基于实测载荷谱和仿真载荷谱的底盘疲劳分析及对比

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摘要由于实测载荷谱存在应用范围小，且需要改制骡车进行试验采集，成本较高的特点，从而促进了基于虚拟路面的仿真载荷谱获取技术的发展，仿真载荷谱既即不受骡车限制，且成本也低。本文以实测载荷谱为基准，验证了基于3D虚拟路面的仿真载荷谱的精确性和实用性。首先建立某试验场共振路2的3D虚拟路面和某车型整车多体动力学模型，获得仿真载荷谱。其次将六分力传感器实测的载荷谱与仿真载荷谱进行时域、频域和损伤的对比，验证了仿真载荷谱的精确性。最后对底盘部件疲劳仿真分析下的损伤进行对比，发现两种载荷谱下的疲劳损伤分布趋势完全一致，摆臂与转向节的最大损伤比值分别为1.79和2.43，验证了3D虚拟路面和整车多体动力学模型构建方法的正确性，以及基于3D虚拟路面提取的疲劳载荷谱的工程实用性。

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关键词 ：实测载荷谱, 仿真载荷谱, 3D虚拟路面重构, 损伤对比

Abstract：

The measured load spectrum is always got by a mule car. The cost is high and applicability is limited. Promoting the development of simulation load spectrum acquisition technology by virtual road is thus meaningful. In this paper, based on the measured road load spectrum, the accuracy and practicability of simulated road load spectrum based on 3D virtual road were verified. First, a vehicle multibody dynamics model and 3D virtual road of resonance two for proving testing ground were established, then the simulated road load spectrum was obtained by dynamic simulation. Secondly, the measured road load spectrum from wheel force transducer and the simulated road load spectrum were compared in time domain and frequency domain. The accuracy of the simulated road load spectrum was verified. Finally, compared the chassis fatigue damage from simulation analysis, it was found that the fatigue damage distribution has exactly the same trend, the maximum damage ratios for lower control arm and knuckle are 1.79 and 2.43, respectively. To verify the correctness of the construction method for the 3D virtual road and vehicle multibody dynamics model, the practicability of fatigue load spectrum based on 3D virtual road was demonstrated.

Key words： Measured road load spectrum Simulated road load spectrum 3D virtual road modeling Damage comparison

收稿日期: 2016-11-14 出版日期: 2018-06-15

引用本文:

荣兵肖攀周建文. 基于实测载荷谱和仿真载荷谱的底盘疲劳分析及对比[J]. 振动与冲击, 2018, 37(12): 179-186.
RONG Bing,XIAO Pan,ZHOU Jianwen. A fatigue comparative analysis of chassis based on simulated road load spectrum and measured road load spectrum. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(12): 179-186.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2018/V37/I12/179

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