柴油机噪声的大小是由进气空气动力性噪声和机体表面机械振动辐射的噪声所决定的。柴油机机体表面振动辐射的噪声即谓机械噪声,而进气机构辐射的噪声则是特殊的噪声源。因此,在推导柴油机空气声的计算式时,应把这两种声源分开来研究。作者对国产四冲程柴油机的研究得出了机械噪声的总声级与综合参数 A 的关系。综合参 The size of the diesel engine noise is determined by the aerodynamic noise of the intake air and the noise radiated by the mechanical vibration of the body surface. The noise emitted by the vibration of the diesel engine body surface is mechanical noise, and the noise radiated by the air intake mechanism is a special noise source. Therefore, when deriving the calculation formula for diesel air sounds, these two sound sources should be studied separately. The author’s research on domestic four-stroke diesel engine has obtained the relationship between the total sound level of mechanical noise and the comprehensive parameter A. Comprehensive reference