Analysis of the spectral induction and hierarchical transmissibility for railway vehicles’ measurement vibration environment
Chenxin Deng, Jinsong Zhou, Wenjing Sun, Dao Gong, Yu Sun
Abstract
The vibration environments of railway vehicles can be considered as the source of the vibrations in respective parts of that. With a certain vibration environment above the limit, structural cracks or component drops occur because of the vibration of axle box and bogie frame. Considering the multi-channel and non-normal characteristics of the measured environment of rail vehicles, a statistical induction method is combined with Johnson system, and a universal technique of vibration environment spectral induction is proposed. By the measured acceleration data from a test vehicle with the problem of the component (transponder) drops from bogie frame, the induced spectrum is calculated, and its comparison with the functional test spectrum from the international standard IEC 61373 reveals that the vibration environment of bogie frame exceeds the limit. Based on the induced spectrum, the hierarchical transmissibility of the primary and secondary suspensions of the test vehicle is derived. It is found that the over-limit vibration environment of bogie frame derives from the high hierarchical transmissibility of the primary suspension. The results show that the proposed technique of spectral induction and hierarchical transmissibility can accurately reflect the measured vibration environment and the layer-by-layer transmission of rail vehicles.