振动频率对铁路继电器触点可靠性的影响研究

Study on the influence of vibration frequency on the reliability of railway relay contacts

铁路继电器通常都在具有振动或者冲击的力学环境下工作,所以继电器耐力学环境的能力对于其接触系统就十分重要。本文以S·JWXC-1000型铁路信号继电器为研究对象,以动静触头接触力非线性变化情况为判定接触是否可靠的依据,对于有限位结构的触簧系统,采用模态分析、谐响应分析和隐式动力学分析算法,通过改变振动加速度和振动频率的方法来对不同振动载荷下触簧系统的触点可靠性问题进行仿真研究。由仿真分析可知,触簧系统在接近一阶固有频率时触点接触力会出现十分不稳定的情况;在远离固有频率时触点可靠性较高,但是在70~90Hz频率范围内出现了不稳定→趋于稳定→不稳定→稳定的触点接触力变化情况。研究结果可为铁路相关低压电器的振动可靠性问题提供一定参考。

Railway relays typically operate in a mechanical environment with vibration or shock,so the ability of the relay to withstand the mechanical environment is important to its contact system.This article takes S·JWXC-1000 railway signal relay as the research object,and the nonlinear change of the contact force of the dynamic and static contact is used as the basis for judging whether the contact is reliable.For the finite-structure contact spring system,modal analysis,harmonic response analysis and implicit power are adopted.The analysis algorithm is used to simulate the contact reliability of the contact spring system under different vibration loads by changing the vibration acceleration and vibration frequency.According to the simulation analysis,the contact spring force will be very unstable when it is close to the first-order natural frequency;the contact reliability is higher when it is far away from the natural frequency,but it appears in the frequency range of 70~90Hz.Unstable-tends to be stable→unstable→stable contact contact force changes.The research results can provide some reference for the vibration reliability of railway-related low-voltage electrical appliances.