Research On Design And Structure Of Orbital Orientation Adjustment Mechanism Of Space Magnetic Imager

The space magnetic imager is a kind of solar telescope.It is mainly responsible for observing the relationship between the solar magnetic field,the solar flare and the corona material,and the influence of solar activity on various physical parameters of the earth.In this paper,the orbital pointing adjustment mechanism of a certain type of space magnetic imager is analyzed and designed.The total mass of the optical box is 95 Kg,so that the optical axis of the space camera can achieve up and down pitch and left and right yaw more than The deflection angle of ±720arcsec,and the error during the adjustment process does not exceed±5arcsec,so the design accuracy of the pointing adjustment mechanism is very high.According to the motion requirements of the space camera adjustment mechanism,the motion characteristics of the two adjustment mechanisms are studied,which are the adjustment mechanism based on the flexible hinge and the adjustment mechanism based on the crank rocker mechanism.Firstly,the movement principle and structural components of the flexible hinge-based adjustment mechanism are introduced.The application and main classification of the flexible hinge are introduced in detail.The modeling and simulation of Adams software is used to calculate the flexible hinge used in the mechanism.The displacement of the geometric center is determined,and the flexible hinge used in the model is determined as a multi-axis flexible hinge.The kinematics simulation of the motion model is performed by Adams software and Matlab software,and the simulation results of the two softwares are compared.The simulation results are found.Both the adjustment range and the adjustment accuracy meet the design requirements.Then,the motion principle and structural components of the motion mechanism of the adjustment mechanism based on the crank rocker mechanism are introduced.The synchronization mechanism designed in the adjustment mechanism is introduced in detail,and the motion model is established by Adams and the kinematics simulation is carried out.Finally,it is concluded that the kinematics of both motion mechanisms meet the design requirements of adjustment range and adjustment accuracy.After the design of the motion model is completed,the design of the crank rocker mechanism used in the adjustment mechanism based on the crank rocker mechanism is further studied.Firstly,the motion parameters of the crank rocker mechanism are derived from the mathematical model.Including the angular displacement,angular velocity and angular acceleration of the connecting rod and the rocker,and then using the Matlab software to design the length of the crank rocker mechanism,the optimal structural length is obtained,that is,the connecting rod length is 182 mm,and the rocking rod is long.It is 808 mm.The motion analysis and simulation of the designed crank rocker mechanism are carried out by Matlab software.The results show that the designed crank rocker mechanism meets the design requirements.Finally,the static simulation and lightweight design of the screw linkage based on the flexible hinge adjustment mechanism are used to reduce the component quality on the basis of ensuring the structural strength.Then,the modal simulations of the two adjustment mechanisms were carried out,and the stiffness of the two mechanisms was optimized from three aspects: increasing the auxiliary support,enhancing the structural rigidity of the components of the adjustment mechanism,and enhancing the structural rigidity of the optical box.The first-order natural frequencies are all greater than 100 Hz,which ensures the safety of the equipment structure.