A linear piezoelectric actuator based on the stick-slip principle is presented and tested\nin this paper. With the help of changeable vertical preload force flexure hinge, the designed linear\nactuator can achieve both large travel stick-slip motion and high-resolution stepping displacement.\nThe developed actuator mainly consists of a bridge-type flexure hinge mechanism, a compound\nparallelogram flexure hinge mechanism, and two piezoelectric stacks. The mechanical structure\nand motion principle of the linear actuator were illustrated, and the finite element method\n(FEM) is adopted. An optimal parametric study of the flexure hinge is performed by a finite\nelement analysis-based response surface methodology. In order to investigate the actuatorâ��s\nworking performance, a prototype was manufactured and a series of experiments were carried out.\nThe results indicate that the maximum motion speed is about 3.27 mm/s and the minimum stepping\ndisplacement is 0.29 �¼m. Finally, a vibration test was carried out to obtain the first natural frequency\nof the actuator, and an in situ observation was conducted to investigate actuatorâ��s stick-slip working\ncondition. The experimental results confirm the feasibility of the proposed actuator, and the motion\nspeed and displacement are both improved compared with the traditional stick-slip motion actuator.
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