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,并通过改变材料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。
The mechanism of mode localization is described quantitatively using the degree of mistuning,the mode density 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 material.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.
作者
张永朋
李东升
郭鑫
ZHANG Yong-peng;LI Dong-sheng;GUO Xin(College of Civil Engineering,Dalian University of Technology,Dalian 116024,China;College of Engineering,Shantou University,Shantou 515063,China)
出处
《计算力学学报》
EI
CAS
CSCD
北大核心
2020年第1期53-61,共9页
Chinese Journal of Computational Mechanics
基金
国家自然科学基金(51578107
51778103)
汕头大学科研启动基金(NTF18012)
大连理工大学海岸和近海工程国家重点实验室开放课题基金(LP1907)资助项目.
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
wind turbine blade
mode localization
mistuning
mode localization factor
degree of mistuning
intensive degree of mode
mode assurance criterion
