Impact of draft and ballast on acoustic and vibration characteristics of double-walled cylindrical shell
A vibration and acoustic radiation model for finite-length double-walled cylindrical shells under different draft and ballast conditions is established using the finite element method.Considering the balance between gravity and buoyancy,the ballast is divided into fixed ballast and ballast water parts.The mean square vibration level,sound power level,and far-field sound pressure directivity of the double-walled cylindrical shell structure are calculated,revealing the influence of draft and ballast on its acoustic and vibration characteristics.Research results indicate that,in the low-frequency range,the draft significantly influences the vibration characteristics and sound power of the cylindrical shell.At high frequencies,there is no apparent effect on vibration due to the draft.However,the sound power increases with an increase in draft.Ballast and annular fluid contribute to vibration reduction and noise reduction in the high-frequency range,and the distribution of ballast has a significant impact on the structural acoustic and vibration characteristics.
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