基于多维AR模型的近海风机振动特性  

Vibration characteristic of offshore wind turbine based on multi-variate Auto-Regressive model

作　　者：龙丽吉[1,2] 康海贵[1] 高鑫林 

机构地区：[1]大连理工大学建设工程学部,辽宁大连116024 [2]重庆交通大学西南水运科学研究所国家内河航道整治工程技术中心,重庆400016 [3]中交二航局第二工程有限公司,重庆401121

出　　处：《中国港湾建设》2015年第3期9-13,共5页China Harbour Engineering

基　　金：国家自然科学基金资助项目(41206075)

摘　　要：基于自然风特性,通过考虑结构结点间风速时程的空间相关性,采用多维AR模型模拟海上风机塔架脉动风荷载时程。在考虑桩-土-风机塔架系统相互作用的基础上,建立了三维有限元模型,分析了风机结构的固有频率及模态振型,对比研究了在不同方向风荷载作用下结构的位移、应力时程。结果表明:虽然不同入射风向对塔筒顶端的位移极值影响不大,但对局部位移和最大应力有显著的影响,结构应力的极值点出现在桩基与塔筒的连接段上。研究结果可为海上风机三桩基础布置、桩基承载力设计、结构强度设计、风机塔架的抗风提供参考。Based on the natural wind properties and the correlativity of nodal wind speed time history, a multi-variate Auto-Regressive（AR） model was simulated the time history of fluctuating wind. The pile-soil-wind turbine tower interaction, 3D finite element models are established to studied natural frequencies and modal shapes. Research the time-history of displacement and stress response are comparatively studied with different wind incident angle. The results show that the wind-incident has no significant influence on the displacement of the tower top, but has significant influence on local displacement and maximum stress, the maximum stress are observed at the connection section between pile and wind turbine tower. The results provide reference for pile arrangement, pile bearing capacity design, structural strength design, wind-resistant design of wind turbine tower.

关 键 词：AR模型 随机风场模拟 动力响应 桩-土-风机塔架系统 

分 类 号：U655.544.1[交通运输工程—港口、海岸及近海工程] TU473.12[交通运输工程—船舶与海洋工程]