| 1. |
- Varl, Mitja, et al.
(författare)
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Customized Product Development Supported by Integrated Information
- 2021
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Ingår i: Journal of Industrial Information Integration. - : Elsevier BV. - 2452-414X.
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Tidskriftsartikel (refereegranskat)abstract
- Information systems are key enablers for the integration and reliable management of the product development process. Fast, robust, and cost-efficient product adaptation is especially important in one-of-a-kind production. This paper presents an implementation of information supported tools of the product development (PD) design process for large power transformers. One-of-a-kind production is specific, as each product must be customized, wherefore a robust design process well supported by information technologies (IT) plays a key role in creating a digital twin and the product's final value. Goal of this research was to develop the product information model and smart supporting tools for customization and integrate them into the design process. Based on a systematic analysis of the sample company, this paper proposes a model for the complete renewal of information systems and of working methodology, where reorganization is demonstrated in an increase of overall effectiveness. The results clearly show a considerable drop in engineering changes, increased productivity and improved business competitiveness. The proposed framework is generalized, which makes it directly applicable in similar business environments and thus helpful for establishing the best-practice guidelines for promoting competitiveness in one-of-a-kind PD processes.
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| 2. |
- Benedik, Blaž, et al.
(författare)
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Failure modes and life prediction model for high-speed bearings in a through-flow universal motor
- 2021
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Ingår i: Engineering Failure Analysis. - : Elsevier BV. - 1350-6307. ; , s. 2-21
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Tidskriftsartikel (refereegranskat)abstract
- The focus of this study was the empirical modelling of the high-speed bearings life and failure modes of a through-flow universal motor. An approach was used facilitating predictions of the life through-range of various conditions. The model estimates bearing life for the survival probability of 50% – L50. It influences parameters such as bearing temperature, speed factor, equivalent load, grease fill amount, type of oil, type of bearing cage, type of seals, tolerance class, and side of the motor, all of which are considered in the model. Initial empirical data consisted of 4,672 test populations, involving 38,021 vacuum cleaner motors. Strict filtering requirements of all the available test data resulted in 170 final populations, consisting of 1,385 tested and 638 failed bearings, which were used for building a Weibull database and for developing the models. The paper’s key contributions are the empirical models gained with multiple linear regression and the obtained database of tested bearings.
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| 3. |
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| 4. |
- Tavcar, Joze, et al.
(författare)
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MULTI-CRITERIA ASSESSMENT AND PROCESS SELECTION MODEL FOR ADDITIVE MANUFACTURING IN THE CONCEPTUAL PHASE OF DESIGN
- 2021
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Ingår i: Proceedings of the Design Society. - : Cambridge University Press (CUP). - 2732-527X. ; 1, s. 2197-2206
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Tidskriftsartikel (refereegranskat)abstract
- Additive manufacturing (AM), which was first applied for rapid prototyping, is now becoming a real option for small-batch production of final products. Further expansion of AM is closely correlated to production costs. AM can only become competitive to traditional manufacturing methods if a product is designed for AM already from the beginning as it is an expensive technology that should only be applied if it adds enough value to the product. The aim of this paper is to increase cost awareness in the conceptual design phase and to support product developers in doing AM cost estimation and process selection. The proposed model integrates design for AM and costs calculation. The input data to the process is preliminary design and design requirements. The main contribution of this paper is the multi-criteria AM function, which enables concurrent consideration of different technical and economical criteria. The multi-criteria AM function helps to compare how AM processing and product design parameters influence the product cost. The holistic overview of different options increases the solution space and enables product optimization in several iterations.
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| 5. |
- Zorko, Damijan, et al.
