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- Carlqvist, Per, et al.
(författare)
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Benchmark of High Level Programming : Pilot Case Vibration Control
- 2009
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Ingår i: Proceedings of the 9th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2009. - 9780955308260 ; , s. 361-364
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Konferensbidrag (refereegranskat)abstract
- The advancement of technology of laser pattern generators needs to meet demands of the rapid product development pace in the display and semiconductor markets. A hypothesis is that efficiency in the development process of complex systems can be improved by introducing a higher level programming approach. This will make a model and simulation based development (MBD) strategy more easy to adapt leading to 1) higher technical performance at shorter development time from idea to product introduction phase, 2) lower cost of goods, 3) shorter production-, installations- & upgrade time and 4) possibility of very efficient field support & service, etc. The success of an MBD approach is dependent on the simulation software capability to express the behavior of a real system. Consequently, as a first step towards an MBD approach, the investigation covers a pilot-study where results from simulations are compared to an existing controlled system.
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| 2. |
- Carlqvist, Per, et al.
(författare)
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Optimization of Active Vibration Control of a Laser Pattern Generator in Micro Lithography
- 2010
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Ingår i: Proceedings of the 10th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2010. - : euspen. - 9780955308284 ; , s. 491-494
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Konferensbidrag (refereegranskat)abstract
- The extreme precision requirements in semiconductor manufacturing drive the need for an active vibration isolation system in a laser pattern generator. Optimization has been performed and evaluated in a model using a high level programming tool [1]. The areas of optimization were 1) Decoupling strategies for decentralized control and 2) Improved feed forward control. Only a limited description of the model itself is given here. More about the model is presented in [2] and [3].
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| 3. |
- During, Carl
(författare)
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Mechatronic systems techniques for real-time optical measurement systems
- 2014
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Ingår i: Electromechanical Systems: Mechatronic Systems, Techniques and Applications Volume Four. - : CRC Press. ; , s. 71-123
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- The development of optical devices, such as the semiconductor laser, the optical fiber, and the CCD Cameras have recently produced a variety of different equipment for industries, offices and homes, which are based on optic, mechanic, electronic and computer sciences. These systems are sometimes referred to as opto-mechatronic systems [1,2], and can for example be categorized in real-time optical information systems and real-time optical measurement systems. Information systems, such as hand held laser scanners used for storing information in a computer. Measurement systems, where the information of the measurements produces a system response.2A system can for example be symbolized by an autonomous mobile robot, using a fiber optic gyroscope together with pulsed laser diodes range finders based on time of flight measurements, for navigation control [3]. There are also combinations of these two categories such as optical disc storage systems [4,5]. In this case the measurement of the reflected light gives the stored data of the disc as well as information to keep the laser beam on the track of the disc. Focusing on real-time optical measurement systems, this chapter will discuss aspects of mechatronic systems techniques.
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| 7. |
- Kenda, Martin, et al.
(författare)
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Regional Brain Net Water Uptake in Computed Tomography after Cardiac Arrest – A Novel Biomarker for Neuroprognostication
- 2024
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Ingår i: Resuscitation. - 0300-9572. ; 200
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Tidskriftsartikel (refereegranskat)abstract
- Background: Selective water uptake by neurons and glial cells and subsequent brain tissue oedema are key pathophysiological processes of hypoxic-ischemic encephalopathy (HIE) after cardiac arrest (CA). Although brain computed tomography (CT) is widely used to assess the severity of HIE, changes of brain radiodensity over time have not been investigated. These could be used to quantify regional brain net water uptake (NWU), a potential prognostic biomarker. Methods: We conducted an observational prognostic accuracy study including a derivation (single center cardiac arrest registry) and a validation (international multicenter TTM2 trial) cohort. Early (<6 h) and follow-up (>24 h) head CTs of CA patients were used to determine regional NWU for grey and white matter regions after co-registration with a brain atlas. Neurological outcome was dichotomized as good versus poor using the Cerebral Performance Category Scale (CPC) in the derivation cohort and Modified Rankin Scale (mRS) in the validation cohort. Results: We included 115 patients (81 derivation, 34 validation) with out-of-hospital (OHCA) and in-hospital cardiac arrest (IHCA). Regional brain water content remained unchanged in patients with good outcome. In patients with poor neurological outcome, we found considerable regional water uptake with the strongest effect in the basal ganglia. NWU >8% in the putamen and caudate nucleus predicted poor outcome with 100% specificity (95%-CI: 86–100%) and 43% (moderate) sensitivity (95%-CI: 31–56%). Conclusion: This pilot study indicates that NWU derived from serial head CTs is a promising novel biomarker for outcome prediction after CA. NWU >8% in basal ganglia grey matter regions predicted poor outcome while absence of NWU indicated good outcome. NWU and follow-up CTs should be investigated in larger, prospective trials with standardized CT acquisition protocols.
