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Analytical Modelling of Vibroacoustic Interaction for Conjugate Enclosures

Lookup NU author(s): Xi Ji, Professor Cheng Chin


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In the marine and offshore structures, large numbers of compartments enclosed by thin steel plates are rigidly connected which leads to unwanted efficient vibration energy transmission and structure-borne noise radiation in the compartments. In such circumstance, fluid cavity and structures are fully coupled in the dynamic behavior. This paper presents a complete analytical solution for the vibroacoustic characteristics of conjugate enclosures filled with fluid. By considering of the structural interconnection force and the moment at edges, and structural-acoustic interaction on the interface, the energy functions of the coupled system are developed. The Chebyshev expansions solutions are obtained according to the Lagrangian theory. Reliability of current method are validated by checking Eigen frequencies of present methodology against those available in the literature or derived from finite element software. The inherent principle of velocity continuity on the panel-cavity interface enables both the light and heavy fluid cavity problem to be handled satisfactorily. The present method offers a unified procedure for a variety of cases since the modification of any parameter from one case to another is simple and requires no changes to the solution procedure.

Publication metadata

Author(s): Ji X, Chin CS

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: INTER-NOISE 2017, the 46th International Congress and Exposition on Noise Control Engineering

Year of Conference: 2017

Pages: 1-8

Acceptance date: 01/06/2017