Research On Actuator Fault Tolerant Control And Visual Simulation Platform Of Near Space Vehicles

The research object is nonlinear attitude model of near space vehicle (NSV) in reentry mode.Based on the model predictive control technology and adaptive observer technique, a fault-tolerantcontrol algorithm is proposed. Moreover, the control scheme can guarantee the stability of closed-loopsystem and is capable of tracking given command in the case of actuator fault. Finally simulationresults and the visual simulation platform verify the effectiveness of the proposed fault-tolerantcontrol scheme.Firstly, the research’s background, purpose and meaning are surveyed, then the history and thedevelopment of the fault and fault-tolerant control are described. An overview of the present state ofstudy and research about near space vehicle is elaborated, followed by the description of main contentof this article.Secondly, the nonlinear attitude model of near space vehicle is described, and then the NSV’sattitude model in reentry mode is simplified. Moreover, the open-loop characteristics are analyzed.The purpose is to provide a mathematical simulation model for the fault tolerant control algorithm inthe next chapter.Thirdly, a fault-tolerant control scheme is proposed for near space vehicles to deal with actuatorfault, considering the control input constraints. The control scheme combines the advantages of thelinear state feedback control with the nonlinear model predictive control to constitute a fault-tolerantcontrol law, and then uses the adaptive observer to obtain the fault estimation, and feedback the faultinformation to the system. Moreover, the control scheme can guarantee the stability of closed-loopsystem and is capable of tracking given command in the case of actuator fault. Finally, simulationresults verify the effectiveness of the proposed fault-tolerant control scheme.Finally, a scene simulation platform is studied for the NSV control system based on the previoustheoretical research. The two kinds of development software are Multigen Creator and Vega. Thesystem is through Matlab simulation data to drive the three-dimensional model of motion, and thenrealizes three-dimensional visual simulation research. According to the design demand of near spacevehicle visual simulation, the system is divided into four parts: model construction module, interfacemodule, data module and the virtual scene module. First, the near space vehicle model and instrumentmodel are established, then the NSV model is drove to move through the flight simulation data. Thefinal purpose is to observe the attitude motion of NSV model, the attitude information on the instrument display and environment changes in multi-view under the fault-tolerant control scheme toachieve the effect of3D scene simulation.