The Study On Design,Optimization And Experimental Application Of Compliant Revolute Joint

The compliant mechanism has the advantages of integral processing,high precision,freedom of assembly,frictionless wear and so on.Thus,it has been widely used in the fields of aerospace,medicine,MEMS and optical support control system.However,the problem that how to achieve large stroke and avoid drift and parasitic error while meeting the stiffness requirement has always been a design difficulty of the compliant mechanism.In this paper,the design of compliant revolute joint is taken as the research object.For the design difficulties,the initial structure of the compliant revolute joint is optimized by topology optimization method,the purpose is to make the joints obtain larger stroke and meet the stiffness requirement.Then,a compliant adjusting device is designed based on the compliant revolute joints for the problem of rotation control of plane mirror in the field of optical support control.Firstly,for the design of the compliant revolute joint,the initial model,rigid region and elastic structure region are set according to the requirements,and then the designed compliant revolute joint is optimized by the level set method of topology optimization,which makes the optimized joints obtain largest rotational displacement and smallest translational displacement to meet the design requirements.Then,the optimized joints are reconstructed,and the problems about edge jagged and sharp angle are analyzed and solved to avoid the stress concentration issue.Secondly,for the reconstructed compliant revolute joints,the finite element simulation analysis is carried out by ANSYS finite element simulation software,and the performance of the compliant revolute joints is analyzed from displacement,stress and angle displacement.Under the premise of ensuring the safety,the optimized compliant revolute joints can realize larger angle than the initial joint,which meets the requirements of large stroke,and the optimized joints owns more uniform stress distribution.Next,the 3D printing technology is used to make the models of reconstructed joints and the models will be used to carry out the step of turnover form.Then,the experiment platform is designed and built to verify the performance of the designed joints according to the applied driving load and constrained load.The designed compliant revolute joints can not only realize larger angle but also can control the small angle,and the stress test of the designed joints is carried out to keep safety.Finally,according to the application prospect of the compliant revolute joint,a compliant adjust device is designed based on the revolute control of plane mirror,and related research is carried out from demonstration of project,design and build of the experiment platform,design of the experimental procedure and collection of data.In this paper,the designed compliant revolute joints can realize large stroke and small revolute angle controlling,which owns high accuracy.During the procedure of experiment,the compliant adjust device owns better elastic recovery ability,which make the device owns higher revolute control accuracy.Therefore,the compliant revolute joint designed in this paper can achieve large stroke while satisfying the rigidity requirement,and which has strong elastic recovery ability and higher precision.They can be used not only in the engineering applications where require large angle,but also in other small rotation adjust devices.The design method in this paper is universal for designing compliant mechanism,and which has certain guiding significance for engineering application.