Abstract
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.
Highlights
With the rapid development of high-speed trains, the vibration and noise problem has become increasingly prominent
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
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
Summary
With the rapid development of high-speed trains, the vibration and noise problem has become increasingly prominent. Li et al [4] applied the finite element method to calculate the random sound field response of the thin plate excited by the random load, which showed that the acoustic response characteristics of the system depend on the acoustic frequency response function and the power spectral density (PSD) function. Liu et al [5, 6] studied the acoustic radiation sensitivity and optimization design under random excitation using finite element method, boundary element method and virtual excitation method. Combing the test with simulation method for real vehicle structure, we applied the finite element and indirect boundary element methods to study the vibration and noise of the vehicle body for a high-speed train under the random excitation from the bogie. A set of simple, practical, fast and accurate noise prediction methods for the high-speed train has been explored, which can provide more accurate acoustic characteristics evaluation at the beginning of design stage
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