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提出了将智能材料粘贴在叶片表面或嵌入叶片内部形成新结构的概念。本文将智能材料作为传感器和作动器,通过机电耦合抑制叶片的振动;利用有限元软件Algor分析在气动力作用下叶片的应力、应变;基于压电陶瓷第一压电方程,将风电叶片简化成柔性悬臂梁,建立了压电智能悬臂梁状态空间的动力学模型;针对此系统利用最优控制理论进行主动振动控制,设计了在系统低阶模态空间的振动控制器。最后通过计算机仿真得出:系统振动幅度缩小了约20%,振动时间减少了约80%,从而说明了此主动振动控制方法的有效性和可行性,对防止叶片这一弹性体发生颤振也起到一定的作用。
The concept of attaching a smart material to the surface of a blade or inserting it into a blade to form a new structure is proposed. In this paper, the smart material is used as a sensor and actuator to suppress the vibration of the blade through electromechanical coupling. The stress and strain of the blade under aerodynamic force are analyzed by finite element software Algor. The wind turbine blade is simplified based on the first piezoelectric equation Into a flexible cantilever beam, the dynamic model of the piezoelectric smart cantilever beam is established. According to this system, the active vibration control is carried out by using the optimal control theory, and the vibration controller in the low-order mode space of the system is designed. Finally, the computer simulation results show that the vibration amplitude of the system is reduced by about 20% and the vibration time is reduced by about 80%, which proves the effectiveness and feasibility of the active vibration control method. Play a role.