Abstract: The theory and practice of traditional active vibration isolation based on force actuator have been studied widely, but the capacity of force actuator limits the use of piezoelectric element in the active vibration isolation. The active-flexible-isolation system which is constructed by piezoelectric elements bonded on an elastic element with certain shape has the advantages of both passive isolation element and active isolation. The model of the active-flexible-isolation system is established based on the index of isolation system and the self-ability of active-flexible-isolation. The application framework of feedforward control and feedback control in the active-flexible-isolation is analyzed. The Z shape active-flexible-isolation system which adopts piezoelectric elements bonded on the flexible element as actuators and sensors to detect the capacity of the isolation system and uses acceleration signal as the index of isolation system has been experimented. The experimental results show vibration can be suppressed by feedforward control and feedback control.

Key words: Feedback control, Active vibration isolation, Active-flexible-isolation system, Feedforward control, Piezoelectric elements