Research on Prediction Method of Low-frequency Radiated Sound Power of Underwater Shell Structure
Aiming at the prediction of low-frequency radiated sound power of underwater shell model,a method combining single cylinder field separation technique in wave number domain and supersonic acoustic intensity is proposed to predict the radiated sound power of underwater cylindrical structure.First,complex sound pressure and radial vibration velocity are obtained from the structure's near-field cylindrical single holographic surface in a non-silent-sounding pool,and sound waves propagating outward are obtained through the single cylinder field separation technology.The evanescent wave in the outward propagating sound wave is filtered by supersonic acoustic intensity to obtain the propagating wave components that can be transmitted to the far field,and then the far-field radiated sound power of the shell is predicted.The prediction results are compared with the free field radiated sound power,and the effectiveness of the method in predicting the radiated sound power of the underwater cylindrical structure is verified.The factors affecting the accuracy of the prediction results are analyzed,and the applicable conditions of the prediction method are explored.The results show that the research content of this paper has certain engineering application significance for the prediction of low-frequency acoustic radiation of cylindrical structure in the acoustic pool,and has a guiding role for vibration and noise reduction.
low frequency radiated sound powersingle-cylinder sound field separationsupersonic acoustic intensitypropagating wave
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