车内噪声预测及平稳舒适性研究

Prediction of Interior Noise and Stability Comfort for High-Speed Train

以高速列车为研究对象,分别建立高速列车的车身结构和车室声腔有限元模型,最终得到高速列车声固耦合模型。在ANSYS中计算出车身结构的振动位移响应,并以其作为声学仿真的边界条件。使用Virtual.Lab声学仿真软件对声固耦合模型进行仿真,得到所取观测场点的声压级频谱。为了验证所建立的高速列车声固耦合模型的准确性,在运行的高速列车上测试了车速在240 km/h和260 km/h下观测点处的A计权声压级频谱。经分析得出,车内噪声随着速度的增加而增大,计算得到的声压级频谱与实测结果的变化趋势基本一致。为了了解乘客乘坐高速列车的舒适程度,使用SIMPACK软件对其平稳舒适性进行动力学仿真。得出列车运行时平稳舒适性为优。

The high speed train was selected as the research object and its acoustic-structure coupling model was finally obtained by establishing car-body finite element model and car cavity acoustic finite element model in Hypermesh. Vibration displacement response of car-body structure was regarded as the boundary conditions of acoustic simulation, which was computed in ANSYS. The sound pressure frequency spectrum of survey field points were obtained by the simulation of the acoustic-structure coupling model in Virtual. Lab. In order to verify the accm＇acy of the acoustic-structure coupling model of high-speed train, the test was carried out on the moving high-speed train at the speed of 240km/h and 260kin/h, also, the weighed sound pressure frequency spectrum of survey field points A were received. The analysis results show that with the increment of lhe speed the interior noise becomes bigger and sound pressure frequency spectrum which were obtained from simulation has the same trend as that of experiment. In order to know the degree of comfort when the passengers took the high-speed train, its stability conffort for dynamic simulation was done in SIMPACK. Some results are obtained, which show the stability comfort is excellent when the high-speed train runs.