Thirdly, the paper has discussed the generationmechanism, acoustic model and the simulation model of the road noise on the basis of the tire pattern noise, and carried out the simulation analysis.
The mechanism of noisegeneration of fan for center air-conditioner is analyzed. A few measures of noise reducing is introduced. Good result is obtained in practical use.
分析了中央空调组合机组内离心通风机噪声产生的机理。介绍了几种降噪措施。实际应用中取得良好效果。
3
First, the generationmechanism, components and frequency characteristic of radiated noise of naval ships are studied. There exists periodical modulation for the amplitude of propeller noise.