Research On Mechanical Characteristics Of Flexure Pivot And Application In Vibration Isolation Systems

Flexure pivots can eliminate side gaps,friction and wear,have the advantages of simple structure and small mass,and are gradually used in various engineering fields because of the high repeatability of motion without slips and gaps.At present,the research on flexure pivots have used more linear models with small deformations,and for large deformation cases,there have been fewer analyses due to the design difficulties and complex methods.Therefore,it is necessary to research nonlinear large-deformation flexure pivots,analyze the mechanical characteristics of flexure pivots under different parameters,and then investigate the application of flexure pivots in vibration isolation systems.The main contents are as follows:Starting from the theoretical analysis,the mechanical modeling of the flexure pivots that generate large deformation after being loaded was carried out,and the mechanical model was solved by numerical methods.The deformation of the flexure pivot was analyzed based on the Euler Bernoulli beam model,and the deformation model of the cross-spring flexure pivot was analyzed based on the flexible beam.For the mechanical model of the flexible beam,the shooting method and the finite difference method were mainly used to solve the mechanical model,and the L-M numerical iterative method was used to solve the mechanical model of the cross-spring flexure pivot.Based on the solution of the mechanical model,the mechanical characteristics of the flexure pivot such as displacement deformation,center-shift,stiffness and stress distribution were researched,and the effects of geometry,shape,material parameters and symmetry of the structure on the mechanical properties were analyzed.The results of the theoretical analysis of the flexure pivot were verified by using finite element method and experimental measurement method.Five working conditions were selected,the finite element model was established,the experimental platform for testing the mechanical properties of the flexure pivot was designed and built,and the finite element analysis and experimental results were compared with the numerical results.The characteristics of wind spring/damper device vibration isolation systems with and without flexure pivots were investigated and the performance differences were simulated and compared with and without flexure pivot vibration isolation systems by ADAMS.The analysis results show that the proposed method has certain accuracy in calculating the large deformation of flexure pivots,the mechanical characteristics of flexure pivots show nonlinear changes,and different parameters have different degrees of influence on the mechanical characteristics.Flexure pivots can play their own advantages in wind spring/damper vibration isolation systems,which is an important reference for the application of flexure pivots in vibration isolation systems.