新型重力式海上风力机基础结构动力特性分析  

DYNAMIC CHARACTERISTIC ANALYSIS OF NEW TYPE GRAVITY INFRASTRUCTURE FOR OFFSHORE WIND TURBINE

作　　者：练继建[1] 燕翔[1] 王海军[1] 

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津300072

出　　处：《太阳能学报》2016年第6期1624-1630,共7页Acta Energiae Solaris Sinica

基　　金：国家高技术研究发展(863)计划(2012AA051702);国家创新研究群体科学基金(51021004);天津市应用基础及前沿技术研究计划(青年基金)(12JCQNJC04000)

摘　　要：提出一种新型海上风力机重力式基础结构形式,介绍其构造与特点。以5 MW风力机为例建立该新型基础及上部结构的整体有限元模型,进行自振特性与地震响应分析,并重点讨论环境水体对结构动力特性的影响。结果表明:1)该新型结构,塔筒柔而基础刚,形成"二元"刚度体系;2)考虑环境水体作用的结构自振频率较未考虑水体作用时小,且振型中的水体淹没部位参与越多,自振频率的减小越显著;3)因水体"附加质量"效应,水下结构地震反应增强,水上结构则不然,其反应略微减小。建议进行重力式海上风力机基础的抗震设计时,应考虑环境水体影响,否则计算偏于危险。A new type gravity infrastructure for offshore wind turbine was proposed, and the structure and characteristics were described. A finite element model of the infrastructure and the superstructure of 5 MW wind turbine was established to analyze the natural vibration characteristics and the seismic response, and the effect of environmental water body on the dynamic characteristics of the structure was emphatically discussed. The results show that the new type structure with the soft tower and the rigid foundation forms the ＇ two-part＇ stiffness system ; The natural frequency of the whole structure considering the function of water body is lower than that of no considering the effect of the water body, and the modes is more in water body, the reduction of natural frequency is more significant ; The seismic response of structure under water is significantly enhanced as ＇ additional mass＇ effect of water body, and the seismic response of structure above water is slightly reduced. It is suggested that the effect of environmental water body must be considered for seismic design of gravity infrastructure for offshore wind turbine, otherwise the results may lean to danger.

关 键 词：海上风力机 重力式基础 动力特性 地震响应 流固耦合 

分 类 号：TK8[动力工程及工程热物理—流体机械及工程]