期刊
JOURNAL OF SOUND AND VIBRATION
卷 463, 期 -, 页码 -出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jsv.2019.114963
关键词
Wave finite element; Sound transmission; Honeycomb-cored panels; Guyan reduction; Group velocities; Modal densities
资金
- China Scholarship Council [201406050038]
- New Zealand Ministry of Business, Innovation and Employment (MBIE) through a Smart Ideas Grant entitled Predicting Sound Transmission in Lightweight Buildings
For vibroacoustic analysis, honeycomb-cored panels are often modelled as homogenised solid plates, which involves various assumptions and approximations. In this paper, a wave and finite element (WFE) based modelling strategy is proposed to predict sound transmission through honeycomb-cored panels. In this method, a three-dimensional periodic cell of the structure is modelled using a conventional finite element (FE) method. Due to the complexity of the core geometry, the FE model can contain a large number of internal nodes. Guyan reduction is used to reduce the model size. The in-vacuo wavenumbers are found, and from them the group velocities and modal densities determined. Wave propagation in the fluids surrounding the structure is modelled analytically. The acoustic loading is modelled using equivalent external nodal forces. The relatively small-sized mass and stiffness matrices are then post-processed using periodicity theory and equilibrium conditions. An accurate homogenised model is developed for calculating the structural response to acoustic excitation. Excitation of the structure by oblique plane waves and a diffuse sound field are both considered. Various numerical examples are presented to illustrate this model. The homogenised model developed in this paper is general and accurate, and can model sound transmission through honeycomb-cored panels of any configurations. (C) 2019 Elsevier Ltd. All rights reserved.
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