某型发动机啸叫噪声降噪技术研究

Research on the Squeal Noise Reduction Technology of an Engine

分析了某型发动机啸叫噪声的生成机理,结论为啸叫噪声由发动机2130Hz扰动力激发旋转飞轮四瓣花振型共振辐射产生。由此提出了飞轮移频的降噪措施,并对飞轮进行结构调整。试验结果表明:该型发动机的啸叫噪声得到控制,整机空气噪声A声级下降了7.8 dB,达到了发动机设计指标要求。

Based on an engine, the mechanism of its squeal noise generation was studied. It was conclu- ded that the squeal noise was caused by the engine＇ s 2 130 Hz disturbance force exciting the four-leaved flower type resonance radiation of rotating flywheel. Therefore, the method of flywheel frequency shift for reducing the squeal noise was suggested. The mechanical structure of flywheel was redesigned and the test results show that the squeal noise of the engine was controlled. A-weighted sound level airborne noise of the engine was reduced by 7.8 dB according to the tests, which technically satisfied the design requirements.