基于HHT方法的高速铁路接触网性能退化分析

HHT Method based Analysis on Performance Degradation of Overhead Contact System for High Speed Railway

以高速铁路接触网的接触压力为研究对象,通过建立简单链形悬挂接触网模型,用HHT法分析不同运行状态下接触压力的时频域变化情况,用边际谱将接触压力的时域特征转化为能量特征来分析性能退化趋势。分析结果表明,随着接触网运行状态的退化,接触压力的波动增大,能量特征值增大。该方法有效反映了接触网性能退化趋势,对保证接触网的安全稳定运行有重要意义。

With contact pressure of catenary for high speed railway as an object of researches, the paper introduces the principle of extraction of contact pressure of catenary by means of HHT method, analyzing is made for changes of time domain of contact pressures under different operation status through establishment of simple chain suspension catenary model, and analyzing is made for the trend of performance degradation through transforming of contact pressure＇s time domain feature into energy feature by means of marginal spectrum. The analyzing results show that fluctuation of contact pressure and energy feature values will increase along with degradation of catenary operation status. The method reflects effectively the trend of performance degradation of catenary, and is significant to guarantee safety and reliable operation of catenary.