Thirdly, the paper has discussed the generation mechanism, acoustic model and the simulation model of the road noise on the basis of the tire pattern noise, and carried out the simulation analysis.
再次，在对轮胎花纹噪声研究的基础上，探讨了道路噪声的发声机理、 发声模型及其仿真模型，并进行了仿真实验分析。
The mechanism of noise generation 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。
First, the generation mechanism, components and frequency characteristic of radiated noise of naval ships are studied. There exists periodical modulation for the amplitude of propeller noise.
首先讨论了舰船辐射噪声的产生机理、构成和频率特性，指出螺旋桨噪声的振幅存在周期性调制。
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