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各种运转机械都是振源,也都是噪声源。有振动存在的场合,一般均伴随有噪声产生。从对人体的作用上说,振动给人以身体的感受,而噪声则是人耳听力上的感受;从动力媒介上看,振动是通过固体传播的,而噪声则是借助空气传播的。机械振动派生噪声有几种途径:由振动着的机器本体、管路等直接对外放射噪声,这是空气噪声的主要来源;机器的振动由联接的基础、结构等在固体中以弹性波形式传播,并且由结构表面向外辐射结构噪声,此即一次固体声;空气噪
A variety of operating machinery are vibration sources, are also sources of noise. There are occasions when there is vibration, usually accompanied by noise. From the role of human body, vibration gives the feeling of the body, while noise is the human ear’s hearing sense; from the dynamic medium, the vibration is transmitted through the solid, and the noise is transmitted through the air. There are several ways to derive noise from mechanical vibrations: external noise is radiated directly from the vibrating machine body, piping, etc., which is the main source of airborne noise; vibration of the machine is propagated as elastic waves in the solid by the foundations, structures, etc. , And structural noise is radiated outward from the surface of the structure, that is, a solid sound; air noise