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The acoustic parameters (sound power level and radiation efficiency) of harmonically excited natural fiber (Luffa cylindrica) reinforced polymer composite panel is predicted first time using a coupled finite and boundary element scheme including the mechanical characteristics. First, the frequency values of the freely vibrating Luffa fiber-reinforced composite are obtained through a finite element solution considering the higher-order polynomial kinematic theory to count the structural deformation. Further, the Helmholtz wave equation is solved to evaluate the acoustic data under the harmonic excitation. The proposed multiphysics model is taking care of the structure, the fluid medium and the coupling between them, which, in turn, allows to obtain the solution numerically for the final finished polymer composite product. Further, the model accuracy has been shown by comparing both frequency and sound radiation responses with available published results including the own experimental values. Moreover, the fruit extracted fiber reinforced polymer composite plate components are fabricated using different volume fractions of fiber content and utilized for the numerical analysis considering their experimental properties (mechanical and physical). Finally, the influences of the dimensional variable (aspect ratio, side to thickness ratio and support condition) on the acoustic radiation behavior of the fabricated composite have been examined thoroughly to show their possible real-life applications.

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