轮轨激励下高速列车头车乘客室室内的声学响应研究

建立了某高速列车头车－轨道的耦合动力学仿真模型、车身的有限元模型、乘客室的声学边界元模型，计算出了由轨道不平顺引起的乘客室内的噪声分布状况，得出了如下结论：当列车运行速度为200km/h时，乘客室内的A声级在61.9～69.6dBA之间变化；乘客室内A声级较大的场点在40Hz、200Hz频率处的声压级较大；要降低乘客室内的噪声，必须对总声级起决定作用的频率段（40Hz、200Hz）采取措施。针对40Hz的低频噪声，最好在声学贡献最大的面板上采取阻尼降噪措施；针对200Hz的中频噪声，则宜在声学贡献最大的面板上敷设一层在该频率上吸声性能好的吸声材料。

Interior noise study of passenger room of high speed train under wheel-rail excitation

A series of models, namely the vehicle-track coupling dynamics model, the finite element model of train head, the acoustical boundary element model of passenger room of high speed train, have been established. The interior noises of passenger room caused by track irregularities have been calculated, and the distribution characters of the internal noise of passenger room have been ascertained and reached the following conclusion: The noise in passenger room changes in the range of 61.9～69.6 dBA. At the frequency of 40 Hz and 200 Hz, the sound pressure levels in passenger room are greater. To reduce the biggest noise in the passenger room, measure must be adopted at frequency 40 Hz and 100 Hz, which are the decisive frequencies. At the frequency of 40 Hz, it is better to coat with viscoelastic layer on the panel with the biggest acoustical contribution; At the frequency of 200 Hz, it will more suitable to lay good sound absorption material whose performance is good at frequency 200 Hz.