| 摘 要： | By using the concept of complex sound intensity,the rotationalcharacter of the active sound intensity which is the real component of thecomplex sound intensity is descussed in this paper.It is shown that it isthe irrotational component of the active sound intensity that transferssound energy in sound field.When sound power is measured with thetwo-microphone technique,the rotation of the active sound intensity hasan effect on it.Because the irrotational component of the active sound in-tensity depends only on the surface sound intensity,measuring the surfacesound intensity can avoid the effect of the rotation.Based on atuo-powerspectra,formulas about the surface sound intensity are given in thispaper,providing a theoretical basis for measuring the surface soundintensity.
|
