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Abstract
The general dynamic characteristics of the acoustic cavity with multiple partial partitions are presented in this thesis. A theoretical model has been developed for predictions, and several configurations are analyzed. To describe the apertures on the interface of subcavities, the virtual air panel assumption is introduced into the improved Fourier series system. The governing equations of the coupling system are derived by using the energy principle. The results obtained with the proposed model are firstly compared with the numerical calculations based on the finite element method (FEM). Subsequently, a configuration made up from a rigid cavity partitioned by a partial steel panel has been specifically built, and the forced responses of the coupling system have been measured for comparison and model validation. The present results are excellent over most of the studied frequency range. Furthermore, the visualizations of the interior sound intensity field of the acoustic cavity with three partial partitions under different frequencies are researched to illustrate the energy transmission paths and vibro-acoustic coupling mechanism of the complicated system. The obtained results are believed to be helpful in the optimal design of the vibro-acoustic coupling system with optimal sound insulation capacity.
Highlights
Flexible panel structure and acoustic cavity coupling systems can be found in various engineering fields, such as marine and astronautical engineering
The aim of this paper is to develop an analytical vibro-acoustic model of the aim of this paper is to develop an analytical vibro-acoustic model of the cavity partitioned by multiple partial partitions for attaining a deep understanding of the cavity partitioned by multiple partial partitions for attaining a deep understanding of the energy transmission mechanisms
The results suggest that theboundary proposedconditions theoretical model along the z-axisas is the
Summary
Flexible panel structure and acoustic cavity coupling systems can be found in various engineering fields, such as marine and astronautical engineering. Pan et al focused on the active control technology of the coupling systems to reduce the noise transmission through a panel into a cavity [2,3] They investigated the effect of the coupling on the medium-frequency response of the acoustic field in a panel–cavity system on the basis of the classical modal coupling method [4,5]. Xie et al presented the panel–cavity coupling system model by developing the variational method to predict the vibration and sound responses of the coupled car-like model [12] These studies were restricted to the relatively simple panel–cavity systems with the interaction between structures and acoustic fields
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