提高钢轨应变灵敏度的测量方法研究

Research on Measurement Method of Improving the Strain Sensitivity of Rails

本文基于剪力测试法仿真分析计算了6种不同布片组桥方案在恒定荷载作用下的应变灵敏度响应输出。仿真分析结果表明:单组桥方案中应变灵敏度响应随着测量范围的缩小而增大,不能同时实现应变灵敏度响应和测量范围的最大化。而通过将紧邻轨枕边的2组桥路应变灵敏度响应输出进行线性叠加,能显著提高近似恒定的应变灵敏度响应输出,同时能实现测量范围的最大化。这为准确获取并识别轮轨力应变信号并判断列车的运行状态和推算轮轨间作用力大小提供了有利条件,是一种切实可行的提高灵敏度的测量方法。

In the paper,based on the shear test method,the strain sensitivity response output of six different patch bridge schemes under constant load is calculated.The simulation results show that the strain sensitivity response in the single-group bridge scheme increases with the reduction of the measurement range,and the strain sensitivity response and the measurement range cannot be maximized at the same time.However,by linearly superimposing the two sets of bridge strain sensitivity response outputs close to the sleeper side,the approximately constant strain sensitivity response output can be significantly improved,and the measurement range can be maximized.It provides advantage for accurately obtaining and identifying the wheel-rail force strain signal,judging the running state of the train and estimating the force between the wheel and rail,and is a practical measurement method to improve the sensitivity.