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前 言 活塞式空气压缩机是一种广泛应用于各个工业领域的通用机械。众所周知,它也是工业噪声的主要噪声源之一。特别是它的进气口噪声,由于呈明显的低频特性,传播较远,对环境的影响特别明显。一般情况下,进气口噪声比机壳辐射噪声要高10～20dB（A）。如用C声级评价则高达30dB以上。有关资料表明,在距离大型空压机50m远的地方其噪声有66dB（A）[1],可见其噪声的影响程度。
Piston air compressor is a widely used in various industrial fields of general machinery. It is well known that it is also one of the major noise sources for industrial noise. Especially its inlet noise, due to the obvious low frequency characteristics, spread far, the impact on the environment is particularly evident. Under normal circumstances, the air intake noise than the enclosure radiation noise 10 ~ 20dB (A). Such as the use of C-level evaluation is as high as 30dB or more. Relevant data show that noise is 66dB (A) [1] at a distance of 50m from a large air compressor, showing the influence of noise.