漂浮式海上风力机全机结构自振特性仿真  

Simulation Study on Dynamic Characteristic of Floating Offshore Wind Turbine Systems

作　　者：柯世堂[1] 胡丰[1] 曹九发[1] 王同光[1] 

机构地区：[1]南京航空航天大学江苏省风力机设计高技术研究重点实验室,南京210016

出　　处：《南京航空航天大学学报》2015年第4期595-601,共7页Journal of Nanjing University of Aeronautics & Astronautics

基　　金：国家重点基础研究计划("九七三"计划)(2014CB046200)资助项目;国家自然科学基金(51208254)资助项目;江苏高校优势学科建设工程资助项目;江苏省自然科学基金(BK2012390)资助项目;中国博士后科学基金(2015T80551)资助项目

摘　　要：针对漂浮式海上风力机全机结构的动力特性问题,以某3 MW漂浮式海上风力机系统为例,基于有限元方法分析了系统自振频率和振型的分布特征,并进行漂浮式海上风力机全机自振特性的参数分析,最后给出全机结构基频和倾覆频率的计算公式。分析表明,漂浮式海上风力机系统自振频率非常低且分布密集。系统基频与拉索锚固深度以及叶片长度呈线性递减关系,与浮筒半径呈反比,与拉索的总截面面积以及塔架高度呈二次曲线关系。倾覆频率与参数的关系则牵涉高次项,较上述关系更为复杂。文中给出的拟合公式计算值与有限元值吻合较好,说明其在预测漂浮式海上风力机系统自振频率方面具有较高可信度。In order to study the natural vibration characteristics of floating offshore wind turbine systems, the finite element method is used. Taking a 3 MW floating offshore wind turbine for example, the dis- tribution of mode shapes and the parameter analysis of the natural frequencies and are investigated. The calculation equations used to estimate the fundamental frequency and the overturning frequency are fitted based on a series of parametric analyses. The results show that the fundamental frequency is directly proportional to the anchorage depth of the inhaul cable and the blade length, and inversely proportional to the buoy radius. The fundamental frequency also has a quadratic relationship with the total cross-sec- tional area of the inhaul cable and the tower height. The relationship between the overturning frequency and parameters involves high-order term, so it is more complicated. The good agreement between the results from the fitting equation and the results from the finite element method indicates that the fitting equation has a high credibility in predicting the natural frequencies of floating offshore wind turbines.

关 键 词：漂浮式海上风力机 有限元方法 自振频率 参数分析 拟合公式 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程] TU279.7[建筑科学—建筑设计及理论]