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1．噪声的主要危害噪声污染不仅对人们的自我感觉和工作能力产生消极的影响,而且能导致健康严重失调、疲劳、早期失聪、高血压、神经疾病等。 2．车用发动机噪声的形成与对策发动机噪声主要包括燃烧噪声、机械噪声、进排气噪声、冷却风扇及其他部件发出的噪声。燃烧噪声是在可燃混合气体燃烧时,因气缸内气体压力急剧上升冲击发动机各部件,使之振动而产生的噪声。柴油中的十六烷值不合适或喷油时间过于提前,会引起发动机工作粗暴,使噪声急剧增大。汽油机由于过热、汽油品质不良和点火提前角过大等原因造成高频爆炸声、敲缸。
1. The main hazards of noise Noise pollution not only has a negative impact on people’s self-perception and ability to work, but also can lead to serious health disorders, fatigue, early deafness, high blood pressure, neurological diseases. 2. Engine noise formation and countermeasures Engine noise includes combustion noise, mechanical noise, noise into the exhaust, cooling fan and other components of the noise. Combustion noise is a noise generated when a combustible mixture gas is burned and vibrates due to a sharp increase in gas pressure in the cylinder, which impairs various parts of the engine. Inadequate cetane number or diesel fuel injection time is too early, will cause rough engine work, so that the sharp increase in noise. Gasoline due to overheating, poor gasoline quality and ignition lead angle is too large and other reasons caused by high-frequency explosions, knocking cylinder.