Accession Number : ADA267483


Title :   An Efficient Model for Coupling Structural Vibrations with Acoustic Radiation


Descriptive Note : contractor rept.,


Corporate Author : INSTITUTE FOR COMPUTER APPLICATIONS IN SCIENCE AND ENGINEERING HAMPTON VA


Personal Author(s) : Frendi, Abdelkader ; Maestrello, Lucio ; Ting, Lu


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a267483.pdf


Report Date : Apr 1993


Pagination or Media Count : 27


Abstract : We study the scattering of an incident wave by a flexible panel. The panel vibration 0 in governed by the nonlinear plate equations while the loading on the panel, which is the pressure difference across the panel, depends on the reflected and transmitted waves. Two models are used to calculate this structural-acoustic interaction problem. One solves the three dimensional nonlinear Euler equations for the flow-field coupled with the plate equations (the fully coupled model). The second uses the linear wave equation for the acoustic field and expresses the load as a double integral involving the panel oscillation (the decoupled model). The panel oscillation governed by a system of integro-differential equations is solved numerically and the acoustic field is then defined by an explicit formula. Numerical results are obtained using the two models for linear and nonlinear panel vibrations. The predictions given by these two models are in good agreement but the computational time needed for the 'fully coupled model' is 60 times longer than that for 'the decoupled model' ... . Coupling, Acoustic radiation, Structural vibration, Linear, Nonlinear.


Descriptors :   *VIBRATION , *ACOUSTIC WAVES , *STRUCTURAL RESPONSE , *ACOUSTIC SCATTERING , *SUPERSONIC FLIGHT , RADIATION , AIRCRAFT , MODELS , DISPLACEMENT , THREE DIMENSIONAL , PRESSURE , WAVE EQUATIONS , COUPLINGS , ACOUSTIC FIELDS , OSCILLATION , EULER EQUATIONS , DIFFERENTIAL EQUATIONS , AEROSPACE CRAFT , PLATES , FLOW FIELDS , INTEGRALS , PANELS , INTERACTIONS , PREDICTIONS , SCATTERING


Subject Categories : Aerodynamics
      Acoustics


Distribution Statement : APPROVED FOR PUBLIC RELEASE