| Summary: | 碩士 === 國立成功大學 === 系統及船舶機電工程學系 === 104 === This study studies the real-time motion responses of OC3-Hywind spar floating platform in waves based on the modular design system, composed of NEMOH and WEC-SIM. In the time-domain simulation, both of the radiation and the diffraction method are used to obtain the hydrodynamic forces from frequency-domain Boundary Element Method (BEM) solver. In order to simulate the system dynamics of OC3-Hywind spar floating platform, the Cummins time-domain equation is adopted by solving the governing equations in 3 Degrees-of-Freedom (DOF) motions, including surge, heave, pitch. Besides, an indicator, Response Amplitude Operator (RAO), is considered to realize the resonance period of OC3-Hywind spar floating platform by performing regular wave simulations at various frequencies. Since the RAO peak corresponds to the resonance period of OC3-Hywind spar floating platform, it would be considered as a predominant parameter relating to the designs of safety and stability, and it can be used to estimate the floating platform’s response to waves in case of the mooring system. Subsequently, the results present that the quasi-static mooring system is applicable to the estimation of mooring forces as well as the restriction of the floating platform in motion responses. By comparing our model results with other published results of OC3-Hywind spar floating platform, it is verified that the calculation of motion responses is reliable. Eventually, this study would provide a modular calculation process and help realize hydrodynamic characteristic of wind float’s platform in engineering practice.
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