Control system for 6 degree of freedom electric platform of sub-mirror in the giant telescope

摘要

Giant telescopes with extremely large aperture widely adopt segmented mirror active optics technology, so activeadjustment mechanism of displacement is one of the critical techniques. A novel 6-DOF mechanism featuring structuralcompactness in size and partial decoupling in degrees has been proposed as a potential supporting mechanism forsub-mirrors. It is of important significance to carry out profound study on the control strategy for large scale use of the6-DOF adjustment mechanism in a highly segmented giant telescope. This paper presents first the control system designfor a prototype of the 6-DOF mechanism and further the control strategy modeling for the future large-scale applicationof the mechanism in giant telescopes. The control system implemented for the prototype mechanism has beensuccessfully tested by photogrammetry at lab. It provides closed-loop control and real-time measurement of all motors ofone 6-DOF mechanism and is proved to be a system of high precision and efficiency. Afterwards, we explore and extendthe control design of the novel 6-DOF mechanism to large-scale use in all sub-mirrors in a giant telescope. The principle,constitution, control algorithm and realization are covered and commented. The study and experiment carried out in thispaper are also informative for the control of parallel manipulators in other industries.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.