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首页> 外文会议>Proceedings of the Fifteenth international conference on civil, structural and environmental engineering computing >Railway Crashworthiness Optimization with Multibody Systems and Analytical Sensitivities
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Railway Crashworthiness Optimization with Multibody Systems and Analytical Sensitivities

机译：多体系统和分析灵敏度的铁路耐撞性优化

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摘要

The railway industry requires numerical simulation tools capable of describing the dynamic response of train cars during general crash scenarios and also optimization procedures that can be used efficiently in the earlier design stages of crashworthiness components. In this paper, a computational optimization tool is proposed for the design of train crashworthy components, based on multibody systems and analytical sensitivities. The multibody methodology is used to describe trains as dynamic systems in which the structures of the trains that deform during the train crash are described using a plastic-hinge approach. Optimization algorithms are implemented using analytic sensitivities based on direct differentiation through the computer program ADIFOR (Automatic Differentiation of Fortran) and using numerical sensitivities based on finite differences. The optimization tool is applied to the design of an experimental train crash test to appraise the energy absorption performance of the buffers located in the cars extremities and acting between cars in the same rake. The corresponding optimal solution obtained and the results are discussed in face of the robustness of the overall methodology, particularly, in what the use of analytical sensitivities versus numerical sensitivities are concerned in a practical framework of an industrial application to the design of train crashworthy components.
机译：铁路行业需要数值模拟工具，这些工具必须能够描述火车在一般碰撞情况下的动态响应，还需要能够在防撞组件的早期设计阶段有效使用的优化程序。在本文中，基于多体系统和分析灵敏度，提出了一种计算优化工具，用于设计列车防撞部件。使用多体方法将火车描述为动态系统，其中使用塑性铰链方法描述在火车碰撞期间变形的火车的结构。优化算法是通过基于计算机程序ADIFOR（Fortran自动求差）的直接微分的解析灵敏度和基于有限差分的数值灵敏度来实现的。该优化工具用于实验性火车碰撞试验的设计，以评估位于轿厢末端并作用于同一耙子的轿厢之间的缓冲器的能量吸收性能。面对整个方法的鲁棒性，讨论了获得的相应最佳解决方案和结果，特别是在工业应用的实用框架中对列车耐撞部件的设计中，分析灵敏度与数值灵敏度之间的关系受到关注。

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