考虑风荷载与冰荷载联合作用对大型单桩海上风电机组的影响,基于IEA 15 MW超大型单桩海上风电机组,采用一体化分析软件Openfast建立风冰联合作用下大型单桩耦合数值模型,开展超大型单桩海上风电机组在风冰联合作用下的动力响应分析。探究不同加载时长、冰激振动模型以及疲劳损伤组合方法对大型单桩海上风电机组的动力响应规律。计算结果显示：不同冰载数值计算模型塔基与泥面线载荷的计算结果差别较大,泥面线受冰荷载影响较大,同时泥面线位置较塔基位置承受更大的疲劳损伤,应重点关注。采用不同的荷载组合方向进行泥面线与塔基位置的疲劳损伤估计时,计算结果较风冰联合作用下疲劳损伤相对误差较大。因此,宜采用风冰联合加载的方法进行大型单桩海上风电机组的动力响应模拟,进而开展超大型单桩海上风电机组的疲劳损伤估计。
Abstract
Considering the combined effect of wind load and ice load on large single-pile offshore wind turbine, based on IEA 15 MW offshore wind turbine, coupled numerical model under the ice and wind condition is developed using the Openfast code. This paper carries out the dynamic analysis of a large monopile offshore wind turbine under the wind and ice interaction and explores the influence of different loading time durations, ice models, and different damage evaluation methods on the characteristics of the structural responses. The calculation results show that there is a great difference between the calculation results of the numerical calculation models with different ice loads on the tower and the mud surface line. The fatigue damage rate at the mudline is higher than that at the tower base, which should be paid more attention to. When the traditional load combination method is used to calculate the fatigue damage rate of wind turbine structure, the fatigue damage rate is smaller than that under the combined action of wind and ice, and the fatigue damage is underestimated. Therefore, the coupled wind-ice-structure analysis is recommended to estimate the fatigue damage for large monopile offshore wind turbines.
关键词
海上风电 /
支撑结构 /
数值分析 /
冰激强迫振动 /
疲劳损伤
Key words
offshore wind turbines /
supporting structure /
numerical analysis /
ice induced vibration /
fatigue damage
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基金
国家自然科学基金（52071058; 52071301）; 辽宁省兴辽英才计划（XLYC1807208）; 中央高校基本业务科研费（DUT20ZD219）
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