车身疲劳载荷谱的位移反求法

Displacement Back-calculation of Body Fatigue Loading Spectrum

提出运用轮心位移反求法求取车身载荷谱的方法.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;建立精度满足要求的整车多体动力学模型;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.

A procedure of the spindle displacement back- calculation to acquire body loading spectrum is presented through a case study of a light-duty bus. First, road loads in the proving ground is collected by arranging some transducers. Then, the multi-body dynamic simulation model with a satisfactory accuracy is established. Finally, based on the above two factors, virtual iteration is applied to cascade body loads from the wheel hubs. The conclusion can be drawn that the simulation signals obtained from the proposed method agree well with the experimental data, and thus the load information extracted from the body interface points can be utilized to evaluate the fatigue lifetime.