气动手工具的噪声主要产生于排气的空气动力性噪声,其声功率与排气出口速度的八次方成正比.因此,降低排气速度是控制气动工具噪声的主要途径.气动手工具噪声的峰值频率在4～8kHz左右(图1).由于结构紧凑、体积小,机内空间有限,因此,对这类工具多不采用抗式消声器,而采用阻性消声的方案;在机内消声确实有困难或达不到降噪量要求时,可考虑选用机外 The noise of pneumatic hand tools is mainly generated by the aerodynamic noise of the exhaust gas, whose sound power is proportional to the eighth power of the exhaust outlet velocity. Therefore, reducing the exhaust velocity is the main way to control the noise of pneumatic tools. The peak frequency of about 4 ~ 8kHz (Figure 1). Due to the compact structure, small size, limited space within the machine, so more for such tools without muffler, and the use of resistive muffler program; within the machine Noise reduction is indeed difficult or less than the required amount of noise reduction can be considered outside the machine