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。
Testing and analyzing the noise source of idle run and cutting, noise frequency characters and all kinds of methods for noise reduction for the surface planer were carried out.
试验和分析木工平刨床空转和切削时的噪声源、噪声频率特性和各种降噪方法。
The results show that reduction of fuel pipe vibration or improving damping function of hose clip can control the effect of source of vibration on interior noise.
结果表明，减小油管的振动或提高管夹的减振功能可控制振动源对车内噪声的影响。
The design principle of the system, the source of noise and its reduction, and the screen anti interference technique are also presented.
本文不仅介绍了检测系统的设计原理，还讨论了噪声的产生及抑制，以及屏蔽抗干扰技术的应用。
According to the spectral characteristic of the noise source, the tube-type muffler, metal-enclosure muffler, structural-type muffler can be equipped before and after the noise reduction devices.
根据声源的频谱特性在其前后配置合理的管道式消声器、金属外壳式消声器、结构式消声器作为消声降噪的措施。
Based on the analysis of vibration source, vibration transmission path and transmission characteristics, the methods of vibration isolation and noise reduction are decided.
通过分析振动的来源以及振动传递的路径和传递特性，确定了隔振降噪的方法。
The source of noise in the high pressure plunger pump is identified through frequency spectrum analysis and measurements show significant reduction of noise in the improved plunger pump.
基于高压柱塞泵噪声产生的机理分析与振动频率的计算，找出产生噪声的根源；对实验测得频谱曲线进行频谱分析表明，改进后的高压柱塞泵的噪声得到了明显地改善。
The source of noise in the high pressure plunger pump is identified through frequency spectrum analysis and measurements show significant reduction of noise in the improved plunger pump.
基于高压柱塞泵噪声产生的机理分析与振动频率的计算，找出产生噪声的根源；对实验测得频谱曲线进行频谱分析表明，改进后的高压柱塞泵的噪声得到了明显地改善。
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