中文摘要：

为了研究桥梁交通振动辐射低频噪声的机理和建立相应的数值模拟方法，用车桥耦合振动和空气波传播原理提出桥梁振动辐射低频噪声的计算方法。以一座简支钢桥为例，用格子梁结构计算模型分析车辆通过时的结构振动和南此引起的声压，通过与现场实测结果的对比，验证理论方法分析桥梁振动辐射低频噪声机理的可能性。在此基础上进一步对路面平整性、车辆计算模型等参数的影响进行对比分析，探索路面以及车辆模型对计算结果的影响。结果表明，平整路面可以降低桥梁辐射低频噪声的强度；采用不同的车辆模型对计算得到的声压有一定的影响；为了提高精度需要对高频范同内的桥梁振动计算方法、非平稳信号分析以及声波在边界上吸收、反射等方面进行进一步改进。

英文摘要：

The vehicle-bridge coupling vibration theory and the propagation principle of air wave are applied to establish a numerical method for calculation of low-frequency noise induced by bridge vibrations. A simply supported steel bridge in service is simulated as a lattice girder model as a case study. Dynamic responses of the bridge due to vehicles are calculated and the sound pressures of low-frequency noises are obtained by using the numerical method, and the results are compared with the experimental data to validate the probability of the theoretical approach to sound pressure computation. Further studies on the effects of parameters such as road surface roughness and parameters of vehicles have been conducted. According to the analysis, smoothing road surface may decrease lowfrequency noise produced by bridge vibration, the simulation method for vehicles has certain effects on the calculation of sound pressures, and in order to increase the calculation accuracy, the calculation for bridge vibration in high frequency range, the non-stationary signal analysis, the boundary absorption and reflection of sound wave need further improvements.