针对某地铁车辆辅助变流器噪声超标问题,提出辅助变流器气动噪声源和传播过程的数值仿真方法,分析辅助变流器气动噪声特性,在此基础上有针对性地提出增加整流网、叶片数、共振腔等优化方案.通过对比发现:增加整流网后,出口测点总声压级降低2.5 dB(A);将原叶片数由6片增加至7片后,出口测点总声压级降低1.5 dB(A);增加共振腔后,出口测点总声压级降低0.5 dB(A);采用综合优化措施后,整个频段声压级均不同程度降低,出口测点总声压级降低7.1 dB(A),降噪效果显著,所提出的优化措施可为低噪声的变流器设计与开发提供参考.%Focused on the excessive noise of the metro vehicle auxiliary converters,the numerical simulation method of the aerodynamic noise source and the propagation process is adapted to analyze the aerodynamic noise characteristics of the auxiliary converters.On this basis,some improvement schemes,such as adding the rectification net and resonant cavity, increasing the number of blades etc.,are proposed.By comparing the results of the improvement schemes with that of the original model,it is found that the total sound pressure level of the noise at the outlet measurement point decreases by 2.5 dB (A)after adding the rectification net,and decreases by 1.5 dB(A)when the number of the blade increases from six to seven. After adding the resonant cavity, the total sound pressure level at the outlet measurement point decreases by 0.5 dB(A). When these improvement measures are combined,the sound pressure level of the entire frequency band reduces obviously and the total sound pressure level at the outlet measurement point is reduced by 7.1 dB(A). This work may provide a reference for design and development of low noise converters.
展开▼