(författare)
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High cycle fatigue behaviour of autoclave-cured woven carbon fibre-reinforced polymer composite gears
- 2021
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Ingår i: Polymer Testing. - : Elsevier BV. - 0142-9418. ; 102
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Tidskriftsartikel (refereegranskat)abstract
- The high cycle fatigue behaviour of autoclave-cured carbon fibre-reinforced polymer (CFRP) composite gears is investigated. The CFRP gears were milled from a composite plate and tested in mesh with a steel drive gear under five torque loads ranging between 0.4 and 0.8 Nm in unlubricated conditions. A detailed gear damage analysis is conducted by employing scanning electron microscopy and high-resolution optical microscopy. Epoxy matrix microcracking is found to be the damage mechanism that leads to the final delamination failure. CFRP gears exhibited a significantly improved performance and a longer fatigue lifespan in comparison with the polymer and polymer composite gears.
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| 6. |
- Zorko, Damijan, et al.
(författare)
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Investigation of the durability and performance of autoclave-cured, woven carbon fiber-reinforced polymer composite gears in mesh with a steel pinion
- 2021
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Ingår i: Composite Structures. - : Elsevier BV. - 0263-8223. ; 273, s. 1-15
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Tidskriftsartikel (refereegranskat)abstract
- Wear mechanisms and failure modes were investigated for autoclave-cured, woven carbon fiber-reinforced polymer (CFRP) composite gears in a mesh with a surface-hardened, 42CrMo4 steel pinion. The reference gears (m = 1 mm, b = 2 mm, z = 20) were tested at torque levels ranging from 0.4 Nm to 0.8 Nm. The temperature was monitored with a thermographic camera, while the gear damage and wear volume were analyzed and measured every 2 million cycles. The relationship between wear volume against the number of cycles was obtained. Scanning electron microscopy revealed two- and three-body abrasive, oxidative, and fatigue wear, and progressive de-laminations during the sliding and rolling of the gears. The CFRP composite gears exhibited higher wear resistance than the polymer ones.
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| 7. |
- Zorko, Damijan, et al.
(författare)
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Tooth bending strength of gears with a progressive curved path of contact
- 2021
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Ingår i: Journal of Computational Design and Engineering. - : Oxford University Press (OUP). - 2288-5048. ; 8:4, s. 1037-1058
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Tidskriftsartikel (refereegranskat)abstract
- The article presents a comprehensive study on the tooth bending strength of spur gears with a progressive curved path of contact, or so-called S-gears. Systematic gear meshing simulations were conducted to study the effects of S-gear geometry parameters on tooth bending strength. Different S-gear geometries were analysed in a systematically organized manner, and a comparison was made against a standard 20° pressure angle involute shape. Furthermore, different material combinations, e.g. polymer/polymer, steel/polymer, and steel/steel, of both drive and driven gear were analysed within a meaningful range of loads. The gear profile shape, material combination of the drive and the driven gear, and the transmitted load were found as the main parameters affecting gear tooth bending stress. Complex, non-linear relations between the recognized effects and the corresponding root stress were observed. Based on the numerical results, a shape factor, which considers the above-mentioned effects, was introduced, and a model for root strength control of S-gears was proposed and verified employing the finite element method (FEM).
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| 8. |
- Zorko, Damijan, et al.
(författare)
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TOWARDS AGILE PRODUCT DEVELOPMENT – AN EMPIRICAL STUDY ON AN E-BIKE DRIVE
- 2021
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Ingår i: Proceedings of the Design Society. - : Cambridge University Press (CUP). - 2732-527X. ; 1, s. 3209-3218
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Tidskriftsartikel (refereegranskat)abstract
- Today's rapidly evolving and changing market dictates constant changes in design requirements during the development process of a product. If development teams are unable or unwilling to adapt to these changes, this will ultimately lead to an uncompetitive product. How the change in requirements will affect the development process depends on the complexity of the product and the development phase in which the change in requirements occurs. The principles of Agility and the methods that follow these principles help in the successful introduction of changes in the product development process. The paper provides guidelines for the development of complex physical products taking into account the principles of Agility. The guidelines were set based on a critical review of the e-bike drive development process.
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