一种加速多体动力学模型虚拟迭代的载荷谱编制方法

摘要/Abstract

摘要： 为加速多体动力学模型的虚拟迭代，提出了一种能够完整保留长里程路面载荷谱损伤值、幅值特征和频率特征的编制方法，采用路面时域信号分割以及路面片段组合优化等手段，使得比利时路单次循环路面里程由2.61 km缩减至1.49 km，生成了用于虚拟迭代的加速谱。对比了下摆臂及转向节分别在比利时路原始谱和加速谱作用下的疲劳损伤，结果显示缩减前后损伤分布一致，摆臂和转向节的最大损伤比值分别为1.081和1.205，表明了加速谱能够替代原始谱。运用该方法对耐久规范中的越野路及山路长里程路面进行了同样的里程缩减处理，并对摆臂和转向节进行了疲劳分析预测，分析结果显示其寿命能够满足疲劳性能目标，并通过了实车道路耐久验证。所提出的载荷谱编制方法为加速多体动力学模型的虚拟迭代提供了一种解决途径。

关键词: 多体动力学, 虚拟迭代, 时域信号分割, 里程缩减, 疲劳损伤

Abstract: In order to accelerate vehicle dynamics model virtual iteration, a load spectrum development methodology which could reserve long milestone load spectrum damage, amplitude characteristics and frequency characteristics was proposed.The milestone of Belgian block single loop was reduced to 1.49 km from original 2.61 km with applications of road time domain segmentation and combinatorial optimization, an accelerated spectrum used for dynamics model virtual iteration was created.The fatigue damage of low control arm and knuckle was predicated under original spectrum and accelerated spectrum of Belgian block.Analysis results show that the damage distribution remains the same before and after the reduction, the maximum damage ratios for low control arm and knuckle are 1.081 and 1.205 respectively, which demonstrate that the accelerated spectrum may replace the original spectrum.The off-road and mountain road in durability test procedure was reduced by the same reduction methodology.The fatigue life of low control arm and knuckle was predicted.Analysis results show that the fatigue life may satisfy the target, and the vehicle completes the durability validation of proving ground successfully.The load spectrum development methodology herein provides a way to accelerate vehicle dynamics model virtual iteration.

Key words: multi-body dynamics, virtual iteration, time domain segmentation, milestone reduction, fatigue damage

中图分类号:

U463

葛文韬;黄晖;刘洲;邱星;贾慧芳. 一种加速多体动力学模型虚拟迭代的载荷谱编制方法[J]. 中国机械工程.

GE Wentao;HUANG Hui;LIU Zhou;QIU Xing;JIA Huifang. Load Spectrum Development Methodology for Accelerating Dynamics Model Virtual Iteration[J]. China Mechanical Engineering.

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