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M. Carvalho¹, J. Milho^2,3 and J. Ambrósio⁴

¹Research and Development Unit for Mechanical & Industrial Engineering, Faculty of Science and Technology, Universidade Nova de Lisboa, Portugal
²Institute of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
³Instituto Superior de Engenharia de Lisboa, Instituto Politécnico de Lisboa, Lisboa, Portugal
⁴Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal

Keywords: injury biomechanics, railway crashworthiness, simulation, optimisation.

Summary

The study presented, in this paper, concerns an optimisation procedure for the identification of coach interior layouts during crashes of railway vehicles, focusing on the protection of the occupants. A railway accident is described by the primary collision, in which the vehicle is subjected to a sudden deceleration causing the unrestrained occupants to continue their original motion until the secondary collision, in which the railway passengers come into contact with some part of the vehicle or with other occupants. Hence, the seating layout, which plays a major role in the process, is investigated with the objective of identifying what are the best design options. The objective of the optimal problem, defined for the improvement of the seating layout, is the minimization of the injuries as represented by all relevant injury criteria identified for railway passengers. The optimal design technique suggested here, based on the use of a surrogate response surface function instead of using directly the dynamic analysis, ensures that a wider range of the design space is searched for the optimal design. The only real costs involved in the methodology presented reside on the number of analyses with the detailed model required to identify the quadratic surface parameters, this number always being smaller than the number of iterations taken in any optimisation process. The results show that an optimal design of the interior seating layout is obtained with relevant decreases of the injury indices and it is also observed that the difference between the injury indices evaluated using the surrogate model are on average less than five percent different from those calculated with the realistic detailed model.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 110 PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 313 Identification of the Optimal Railway Vehicle Interior Model for Passive Safety Improvement M. Carvalho¹, J. Milho^2,3 and J. Ambrósio⁴ ¹Research and Development Unit for Mechanical & Industrial Engineering, Faculty of Science and Technology, Universidade Nova de Lisboa, Portugal ²Institute of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal ³Instituto Superior de Engenharia de Lisboa, Instituto Politécnico de Lisboa, Lisboa, Portugal ⁴Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal doi:10.4203/ccp.110.313 purchase the full-text of this paper Full Bibliographic Reference for this paper , "Identification of the Optimal Railway Vehicle Interior Model for Passive Safety Improvement", in J. Pombo, (Editor), "Proceedings of the Third International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 313, 2016. doi:10.4203/ccp.110.313 Keywords: injury biomechanics, railway crashworthiness, simulation, optimisation. Summary The study presented, in this paper, concerns an optimisation procedure for the identification of coach interior layouts during crashes of railway vehicles, focusing on the protection of the occupants. A railway accident is described by the primary collision, in which the vehicle is subjected to a sudden deceleration causing the unrestrained occupants to continue their original motion until the secondary collision, in which the railway passengers come into contact with some part of the vehicle or with other occupants. Hence, the seating layout, which plays a major role in the process, is investigated with the objective of identifying what are the best design options. The objective of the optimal problem, defined for the improvement of the seating layout, is the minimization of the injuries as represented by all relevant injury criteria identified for railway passengers. The optimal design technique suggested here, based on the use of a surrogate response surface function instead of using directly the dynamic analysis, ensures that a wider range of the design space is searched for the optimal design. The only real costs involved in the methodology presented reside on the number of analyses with the detailed model required to identify the quadratic surface parameters, this number always being smaller than the number of iterations taken in any optimisation process. The results show that an optimal design of the interior seating layout is obtained with relevant decreases of the injury indices and it is also observed that the difference between the injury indices evaluated using the surrogate model are on average less than five percent different from those calculated with the realistic detailed model. purchase the full-text of this paper (price £22) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £85 +P&P)
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