Abstract
This paper presents a prediction technique for wave propagation in muffler using Boundary Element Method (BEM). The results of the numerical calculation are compared with the plane-wave theory and also the experimental results. It is shown that at high frequencies the plane-wave theory does not yield correct results due to the occurrence of two- and three-dimensional wave motion. On the other hand, the BEM is able to predict the acoustic wave behavior in the high frequencies where the planewave theory fails.
The BEM uses a multi-domain technique to model complex mufflers, which may consist of cavities, tubes, perforates, and porous materials. Contour plots of sound pressure level inside the mufflers obtained from the BEM results are used to illustrate the principle of sound cancellation and to visualize the wave propagation behavior.
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Author Profile Benjamin Soenarko: He graduated from the Institute of Technology Bandung (Institut Teknologi Bandung, Indonesia), Department of Engineering Physics, in 1972. He pursued his graduate study in Mechanical Engineering with specialty in acoustics at the University of Kentucky, USA, in 1979. He received the M.S. degree in 1980 and the Ph.D. degree in 1983. Dr. Soenarko served as Secretary for Academic Affairs of the Department of Engineering Physics from 1977-1979 and Chairman of the Department of Engineering Physics during 1986-1992. His current research interest includes signal processing in the measurement of acoustic materials, computational methods in acoustics, particularly Boundary Element Method. He has belonged to the Acoustics and Building Physics group of the Department of Engineering Physics, Institute of Technology Bandung, since 1972. He is now a professor at the Department of Engineering Physics.
Andrew F. Seybert : He is professor of Mechanical Engineering at the University of Kentucky where he has been a faculty member since 1977. He received the B.S. degree from the University of Cincinnati and the M.S. and Ph.D. degrees from Purdue University. His research specialization is acoustics and vibrations. He is a Fellow of the Acoustical Society of America. At the University of Kentucky he has served as Director of Graduate Studies for the Department of Mechanical Engineering and Chair of the Mechanical Engineering Department from 1988-94. During 1994-95 He spent a sabbatical year at the Technical University of Berlin. In 1996 He helped organize the Vibro-Acoustics Consortium, a group of companies interested in the development and use of noise prediction technology. He has served as Vice-President of the ASME Noise Control and Acoustics Division and was Program Chairman for the 1994 Winter Annual Meeting. He is a registered Professional Engineer in the states of Kentucky and Ohio.
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Soenarko, B., Seybert, A.F. Visualization of wave propagation in muffler. J Vis 3, 229–235 (2000). https://doi.org/10.1007/BF03181845
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DOI: https://doi.org/10.1007/BF03181845