A new isolation bearing was proposed to reduce the vertical traininduced vibration in order to improve the vibration serviceability of overtrack buildings of metro depots and provide an effective measure of vibration reduction. The structure and characteristics of the bearing were introduced, and the design method was put forward in theory. Based on anactual metro depot project, the dynamic responses of the upper structure before and after using the new isolation bearings were comparatively analyzed through numerical simulations and their vibration reduction effects were evaluated.The results show that the vibration responses of the isolated structure are amplified at the first order vertical natural frequency 5.44 Hz and the local modal frequency 16Hz of the floor but its vibration responses in other frequency bands are obviously reduced. Its Z vibration level of each layer is less than that of the original structure and the maximum difference is 12.1dB. For the new isolation bearing,the vibration reduction effect is very obvious in frequency bands above 10 Hz, the maximum insertion loss of its 1/3 octave vibration level is up to 20 dB and the Z vibration level is deceased by 10 dB.
谢伟平,王政印,孙亮明. 地铁车辆段新型隔振支座的减振效果研究[J]. 振动与冲击, 2018, 37(10): 63-70.
XIE Wei-ping WANG Zheng-yin SUN Liang-ming. Vibration reduction effect of a new isolation bearing for a metro depot. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(10): 63-70.
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