Research On Contact Vibration And Noise Between Collector And Third Rail Under Random Vibration

Flourish in urban rail transit brings convenience to people’s lives, but also brings increasingly serious environmental pollution, noise and vibration problems to the urban environment. Recent discovery of subway operation shows that MTR collector/the third rail running process will produce great noise. However, the noise between the collector and the third rail has not been researched before. Taking one kind of subway vehicle collector and third rail as research object, this paper uses the finite element method to analysis the collector and third rail dynamic characters. Through combining with the field test, the law of contact vibration between collector and third rail under random vibration is researched. Based on this study, the collector noise is simulated using the boundary element method. The main work and achievements of this paper are as follows.(1) Taking down contact collector used in one kind of subway vehicle as the research object, the collector/third rail simulation model is established using Pro/E design software.(2) By properly defining the material property of the collector/third rail system, grid is divided using HyperMesh, and a modal analysis based on finite element is carried out, to investigate the collector and third rail modal, as well as the natural frequency of collector/third system, the ratio of the third rail with collector quality, as well as variation of the relative position of collector on the third rail, while the collector is in contact with the third rail.(3) Taking urban rail vehicle collection dynamics and vehicle system dynamic analysis into account, the vibration sources of collector/third rail is analyzed. After using ADAMS software to establish collector/third rail system rigid body dynamics model, the simulation contact force between the two has gotten. The simulation contact force will be loaded into the finite element model transient analysis.(4) Experimental data of down contact collector contact force is obtained through field test in a subway line. The post-processed experimental data and simulation data are compared to verify the accuracy of the rigid body dynamics model. By loading the experimental contact force on the collector/the third rail system and doing transient analysis, the collector’s displacement and acceleration response varied with time is obtained, which is compared with the actual operation and displacement response and acceleration response to verify the correctness of the finite element model.(5) By writing ANSYS Parameter Design Language vibration displacement response of collector node is exported, as the boundary conditions of sound--vibration analysis software SYSNOISE of collector model to obtain the variety rule of noise variation model in sound field, thus drawing relevant conclusions.