导管架式海上风力发电支撑结构振型扩阶方法  

Mode Shape Expansion for Jacket-Type Support Structure of Offshore Wind Turbine

作　　者：李炜[1] 王卫英[2] 刘福顺[3] 陈文文[3] 彭春涪 卢洪超[3] 

机构地区：[1]中国水电顾问集团华东勘测设计研究院,浙江杭州310014 [2]青岛理工大学工程质量检测鉴定中心,山东青岛266033 [3]中国海洋大学工程学院,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2014年第3期98-101,117,共5页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(51279188;51009124;41206075);华东院院立项课题项目(KY2011-02-07-02;KY120228-03-06)资助

摘　　要：提出1种适用于海上风力发电支撑结构的模态振型扩阶方法。该方法无需借助转换矩阵实现振型扩阶,而是依靠实测模态并通过修正有限元模型对应振型在未测试自由度的振型值而获得空间完备的模态振型,并且所发展的方法在一定程度上可以忽略有限元模型存在的建模误差,是1种直接的估算方法,计算效率相对较高。文中采用三桩导管架式海上风力发电支撑结构验证提出方法的正确性以及在低阶模态振型扩阶上的优越性。数值结果表明,该方法对传感器位置、数量依赖程度低,尤其对于海上风电结构,仅在结构的水深较浅部位布置少数传感器即可比较精确的实现低阶模态振型扩阶,具有良好的工程应用前景。A mode shape expansion method was proposed for jacket-type support structure of offshore wind turbine. And in this method, the unmeasured mode shape values were corrected by a series of mode- shape factors base on measured information, which was different from traditional methods, which employ transformation matrix for model reduction and modal expansion. The proposed method was a non-iterative technique which had better accuracy for high order mode shape expansion By neglecting modeling errors between the finite element model and the real structure. A tripile jacket-type support structure of offshore wind turbine was established and used to demonstrate the developed method. Numerical studies indicate that proper spatially complete mode shapes can be obtained even when only limited sensors are assembled at the positions with shallow water depth, including high order mode shapes compared with Guyan technique.

关 键 词：模态振型 模态扩阶 导管架 海上风电 空间完备中图法 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程]