A Numerical Method for Analyzing the Low-Frequency Noise of Bridge under Vehicle Load

A numerical method is developed to analyze the low-frequency noise of bridge under vehicle load. It is divided into two sections: (1) the analysis of vehicle-bridge interaction system based on finite element method (FEM), when the bridge is modeled by shell element and vehicle is modeled by a theoretical model with four degrees of freedom; (2) the numerical method to predict the low-frequency noise caused by bridge vibration, when the sound pressure is derived using the theory of acoustics and Fast Fourier Transform (FFT) technology. As an example, the low-frequency noise of a practical bridge is investigated. The numerical results are compared with the measured data in experiments, which indicate the validity of the current method. Finally, the influence of road surface roughness is discussed.