Combined vibration reduction effect of sleeper pad and ballast pad in metro depot

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (23) : 20-29.

PU Qianhua1,2, WEI Kai1,2, HE Tianlong3, LIU Jie3, XIAO Dujie1,2

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Abstract

To investigate the problem of excessive vibration induced by the severe wheel-rail interaction of metro trains passing through the turnout area of the depot, relying on the good elasticity and damping characteristics of the sleeper pad and the ballast pad. Laying sleeper pad and ballast pad in turnout area provides an effective method to realize the homogenization of turnout stiffness and alleviate the problem of vibration over limit. Based on the principle of turnout stiffness homogenization and finite element model of turnout rail-turnout sleeper, the stiffness homogenization of sleeper pad is designed, and the influence of the stiffness before and after the stiffness homogenization of sleeper pad, the layout range of sleeper pad and the stiffness of fastener on the stiffness homogenization of turnout is discussed. Combined with the limit value of rail longitudinal deflection change rat, the preliminary design scheme of switch stiffness homogenization was clarified. Then, the coupled dynamic model of vehicle- turnout -ballast bed is established, and the test shaft drop height before and after the turnout stiffness homogenization is calculated. The indoor shaft drop test is used to evaluate the vibration reduction effect of the combination measures of ballast pad and sleeper pad, and the final design scheme of turnout stiffness homogenization is defined. Finally, field test is carried out to verify the damping effect of turnout stiffness homogenization. The results show that laying the sleeper pad in the turnout area is helpful to improve the uneven stiffness of the turnout along the longitudinal direction. A zoning design is recommended for the non-frog and frog areas to meet the limit value of rail longitudinal deflection change rate and the demand of vibration reduction effect in the turnout area. The stiffness of fastener has no significant effect on the homogenization of stiffness in the turnout area. When the ballast pad is used, the maximum insertion loss of Z vibration level is about 9 dB, and the vibration reduction effect of the combination of ballast pad and sleeper pad can reach about 15 dB. Field measurement results show that the combined damping method of sleeper pad and ballast pad can achieve the expected damping effect.

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metro depot / stiffness homogenization / sleeper pad / ballast pad / damping effect

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PU Qianhua1, 2, WEI Kai1, 2, HE Tianlong3, LIU Jie3, XIAO Dujie1, 2. Combined vibration reduction effect of sleeper pad and ballast pad in metro depot[J]. Journal of Vibration and Shock, 2024, 43(23): 20-29

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