风浪作用下海上风电结构动力响应数值仿真
Numerical Simulation of Dynamic Response of Offshore Wind Power Structures under Wind Wave Action
郝学思 1罗先启1
作者信息
- 1. 上海交通大学船舶海洋与建筑工程学院,上海 200240
- 折叠
摘要
为了能够更好利用海洋资源,提高发电效率,提出了风浪作用下海上风电结构动力响应数值仿真方法.建立波动力平衡方程获取海波谱,计算出风场平均波高与周期.利用离散频谱逼近目标随机过程,用互功率频谱密度矩阵求拟脉动风场的风速时程曲线,将平均风速和谐波叠加风速相加,得到单位高度风荷载.按照拟层流风波产生机理,构建波浪谱模型,采用莫里森公式计算结构波浪荷载,考虑风浪间的相关性,将波浪参数代入风浪谱,得到风电结构响应数值.通过仿真得出在不考虑波面高度变动的情况下,波面力在波峰处被低估,在波谷处被高估,波面高度的变化会对风电结构动态响应产生一定影响,得出结果可以为保障电能效益提供参考.
Abstract
In order to make better use of marine resources and improve the efficiency of power generation,this ar-ticle put forward a numerical simulation method for the dynamic response of offshore wind structures in wind action.Firstly,the wave force balance equation was constructed to obtain the sea wave spectrum,and then the average wave height and period of the wind field were calculated.Secondly,the discrete frequency spectrum was used to approximate the random process of the target.Meanwhile,the mutual power spectral density matrix was used to solve the time-history curve of wind speed of the quasi-turbulent wind field.The mean wind speed and harmonic superim-posed wind speed were added together to obtain the wind load per unit height.According to the quasi-laminar wind-induced wave generation mechanism,a wave spectrum model was constructed,and then the wave load was calculated using the Morison formula.Based on the correlation between wind and wave,the wave parameters were substituted into the wind-wave spectrum to obtain a numerical response of the wind structure.The following conclusions can be drawn from the simulation results.If the wave surface height change is not considered,the wave surface force is undervalued at the wave crest and overestimated at the wave trough.In addition,the change of wave surface height will have a cer-tain impact on the dynamic response of the wind power structure.The results can provide a reference for ensuring en-ergy efficiency.
关键词
风浪作用/海上风电结构/动力响应数值/随机耦合/海波谱模型Key words
Wind wave action/Offshore wind structure/Dynamic response value/Random coupling/Sea wave spectrum model引用本文复制引用
出版年
2024
NETL
NSTL
万方数据