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Acoustic Characteristics of Coupled Dissipative and Reactive Silencers
Technical Paper
2003-01-1643
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The acoustic characteristics of a hybrid silencer consisting of two dissipative chambers and a Helmholtz resonator are investigated first computationally and experimentally. Complex wave number and characteristic impedance are used for the dissipative chambers to account for the wave propagation through absorbing material. Three-dimensional boundary element method (BEM) is employed to predict the transmission loss in the absence of mean flow and the predictions are compared with the experimental results obtained from an impedance tube setup. Noting that the long connecting tube between acoustic elements may reduce the transmission loss near the resonance frequency, two alternative hybrid silencers with short connecting tubes are also investigated by BEM. The present study shows the effectiveness of hybrid silencers over a wide frequency range and demonstrates the importance of understanding each acoustic element, as well as their interaction in designing silencers.
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Citation
Lee, I., Selamet, A., and Huff, N., "Acoustic Characteristics of Coupled Dissipative and Reactive Silencers," SAE Technical Paper 2003-01-1643, 2003, https://doi.org/10.4271/2003-01-1643.Also In
SAE 2003 Transactions Journal of Passenger Cars - Mechanical Systems
Number: V112-6; Published: 2004-09-15
Number: V112-6; Published: 2004-09-15
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