Abstract
In order to study coupling between vibration of a structure and a sound field in contact with the structure, a cavity surrounded by a rigid cylinder having thin elastic plates at both ends is adopted as an analytical model. When excitation forces of different frequencies are applied to the respective plates, the plate vibrations and the sound field inside the cavity become aperiodic, because of the coupling between the systems. In the present investigation, distribution of the sound pressure level inside the cavity is studied in detail in order to clarify the coupling behavior. The results show that when the respective plates vibrate at the same circumferential order, the vibration modes of the plates, which effect the coupling of the plate vibrations and the sound field, cause the aperiodic nature of each system to develop. In this case, since the dominant mode exists in formation of the sound field, it significantly influences the aperiodic nature of the coupling systems. In the case of vibration modes where the plates vibrate at different circumferential orders, the behaviors of the three systems, whose coupling has been restrained, approximate a steady state. Consequently, the dominant mode does not appear in the sound field.
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Hiroyuki Moriyama: He is an associate professor in Department of Prime Mover Engineering at Tokai University. He received his M.E. and Ph.D. in Mechanical Engineering from Tokai University in 1984 and 1993, respectively. His research has mainly focused on vibration and the acoustic radiation characteristics with respect to thin structures, particularly on the coupling phenomena between structural vibration and the sound field surrounding that structure. He has recently published his research results in ASJ and JSME, and is a member of VSJ, JSME, AJS, and JSAE.
Yasuhito Tabei: He was born in Gunrna, Japan on June 6, 1978. He received a B.E degree in Mechanical Engineering from Tokai University, and then studied valve gear trains with high-speed engines. He is a member of the Japan Society of Mechanical Engineering, is studying Structure vibration and Acoustics.
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Moriyama, H., Tabei, Y. Acoustic characteristics inside cylindrical structure with end plates excited at different frequencies. J Vis 7, 93–101 (2004). https://doi.org/10.1007/BF03181489
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DOI: https://doi.org/10.1007/BF03181489