基于载荷分布预分析的应变传感器布置

The Layout of Strain Sensor Based on the Preanalysis Load Distribution

采用载荷分布预分析技术,对某MPV汽车后桥进行了有限元分析,得到了该后桥在静载、制动、转向及扭转4种工况下的应变云图和张量图。通过分析应变云图和张量图,确定了该后桥的关键受载部位及其主应力方向,然后处理标定试验数据,线性回归出后桥载荷—应变的函数关系,并通过实车道路试验结果分析验证了通过有限元分析确定出的后桥应变传感器贴片位置的正确性。

In this paper,the load distribution of the rear axle of a MPV （Multi-Purpose Vehicle） is preanalyzed by using the finite element analysis method, which obtains the contour and the strain tensor map under the four working conditions of the rear axle with static load, braking, steering and torsion. By analyzing the contour and strain tensor maps, the key load locations and their main stress direction is identified. Through processing data of the calibration tests,the equations of linear regression between load and strain on the rear axle are determined. Comparing with the real vehicle road test resuits, the placement locations of the sensor on the rear axle which is determined through the finite element analysis, are verified to be correct.