SEPARATION OF THE CONTRIBUTIONS OF "OWN" AND "SHIFT" NOISE AND DETERMINATION OF GAS-DYNAMIC AND ACOUSTIC PARAMETERS OF SILENCERS

This article presents the results of calculations of acoustic and gas-dynamic parameters of silencers of various design designs. The calculations are based on the developed methods [1, 2]. 8 types of exhaust noise mufflers of various design designs were selected for the calculations. The article contains calculated values of the following parameters: the range of gas flow velocities at the muffler outlet pipe, m/s; pressure range, Pa; temperature range, K and acoustic power values, dB. Radiation patterns with the values of the "own" and "shift" noise parameters are presented. The separation of "own" and "shift" noise is performed. The data of comparative results of experimental and numerical parametric studies are presented; satisfactory comparative results are obtained. The influence of individual design parameters (the volume of the silencer, the presence of perforation) on the acoustic efficiency of silencers is analyzed. The mechanisms of noise reduction and ways to improve their designs are shown.