Research on Causes and Countermeasures of Abnormal Flexible Vibration of Car Body for Electric Multiple Units

doi:10.3901/JME.2019.12.178

Abstract

Abstract: Under normal operating condition, electric multiple units(EMU) car body can maintain a very excellent dynamic performance, which could create a comfortable travel environment for passengers. But in case of occasional abnormal flexible vibration, also known as the car body shaking phenomenon, which seriously affecting the ride quality. Based on the measured wheel and rail profile, the rigid-flexible coupling dynamic model of an EMU vehicle with flexible car body is established. The abnormal flexible vibration of vehicle car body is simulated and the causes of the abnormal vibration are studied. The results show that wheel-rail contact relationship is abnormal and the equivalent conicity reaches 0.65, which leads to the frequency of bogie hunting motion comes up to 9-10 Hz, which is close to the first-order diagonal distortion mode frequency of EMU car body. As a result, car body shaking phenomenon occurs. For this reason, improving wheel-rail contact relationship, increasing the first-order diagonal distortion mode frequency and controlling the phase relationship of two bogies hunting motion is the three main directions to suppress the abnormal flexible vibration. Through the simulation analysis, it is found that grinding rail and re-profiling wheel can improve the wheel-rail contact relationship, which effectively solve the problem of car body shaking. Improving the first-order diagonal distortion mode frequency of the car body can be used to separate the bogie hunting motion frequency from the car body elastic mode frequency, then the abnormal vibration can be suppressed. In addition, controlling the front and rear bogie anti-phase hunting motion can also avoid the car body shaking due to first-order diagonal distortion mode. At last, it is recommended to polish the abnormal rail profile. In order to enhance the adaptability of EMU car body on worn wheel and abnormal line, for the new designed high-speed EMU car body, it is recommended to increase the first-order diagonal distortion mode frequency. *

Key words: car body shaking, countermeasures, electric multiple units, flexible vibration, hunting motion, wheel-rail contact

CLC Number:

U270

LI Fansong, WANG Jianbin, SHI Huailong, WU Pingbo. Research on Causes and Countermeasures of Abnormal Flexible Vibration of Car Body for Electric Multiple Units[J]. Journal of Mechanical Engineering, 2019, 55(12): 178-188.

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