床面冲刷对海上风机自振频率影响研究  

Effect of bed scour on natural vibration frequency of offshore wind turbines

作　　者：蒋林峰 吴腾[1] 吴勇 秦杰 JIANG Linfeng;WU Teng;WU Yong;QIN Jie(College of Harbor,Coastal and Offshore Engineering,Hohai University,Nanjing 210024,China;Power China Hua Dong Engineering Corporation Limited,Hangzhou 310014,China)

机构地区：[1]河海大学港口海岸与近海工程学院,南京210024 [2]中国电建集团华东勘测设计研究院有限公司,杭州310014

出　　处：《水道港口》2025年第1期134-140,共7页Journal of Waterway and Harbor

基　　金：国家自然科学基金项目(52179061)。

摘　　要：床面冲刷会导致土体对风电基础的固定能力减弱,开展冲刷对海上风机自振频率的影响研究十分必要。传统的数学模型常将上部塔筒、风机进行简化,该简化建模方式会在一定程度影响结构自振频率的计算结果。在对野外数据监测与分析的基础上,建立了包含土体-基础-塔筒-风机的海上风机整体模型。通过该模型研究了冲刷深度、冲刷坑宽度、冲刷坑坡角、冲刷坑外侧土体淤积等因素对风机结构一阶自振频率的影响规律。结果表明:冲刷深径比越大,结构的一阶自振频率越低,且冲刷初期结构自振频率下降更快;冲刷坑底宽度、冲刷坑坡角影响相对较小,在后期监测中可重点关注一倍桩径以内的土体;考虑冲刷坑两侧土体淤积的情况对结构一阶自振频率基本没有影响;数值模拟中忽略冲刷深度范围的外侧土体影响会使计算的结构自振频率偏小。The bed surface scour weakened the soil′s fixation ability to the wind turbine foundation,and the influence of scour on the natural frequency of offshore wind turbines was studied.The traditional mathematical model was often simplified by excluding the upper tower and wind turbine,which affected the accuracy of the calculated natural frequency of the structure.Based on the monitoring and analysis of field data,an overall model of offshore wind turbines,including soil,foundation,tower,and wind turbine,was established.Through this model,the effects of scour depth,scour pit width,scour pit slope angle,and soil deposition outside the scour pit on the first-order natural frequency of the wind turbine structure were analyzed.The results show that a greater scour depth-to-diameter ratio leads to a lower first-order natural frequency of the structure,with a faster decrease observed in the early stages of scour.The effects of scour pit bottom width and scour pit slope angle are relatively small,and attention is recommended for soil within one pile diameter during later monitoring.The consideration of soil deposition on both sides of the scour pit has minimal effect on the first-order natural frequency of the structure.Neglecting the influence of soil outside the scour depth range in numerical simulations results in an underestimation of the structural natural frequency.

关 键 词：海上风机 冲刷作用 自振频率 有限元软件ABAQUS 弹塑性本构模型 

分 类 号：U65[交通运输工程—港口、海岸及近海工程] TU473.1[交通运输工程—船舶与海洋工程]