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A bilateral piezoelectric stack actuator (BPSA) is introduced, and its actuated property is also analyzed. Usually, a piezoelectric stack can only undertake significant compressive loads but cannot tolerate tension, while this new actuator is able to generate obvious bilateral actuated outputs. The actuated principle of the new actuator is analyzed firstly. The linear and nonlinear models are also built up. The latter is to analyze the piezoelectric hysteresis based on the classical Preisach model. Moreover, the effect of the preload on the actuator is considered. By comparison with the experiment results, the Preisach model is valid for the present actuator. [ABSTRACT FROM AUTHOR]

An active vibration control scheme was proposed based on Macro Fiber Composite (MFC) actuators for the bending and torsional vibration control of large flexible lightweight wing structures. Firstly, a finite element modeling and modal analysis of a flexible wing are carried out. Further, the number, type, and location distribution of the MFC actuators bonded on the supported beam of the wing are designed. Then, the actuated characteristics of the two kinds of MFC actuators required for bending and torsional vibration controls was theoretically analyzed. The simulation model of the overall vibration control system was also finally obtained. Finally, through ANSYS simulation analysis, the vibration control effect of the current control system on the first two-order low-frequency modal response of the wing structure is given. The simulation results show that the proposed active vibration control scheme has specific feasibility and effectiveness. [ABSTRACT FROM AUTHOR]