Thrust vector control of satellites using smart parallel manipulators

摘要

This paper presents the concept, control strategy, and simulations of thrust vector control of satellites. First, an innovative thrust vector control concept is introduced, which utilizes the UHM multifunctional smart parallel manipulator to provide precision position control of the thruster vector and vibration suppression capability while the thruster fires. The configuration of the thrust vector control system is then illustrated, and the satellite attitude dynamic model is built. Third, the UHM smart parallel manipulator is introduced and its kinematics and controller design are discussed. The fuzzy logic controller is employed to precisely position the smart parallel manipulator and to compensate the non-linearities due to the friction and backlash of the actuators and the tolerance of the joints. Finally, the satellite attitude controller and the fuzzy logic controller are designed, and simulations are carried out to realize the thrust vector control of a satellite. The results indicate that the smart parallel manipulator can precisely achieve the thrust vector control, the misalignment of the trust vector of the satellite can be corrected effectively, and the position accuracy of the thrust vector is 0.68 arc minutes.