A smart material made by piezoelectric ceramics to have the function of both the sensor and actuator is developed for vibration suppression. Unlike the passive method that implements suitable components to modify the structural effect of equivalent mass, damping, or stiffness etc. under a known and defined condition, this smart material is designed with the capability of self-detecting and self-actuating so that it can actively damp variant changing vibrations. Interdigital electrode method is used to make the smart material in order to enhance the sensitivity and the piezoelectric strain effect for the sensor and actuator. Polarized electric field of the interdigital electrode influential to the performance is investigated in particular. Various smart materials and thickness affecting polarized electric field of the interdigital electrode is studied and evaluated by ANSYS analysis. Dynamic modeling by using finite element method and Hamilton theory is derived for both the sensor and actuator. Internal model control structure is used for vibration control design. Predictive control method based on finite-element dynamic modeling is developed. Moving optimization method is also used to deal with the uncertainties of the environment so that the robustness of the device is improved. Practical experiment is carried out for performance evaluation.

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