Effect of perforated sheets on rectangular silencer performance

Authors

  • R. Ramakrishnan Barman Swallow Associates, Rexdale, Ont., Canada

Keywords:

finite element analysis, noise abatement, Galerkin finite element method, perforated sheets, rectangular silencer, HVAC duct silencers

Abstract

HVAC duct silencers use porous materials such as glass wool, rock wool etc. to absorb the sound. Mathematical models for predicting the insertion loss of the silencers are a critical part of an optimum design and models to evaluate the insertion loss of absorptive rectangular silencers were developed by different researchers. The porous absorbers of the silencers are usually covered with a perforated sheet metal to protect the material from the main flow. Cummings (1976) considered the effect of the perforated sheets and showed that the effect is usually negligible. The conventional prediction methods therefore ignore the effects. The effect of the perforated sheets is considered. The effect is included in the numerical model as a jump condition. The present results are limited to rectangular silencers only. Preliminary results of a parametric study are presented

Published

1993-09-01

How to Cite

1.
Ramakrishnan R. Effect of perforated sheets on rectangular silencer performance. Canadian Acoustics [Internet]. 1993Sep.1 [cited 2021Apr.14];21(3):119-20. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/803

Issue

Section

Proceedings of the Acoustics Week in Canada