Structural Engineering and Mechanics

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Resonant response of spar-type floating platform in coupled heave and pitch motion

  • Choi, E.Y. (KFX Airframe Analysis Team, Korea Aerospace Industries) ;
  • Cho, J.R. (Department of Naval Architecture and Ocean Engineering, Hongik University) ;
  • Jeong, W.B. (School of Mechanical Engineering, Pusan National University)
  • Received : 2017.04.14
  • Accepted : 2017.10.28
  • Published : 2018.03.10
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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.

Keywords

Acknowledgement

Supported by : Korea Institute of Energy Technology Evaluation and Planning (KETEP), Hongik University

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