Based on the experiments on a platform with real vehicle structure and finite element simulation, the vibration and interior acoustic radiation under random excitations of high-speed trains’ bogie area were studied. Firstly, combined with line tests, a vehicle body with a length of 7 m was used as the research object. By comparing the results of experiment and simulation, the accuracy of the finite element model was verified. Secondly, the power spectral density curves at typical measuring points in bogie area were obtained by processing and calculating the line test data, which was measured when the vehicle ran at high speeds, and the standard vibration spectrum of the bogie area was obtained by the extreme envelope method. Furthermore, the random vibration test and simulation prediction analysis of the real vehicle structure were carried out to further verify the accuracy of the noise and vibration prediction model. Finally, according to the vibration and acoustic radiation theory, the indirect boundary element method was adopted to predict the acoustic response of the real vehicle. The analysis shows that the simulated power spectral density curves of acceleration and sound pressure level are highly consistent with the experimental ones, and the error between the simulated prediction and the experimental result is within the allowable range of 3 dB.

中文翻译：

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高速列车在随机激励下转向架区域的振动和声辐射

基于在具有真实车辆结构的平台上进行的实验和有限元模拟，研究了高速列车转向架区域在随机激励下的振动和内部声辐射。首先，结合线路测试，以车身长度7 m为研究对象。通过比较实验和仿真结果，验证了有限元模型的准确性。其次，通过处理和计算在车辆高速行驶时测量的线路测试数据，获得转向架区域典型测量点的功率谱密度曲线，并通过极值法获得转向架区域的标准振动谱。信封法。此外，进行了真实车辆结构的随机振动试验和模拟预测分析，以进一步验证噪声和振动预测模型的准确性。最后，根据振动和声辐射理论，采用间接边界元法预测真实车辆的声响应。分析表明，模拟的加速度和声压级功率谱密度曲线与实验曲线高度吻合，模拟预测与实验结果之间的误差在3 dB的允许范围内。采用间接边界元法预测真实车辆的声学响应。分析表明，模拟的加速度和声压级功率谱密度曲线与实验曲线高度吻合，模拟预测与实验结果之间的误差在3 dB的允许范围内。采用间接边界元法预测真实车辆的声学响应。分析表明，模拟的加速度和声压级功率谱密度曲线与实验曲线高度吻合，模拟预测与实验结果之间的误差在3 dB的允许范围内。