Design Of Locking And Switching Mechanism Of Magnetic Suspension Shafting

The real-time nature of remote sensing images directly affects the efficiency of remote sensing detection,and has become an urgent problem in the field of remote sensing detection in various countries.Enlarging the scanning area by making the camera swing is an effective solution to improve the detection efficiency.One of the main research directions in this field is to adopt a new type of magnetic suspension shafting to carry the camera turntable to ensure the stability and accuracy of the camera swing.Due to the complexity of the space environment,the new magnetic suspension shafting may fail to ensure the long-term stability of remote sensing satellites.To solve this problem,a locking and switching mechanism of magnetic suspension shafting is proposed.The mechanism can replace the auxiliary bearing by eliminating the clearance of the auxiliary bearing to lock the magnetic suspension shafting when the magnetic bearing fails,and realize the locking function in launching stage.In this paper,the locking and switching mechanism is designed and analyzed from the functional aspect,and the locking and switching scheme based on flexible structure is determined.Combing the working flow and strategy of locking and switching mechanism,systematically designing the key executing parts such as driving device,flexible hinge and so on involved in the scheme,and solving the problem of locking and switching.The kinematics model of the key actuator flexible hinge is established by using the design and analysis method of flexible mechanism.The relationship between its parameters and boundary conditions is matched.The influence of rigid boundary index and several evaluation parameters on the parameters of the flexible hinge model is studied,and the structural parameters are determined.The mathematical model of flexible hinge is established by chain algorithm,and the motion law of solid three-dimensional structure is studied.Based on the specific parameters of the key components,the parameter design of other supporting mechanisms is improved.The tolerance of each component is determined through the analysis of dimension chain and error transfer process.The statically indeterminate problem of flexible hinges supported by multiple flexible hinges is studied.The limit load of each supporting rod is analyzed.The number of circumferentially uniformly distributed supporting rods is designed to be 6.The material 60Si2 CrA was selected by finite element analysis,and the stress changes of flexible hinge during deformation and support were calculated and checked.The quasi-static and dynamic analysis of the whole configuration of the locking and switching mechanism is carried out by ABAQUS software.The additional bending stress caused by the asynchronous contact between the two sides of the supporting rod is solved in the analysis of the locking process.After optimization,the maximum bending stress is lower than the yield strength of the material.By equivalent analysis of the mechanical and kinematic characteristics of the switching process by similarity theorem,the time required for the switching process is determined.The key performance indicators of the locking and switching mechanism are given based on the overall work.The designed mechanism can better achieve the locking and switching functions required by the task.