Abstract

A double-tapered rectangular tube with diaphragms (DTRTD) for energy absorbance in railway vehicles is proposed. The mean crushing force (MCF) of DTRTD was derived. The code LS-DYNA3D (971) was used to build a finite element model, validated using a quasi-static test. The experiment results and numerical simulation indicate the accuracy of the theoretical prediction for the MCF of DTRTD and the regularity and stability of the collapse pattern of this energy-absorbing structure (EAS). To explore the effects of the thickness of different EAS parts on the crashworthiness indexes and obtain the optimal designs, the design of experiment (DOE) and a surrogate model were employed for a parameter study and multi-objective optimisation (MOO). The specific energy absorption (SEA) and crush force efficiency (CFE) cannot reach the optimal values concurrently. Nonetheless, all designs from the Pareto front of MOO significantly improve the crashworthiness of EAS because of the larger SEA and CFE.

摘要

提出了一种用于铁路车辆能量吸收的双锥度带隔膜矩形管（DTRTD）。推导出 DTRTD 的平均压碎力 (MCF)。代码 LS-DYNA3D (971) 用于构建有限元模型，并使用准静态测试进行验证。实验结果和数值模拟表明了DTRTD的MCF理论预测的准确性以及该吸能结构（EAS）倒塌模式的规律性和稳定性。为了探索不同EAS部件厚度对耐撞性指标的影响并获得最佳设计，采用实验设计（DOE）和替代模型进行参数研究和多目标优化（MOO）。比能量吸收（SEA）和压碎力效率（CFE）不能同时达到最佳值。