Analysis On Dynamic Characteristics And Vibration Mitigation Effect Of Different Metro Track Systems

In recent years, people pay more and more attention to nosie and vibration caused by urban rail transit. With the large-scale construction of urban rail transit, vibration and noise reduction is gradually becoming a problem to be solved urgently. Experts and scholars at home and abroad have done a lot of research about the source of vibration and the route of vibration transmission. In this paper, metro vehicle-track coupling system is taken as the research object. The research contents focus on the dynamic characteristics and vibration transmission of railway track structure. The research mainly includes the following aspects:1) Based on the theory of vehicle-track coupling dynamics, this article establishes4track systems including general track bed, vibration absorber fastening track, LVT track and ladder-shaped sleepers track and compares there dynamic characteristics. Meanwhile, vibration mitigation effect is analyzed using following3indexes:vibration level,1/3octave, transfer function.etc. Gauss white-noise method is used to analyze frequency domain response of structure.2) This thesis analyses some factors that influence the dynamic response of track system. Speed, fastener stiffness, fastener space and track irregularity are considered for general track bed track system. Rubber hardness and rubber angle are considered for vibration absorber fastening track system. Fastener stiffness and stiffness under sleeper are considered for LVT track and ladder-shaped sleepers track system.3) According to the problems produced in practical application, this article proposes some corresponding optimizations and compares its response.The work done in this paper can give some suggestions for metro track structure selection, and give some references for parameter design of vibration-control track system.