Vertical vibration characteristics of urban rail elastic vehicle body with under-vehicle equipment

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (21) : 97-103.

GUO Linsheng1, WEN Yongpeng1, SHANG Huilin2, ZONG Zhixiang1, SUN Qian1

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Abstract

In order to study relationship between vibration characteristics of urban rail elastic vehicle body and under-vehicle equipment, a rigid-flexible coupled multi-body dynamic model for the equivalent Euler beam vehicle body with under-vehicle equipment was established using the modal superposition method.Vibration responses of the vehicle body’s middle part and the upper one on the vehicle bogie were analyzed under various different operating conditions.The sensitivity of the first-order elastic modal frequency of the vehicle body to the elastic resonance velocity was discussed.Along the whole vehicle length, the coupled vibration relationship between the vehicle body and the under-vehicle equipment was analyzed.The variation of the whole vehicle’s vibration was analyzed to evaluate the stability of the vehicle at last.The results showed that elastic suspension of under-vehicle equipment can effectively suppress vibration of the entire vehicle body; from the view point of suppressing the entire vehicle body vibration, it is necessary to symmetrically install the equipment under the middle of the vehicle body, and choose different elastic suspension devices for under-vehicle equipment with different mass; the vehicle body’s elastic vibration is greatly affected by the resonance speed, vehicle operation under non-resonant speed can effectively avoid the overall vehicle elastic resonance and improve passengers’ comfort; the study results provide a reference for reducing elastic vibration of urban rail vehicles, improving passengers’ comfort, reasonably locating under-vehicle equipment and appropriately choosing its elastic suspension devise.

Key words

urban rail vehicles / flexible car body / flexible vibration / suspended equipment / coupled vibration?

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GUO Linsheng1, WEN Yongpeng1, SHANG Huilin2, ZONG Zhixiang1, SUN Qian1. Vertical vibration characteristics of urban rail elastic vehicle body with under-vehicle equipment[J]. Journal of Vibration and Shock, 2019, 38(21): 97-103

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