关键词: 连杆机构, 多因素耦合, 运动精度, 可靠性及灵敏度

Abstract:

Planar linkage mechanisms are widely applied to many machines. But such a long transmission distance will cause a  large error accumulation,and the impact on the kinematic accuracy can not be ignored. A modeling method of kinematic accuracy reliability analyses and simulation  process was proposed considering multi-factor coupling effects of manufacturing errors, structure deformation, assembly tolerance and hinge wear. The dynamics analyses of the mechanism were carried out after the clearance joints were dealt with momentum exchange approach. Based on the results of dynamics analyses, the Hook's law or finite element method was used to analyze the deformation of the  components and Archard's model was used to analyze the wear depth of each joints. Follow that, the closed vector position equation of the mechanism was established after the clearance joint was replaced with massless link considering manufacturing errors, structural deformations, and a kinematical accuracy modeling method was also proposed considering the multi-factor coupling effects. The feasibility of the proposed method was proved by the kinematic accuracy reliability and sensitivity analysis of an aircraft door retractable mechanism and finally gives some valuable advices for manufacture and maintenance process.

Key words: linkage mechanism, multi-factor coupling, kinematic accuracy, reliability and sensitivity