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本研究的目的是开发在各种应力、工况和几何制约的条件下,使用声学工程判断和应用现代的优化技术,对66ft(20.1m)长的平车进行最小重量的设计。根据美国铁路协会(AAR)的设计规范,研究了五种载荷情况。为了将中梁的重量减到最小,对于序贯无约束极小化方法,采用弗莱彻·鲍威尔(Fletsh-Powell)算法。对结构构件、变截面元件和梁板相交之间的中立轴线的偏移,均包含在平车模型的有限单元分析之中。考虑了附加载荷情况对一些断面和材料作了更换,因而进一步降低了重量。
The purpose of this study was to develop a minimum weight design for a 66ft (20.1m) long flat car using acoustic engineering to determine and apply modern optimization techniques under a variety of stress, condition and geometry constraints. Five load cases were studied according to the design rules of the American Railway Association (AAR). In order to minimize the weight of the mid-beam, a Fletsh-Powell algorithm is used for sequential unconstrained minimization methods. The offset of the neutral axis between the intersection of the structural member, the variable cross-section element and the beam is included in the finite element analysis of the flat car model. Taking into account the additional load conditions for some sections and materials replaced, thus further reducing the weight.