Vibration and sound radiation of a double-plate system
Keywords:
acoustic impedance, acoustic radiators, ships, variational techniques, vibrations, ship structures, sound radiation, double-plate system, mechanical impedances, variational method, arbitrary boundary conditions, point-masses, stiffeners, four-pole network approach, effect of structural changesAbstract
The authors deal with the vibrations of a combined system and the sound radiation of the bottom plate when the top plate becomes excited by a point force in low- and mid-frequency ranges. In order to reduce the size of the linear system to be solved, the structure is divided into six sub-structures which are the two plates and the four suspensions and for which mechanical impedances must be determined. The mechanical impedances of both plates were obtained from a variational method general enough to include arbitrary boundary conditions, point-masses and stiffeners on either plate. The mechanical impedances of the suspensions were calculated with a four-pole network approach. The model is used to investigate the efficiency of suspensions and the effect of structural changes on either plate in order to minimize the radiated power
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