目前表示机器噪声值有二种方式:①测量距机器主体表面一定距离的声(压)级;②测得平均声(压)级后再通过计算求得该机器的声功率级.以前木工机床的噪声测量是采用第一种方法.由于声(压)级与测量距离有很大关系,因此这种方法测量所得结果不尽合理,使得国内外同类产品不能互相类比,非同类产品更不能互比.声功率法避免了这种局限性,它客观 At present, there are two ways of expressing the noise value of the machine: ① measuring the sound pressure level at a certain distance from the surface of the machine body ② measuring the sound power level of the machine after calculating the average sound pressure level, Of the noise measurement is the first method.As the sound pressure level and measuring distance has a great relationship, so this method of measurement results are not reasonable, so that similar products at home and abroad can not be compared with each other, non-similar products can not each other Acoustic power method to avoid this limitation, it is objective