| 中文摘要 |
本研究以NEMOH求解器與WEC-SIM模組化系統為基礎探討OC3-Hywind風機在波浪作用下之動態響應模擬，其中邊界元素法是依據線性繞射理論（Linear Diffraction Theory）求解繞射／輻射問題（diffraction/radiation problem），並以cummins time-domain equation建立時程領域計算模式。為了比較離岸風機在作業海域之波浪環境與水深影響，在此利用反應振幅因子（response amplitude operator, 簡稱RAO）來估算出在不同波浪環境下風機的運動反應。由於RAO的峰值處即代表風機與波浪的共振週期，且直接影響風力發電機的穩定度與安全性。因此藉由探討共振情況下的受力情形，即可知道風機運動所產生之錨鏈力對於風機之影響，結果可提供設計風機錨鏈系統之參考依據。而為了避免風機產生過大的運動量，錨鏈系統是以準靜態模式（quasci-static state）來估算繫纜對於風機動態的限制作用，最後比較各類程式對於OC3-Hywind風機在極端條件下（如暴風）之模擬結果。在本研究中，模組化設計系統由於具有實驗設計（design of experiment）之優點，在結合不同尺寸、外型、搭載之錨鏈系統後，將可探討在不同海況條件下，浮式風機在單一自由度或多個自由度耦合下之運動反應。
This study discusses the real-time motion responses of OC3-Hywind spar 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, the Cummins time-domain equation is adopted by solving the governing equations in 6 Degrees-of-Freedom (DOF) motions. Besides, an indicator, Response Amplitude Operator (RAO), is considered to realize the resonance period of OC3-Hywind spar by performing regular wave simulations at various frequencies. Since the RAO peak corresponds to the resonance period of OC3-Hywind spar, it can be used to estimate the spar’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 wind float in large motion responses. By comparing our model results with other published results of OC3-Hywind spar, it is verified that the calculation of hydrodynamic coefficients and related motion responses is reliable. Eventually, this study would provide a valuable concept in modular designs and help realize hydrodynamic characteristics of wind floats in engineering practice. |
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