Volume 3, Issue 3, June 2018, Page: 88-96
Acoustic Performance of Parallel Baffled Silencers Different Configurations in HVAC Channel
Antonio Petosic, Department of Electroacoustics, Faculty of EE and Computing, University of Zagreb, Zagreb, Croatia
Sanja Grubesa, Department of Electroacoustics, Faculty of EE and Computing, University of Zagreb, Zagreb, Croatia
Mia Suhanek, Department of Electroacoustics, Faculty of EE and Computing, University of Zagreb, Zagreb, Croatia
Ivan Djurek, Department of Electroacoustics, Faculty of EE and Computing, University of Zagreb, Zagreb, Croatia
Received: Aug. 27, 2018;       Accepted: Sep. 7, 2018;       Published: Oct. 27, 2018
DOI: 10.11648/j.eas.20180303.14      View  412      Downloads  21
Abstract
Serious noise pollution is one of the most unwanted consequences of the rapid urbanization and industrialization and various studies have shown that long exposure to noise can result in different health issues. Therefore, the performance of large industrial baffled silencer is crucial for reducing the environmental noise from large industrial plants. In this particular research the acoustic parameters of several different configurations of parallel baffled silencers have been compared by using an in-situ measurement method according to the ISO-11820:1996 Standard. The geometrical parameters e.g. length, thickness and distance between baffles as well as the absorption parameters of baffles have been changed in terms of full absorption and half-absorption surface. Furthermore, their influence on the silencer performance in channel with and without flow has been measured. Transmission and insertion loss acoustic parameters in octave frequency bands from 63 Hz up to 16 kHz are determined in the in-situ measurement setup including the influence of the reflections from baffles at the inlet side and opening at the outlet side. Moreover, the analytical expression (Piening and trapezoidal equation) for one parallel baffled silencer’s configuration has been compared with the measurement values on octave bands of interest. Additionally, the sound pressure distribution between baffles has also been measured and it can be concluded that the sound pressure level change is much larger at the beginning when compared to the value at the end of a silencer.
Keywords
Parallel Baffled Silencers, Insertion Loss, Transmission Loss, Artificial Sound Source, Real Sound Source
To cite this article
Antonio Petosic, Sanja Grubesa, Mia Suhanek, Ivan Djurek, Acoustic Performance of Parallel Baffled Silencers Different Configurations in HVAC Channel, Engineering and Applied Sciences. Vol. 3, No. 3, 2018, pp. 88-96. doi: 10.11648/j.eas.20180303.14
Copyright
Copyright © 2018 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Reference
[1]
EN ISO 11820:1996, Acoustics- measurement of silencers in situ.
[2]
ISO 7235-2003, EN ISO 7235:2009 Acoustics -- Laboratory measurement procedures for ducted silencers and air-terminal units -- Insertion loss, flow noise and total pressure loss.
[3]
F. P. Mechel: Theory of baffle-type silencers. Acustica 70 (1990) 93-111.
[4]
H. V. Fuchs: Schallabsorber und Schalldämpfer, Springer Verlag, 2010.
[5]
M. L. Munjal: Acoustics of Ducts and Mufflers, 2nd Edition, 2014.
[6]
David A. Bies, Colin H. Hansen: Engineering Noise Control: Theory and Practice, Fourth Edition, 2009.
[7]
F. P. Mechel: Numerical results to the theory of baffle type silencers. Acustica 72 (1990) 7-20.
[8]
A. Cummings and N. Sormaz: Acoustic attenuation in dissipative splitter silencers containing mean fluid flow. Journal of Sound and Vibration 168 (1993) 209-227.
[9]
R. Kirby: The influence of baffle fairings on the acoustic performance of rectangular splitter silencers. J. Acoust. Soc. Am. 118 (2005) 2302-2312.
[10]
R. Binois, E. Perrey-Debain, N. Dauchez, Benoit Nennig, J.-M. Ville, et al.: On the efficiency of parallel baffle-type silencers in rectangular ducts: prediction and measurement. Acta Acustica united with Acustica, Hirzel Verlag, 2015, 101, pp. 520-530.
[11]
Helmut V. Fuchs: Grundlagen der SchalldämpferauslegungTeil 1: Vereinfachte Formeln für sichere Dimensionierung, IKZ-FACHPLANER Heft12/2007.
[12]
VDI 2081:2001, Blatt1, Blatt2, Noise generation and noise reduction in air conditioning systems.
[13]
ISO 3744:2011, Acoustics -- Determination of sound power levels and sound energy levels of noise sources using sound pressure -- Engineering methods for an essentially free field over a reflecting plane.
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