轮轨摩擦温升对脉冲涡流响应信号的影响研究

Study on effect of frictional temperature on pulsed eddy current testing

脉冲涡流(Pulsed eddy current,PEC)技术是通过感知伤损引起的电导率等物理属性的变化,实现伤损检测的。摩擦温升现象在列车运行过程中不可避免,可在短时间内导致钢轨的物理属性发生变化。在列车高速运行情况下,对随程检测过程中的PEC等电磁检测技术的检测结果,尤其是对微小伤损的检测会产生不可忽视的影响。文章基于经典herz接触理论和多场耦合模型研究了轮轨间摩擦温升现象与PEC检测信号的相互作用。仿真结果显示轮轨间的摩擦温升现象会造成微小伤损的误检,给列车安全运行带来隐患。

Pulsed eddy current（ PEC） testing technology is used to detect the defects through sensing the changes of physical properties. Frictional temperature is an inevitable phenomenon during train running,which can change the physical properties of the rail in a short time. During the high-speed running of the train,the impacts on the results of electromagnetic detection technologies,such as PEC testing,caused by the frictional temperature are not negligible,especially for the detection of minor damage. Based on the classical Herz contact theory and multi-field coupling model,this paper studies the influence of frictional temperature rise on the PEC detection signal. The simulation results show that the frictional temperature between the wheel and rail can cause the false detection of defect,which may threaten the safe running of train.