Estimation of sound power of centrifugal machines based on sound intensity measurements

Abstract

Sound power level is the main characteristic when we want to determine noise of machine and we made acoustic calculation. From the measurement results we see, that using the method of sound intensity for definite sound power in real conditions we get exactly results as in the case of sound pressure level methods. When we measure a sound intensity we define direction of noise radiated and the influence of separate mechanisms of machine on a total sound power level, what is very important for reduction of a noise.