Input coupling modeling method for a three-PRR flexure-based compliant stage

This paper presents the input coupling modeling method for a three-PRR flexure-based compliant stage. The input coupling modeling for planar compliant mechanisms is first established. The kinematic structure of a three-PRR compliant stage is then designed, and its input coupling is derived by using the proposed method. Subsequently, the validation and analysis are carried out by using finite element method (FEM). The relationships between two main parameters and the input coupling rate of the three-PRR compliant stage are discussed, and the decoupling region is then determined. Finally, its geometrical parameters are optimized, and the workspace calculated by the analytical method is compared with that obtained from FEM. It not only provides a new input coupling modeling method for flexure-based compliant mechanisms, but also provides a reference for the design of three-PRR mechanisms.