The Calculation Method and the Test for Radiated Sound Power of Impulsive Noise in a Reverberant Tank

Abstract

A method for calculating the radiated sound power of impulsive noise in a reverberant acoustic field is proposed in this paper, and the computing results of the time-frequency domain characteristic are verified in the tank at ASTL (Acoustic Science and Technology Laboratory). In the frequency domain analysis, the power spectrum of the impulsive noise is processed by the Welch way. In the time domain analysis, the total sound power of the impulsive noise is calculated by the autocorrelated processing, and by which the radiated sound power is reduced. In order to verify the proposed method, the radiated sound power of the impulsive noise is successfully tested in a reverberant tank. The experiment result shows that the radiated sound power of the 10 kHz CW impulsive noise signals in the testing tank is almost as same as that in the anechoic pool, which the testing deviation is less than 1 dB both in time and frequency domain. The work of this paper provides a useful calculation method for measuring the characteristic of the transient noise in a reverberant tank.