Research on-orbit temperature variation stability of the positioning accuracy of maintenance interface

Abstract The space telescope is running, which is influenced by the rapid temperature difference. The paper analyzes the stability of the space environment of the on-orbit maintenance interface. The influence of temperature changes on the positioning of the interface mechanism is studied. Based on the 3-2-1 kinematic positioning principle, a mathematical model is established, and the mathematical expression of the on-orbit positioning accuracy of the back-end module between the temperature change and the interface layout point is deduced, and the variation quantity and the displacement variation of the angle of the center point are derived. The results show that when the line of AB points coincides with the positioning axis of B point, the rotation angle of the back-end module in the plane composed of A, B, C three points is the smallest. Through the relationship between the four independent variables λ, μ, η, t and the change of the central point ∆ E , it is concluded that when A, B, C three-point layout is obtained, to make the back-end module have the highest stability, the order of variable design should be η, t, λ and μ. The suspension wire system was used to build a ground microgravity simulation test rig. The gravity unloading and thermal stress tests were carried out by the balancing mass method. The thermal stress test results prove that the interface can realize kinematics positioning and complete the on-orbit thermal stress release.