Design method for multiple dynamic absorbers to reduce the vibration of a urban-rail vehicle body

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (2) : 154-162.

ZONG Zhixiang1,WEN Yongpeng1,SHANG Huilin2,GUO Linsheng1,ZOU Yu1

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Abstract

In order to enable the dynamic absorber to more mitigate reduce the vibration of a rail vehicle body and also to better adapt to the remaining space of the lower part of the vehicle, according to the principle of multiple dynamic absorbers, a rail vehicle with multiple dynamic absorbers was modelled in full consideration of the operation characteristics of the urban rail vehicle.By virtue of the vibration model, a design method for multiple dynamic absorbers of urban rail vehicles was proposed.The influence of passenger capacity and velocity change on the damping performance of multiple dynamic absorbers, was discussed, the limitation of traditional multiple dynamic absorbers was pointed out, and then considering the specialties of frequent changes in the vibration frequency of rail vehicles, an optimization method for the target frequency of the multiple dynamic absorbers was proposed, so as to limit the occurrence of vibration growth.Taking four typical urban track lines as examples, the DVA index as a criterion to evaluate vibration reduction effect, was used to obtain the optimal target frequency of the multiple body dynamic absorbers of each line respectively, and to verify the effectiveness of the optimization method.The results show that with the same additional mass, the multiple dynamic absorbers have better vibration absorption capability than the single dynamic absorber.In practical application, it is a more appropriate choice to install a quadruple dynamic absorber on the vehicle body.The multiple dynamic absorbers can play a good damping effect in the entire speed range, which can effectively avoid the occurrence of vibration growth phenomenon.The target frequency of multiple dynamic absorbers should be adjusted for different lines, and specific lines need to be specified to produce the best damping ability.The study provides a reference to the research and application of multiple dynamic shock absorbers to the vehicle body.

Key words

vehicle body;multiple dynamic vibration absorbers / vibration reduction / DVA vibration reductionindex / Sperling index

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ZONG Zhixiang1,WEN Yongpeng1,SHANG Huilin2,GUO Linsheng1,ZOU Yu1. Design method for multiple dynamic absorbers to reduce the vibration of a urban-rail vehicle body[J]. Journal of Vibration and Shock, 2020, 39(2): 154-162

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