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| 8. |
- Morkeberg Torry-Smith, Jonas, et al.
(författare)
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Challenges in Designing Mechatronic Systems
- 2013
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Ingår i: Journal of mechanical design (1990). - : ASME International. - 1050-0472 .- 1528-9001. ; 135:1, s. 011005-
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Tidskriftsartikel (refereegranskat)abstract
- Development of mechatronic products is traditionally carried out by several design experts from different design domains. Performing development of mechatronic products is thus greatly challenging. In order to tackle this, the critical challenges in mechatronics have to be well understood and well supported through applicable methods and tools. This paper aims at identifying the major challenges, by conducting a systematic and thorough survey of the most relevant research work in mechatronic design. Solutions proposed in literature are assessed and illustrated through a case study in order to investigate if the challenges can be handled appropriately by the methods, tools, and mindsets suggested by the mechatronic community. Using a real-world mechatronics case, the paper identifies the areas where further research is required, by showing a clear connection between the actual problems faced during the design task and the nature of the solutions currently available. From the results obtained from this research, one can conclude that although various attempts have been developed to support conceptual design of mechatronics, these attempts are still not sufficient to help in assessing the consequences of selecting between alternative conceptual solutions across multiple domains. We believe that a common language is essential in developing mechatronics, and should be evaluated based on: its capability to represent the desired views effectively, its potential to be understood by engineers from the various domains, and its effect on the efficiency of the development process.
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| 9. |
- Qamar, Ahsan, et al.
(författare)
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A Mechatronic Design Infrastructure Integrating Heterogeneous Models
- 2011
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Ingår i: 2011 IEEE International Conference on Mechatronics (ICM 2011). - Istanbul, Turkey : IEEE. - 9781612849836 ; , s. 212-217
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Konferensbidrag (refereegranskat)abstract
- Mechatronic system design is contemplated extensivelythrough model-based approaches. To reflect the multidomainintegration inside a mechatronic system during the designprocess, integration approaches targeting heterogeneous modelsare essential. An infrastructure supporting the design of multidomainsystems is presented. The dependencies between thedomain-specific models are managed by utilizing SysML as acommon system modeling language between those models. Amodel integration framework supports model transformationsbetween the system-model and the domain-specific models byutilizing Eclipse Modeling Framework. Structural and parametertype dependencies between different domain-models are handledto provide consistency between different views. This provides anability to traverse between different views of the system, as wellas maintaining consistency between those views. A case study on arobot system is presented to explain the integration of mechanicaldesign model in Solid Edge, and dynamic analysis model inSimulink/SimMechanics through a SysML system model, all underthe proposed design infrastructure. The approach is scalabletowards other modeling formalisms by building new relationsthrough the SysML model. This will support: co-evolution ofdomain-specific models, a better design of multi-domain systems,reduction in modeling in-consistencies, and a reduction in designtime.
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| 10. |
- Qamar, Ahsan, et al.
(författare)
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Dependency Modeling and Model Management in Mechatronic Design
- 2012
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Ingår i: Journal of Computing and Information Science in Engineering. - ASME : ASME International. - 1530-9827 .- 1944-7078. ; 12:4, s. 041009-
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Tidskriftsartikel (refereegranskat)abstract
- Mechatronic design is traditionally supported through domain-specific design activities throughout the product development process. The partitioning into domain-specific problems leads to a situation where product properties influence each other, hence giving rise to dependencies. These dependencies play a key role in the prediction of properties and, as a result, in the decision-making process. The important question is how to manage the dependencies for efficient and effective decision making? The aim of this paper is threefold. First, we investigate the nature of dependencies and study how to model them. The paper proposes appropriate terminology taking into account the synthesis and analysis nature of both the properties and the dependencies. This terminology will be the core of the new dependency modeling language. The concepts related to dependency modeling are then illustrated through a simple robot design example, where the creation and importance of a dependency model are explained. Second, we study practical approaches for consistency management and model management in the presence of dependencies. Six levels-of-detail in modeling dependencies are presented; emphasizing that modeling at a higher level-of-detail ensures that more inconsistencies are avoided. Available languages such as OMG SysML™ are evaluated for a possible creation of the dependency models leading toward executable dependency networks. However, at present, SysML does not provide sufficiently rich language constructs to model dependencies. Third, we compare our dependency modeling approach to other state-of-the-art approaches such as dependency modeling with a design structure matrix (DSM), and highlight the benefits of the terminology proposed in this paper. We aim to convince the reader that there is substantial value in modeling dependencies explicitly, especially to avoid inconsistencies, which is not the current state of practice. However, an overall value from dependency modeling can only be obtained if the cost of creating the dependency model is reasonable. Issues such as human interaction/effort and model management through product lifecycle management (PLM) are discussed.
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