抄録
In this paper, a new configuration of a direct drive valve system operated by a piezostack actuator (piezostack DDV system in short) is presented. The proposed piezostack DDV system consists of a piezostack actuator, a lever hinge mechanism, and a spool part. The piezostack actuator plays a role as an actuator for generating the actuating force, and the lever mechanism is used to amplify the displacement of the piezostack actuator. After explaining the working principle of the proposed piezostack DDV system, the governing equations of each component of the valve system are respectively obtained. Then, by integrating the mathematical models of each component, the governing equation of the whole piezostack DDV system is formulated. In the modelling, the flow force induced from the fluid flow through an effective open area of the spool valve is considered. After designing a robust sliding mode control algorithm to make the spool track the desired trajectories, the tracking control performances for the various spool position trajectories (sinusoidal and triangular signals) are evaluated via simulation.
