基于最小二乘法的跑道摩擦系数测试方法

Runway Friction Coefficient Test Process Based on Recursive Least-Squares method

介绍了车载跑道摩擦系数测试设备的测量原理和嵌入式PC控制系统组成,分析了测量过程中跑道摩擦系数测量载体—测量轮所受垂直正压力和水平摩擦力产生波动的影响因素。为消除水平力、垂直力波动对跑道摩擦系数测量结果带来的误差,采用了渐消记忆递推最小二乘数据处理方法。结果表明该方法可消除测量过程中大部分中高频干扰信号,使单次测量数据精度提高,保证摩擦系数测量结果的准确性。

The measurement theory and control system composition that based on embedded PC of runway friction coefficient test vehicle were presented, and the influence factors which would bring fluctuation to the horizontal and vertical force of the special test wheel during the test procedure were also discussed. In order to eliminate the fluctuation error of the runway friction coefficient that was brought by the force fluctuation, the recursive least-squares method was applied for the test data processing. It is proved that this method can eliminate the major error which was brought by medium and high frequency, at the same time it can improve the accuracy of the runway friction coefficient for single test.