Research on vibration and acoustic radiation of the submerged complicated shell structure with multiple excitations

In order to evaluate the structural vibration and the acoustic radiation of underwater complicated shell structure with multiple excitations,a complicated multiple compartment shell structure,similar to real ships,is designed and the underwater vibration and acoustic radiation experiments with single and multiple excitations are implemented. The experimental results show that sound pressure caused by multiple excitations can be approximated as the incoherent superposition of those caused by each excitation separately.The transfer relations between the vibro-acoustical characteristics of the structures and the excitations are deduced analytically.The rationality and the error of the incoherent superposition are analyzed as well.It is indicated the incoherent superposition method can be used to calculate the vibration and sound radiation of the complicated shell structure with multiple excitations,and it has important significance to predict the real vibration response and acoustic field.