Attitude regulating mechanism design and analysis of space large aperture deployable membrane optical primary mirror

With the rapidly increasing demand of space exploration missions, the space optical imaging system with large aperture, high resolution and excellent stability will play an important role in exploration and observation. The camera aperture is larger, system controllability, ground launch, space folding and pose regulating are more difficult based on current technology. Conditional imaging system has a disadvantage of heavy mass and is hardly to realize large aperture. In order to solve the numerous technical problems of traditional reflective imaging system, high-resolution and lightweight membrane based diffraction optical imaging system is proved to be a new technological approach. An optical primary mirror and a supporting deployable mast of Membrane based diffraction optical imaging system can be folded at launch, which is unrestricted by the payload volume of a rocket and can adapt to different satellite bus. Based on the theory and architecture of diffraction optical imaging, this paper proposed an effective method of system design and analysis of space deployable membrane optical imaging mechanism aimed at large aperture, high resolution and greater aperture to height ratio. A new deployable imaging mechanism including articulated triangular truss mast and membrane optical primary mirror supported by the triangular masts was proposed. The applicability of Stewart parallel mechanism in attitude adjusting mechanism of the primary optical primary mirror was analyzed thoroughly according to constraint conditions including large aperture, short distance and small range of motion. A parameter evaluation method based on controllability and regulation was proposed, and the structural parameters of Stewart parallel mechanism were analyzed. The attitude adjustment mechanism was designed based on the Stewart parallel mechanism, and the motion characteristics were verified by ADAMS and MATLAB.