Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Modeling and frequency domain identification of a satellite mockup
Submission Author:
André Fialho Coelho , RJ
Co-Authors:
Luiz Benicio Degli Esposte Rosa, Renan Santos, André Fialho Coelho
Presenter: Luiz Benicio Degli Esposte Rosa
doi://10.26678/ABCM.COBEM2017.COB17-2013
Abstract
Attitude control is critical to a spacecraft mission success and considering the uniqueness of the structures, a high-fidelity dynamic model is key to find the optimal, applicable design. The present work aims to obtain a model for a satellite mockup for attitude-control design purposes, with frequency response at low frequencies (less than 10 rad/s) comparable to that of the physical system. The setup consists of a single reaction wheel (RW) working as the actuator of the control system, and attitude determination is provided by a gyroscope. All components are installed on a spin table to mimic spacecraft behavior. The whole process comprehended the following steps: establishing a mathematical model for the mockup by generalization of Newton’s laws to rigid bodies, and performing system identification through frequency-domain curve fitting, in order to adjust the parameters and improve the model. The final result was assessed as satisfactory and an adequate starting point for control design.
Keywords
Satellite modeling, System Identification, Spin table, Reaction wheel
