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《Ocean Technology》 2007-03
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Study on the Acoustics Scattering of a Submerged Stiffened Cylindrical Shell Structure

GUO Xin-yi,MA Li,WU Guo-qin(Institute of Acoustics,Chinese Academy of Science,Beijing 100080,China)  
This paper introduces the use of the finite element/boundary element method for analysis of the acoustics scattering of submerged stiffened cylindrical shell structures.The structure is excited by incident wave and radiates energy.The sound field totals incident field and scattering field.Base on the Mindlin theory,forced vibration finite element model of the structure is established,and then the finite element method is used to calculate the dynamic surface response of a structure.Base on the theory of boundary element method in acoustics,using the dynamic surface response of a structure calculates the scattering field.The result of this study show that the back scattering of structure without stiffened is stronger than stiffened one,in the same wave number;stiffened structure scattering directivity patterns has more distinct bifurcation;with the increasing in wave number,the back scattering intensity gradually increases,and the forward scattering intensity gradually diminish.
【CateGory Index】: O427.2
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