Analytical study of a jointless mechanism for magnifying the displacement of a piezoelectric actuator

Subject Areas : Vibration Transmision

Ammirreza Asgari ¹ , Abdorrahim Asgari ²

1 - Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
2 - Department of Physics, Tarbiat Moallem University of Sabzevar, Sabzevar, Iran

Received: 2011-08-23 Accepted : 2011-08-23 Published : 2011-08-23

Keywords: Mechanical amplifier, mechanisms with Flexure hinges, quasi rigid body method for analyzing mechanisms with Flexure hinges,

Abstract :

Mechanisms with flexible joints transfer displacement, force and energy by using flexure hinges instead of Simple hinge joints. Reduction of manufacturing costs, increasing the accuracy of these mechanisms, absence of error caused by being loose and lack of joint wear and vibration problems resulting from their movements are among the advantages of these types of mechanisms. In this article for analyzing these mechanisms, a quasi-rigid model was used. Then, by introducing and evaluating a number of mechanical magnification mechanisms which were used to increase the movement of piezoelectric actuator, a new model is also provided and analyzed. This new model offers a high ratio in compact dimensions that is pretty good compared to previous models. The natural frequency of the model and the lack of lateral movements are among advantages of this model compared to the models introduced. We will review and determine the design parameters for the analytical solution for the optimal work condition of the quasi-rigid mode. Also, by using finite element analysis and comparison of its results with analytical solutions, the effect of various parameters on the performance of this mechanism have been identified and at the end an optimal mechanism is offered.