寒区海上风电基础锥体动冰荷载

为了明确有冰海域加锥风电基础结构的动冰荷载模型,通过寒区风电基础锥体结构现场观测得到的海冰破碎特征数据,研究了随机动冰荷载模型在风电基础结构上的适用性；基于现场观测数据发现冰力周期和冰力幅值均服从正态分布。通过对海上风电结构及油气平台等不同尺寸锥体上测量数据的分析,建立了平均冰力周期和冰厚、冰速参数之间的关系式,对比实测周期,两者基本吻合。同时确立了平均冰力幅值与极值静冰力之间的关系,建立了锥体随机动冰荷载模型。结合此风电基础现场实测的海冰数据,模拟动冰荷载并施加到有限元模型中,对比数值分析结果与实测的结构响应加速度,结果表明两者在时域和频域上均吻合较好。可见构建的随机动冰荷载模型能够用于分析加锥风电结构抗冰性能。

Study on Dynamic Ice Load of Conical Offshore Wind Turbine Foundation in Cold Region

In order to clear the dynamic ice load model of offshore wind turbine (OWT) foundation in ice region, the applicability of random dynamic ice load model in OWT structures have been studied by combining the observation phenomenon of ice broken character on cones with different sizes of structures in this paper. Based on the field monitoring data, it is found that the ice broken period and ice force amplitude obey normal distribution. Based on the analysis of obtained data on cones with different sizes of OWTs and oil and gas platforms, the relationship between average ice force period and ice thickness and ice velocity parameters is established. Comparing the measure ice force period and the period calculated by this formula, it is found that the calculated data agree with the measured data basically. At the same time, the relationship between average ice force amplitude and ultimate ice force is established. and the random dynamic ice force model for cone structures is established. Based on the measured data obtained from OWT structure, the random dynamic ice force is simulated and applied to the finite element model of this structure. Comparing the numerical results with the measured response acceleration of offshore wind turbine, it is found that both of them are in good agreement in time domain and frequency domain. It shows that the random dynamic ice force model established in this paper can be used to evaluate the ice resistance performance of OWTs installed cones.