近海风力机的模态分析  

Modal Analysis of Offshore Wind Turbines

作　　者：程友良[1] 李帅领 周彬 渠江曼 CHENG Youliang;LI Shuailing;ZHOU Bin;QU Jiangman(School of Energy,Power and Mechanical Engineering,North China Electric Power University,Baoding 071003,Hebei Province,China)

机构地区：[1]华北电力大学能源动力与机械工程学院

出　　处：《动力工程学报》2019年第11期934-939,共6页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金重点资助项目(11232012);中央高校基本科研业务费专项资金资助项目(2016XS107)

摘　　要：为了得出无预应力条件下1.5 MW风力机整机的自振频率,采用有限元方法对简化后的海上风力机塔架和桩基耦合结构进行固有特性分析,得出了无预应力条件下该耦合系统的自振频率,输出其低阶振型图和相应的模态振型曲线,根据Campbell图与外界激励频率(即风轮额定1P、3P和6P)进行对比,判断其是否会在外界激励条件下发生共振,得出该风力机风轮运转的临界转速和运行的安全区。最终得出风力机整机的模态分析。结果表明:整机的模态振型在塔架与桩基耦合结构的振型基础上出现了摆振和挥舞的复合运动,整机的固有频率与实体的静态特性频率较相近。To obtain the natural frequencies of a 1.5 MW wind turbine without prestressing force, a natural vibration analysis was conducted on the simplified coupled structure of its tower and pile foundation using finite element method, and subsequently the natural frequencies of the coupled system without prestressing force were obtained, while the low-order vibration patterns and corresponding modal shape curves were output, which were then compared with the external excitation frequencies, i.e. rated 1 P, 3 P and 6 P of the wind turbine based on Campbell diagram, to estimate whether resonance occurs under external excitation conditions, and to find the critical speed and safety zone of the wind turbine. Finally, modal analysis results were obtained for the whole wind turbine. Results show that compound movements of swing and brandishing appear in the vibration mode of the whole machine based on the mode of the coupled structure entity of the tower and pile foundation, and the natural frequencies of the whole machine are close to the static characteristic frequencies of the entity.

关 键 词：近海风力机 有限元分析 固有特性 模态分析 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程]