一种六维轮力传感器标定分析

Calibration and analysis of six-dimentional wheel force sensor

针对汽车六维车轮力传感器数值解耦精度不高的问题,设计了标定台架,并对一种新研制的六维WFS进行了标定和解耦,以评估该传感器的性能并研究和完善高精度的解耦方法。讨论和分析了六维WFS的测量原理和解耦理论,通过多向组合加载的方式,获得了传感器各通道对多维耦合力的响应,利用最小二乘法解耦得到了传感器的耦合系数矩阵;并对耦合系数矩阵和耦合率矩阵的特征进行了讨论。研究结果表明,采用多向组合加载结合最小二乘法进行解耦,解决了试验中难以精确施加纯单向力或力矩的困难,能使六维WFS具有更高的测量精度。

Aiming at the low precision of numerical decoupling of the six dimensional WFS（ Wheel Force Sensor）,by designing a calibration mechanical system,a WFS was calibrated and decoupled to evaluate the performance and find a high accuracy decoupling method. The measuring principle of a six dimensional WFS and how to decouple it were discussed. Through the way of multidirectional combination load and using least squares method（ LSM）,the coupling coefficient matrix（ CCM） of the sensor was obtained,and the characteristics of the CCM and coupling rate were discussed. The results indicate that the decoupling by multidirectional combination load and LSM can solve the difficulty of load a single force,and make the measuring accuracy of WFS higher.