The laser vibrometer based on the surface vibration for measuring and analyzing the radiating noise of the 4120SG diesel engine is proposed.

以4120SG柴油机为研究对象，提出基于激光测振的表面振动法测量柴油机辐射噪声。

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In this paper, spectrum analysis is carried out for 4102Q diesel engine to investigate the effect of parameters adjustment on noise emission, and to determine its noise sources.

本文通过对4102Q型柴油机噪声的频谱分析与研究，了解该型柴油机参数调整对噪声的影响；

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So flow in diesel engine affects dynamic performance, fuel economy, burning noise and emission formation etc, moreover directly affects reliability and durability of diesel engine.

因此，柴油机的流动不仅关系到柴油机的动力性、经济性、燃烧噪音和有害废气生成，而且还直接影响到柴油机的可靠性和耐久性。

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