A study on vibration reduction characteristics of semi-active magnetorheological vibration absorbers for vehicle bodies

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (16) : 124-134.

ZHOU Weihao1，WEN Yongpeng1，SHANG Huilin2，ZONG Zhixiang1，GUO Linsheng1

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Abstract

To reduce urban railway vehicle bodies’ vertical vibration and improve passenger comfort based on the characteristics of magnetorheological elastic material, whose stiffness and natural frequency are adjustable, the vertical vibration model with semi-active vibration absorber including magnetorheological elastomer was established.The method of designing a dynamic vibration absorber using a magnetorheological elastomer, which is suitable for urban railway vehicles, was presented.Because urban railway vehicle traffic and speed change frequently, the best design frequency expression of the magnetorheological absorber can be obtained by multiple regression analysis.The vehicle body’s vertical vibration reduction characteristics with semi-active magnetorheological vibration absorber after-stiffness optimization was studied.Then the advantages of the magnetorheological vibration absorber were further established.The results show that the vibration absorptive capacity of the semi-active magnetorheological vibration absorber is superior to that of the passive vibration absorber at each of the vehicle body’s frequency points within the effective working frequency band of magnetorheological vibration absorbers.So the advantages of the broadband vibration damping are obvious.The magnetorheological absorber, which is modified by the best design frequency expression, can be in a resonant state with the vehicle body at all times to keep the vehicle consistently running at superior quality levels.The study provides a reference basis for the application of a semi-active vibration absorber utilizing a magnetorheological elastomer, which is used in urban railway vehicles.

Key words

vehicle body / vertical vibration / magnetorheological elastomer / vibration absorber / vibration reduction / sperling index

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ZHOU Weihao1，WEN Yongpeng1，SHANG Huilin2，ZONG Zhixiang1，GUO Linsheng1. A study on vibration reduction characteristics of semi-active magnetorheological vibration absorbers for vehicle bodies[J]. Journal of Vibration and Shock, 2018, 37(16): 124-134

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