摘要
为研究不同运行方式对湍流风及地震作用下海上风力机动力学响应及稳定性影响,以DTU 10 MW海上单桩式风力机为研究对象,采用p-y曲线描述桩基与海底土壤之间的相互作用,基于有限元软件Ansys建立风力机有限元模型,并对其进行结构模态、动力学及屈曲分析。结果表明:塔架模态振型以扭转和弯曲振动为主,其一阶固有频率介于理想设计区间,风轮旋转不会引发其共振;湍流风对塔顶位移影响最为显著,地震对塔顶侧向位移影响远大于湍流风;地震发生后,塔架等效应力及应变能响应均出现激增现象。启动紧急停机可有效削减塔顶位移、塔架等效应力及应变能响应峰值,降低结构损伤及塑性形变风险;湍流风及地震作用下,塔架背风面中上部将发生横向屈曲破坏。启动紧急停机可明显提高其抗屈曲能力,临界屈曲载荷最大增幅近27.11%。
In order to study the influence of different operating modes on the dynamic response and stability of offshore wind turbines under turbulent wind and earthquake,DTU 10 MW offshore single-pile wind turbine was used as the research object.The p-y curve was used to describe the interaction between the pile foundation and the subsea soil.Based on the finite element software ANSYS,the finite element model of the wind turbine was established and the structure modal,dynamics and buckling calculation of the wind turbine were carried out.The results show that the vibration mode of the tower is dominated by torsional and bending vibration.Its first natural frequency is within the ideal design range and the rotation of the wind wheel will not cause its resonance.Turbulent wind has the most significant influence on the displacement of tower top and earthquake has much greater influence on the lateral displacement of tower top than the turbulent wind.After the earthquake,the equivalent stress and strain energy response of the tower have surged.The emergency shut-down can effectively reduce the peak of the tower top displacement,the tower equivalent stress and the tower strain energy response and reduce the risk of structural damage and plastic deformation.Under the action of turbulent wind and earthquake,lateral buckling failure will occur in the middle and upper part of the leeward surface of the tower.The emergency shut-down can effectively improve its buckling resistance and the maximum increase of critical buckling load is nearly 27.11%.
作者
张立
闫阳天
李春
刘青松
王博
李志昊
ZHANG Li;YAN YangTian;LI Chun;LIU QingSong;WANG Bo;LI ZhiHao(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering,Shanghai 200093,China)
出处
《机械强度》
CAS
CSCD
北大核心
2022年第1期175-183,共9页
Journal of Mechanical Strength
基金
国家自然科学基金项目(51976131,51676131)
上海市“科技创新行动计划”地方院校能力建设项目(19060502200)资助~~。
关键词
风力机
有限元
地震
动力响应
屈曲
Wind turbine
Finite element
Earthquake
Dynamic response
Buckling
