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According to the theory of hydro-elasticity, a three-dimensional simplified model of propeller-shaft-shell is established by using three-dimensional hydro-elastic acoustic software. The sound source level curve of underwater acoustic radiation is calculated for different double shell spacing under three different excitation sources: external fluid excitation, tail-paddle excitation and internal mechanical excitation. The calculation results show that under all kinds of excitation, the total sound level of sound radiation is slightly lower than the sound level of L and 1.5L when the distance between inner and outer casings is 0.5L.

Research on the influence of underwater vehicle double shell spacing on vibration and sound radiation