Application of FEM-IFEM in Structure-borne Noise of Urban Rail Transit Box-girders Simulation Analysis

The basic theories of finite element-infinite element and boundary element method are introduced. Aiming at the calculation of urban rail transit bridge structure-borne noise, taking a single box girder as an example, the vehicle-track-bridge vibration coupling finite element model is established in the Abaqus software, and the box-girder vibration simulation results are obtained; the finite element-infinite element method is used in the Abaqus software to establish a simulation model of bridge radiation structure noise; boundary element method was used in Virtual.lab software to establish a boundary element simulation model. The noise simulation results of the box-girder top, bottom, web and wing panels in the near field are analyzed and compared. The results show that the noise simulation results of the two algorithms and the box-girder vibration simulation results are in good agreement with the spectrum curve trends of the box-girder top, bottom, web and wing plates. The noise simulation results are in the frequency range of 1~200 Hz, with little difference in the total sound pressure level. It is shown that the finite element-infinite element method noise simulation results are reliable and can be applied to the research of urban rail transit bridge noise problems.