Abstract
Wind turbine structures may fail in harsh sea conditions. Among these failures, mooring line failure not only affects the dynamic response of the faulty wind turbine but also increases the risk of collision between the faulty wind turbine and other offshore structures. Therefore, it is important that investigate the impact of mooring line failure and its mitigation measures. The platform motions and structural loads induced by mooring line failure were compared with the normal operating conditions. The study indicated that mooring failure increased the platform surge and sway motion. In addition, the dynamic responses of the wind turbine under wind load alone were studied after mooring failure. It was found that the wind load was the primary factor influencing platform displacement and structural loads after mooring failure. To reduce wind load influence, the emergency shutdown was chosen as a mitigation measure. Meanwhile, the impact of pitch rate and braking time on structural loads and platform displacements was discussed. It was found that the structural loads were the smallest when pitching (pitch rate of 4 deg/s) and braking started at the same time. The platform motions were most stable when pitching (pitch rate of 8 deg/s) and braking started simultaneously.
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