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Date of Publication:2014-01-01

Journal:声学学报

Volume:39

Issue:1

Page Number:59-67

ISSN No.:0371-0025

Abstract:Based on the modal interaction method, this study presents a
   structural-acoustic coupled model of a rectangular enclosure consisting
   of two flexible panels on opposite sides of the enclosure. A simplified
   relationship between the panel parameters and the NVH responses of the
   coupled system is derived. Using this modal, parametric studies aiming
   at reducing the total weight of the structure and simultaneously
   improving the NVH performance are conducted for cases of single flexible
   panel-single excitation (SPSE), dual flexible panel-dual excitation
   (DPDE) and dual flexible panel-single excitation (DPSE). For the SPSE
   and DPDE cases, it is found that in the low frequency range the sound
   level inside the cavity is most sensitive to the panel thickness, then
   to the panel modulus, and nearly independent of the material density. It
   is therefore concluded that a panel with larger thickness but lighter
   material may be able to reduce the structural weight and low frequency
   sound level simultaneously. For the DPSE case, proper lightweight design
   can enhance the coupling effect between the motions of the two flexible
   panels in certain frequency range, especially around the lower order
   modes of the panels and the cavity. This leads to both reduced modal
   response levels and pressure within the acoustic cavity. For mid to high
   frequencies, increasing the thickness and density of the panels is
   beneficial for all three cases in terms of reducing the noise level
   inside the cavity.

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