车身疲劳载荷谱的位移反求法

Displacement Back-calculation of Body Fatigue Loading Spectrum

摘要:

为了获取准确的用于耐久性分析的车身载荷谱，提出轮心位移反求法求取车身载荷的方法。首先，通过布置合适的传感器，采集试车场强化路面的道路载荷谱信号；然后，建立精度满足要求的整车多体动力学模型；最后，基于采集的道路载荷谱和多体模型进行虚拟迭代，并进行车身载荷谱的分解。结果表明，迭代后仿真信号与试验值的一致性好，随后提取的车身载荷谱具有较高的可靠性，可用于车身疲劳寿命预测。

Abstract:

In order to obtain body loading spectrum of high accuracy in fatigue prediction, a procedure of the spindle displacement back-calculation to acquire body loading spectrum is presented, with a case study of a light-duty bus. Firstly, road loads in the providing ground is collected by arrangement of some sensors. Secondly, the multi-body dynamic simulation model is established with a satisfied accuracy. Finally, virtual iteration is introduced in theory, and applied to cascade body loads from the wheel hubs. The conclusion can be drawn that the simulation signals obtained from the proposed method accords with the experimental data, and thus the extract load information of the body interface points can be utilized to evaluate the fatigue life time.