城轨车辆辅助逆变器声场仿真分析及优化

Acoustic Simulation and Optimization of Auxiliary Inverter of the Urban Rail Transit

为改善辅助逆变器的噪声问题,采用多物理场耦合仿真的方法分析了逆变器的主要噪声源,首先采用大涡模拟方法对风道流场进行了瞬态仿真计算,得到了壁面压力脉动,然后通过FFT将声源位置的时域压力脉动转换成频域分布,映射到谐响应分析模块中计算振动噪声。基于分析结果,提出了几种降噪方案,对比分析了降噪效果,并通过试验验证了优化方案的合理性。为今后轨道车辆降噪设计提供了一定的借鉴。

In order to improve the noise of auxiliary inverter,method of multi-physics simulation is used and the main noise source is analysed.Firstly,simulated the transient flow field of wind tunnel using The large eddy simulation(LES)method and got pressure fluctuation on the wall.Then transformed the pressure from time domain to frequency domain and mapped it to Harmonic response analysis module to simulate vibration noise.Based on the analysis results,several noise reduction schemes were proposed and analyzed,and the rationality of the optimized scheme is verified by experiments.A certain reference for the design of noise reduction for rail vehicles was provided in the future.