Papers by Keyword: Parallel Four-Bar Mechanism

Abstract: The displacement amplification and hysteresis of parallel four-bar mechanism using piezo actuator were researched in this paper. The displacement amplification was analyzed by employing the material bending theory firstly. Theoretical and FEM analysis proved that the amplification ratio of parallel four-bar mechanism is only related to the position of driving point and the guiding arm displacement is directly proportional to the input with the certain structure. Then the Preisach model was employed to model the hysteresis of guiding arm and using the model to perform the research on the output displacement of the mechanism. Experiments proved that the analysis is correct and showed that this model can effectively improve the accurate of the guiding arm output displacement and can realize output arbitrary series displacement using the Preisach interpolation surface.

Abstract: This paper researched the displacement amplification and hysteresis of parallel four-bar amplification mechanism using piezo actuator. Firstly, the displacement amplification was analyzed by employing the material bending theory. Theory and finite element model (FEM) proved that the amplification ratio of parallel four-bar mechanism is only related to the position of driving point and the guiding beam displacement is linear with the driving point input when it is fixed. Then the Preisach model was employed to model the hysteresis of guiding beam and performed to control the output displacement of the mechanism. Experiments proved that the model can effectively improve the output displacement accurate of the guiding beam and can realize random sequence output displacement using the Preisach interpolation surface.

Abstract: For its fast response, nanometer resolution, no backlash, no friction and bigger driving force, flexure hinge has been commonly used as a substitute for mechanical joints in the design of micro-displacement mechanisms used in vibration suppression and micro-positioning applications. However, inaccurate modeling of flexure hinges deteriorates the positioning accuracy. In this paper, a planar two-degree-of-freedom (DOF) parallel four-bar manipulator is designed with the intention of accurate flexure hinge modeling. A 1-DOF flexure hinge is considered, a static analysis and a dynamic analytical model of parallel four-bar manipulator is presented. Simulation result based on the finite element method is coincident to the analytic result. Based on the theoretical analysis, the experimental demonstration to study the performance of the manipulator is described, and experimental results are in close agreement with those predicted by the theoretical analysis.