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一、前 言 无论是压缩机或其他一般机械,减少噪音并不是机械本身所要达到的目的。例如,空气压缩机压缩空气并把压缩空气供给风动工具是其目的。因此,压缩机不论是在矿山或者是在城市工厂使用,只要使用目的相同,所要求的性能（排气量、排气压力等）也就相同。但是,所产生的噪音大小,则根据时间和场所的不同而有不同的要求。而压缩机在运行时,没
I. Preface Whether it is compressors or other general machinery, noise reduction is not an objective of the machinery itself. For example, air compressors compress air and supply compressed air to a pneumatic tool for this purpose. Therefore, the compressors, whether they are used in a mine or in a city factory, will have the same performance (exhaust capacity, exhaust pressure, etc.) as long as they are used for the same purpose. However, the amount of noise generated may vary depending on the time and location. The compressor is running, no