Session
Session V: 14th Annual Frank J. Redd Student Scholarship Competition
Abstract
Keywordsattitude control, robust control, fuzzy logic The performance and power characteristics of any satellite attitude control system are crucial to the success of the satellite mission. This is especially true for small satellites, which have some of the strictest constraints of all. Reaction wheel systems are an attractive means of control for many satellites, because they offer a high pointing accuracy and are not fuel dependent. These systems are typically more complex, however, and can be fairly demanding on the satellite power system. This paper focuses on two major difficulties associated with the implementation of reaction wheel systems. First, the problem of model uncertainty and system robustness is addressed. In this portion of the paper, the equations of attitude dynamics are linearized with respect to the target attitude and robust control theory is used to ensure robust stability against parametric uncertainty in the reaction wheel angular momentum and satellite inertia matrix. Second, the problem of momentum unloading via induced magnetism is addressed. In this portion of the paper, a fuzzy gain-scheduler is developed to better utilize available resources and minimize power consumption during critical satellite functions.
Presentation Slides
Robust Attitude Control with Fuzzy Momentum Unloading for Satellites using Reaction Wheels
Keywordsattitude control, robust control, fuzzy logic The performance and power characteristics of any satellite attitude control system are crucial to the success of the satellite mission. This is especially true for small satellites, which have some of the strictest constraints of all. Reaction wheel systems are an attractive means of control for many satellites, because they offer a high pointing accuracy and are not fuel dependent. These systems are typically more complex, however, and can be fairly demanding on the satellite power system. This paper focuses on two major difficulties associated with the implementation of reaction wheel systems. First, the problem of model uncertainty and system robustness is addressed. In this portion of the paper, the equations of attitude dynamics are linearized with respect to the target attitude and robust control theory is used to ensure robust stability against parametric uncertainty in the reaction wheel angular momentum and satellite inertia matrix. Second, the problem of momentum unloading via induced magnetism is addressed. In this portion of the paper, a fuzzy gain-scheduler is developed to better utilize available resources and minimize power consumption during critical satellite functions.
