Steel and Composite Structures

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Evaluation of vibroacoustic responses of laminated composite sandwich structure using higher-order finite-boundary element model

  • Sharma, Nitin (School of Mechanical Engineering, KIIT) ;
  • Mahapatra, Trupti R. (Department of Production Engineering, VSSUT) ;
  • Panda, Subrata K. (Department of Mechanical Engineering, NIT) ;
  • Mehar, Kulmani (Department of Mechanical Engineering, NIT)
  • Received : 2018.03.18
  • Accepted : 2018.06.23
  • Published : 2018.09.10
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Abstract

In this paper, the vibroacoustic responses of baffled laminated composite sandwich flat panel structure under the influence of harmonic excitation are studied numerically using a novel higher-order coupled finite-boundary element model. A numerical scheme for the vibrating plate has been developed in the frame work of the higher-order mid-plane kinematics and the eigen frequencies are obtained by employing suitable finite element steps. The acoustic responses are then computed by solving the Helmholtz wave equation using boundary element method coupled with the structural finite elements. The proposed scheme has been implemented via an own MATLAB base code to compute the desired responses. The validity of the present model is established from the conformance of the current natural frequencies and the radiated sound power with the available benchmark solutions. The model is further utilized to scrutinize the influence of core-to-face thickness ratio, modular ratio, lamination scheme and the support condition on the sound radiation characteristics of the vibrating sandwich flats panel. It can be concluded that the present scheme is not only accurate but also efficient and simple in providing solutions of the coupled vibroacoustic response of laminated composite sandwich plates.

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References

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