前 言 当机械振动的频率在20～20000赫芝时就与噪声联系起来了。 流体机械和其他机械一样在工作中将产生振动。由机组的基础传递振动,由机组的表面向外辐射噪声。噪声在空气中的传播,可以采取隔声和吸声的办法加以控制。对由基础向外传递的振动可以采取隔振的办法加以治理。对机组表面振动辐射噪声还可以用减振的办法加以控制。另外,根据振动的模态分析理论,用 Preface When the frequency of mechanical vibration in 20 ~ 20000 Hz when the noise associated with it. Fluid machinery, like other machinery, vibrates during work. Vibrations are delivered by the foundation of the unit and radiated noise from the surface of the unit. The spread of noise in the air, you can take the method of sound insulation and sound absorption to be controlled. The vibration transmitted from the foundation to the outside can be treated as vibration isolation. On the unit surface vibration radiation noise can also be used to control the vibration damping. In addition, according to the modal analysis of vibration theory