The primary drive gear(crankshaft gear)and the primary driven gear are the source of noise due to their high speed and bigger reduction ratio.
作为摩托车初级传动的曲轴齿轮及初级从动齿轮，由于转速高及降速比大，是产生噪声的主要因素。
The fan-noise is classified according to the noisy source, some of the schemes of noise integration control and reduction are puts forward in this paper.
阐述了局部通风机噪声的分类，产生这些噪声的原因，以及综合控制、减小这些噪声的方法。
Described are the sound source detection method for the aerodynamic noise on Shinkansen rolling stock and relevant noise reduction measures.
介绍了新干线车辆空气动力噪声的声源探测方法及相应的降噪措施。
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