一、前言目前机床噪声声功率级测量是按现行国家标准GB4215-84“金属切削机床声功率级测定”进行的。但是,由于用测量声压级的方法来测量和计算声功率级,受到环境条件的限制,所以这种测量方法带有局限性。随着数字信号处理技术和计算机的发展,国际上已推出了应用数字滤波或FFT技术所研制的声强测量仪器。同时,声强法测量声 I. Introduction At present, the machine noise sound power level measurement is carried out according to the current national standard GB4215-84 “metal cutting machine sound power level measurement ”. However, this method of measurement has limitations due to the limitation of the environmental conditions due to the measurement and calculation of the sound power level by the method of measuring the sound pressure level. With the development of digital signal processing technology and computer, the sound intensity measuring instrument developed by using digital filtering or FFT technology has been introduced internationally. At the same time, sound intensity measurement sound