Frequency-independent radiation modes of interior sound radiation: An analytical study

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• 作者：C. Hesse^a ; ^{christian.hesse@dlr.de} ; J.M. Vivar Perez^a ; M. Sinapius^b
• 关键词：Active control ; ASAC ; Radiation modes ; Fluid&ndash ; structure interaction
• 刊名：Journal of Sound and Vibration
• 出版年：2017
• 出版时间：31 March 2017
• 年：2017
• 卷：392
• 期：Complete
• 页码：31-40
• 全文大小：1002 K
• 卷排序：392

文摘

Global active control methods of sound radiation into acoustic cavities necessitate the formulation of the interior sound field in terms of the surrounding structural velocity. This paper proposes an efficient approach to do this by presenting an analytical method to describe the radiation modes of interior sound radiation. The method requires no knowledge of the structural modal properties, which are often difficult to obtain in control applications. The procedure is exemplified for two generic systems of fluid–structure interaction, namely a rectangular plate coupled to a cuboid cavity and a hollow cylinder with the fluid in its enclosed cavity. The radiation modes are described as a subset of the acoustic eigenvectors on the structural–acoustic interface. For the two studied systems, they are therefore independent of frequency.