Abstract
In this paper, the BEM impedance-to-scattering matrix method is used to predict the transmission loss (TL) of large dissipative silencers with a rectangular cross section. Of particular interest are the tuned dissipative silencers and the bar silencers commonly used in the power generation industry. A tuned dissipative silencer incorporates a mix of lined resonators of various sizes to target certain different frequency ranges. Its internal geometry is quite complex but usually has a certain repeating pattern. On the other hand, the bar silencer has a relatively uniform internal geometry. The direct mixed-body BEM with the substructuring technique can be used for both types of silencers. The impedance-to-scattering matrix method developed recently has the ability to include higher-order propagating modes at the large inlet and outlet for TL computation. Results from the proposed method are compared to the TL curves from a "lumped four-pole matrix" approach, in which simple averages are taken for sound pressures at the inlet and the outlet, respectively, to form an equivalent four-pole matrix for TL computation.
Original language | English |
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State | Published - 2015 |
Event | 44th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2015 - San Francisco, United States Duration: Aug 9 2015 → Aug 12 2015 |
Conference
Conference | 44th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2015 |
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Country/Territory | United States |
City | San Francisco |
Period | 8/9/15 → 8/12/15 |
Bibliographical note
Publisher Copyright:© 2015 by ASME.
ASJC Scopus subject areas
- Acoustics and Ultrasonics