Study of Radiated Sound Power and Its Sensitivity Analysis of Plate

Joint using the finite element method and acoustic radiation modal method to solve the sound power structure sheet radiation,the structure radiation sound power about the design variable sensitivity was analyzed.In the structure vibration link,surface vibration velocity was obtained using the finite element method;in the sound radiation link,the sound field information about radiation of surface vibration can be obtained by expansions of the acoustic radiation modes.For the radiation of a stiffened panel,sound power sensitivity with respect to design variable was analyzed,and the results showed that the sound power was reduced by using stiffeners when the excitation frequency was far from the natural frequency of the body,but it had negative influence and was useless by using stiffeners when the natural frequency was close to the excitation frequency.