Structural Engineering and Mechanics

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Vibro-acoustic analysis of un-baffled curved composite panels with experimental validation

  • Sharma, Nitin (School of Mechanical Engineering, KIIT University) ;
  • Mahapatra, Trupti R. (School of Mechanical Engineering, KIIT University) ;
  • Panda, Subrata K. (Department of Mechanical Engineering, NIT Rourkela)
  • Received : 2017.04.29
  • Accepted : 2017.07.16
  • Published : 2017.10.10
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Abstract

The article presents the vibration and acoustic responses of un-baffled doubly curved laminated composite panel structure under the excitation of a harmonic point load. The structural responses are obtained using a simulation model via ANSYS including the effect various geometries (cylindrical, elliptical, spherical and hyperboloid). Initially, the model has been established by solving adequate number of available examples to show the convergence and comparison behaviour of the natural frequencies. Further, the acoustic responses are obtained using an indirect boundary element approach for the coupled fluid-structure analysis in LMS Virtual.lab by importing the natural frequency values. Subsequently, the values for the sound power level are computed using the present numerical model and compared with that of the available published results and in-house experimentally obtained data. Further, the acoustic responses (mean-square velocity, radiation efficiency and sound power level) of the doubly curved layered structures are evaluated using the current simulation model via several numerical experimentations for different structural parameters and corresponding discussions are provided in detail.

Keywords

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