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Dissipative Silencers Based on Micro-Perforated Plates
Technical Paper
2013-24-0071
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Micro-perforated plates (MPP:s) can be defined as a perforated plate where the hole impedance is dominated by viscous losses. This will always be true for sufficiently low frequencies or small holes. In addition for a standard MPP the perforation ratio is chosen so that the normalized acoustic resistance is between 1-2, which yields optimum damping for incident plane waves. Historically MPP:s have been used as panel absorbers to reduce reflections in rooms and enclosures. More recently the potential for machinery and vehicle applications has come into focus, e.g., dissipative exhaust silencers. Some advantages offered by a MPP solution, when compared to traditional dissipative silencers, are that it can reduce the weight and the problem with fibre breakout. In this paper the work on cylindrical MPP dissipative silencers at KTH is summarized. One important question being how an optimum damping is achieved, for a certain frequency band and for a given volume (length & area ratio) of the silencer.
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Authors
Citation
Abom, M. and Allam, S., "Dissipative Silencers Based on Micro-Perforated Plates," SAE Technical Paper 2013-24-0071, 2013, https://doi.org/10.4271/2013-24-0071.Also In
References
- Maa , D.-Y. 1998 Potential of Microperforated Panel Absorber J. Acoust. Soc. Am. 104 5 2861 2866
- Guo Ying , Allam Sabry and Åbom Mats 2008 Micro-perforated plates for vehicle applications Inter-Noise 2008 Shanghai-China
- Allam Sabry and Åbom Mats 2008 Experimental Characterization of Acoustic Liners with Extended Reaction 14th AIAA/CEAS Aeroacoustics Conference Vancouver-Canada
- Allam , S. , Guo , Y. , and Åbom , M. Acoustical Study of Micro- Perforated Plates for Vehicle Applications SAE Technical Paper 2009-01-2037 2009 10.4271/2009-01-2037
- Allam Sabry and Åbom Mats 2011 A New Type of Muffler Based on Microperforated Tubes ASME-Journal of Vibration and Acoustics 133 June 2011
- COMSOL MULTIPHYSICS ver. 3.5a Acoustics Module