Flexible hinges are widely used as one of the essential components to micro motion robot.The positioning and of micro motion robot ending positioning is effected directly by its stiffness.However

due to the diversities and complexities of practical demands

the geometric dimension of its practical structure is not satisfied the assumed condition of traditional theroy analysis and the accuracy analysis of its performance is effected.Based on finite element methods

the rotation stiffness of many different geometrical parameters for straight beam flexible hinge is analyzed.Comparing with the analytical results and the root cause of the errors are analyzed.