振动条件下铁路继电器寿命预测研究

Study on Life Prediction of Railway Relay under Vibration

铁路继电器工作中的可靠性与安全性是确保各种铁路设备正常工作的必须要求,在列车控制方面发挥着重要的作用。本文根据加速试验原理与试验条件制定了在振动应力下铁路继电器的加速寿命试验方案,并通过加速寿命试验获得了铁路继电器触点接触压降的数据。选择接触压降作为继电器性能退化特征参数,利用小波阈值法对得到的接触压降数据进行去噪处理,并建立了EEMD-RBF预测模型对继电器寿命进行预测。对EEMD-RBF与RBF的误差进行对比分析,结果表明EEMD-RBF模型预测精度更高。最后,根据预测出来的寿命,运用逆幂律方程预测出正常振动应力水平下铁路继电器的寿命。

Reliability and safety of railway relay in its work is a must to ensure that the various railway equipment can work normally. As a result, railway relay plays an important role in the train control. In this paper, according to the test conditions and the principle of accelerated test, the accelerated life test plan of railway relay under vibration has been made, also the relay contact point voltage data are acquired in the accelerated life test. The contact voltage is chosen as the relay characteristic parameter indicating performance degradation and wavelett hreshold method is introduced in order to improve the quality of contact point voltage data. At the same time, EEMD-RBF model is established to predict the life of relay. By analyzing the errors between EEMD-RBF and RBF, it shows that the EEMD-RBF model has a better prediction accuracy. Finally, based on the predicted life, the inverse power law equation is used to extrapolate railway relay life under the normal vibration stress.