Comparative study of end correction models in case of extended tube expansion chamber muffler

Abstract

Extended tube expansion chamber muffler is a modified version of the simple expansion chamber muffler, used to get better muffling of noise. End correction applied to the length of expansion chamber may give precise value of transmission loss. Number of end correction models are put forth by eminent researchers for predicting the behaviour of mufflers. A comparative study of these models is done in this paper for lab grade mufflers using simulation, as it being a powerful technique for analyzing muffler parameters. The response of three mufflers having different areas of cross section is investigated for transmission loss using MATLAB as a simulation tool and compared with and without end correction. The necessity of consideration of end correction factor and the importance of simulation tool as method for non-destructive testing are underlined by the results.