Vertical vibration transfer characteristics of medium-low speed maglev rail-bridge systems

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (14) : 105-111.

LI Xiaozhen，XIE Kunyou，WANG Dangxiong，ZHU Yan

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Abstract

As a new mode of traffic, the track structure form of the medium-low speed maglev traffics is different from that of traditional wheel-rail traffics.In order to study its vertical vibration characteristics, based on a medium-low speed maglev test line, a twenty-meter prestressed concrete simply supported beam was taken as the research object.The finite element model for the vertical vibration transmission of the rail-bridge system was established and the vibration transmission characteristics were analyzed.Then, the influence of force location, vertical fastener stiffness and sleeper pitch on vertical vibration transmission characteristics of the rail-bridge system were discussed.The research results show that the displacement admittance of the system has two peak frequencies.These two peak frequencies correspond to the overall first-order vertical bending of the system and the local first-order vertical bending of the F-rail, respectively.With the increase of the distance between the inspection site and the load excitation point, the amplitude of the displacement admittance of the F-rail does not change significantly after the first-order vertical bending frequency of the F-rail.When the excitation is located at the fastener, the amplitude of the displacement vibration of the F-rail in the frequency range of 100—200 Hz is greater than that of the excitation at the non-fastener.The stiffness of the fastener and the distance between sleepers affect the local stiffness of the track structure, thus affect the local first-order vertical bending frequency of the F-rail and the displacement admittance amplitude of the F-rail at this frequency point.The local deformation of F-rail is significant.It is suggested that the effect of F-rail should be considered in the following research of a coupled maglev vehicle-bridge vibration model in time domain.

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medium-low speed maglev traffic / F-rail / girder / vertical vibration transmission / displacement admittance

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LI Xiaozhen，XIE Kunyou，WANG Dangxiong，ZHU Yan. Vertical vibration transfer characteristics of medium-low speed maglev rail-bridge systems[J]. Journal of Vibration and Shock, 2019, 38(14): 105-111

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