中文摘要：

基于FE-SEA混合法建立高速列车车体铝型材振动声辐射预测模型,并与FE-BEM模型的预测结果进行对比分析,验证模型的有效性,进而运用该模型分析黏弹性阻尼减振降噪技术对于抑制铝型材振动声辐射的效果。结果表明：在型材顶板、底板以及型材内表面敷设黏弹性阻尼可明显抑制500 Hz以上中高频频段的振动声辐射。在型材表面敷设黏弹性阻尼时,型材声辐射效率变化不大,型材振动被抑制导致其向半空间辐射声功率降低。对比顶板和型材内表面阻尼敷设形式,在型材底板敷设阻尼具有较高的经济性,更加有利于实现车体的轻量化设计。相关结果可为高速列车车体铝型材的减振降噪设计提供理论参考。

英文摘要：

The hybrid FE-SEA model was developed to predict the sound radiation of section aluminum of high-speed train＇s car-body. The model was verified through the comparison of the results with those calculated by using the FE-BEM model. The effect of the viscoelastic damping technique on the sound radiation suppression was analyzed with this model.The prediction results show that the sound radiation of the section aluminum with viscoelastic damping material attached to the top and the bottom and the inner surface of the section aluminum can significantly suppress the sound radiation in the medium-and-high frequency range above 500 Hz. While the acoustic radiation efficiency does not change a lot if the viscoelastic damping material is attached to the outer surface of the section aluminum. Comparing the types of the viscoelastic damping material attachment, it is concluded that the viscoelastic damping material attached to the bottom is more economic and feasible. It is beneficial for the light car-body design. This work may provide a theoretical guidance for the design of the section aluminum for noise and vibration reduction of the car-bodies.