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近海风机叶片模态局部化产生机理及定量分析研究
Research on the mechanism and quantitative analysis of mode localization of offshore wind turbine blades
投稿时间:2018-12-20  修订日期:2019-03-03
DOI:
中文关键词:  风机叶片  模态局部化  失谐  局部因子  失谐度  模态密集度  模态置信准则
英文关键词:wind turbine blade  mode localization  mistuning  mode localization factor  degree of mistuning  intensive degree of mode  mode assurance criterion  
基金项目:基于非线性瞬时模态与模态局部化的近海风机叶片损伤机理、识别与监测研究
作者单位E-mail
张永朋 大连理工大学 1187451213@qq.com 
李东升 汕头大学 dsli@dlut.edu.cn 
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中文摘要:
      在摄动理论的基础上,结合失谐度、模态密集度以及模态置信准则对模态局部化的产生机理做了定量描述,并用26自由度弹簧质点结构验证了其可行性。其次,用ANSYS建立了风机叶片模型,并通过改变单元的密度和弹性模量模拟了四种失谐情况,发现风机叶片刚度和质量的小量失谐也会对其模态振型产生显著的影响,同时通过定义新的模态局部因子来定量描述风机叶片结构的模态局部化程度。最后,对风机叶片失谐振型中谐调振型的成分进行了分析,研究表明,其成分越复杂,模态局部化程度也越强。
英文摘要:
      The mechanism of mode localization is described quantitatively using the degree of mistuning,the intensive degree of mode and mode assurance criterion based on the perturbation theory. The feasibility of this method is verified by a 26 degree-of-freedom spring-mass system. Then the finite element model of wind turbine blades is established by ANSYS software, and four mistuning cases are simulated by changing the density and elastic modulus of certain blade elements. The study proves that small mistuning of stiffness and mass has great impacts on the modes of wind turbine blades. Meanwhile, a new factor is proposed to quantitatively measure the degree of mode localization of the wind turbine blades. Finally,the composition of mistuning modes which is constituted by harmonic mode are analyzed. Research shows that the more complex the composition of mistuning modes,the stronger the degree of mode localization.
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