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http://dx.doi.org/10.3795/KSME-A.2012.36.7.789

Underwater Structure-Borne Noise Analysis Using Finite Element/Boundary Element Coupled Approach  

Lee, Doo-Ho (Dept. of Mechanical Engineering, Dongeui Univ.)
Kim, Hyun-Sil (Acoustic Group, Korea Institute of Machinery & Materials)
Kim, Bong-Ki (Acoustic Group, Korea Institute of Machinery & Materials)
Lee, Seong-Hyun (Acoustic Group, Korea Institute of Machinery & Materials)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.36, no.7, 2012 , pp. 789-796 More about this Journal
Abstract
Radiated noise analysis from a ship structure is a challenging topic owing to difficulties in the accurate calculation of the fluid-structure interaction as well as owing to a massive degree of freedom of the problem. To reduce the severity of the problem, a new fluid-structure interaction formulation is proposed in this paper. The complex frequency-dependent added mass and damping matrices are calculated using the high-order Burton-Miller boundary integral equation formulation to obtain accurate values over all frequency bands. The calculated fluid-structure interaction effects are added to the structural matrices calculated by commercial finite element software, MSC/NASTRAN. Then, the impedance and underwater radiation noise due to an excitation of structure are calculated. The present formulation is applied to a ship to calculate the underwater radiated noise.
Keywords
Underwater Radiated Noise; Foundation Impedance; Finite Element/Boundary Element Coupled Approach; Fluid-Structure Interaction Problem;
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