高速列车车内噪声预测及分析

Prediction and Analysis of the Interior Noise of High-speed Train

以高速列车为研究对象,利用有限元法建立其车身结构和车室空腔模型,并建立车室声固耦合模型,计算出考虑声固耦合时车身模态与相应的结构模态,经分析得出:车室声腔对车身的作用不能忽略。为了了解高速列车的车内噪声情况,在高速列车上进行了现场噪声测试,得出车体振动主要引发车内中低频段噪声。另外,在考虑车身内饰和座椅吸声性能情况下,对车内噪声进行仿真和计算,获得了车内噪声的声场分布情况,从而可以指导高速列车车体结构的低噪声设计,节约产品研发时间及成本。

The high speed train was selected as the research object and it＇s structure model,cavity model and acoustic-structure coupling model were built using FEM.The modal of acoustic-structure coupling model of Carbody and it＇s corresponding structure model was computed with FEM software,which showed that the cavity of carbody effect on car-body could not be ignored.The experiment was done in the high-speed train which showed that the vibration of car-body initiated mainly middle-low frequency band noise in order to know the interior noise condition of high-speed train.Otherwise,the distribution condition of the interior noise of the car-body was obtained by simulation and calculation in Virtual.Lab Acoustics considering the body interior and seats absorption properties circumstances,which could be used to direct the low-noise design of high-speed train and saved the time of product development and product costing.