of new digital solutions as well as new business models, such as integrated product-service offerings. Still, the general maintenance problem of how to perform the right service at the right time, taking available information and given limitations is valid.The project Future Industrial Services Management (FUSE) project was a step in a long-term effort for catalysing the evolution of maintenance and production in the current digital era. In this paper, several aspects of the general maintenance problem are discussed from a data driven perspective, spanning from technology solutions and organizational requirements to new business opportunities and how to create optimal maintenance plans. One of the main results of the project, in the form of a simulation tool for strategy selection, is also described.
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| 39. |
- Kurrewar, Harshad, et al.
(författare)
-
A Machine Learning Based Health Indicator Construction in Implementing Predictive Maintenance: A Real World Industrial Application from Manufacturing
- 2021
-
Ingår i: IFIP Advances in Information and Communication Technology. - Cham : Springer International Publishing. - 1868-4238 .- 1868-422X. ; 632 IFIP, s. 599-608
-
Konferensbidrag (refereegranskat)abstract
- Predictive maintenance (PdM) using Machine learning (ML) is a top-rated business case with respect to the availability of data and potential business value for future sustainability and competitiveness in the manufacturing industry. However, applying ML within actual industrial practice of PdM is a complex and challenging task due to high dimensionality and lack of labeled data. To cope with this challenge, this paper presents a systematic framework based on an unsupervised ML approach by aiming to construct health indicators, which has a crucial impact on making the data meaningful and usable for monitoring machine performance (health) in PdM applications. The results are presented by using real-world industrial data coming from a manufacturing company. In conclusion, the designed health indicators can be used to monitor machine performance over time and further be used in a supervised setting for the purpose of prognostic like remaining useful life estimation in implementing PdM in the industry.
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| 40. |
- Madrid, Julia, 1988, et al.
(författare)
-
Enabling reuse of inspection data to support robust design: a case in the aerospace industry
- 2016
-
Ingår i: Procedia CIRP. - : Elsevier BV. - 2212-8271. ; 43, s. 41-46
-
Konferensbidrag (refereegranskat)abstract
- The use and reuse of information and knowledge from manufacturing are crucial to secure the quality of the product throughout the product realization process. Robust design, variation simulation, virtual verification and root causes analysis are activities that require inspection data to ensure a robust process. In many industries, the level of inspection data reused is rather low. In this study, general barriers for reusing data concerning manufacturing processes have been identified in scientific literature and compared with specific barriers identified in a case study performed at an aerospace engine manufacturer. As an output of this comparison, barriers to the reuse of inspection data have been classified in three types: informational, technical, and organizational. In addition, the informational barriers are decomposed in four questions: Why, What, When and, How to measure. A support to answer those questions and overcome the informational barriers is proposed.
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| 41. |
- Michaelis, Marcel, 1982, et al.
(författare)
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Integrating Product and Manufacturing System Platforms - Exploring a Configurable System Approach
- 2010
-
Ingår i: Proceedings of the 11th International Design Conference DESIGN 2010. - 9789537738075 ; , s. 1605 - 1614
-
Konferensbidrag (refereegranskat)abstract
- While platform strategies are not the silver bullet to the development of products and manufacturing systems, they might at least yield some benefits. This paper explores a specific platform approach looking at products and manufacturing units as configurable systems. It reports an explorative empirical study identifying issues in integrated development. These issues are matched with the capability of the chosen approach to help solving them. Expressing information on appropriate levels of abstraction and illustrating interconnections of the systems are concluded to be two of the benefits.
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| 42. |
- Michaelis, Marcel, 1982, et al.
(författare)
-
Plattform-Based Development
- 2011
-
Ingår i: Entering the Tiger's Cave - Perspectives on Japanese and Swedisch Product Development. Dag Bergsjö (Ed.). ; , s. 31-35
-
Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- One of the main drivers for platform-based development and production is the possibility to combine customization with economies of scale. The reuse of common resources in multiple, customized design variants is one way of achieving this. However, the economic benefits may be easily lost. A relatively small design differentiation, for example, may lead to a relatively large number of parts having to be modified. More fruitful approaches that can support carry-over without major drawbacks include, for example, adopting a carefully planned development process or to reusing more abstract design knowledge.
