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research-article

A two-stage model for energy transmission and radiation analysis of laminated composite double-leaf structures

[+] Author and Article Information
Atanu Sahu

Department of Civil Engineering, Jadavpur University 188, Raja S. C. Mallik Road, Kolkata 700032 India
atanush@gmail.com

Arup Guha Niyogi

Department of Civil Engineering, Jadavpur University 188, Raja S. C. Mallik Road, Kolkata 700032 India
agn_ju@yahoo.com

Michael Rose

Institute of Composite Structures & Adaptive Systems, German Aerospace Center (DLR) Lilienthalplatz 7, 38108 Braunschweig Germany
michael.rose@dlr.de

Partha Bhattacharya

Department of Civil Engineering, Jadavpur University 188, Raja S. C. Mallik Road, Kolkata 700032 India
p_bhatta@daad-alumni.de

1Corresponding author.

ASME doi:10.1115/1.4036390 History: Received August 20, 2016; Revised March 17, 2017

Abstract

A two-stage numerical model is developed to understand the energy transmission characteristics through a finite double-leaf structure placed in an infinite baffle subjected to an external excitation and subsequently the sound radiation behavior of the same into the semi-infinite receiving side. In the first stage, a mobility based coupled finite element - boundary element (FE-BE) technique is implemented to model the energy transmission from the primary panel to the secondary panel through an air-gap. In the second stage, a separate BE based model is developed to estimate the sound power radiated by the radiating (secondary) panel into the receiving side which is assumed to be semi - infinite. The advantage of the proposed approach is that it is sufficient to mesh the structural panels alone, thereby reducing the problem dimensions and the difficulty in modeling. Moreover, the developed model can be easily implemented for structures made up of various constituent materials (isotropic or laminated composites) with complex boundary conditions and varying panel geometries. Numerical experiments are carried out for different material models by varying air-gap thicknesses and also by introducing alternate energy transmission path in terms of mechanical links and the obtained results are discussed.

Copyright (c) 2017 by ASME
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