基于LS-DYNA的安全带固定点强度试验仿真精度研究

SIMULATION ACCURACY STUDY ON THE STRENGTH TEST OF SEATBELTS ANCHORAGES BASED ON LS-DYNA

针对安全带固定点强度试验这一准静态过程,通过对比分析弹性动力学中中心差分法(显式)和Newmark法(隐式)的优劣,选用LS-DYNA的显式求解器计算国产某出口澳大利亚车型座椅安全带。通过研究改变计算时间和加载函数两项关键参数,并选取一定的评价指标,逐步提高仿真结果与实车试验的吻合度。方法可推广到其他准静态强度分析中,为提高仿真准确度提供了较好的思路。

As to the strength test of seatbelts anchorages which is a quasi-static problem,through comparative analysis of central difference method（ explicit integration） and Newmark method（ implicit integration） in elastodynamics,this paper used explicit solution method in LS-DYNA to compute the seatbelts FE model of domestic minibuses exported to Australia. Lots of studies were carried out herein on two key parameters： calculation time and load curve,and certain evaluation indexes were selected,to gradually improve simulation results consistency with the real test. The methed can be extended to other quasi-static strength analysis problems and gives some useful conclusions on improving simulation accuracy.