Research on mechanism of actuated active reflectors for FAST
Lu Zhen1, Yang Guang2, Wang Qiming3, Nan Rendong3*
1. School of Automation Science and Electrical Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China;
2. School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100083, China;
3. National Astronomical Observatory, Beijing, 100012, China
A new type of actuate mechanism for the active reflector of FAST(five-hundred-meter aperture spherical telescope) radio telescope was proposed so that one can overcome the deficiency of original actuate mechanism. The mechanism was utilized to prevent from the sideslip in the margin cell of the active reflector, and to promote the mechanical efficiency and reliability, and to reduce the cost of manufacture and operate. The core of the improvement is so-called Sarrus linkage that can produce perfect translational motion without any sideslip. The kinematical analysis was made to demonstrate the feasible of the prototype, and the force analysis indicates that the system has sufficient strength and stiffness. The prototype operation and simulation prove that one can prevent any sideslip of the reflector’s units based on the new type actuate mechanism, even in the base slope of 45°. The issuers of being improved point out, which are essential for the design and manufacture of the real system.