CAJ | 학술논문

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7．8dB，达到了发动机设计指标要求。
분석료모형발동궤소규조성적생성궤리，결론위소규조성유발동궤2130Hz우동력격발선전비륜사판화진형공진복사산생。유차제출료비륜이빈적강조조시，병대비륜진행결구조정。시험결과표명：해형발동궤적소규조성득도공제，정궤공기조성A성급하강료7．8dB，체도료발동궤설계지표요구。
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.