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Forced acoustical response of a cavity coupled with a semi-infinite space using coupled mode theory
Affiliation:1. School of Mechanical and Chemical Engineering, The University of Western Australia, Crawley, WA 6009, Australia;2. Key Laboratory of Noise and Vibration Research, Institute of Acoustics, Chinese Academy of Sciences, 100190, Beijing, People’s Republic of China;1. Liver Transplantation Center, First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China;2. Key Laboratory of Living Donor Liver Transplantation, Ministry of Public Health, Nanjing, Jiangsu Province, China;1. School of Computing and Mathematics, Keele University, Keele, Staffordshire ST5 5BG, UK;2. Università degli Studi di Modena e Reggio Emilia, Dipartimento di Ingegneria Enzo Ferrari, via Vivarelli 10, 41125 Modena, Italy;1. German Aerospace Center (DLR), Institute of Composite Structures and Adaptive Systems, Lilienthalplatz 7, 38108 Braunschweig, Germany;2. Technische Universitaet Braunschweig, Institute of Adaptronic and Functional Integration, Langer Kamp 6, 38106 Braunschweig, Germany
Abstract:This paper presents a study of the forced acoustical response of an open cavity coupled with a semi-infinite space by using acoustic coupled mode theory, an approach analogous to effective non-Hermitian Hamiltonian method. The reduced differential operator of the open cavities and associated frequency-dependent basis functions are obtained in order to describe the sound field in terms of modal expansion. The properties and physical behavior of this expansion are numerically investigated and explained using computational examples.
Keywords:Open cavity  Effective non-Hermitian Hamiltonian  Coupled mode theory  Eigenmode  Modal expansion
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