1.前言声功率是单位时间内以声源辐射的声能量的总和,是表示机械类等产生的噪声大小的恰当参数。声压测量时,由于随声源和测点间距离及待测声场种类而异,不适合直接表示噪声的大小,因此,在基于声压测量的声功率测量时,受到被侧声场的限制(声压法)。虽然可在某程度上进行与这种限制无关的声功率测量,但最近主要采用基于声音 1. INTRODUCTION Sound power is the sum of sound energy radiated by a sound source per unit of time and is an appropriate parameter that indicates the amount of noise generated by a machine or the like. Sound pressure measurement is not suitable for directly indicating the size of the noise due to the distance between the sound source and the measuring point and the type of the sound field to be measured. Therefore, when the sound power measurement based on the sound pressure measurement is limited by the side sound field Sound pressure method). Although acoustic power measurements unrelated to this limitation can be made to some extent, the most recent use is based on sound