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| 43. |
- Ramanujam, Harshavardhan, et al.
(författare)
-
Barriers and opportunities of implementing design thinking in product development process of a business to business company
- 2021
-
Ingår i: Proceedings of the Design Society: 23rd International Conference on Engineering Design, ICED 2021. - : Cambridge University Press (CUP). ; , s. 551-560
-
Konferensbidrag (refereegranskat)abstract
- Customer centricity is described as placing value creation for customers at the core of business decisions and organizational practices and is progressively regarded as a foundation of sustainable competitive advantage by companies. Hence in recent years, there is a shift from companies being product-centric to them adapting customer-centric practices as a practice to create balanced and sustainable businesses. Although there are several methods and processes that can help companies become customer-centric; Design Thinking (DT) is championed by many practitioners and academics alike as being effective in introducing customer-centricity in organizations. Despite being a highly researched topic in the last decade, the bulk of the research is focused on success stories or one-off cases of using design thinking in Business to Customer (B2C) environments. This paper is based on a qualitative study performed at a high-tech Swedish electronics company and focuses on highlighting the barriers and opportunities of adapting DT in Business to Business (B2B) companies with established product development processes. The barriers we identified can help companies to address the impediments and will make the DT implementation easier for companies
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| 44. |
- Sharma, Kirti, et al.
(författare)
-
New Wafer-Level Fabrication of Ultrathin Silicon Insertion Shuttles for Flexible Neural Implants
- 2023
-
Ingår i: Proceedings of the IEEE International Conference on Micro Electro Mechanical Systems (MEMS). - 1084-6999. ; 2023-January, s. 421-424
-
Konferensbidrag (refereegranskat)abstract
- This paper reports a novel, cost-effective process for the fabrication of ultrathin silicon (Si) shuttles applied as insertion tools for highly flexible polyimide (PI) neural implants. The process exploits the so-called etching before grinding (EBG) process established to realize Si-based neural probes of the Michigan style. In this study, EBG is combined for the first time with a subsequent deep reactive ion etch (DRIE) process applied on the wafer-level. The innovative approach allows to realize insertion shuttles with a base thickness > 50 μm using wafer grinding and to reliably thin down the slender shuttle shanks (width ≥ 35 μm) to thicknesses as small as 15 μm using DRIE. The backgrinding liquid wax applied during wafer grinding enables the safe release of the delicate shuttle structures from their carrier wafer using isopropanol. Flexible, 15-μm-thin neural probes made from PI are precisely aligned and temporarily bonded to the custom-designed insertion shuttles applying polyethylene glycol (PEG) and reliably deployed into cortical tissue.
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| 45. |
- Si, Shubin, et al.
(författare)
-
Benchmarking and developing the operational competitiveness of Chinese state-owned manufacturing enterprises in a global context
- 2010
-
Ingår i: International Journal of Innovation and Learning. - : InderScience Publishers. - 1471-8197 .- 1741-8089. ; 7:2, s. 202-222
-
Tidskriftsartikel (refereegranskat)abstract
- The purpose of this paper is to study the operational competitiveness of Chinese State-Owned Manufacturing Enterprises (CSOMEs) by analysing the case CSOME and comparing it with other global manufacturing companies in a Global Manufacturing Strategies (GMSS) database for developing innovation and learning. Analytical models are used to analyse the operational competitiveness of the case CSOME and its subsidiaries based on the weights of the multicriteria manufacturing strategies. The operational competitiveness development of its subsidiaries are applied to predict the future operational competitiveness of the case CSOME in a global context. The results show that quality is the most important competitive priority of the case CSOME and the case CSOME have some advantages when competing in a prospector group. The ranking and stability of the operational competitiveness of the case CSOME imply that: (1) the top CSOMEs have a strong operational competitiveness in the global context; however, they have some gaps compared to the top manufacturing enterprises in the world and (2) it will take a long time for the top CSOMEs to improve their operational competitiveness because of a huge organisational structure. Copyright © 2010 Inderscience Enterprises Ltd.
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| 46. |
- Stylidis, Kostas, 1978, et al.
