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Structural Engineering and Mechanics Volume 65, Number 5, March10 2018 , pages 513-521 DOI: https://doi.org/10.12989/sem.2018.65.5.513 |
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Resonant response of spar-type floating platform in coupled heave and pitch motion |
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E.Y. Choi, J.R. Cho and W.B. Jeong
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| Abstract | ||
| In this paper, the resonance response of spar-type floating platform in coupled heave and pitch motion is investigated using a CPU time-effective numerical method. A coupled nonlinear 2-DOF equation of motion is derived based on the potential wave theory and the rigid-body hydrodynamics. The transient responses are solved by the fourth-order Runge-Kutta (RK4) method and transformed to the frequency responses by the digital Fourier transform (DFT), and the first-order approximation of heave response is analytically derived. Through the numerical experiments, the theoretical derivation and the numerical formulation are verified from the comparison with the commercial software AQWA. And, the frequencies of resonance arising from the nonlinear coupling between heave and pitch motions are investigated and justified from the comparison with the analytically derived first-order approximation of heave response. | ||
| Key Words | ||
| spar-type floating platform; heave and pitch motions; coupled nonlinear equations; coupled resonance response; resonance frequencies; first-order approximation | ||
| Address | ||
| E.Y. Choi: KFX Airframe Analysis Team, Korea Aerospace Industries, Sacheon 52529, Republic of Korea J.R. Cho: Department of Naval Architecture and Ocean Engineering, Hongik University, Sejong 339-701, Republic of Korea W.B. Jeong: School of Mechanical Engineering, Pusan National University, Busan 609-735, Republic of Korea | ||