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.
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