高速动车组低频周期性晃动问题分析与诊断

高速动车组同一车厢的两个转向架同相蛇行运动频率与车体固有上心滚摆频率接近时,车体因共振而出现低频周期性晃动,不仅影响乘坐舒适性,还会造成脱轨.本文根据低频周期性晃车成因,提出一种以车体横向加速度为研究对象的诊断方法.首先设置车体横向加速度阈值,对超阈值处延拓获得可能存在问题区段,然后利用集合经验模态分解法对这些区段车体...

Analysis and Diagnosis of Low Frequency Periodic Shaking of High Speed EMU

When the frequency of in-phase hunting motion of two bogies in the same carriage of high speed EMU is close to the upper center roll pendulum natural frequency of the vehicle body,the low frequency periodic shaking of the vehicle body due to resonance will not only affect the ride comfort,but also cause derailment.According to the causes of low frequency periodic vehicle shaking,a diagnosis method based on the lateral acceleration of vehicle body was proposed in this paper.Firstly,the threshold value of the lateral acceleration of the vehicle body was set,and the possible problem sections were obtained by extension at the exceeding threshold value.Then,the frequency adaptive decomposition of the lateral acceleration signal of the vehicle body in these sections was carried out by using the ensemble empirical mode decomposition method to obtain multiple components.The principal component was determined by calculating the standard deviation,whether there is a peak value of the principal component exceeding0.1g section for 6 consecutive times was judged,and the exceeding section was recorded as a suspected shaking section.The vibration dominant frequency and energy factor of the suspected shaking section were calculated.If both meet the requirements,it is determined that the low frequency periodic vehicle shaking occurs when the EMU passes through the section.The field measurement shows that this method can effectively capture low frequency periodic vehicle shaking.