Research On Moding And Control Of Near-Space Airship's Flight Movements

Coming into 21th century, the Value of Near-Space has aroused people's attention greatly, and Near-Space Vehicles are very concerned by people, and then the stratospheric airship with many excellences becomes popular research subject in international. Among the key technologies applied in development of the stratospheric airship, the design of auto-control system is most important, and the development of the stratospheric airship will be a challenge mission because of its especial complexity. The works of study and design of the stratospheric airship are as follow:1. Based on analysing the forces acting on the stratospheric airship particularly, a nonlinear model is presented as the six-degree-of-freedom dynamic equation of motion according as the physical principles of the airship operation, and the open-loop simulation is given.2. Aiming at the stratospheric airship's characteristics of the nonlinear and the difficultly of acquiring model parameters, the nonlinear adaptive sliding mode control is adopted, its stability is proved. Then the control of the stratospheric airship is divided into lateral control, high control and velocity/position control, and the control laws are designed separately for them by the nonlinear adaptive sliding mode control method, and at last, the control laws are validated by Matlab simulation.3. Applying variable structure control with sliding mode method, the station-keeping control of the airship is researched at the level of the height of 21 km. The controller of station-keeping is given after analysing the effect of the stratospheric wind, and at last, the control laws are validated by Matlab simulation.4. Analysing the necessity and importance of the exploitation of Near-Space from military affairs, then introducing the applications of the Near-Space platform, and at last, summing up the platforms'effect in our country.