Preliminary acoustic performance investigation of concentric-tube perforated muffler design
Keywords:Acoustics, Attenuation, Computer simulation, Mathematical models, Resonators, Acoustic attenuation, Perforated muffler, Transmission loss (TL)
AbstractTwo impendence models based on the theoretical and empirical results are compared using a one dimensional segmentation method to explore the differences in predicted transmission loss (TL) of a concentric-tube perforated muffler with zero mean flow. Simulations demonstrate that perforated tube mufflers have better acoustic attenuation properties than simple expansion chamber mufflers. These perforated tube elements are widely used in resonators and mufflers to attenuate exhaust system noise. The physical segmentation or simplification of the perforated tube includes the effect of perforation in each segment, which is considered as a branch with a solid tube connecting the branches of each adjoining segment. A one dimensional segment model is compared with Ricardo WAVE, a commercial software modeling package. Results show that large discrepancy in prediction of transmission loss is found between the WAVE for a large perforated muffler configuration.
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