(författare)
-
Addressing information asymmetry during design: Customer-centric approach to harmonization of car body split-lines
- 2021
-
Ingår i: Procedia CIRP. - : Elsevier BV. - 2212-8271. ; 104, s. 110-115
-
Konferensbidrag (refereegranskat)abstract
- Implementation of methods for perceived quality evaluation is an integral part of the automotive manufacturers' strategic development plans. The development of models for objective assessment of perceived quality is a very important task, addressing information asymmetry between designers and customers. This study seeks to understand how customers perceive and prioritize attributes associated with the car body split lines. We applied best-worst scaling methodology (BWS) to understand the importance of different shape design forms from a customer perspective. This approach was tested on 125 respondents. Our results indicate the improvement of engineering practices regarding complex product development solutions and their evaluation.
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| 47. |
- Stylidis, Kostas, 1978, et al.
(författare)
-
Perceived Quality Attributes Importance Ranking Methodology in the Automotive Industry: A Case Study on Geometry Appearance Attributes at CEVT
- 2022
-
Ingår i: Procedia CIRP. - : Elsevier BV. - 2212-8271. ; 107, s. 1559-1564
-
Konferensbidrag (refereegranskat)abstract
- Implementation of methods for perceived quality evaluation is an integral part of the automotive manufacturers' strategic development plans. The correct definition of perceived quality requirements is one of the significant factors influencing customer's purchase intention. This study seeks to understand how customers perceive and prioritize attributes that are associated with the geometrical and materials quality of a premium car market segment. We applied the Perceived Quality Attributes Importance Ranking (PQAIR) methodology to understand the importance of different perceived quality attributes form a customer perspective. Such an understanding can contribute to the effectiveness of the design processes in the early product development phases. This approach is tested on 144 respondents representing customer's target group and performed in collaboration with China Euro Vehicle Technology (CEVT) technical experts. Our results verify the rationality and feasibility of the applied method and indicate the improvement of engineering practices regarding complex product development.
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| 48. |
- Wagersten, Ola S, 1976, et al.
(författare)
-
Robust Design and Quality Assurance
- 2011
-
Ingår i: Entering the Tiger's Cave - Perspectives on Japanese and Swedisch Product Development. Dag Bergsjö (Ed.). ; , s. 37-44
-
Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- Robust design aims at reducing the effects of variation on a design, without eliminating the variation itself. It is a method of improving product quality with little or no additional manufacturing costs.Robust design methodology was pioneered by Japanese statistician Genichi Taguchi in the 1960s. His work is believed to have had a large influence on Japanese engineering tradition, and he is credited with playing a part in the Japanese industrial boom of the 1970s and 1980s. Today, robust design methodology is employed in companies all over the world, and extensive research has been conducted on the subject.
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| 49. |
- Berbyuk, Viktor, 1953
(författare)
-
MAGNETOELASTIC ELECTROMECHANICAL SYSTEMS FOR POWER HARVESTING FROM VIBRATION
- 2008
-
Ingår i: In Proceedings of The Second International Conference ”Modern Problems of Mechanics and Mathematics”, Lviv, May 26-29, 2008, Ukraine. ; 1, s. 46-47
-
Konferensbidrag (refereegranskat)abstract
- The paper addresses the problem of vibration-to-electric energy conversion using magnetostrictive materials. Theoretical and experimental results of the study of the magnetostrictive electric transducers (MET) for power harvesting from vibration are presented. Both simulations and experimental data have confirmed functionality of the designed MET using giant magnetostrictive material TERFENOL-D.
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| 50. |
- Berbyuk, Viktor, 1953, et al.
(författare)
-
Optimization problems of controlled multibody systems having spring-damper actuators
- 2000
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- To incorporate spring-damper actuators into the structure of multibody systems and to design optimally their parameters can give several advantages. In this paper, we tackle optimal control problems for multibody systems having spring-damper actuators. We study a fundamental question about optimal interaction between controlling stimuli generated by external drives and proportional-differential forces described by linear and angular stiffness and damping parameters. A range of questions are also addressed about the role of inherent dynamics, and how much multibody system should be governed by external drives and how much by the system's inherent dynamics. We are in particular investigating semi-passively actuated manipulator robots and bipedal walking mechanisms having spring-damper actuators. Results obtained can help to design simpler control systems of manipulator robots and legged autonomous mechanisms having less weight and energy consumption.
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