Attitude Control System Design Of5-DOF Air Bearing Spacecraft Simulator Based On DSP

Along with the rapid development of the aerospace industry, space mission hasbecome more and more diverse, aerospace business will face greater challenge andmore technical problems. This requires the designed spacecrafts have more features,they must have more accurate structures and control systems which are complex andreliable. This will undoubtedly increase the expensive human and material resourcesinvestment. In order to reduce the risk to a minimum, every time before launch, a lot ofthe ground simulation and verify is needed. Air bearing spacecraft simulator can createweightless environment in space, can effectively validate the accuracy and reliability ofcontrol system, and its production cost is relatively low and can be used repeatedly.Visibly, the research work of the air bearing spacecraft simulator if of great significanceto the development of aerospace industry. This paper focuses on the attitude control ofthe5-DOF air bearing spacecraft simulator, design attitude control system based onDSP.Firstly, this thesis introduced the overall structure of the5-DOF air bearingspacecraft simulator, analyzed the functional requirements. We chose TI’s a newgeneration of dual-core DSP as the key MCU, completed the system hardware circuitdesign. On this basis, completed the interface and drive program design of each functionmodule.Secondly, in the base of existing description methods of rigid body and the theoryof dynamics, kinematics, the mathematical model of attitude motion of the simulatorwas derived. For different actuates, the attitude dynamic models of jet and flywheelcontrol system were separately derived.Finally, in combination of the attitude kinematics and dynamics equations, aimingat the jet and flywheel actuators, different simulation models were designed. On thebasis, the PD control law was designed and the simulation was done to validate controleffects. Considering uncertainty and external disturbance, a nonlinear integral slidingmode attitude controller was designed and the simulation was carried out.