基于轴头垂向加速度响应的车轮载荷推断方法研究

THE INFERENCE METHOD OF WHEEL LOAD BASED ON THE ACCELERATION OF AXLE HEAD

介绍一种可替代六分力测量车轮垂向力载荷的测量新方法。通过对某轿车车轮的轴头垂向加速度和车轮垂向力时域信号进行分析,建立了轴头与车轮之间的线性模型。利用实时信号转化法和数理统计的方法对采集得到的车轮垂向载荷和轴头垂向加速度信号的实时数据进行统计分析,得到了在试车场道路下轴头垂向加速度和车轮垂向力信号之间的统计推断模型。以某车型轿车车轮进行验证试验,利用四立柱道路模拟试验台对该轿车车轮垂向载荷和轴头垂向加速度进行标定,并且进行了试车场道路载荷谱采集。通过对比采集到的车轮垂向力载荷谱与推断的车轮垂向力载荷谱,验证了该模型的有效性,研究结果表明:基于轴头加速度响应的车轮载荷估计方法切实可行。

A new load spectrum measuring method which can instead of the six-component measuring wheel was carried out in this paper. Through analysis the signal time-domain, a linear model between the axle head and the wheel was established. By using real-time signal transformation and mathematical statistics method, the collected load spectrum of vertical wheel load and the vertical acceleration of the axle head, an inference model were analyzed and discussed between the axle head and the wheel. The analysis method was validated by a reality car test. The wheel vertical load and axle head vertical acceleration calibrated was conducted by four pillars road simulation test bed, and the skid pad load spectrum was acquisitioned. Compared with the load spectrum of collected wheel vertical force and inference load spectrum of wheel vertical force, the correctness of model was verified. Finally, the results indicated that this inference method can replace the six-component measuring wheel for road load spectrum acquisition.