摘要
针对大型风力机叶片的颤振问题,提出将约束阻尼结构应用于叶片以增大其结构阻尼。基于能量法建立局部约束阻尼叶片的动力学模型,推导出结构损耗因子的表达式;根据模态应变能分布情况确定约束阻尼层的敷设位置,并参数化分析阻尼层与约束层厚度对模态损耗因子的影响,采用混合单元法建立某型1.5 MW风力机阻尼叶片三维有限元模型;通过Newmark直接积分法对普通叶片及阻尼叶片在额定风速和极限风速下的动力响应进行仿真对比。结果显示,与普通叶片相比,约束阻尼结构叶片在两种风速下叶尖挥舞和摆振方向的位移、加速度标准差均减小50%以上,可显著提高叶片的抑颤能力。
In order to overcome the flutter problem of large scale wind turbine blade, the constraint damping structure is applied to the blade for increasing structural damping. The dynamical model of local constraint damping blade is established based on energy method to derive the expression of structural loss factor. The laying position of constraint damping layer is determined based on the distribution of modal strain energy. Parametric analysis of the effects of damping layer and constrained layer thickness on modal loss factor is carried out. Then three-dimensional finite element model of certain type 1.5 MW wind turbine damping blade is established by using the mingle unit method. The dynamic responses of ordinary blade and damping blade under rated wind speed and limit wind speed are simulated numerically by the Newmark direct integration method. The results show that compared with ordinary blade, the standard deviations of displacement and acceleration of blades with constrained damping structure at both wind speeds in flapping and swinging direction of blade tip are reduced by more than 50%, which can significantly increase the flutter suppression ability of blade. The research results can provide reference for the flutter control of large scale wind turbine blade.
作者
孙大刚
赵树萍
孟杰
宋勇
李占龙
Sun Dagang;Zhao Shuping;Meng Jie;Song Yong;Li Zhanlong(School of Mechanical Engineering, Taiyuan University of Scienee and Technology, Taiyuan 030024, Chin)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2018年第4期1165-1172,共8页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(51305288)
太原科技大学博士启动基金(20122050)
关键词
风力机
叶片
阻尼约束结构
抑颤
wind turbines
blades
damping
constraint structure
flutter suppression
