CALCULATION OF NOISE IN GAS-AIR CHANNELS OF POWER OBJECTS BY THE SOURCE FUNCTION METHOD

Abstract

To design environmental protection from the noise effect of large-sized gas-air channels of power objects, it is necessary to have methods for calculating the noise inside channels, objectively assessing the processes of formation and propagation of sound energy in them. The article considers the possibility of applying for this purpose the method of the source function realizing the statistical energy model of the reflected sound field in closed air volumes. The results of an experimental estimate of the accuracy of the source function method are shown and the limits of its application for the calculation of noise in large-size gas-air channels are indicated. It is established that the source function method that realizes the statistical energy model of the reflected noise field generated in the channel gives sufficient accuracy in the case of identical sound absorption coefficients on all internal channel fences with the nature of reflection of sound from them close to diffuse reflection. In the event that sound-absorbing linings are unevenly placed on separate surfaces of the channel, a statistical energy method that takes into account the concrete placement of sound absorption in the channel should be used for noise calculations.