This paper presents a study on the linear compensation of the nonlinear hysteretic piezoelectric ceramic actuators. The strain feedback control both with the strain guage and the self-sensing techniuqe control are investigated. In the case with strain guage, the srain of the actuator is measured directly by the strain gauge, which is fed back to the input voltage to the actuator to decrease the hysteretic loop of the output displacement. For the self-sensing control, the strain of the actuator is measured by the voltage generated due to the piezoelectric effect. In this technique, the piezoelectric actuator is modeled by a combination of a capacitor and a voltage generator. The voltage caused by the piezoelectric effect is detected via a bridge circuit. The measurement is then used as a feedback signal to compensate the nonlinear actuator for the linear output. The experimental results show that the hysteretic loop on the displacement of the actuator is improved more efficiently for the self-sensing feedback control. Further, it is shown that the compensator for the self-sensing is simple and needs no additional external sensing devices.
展开▼
