Fault Tolerant Attitude Control of a Pico-Satellite Equipped with Reaction Wheels and Magnetorquers: Fault Tolerant Attitude Control of a Pico-Satellite Equipped with Reaction Wheels and Magnetorquers
Translated title
Fault Tolerant Attitude Control of a Pico-Satellite Equipped with Reaction Wheels and Magnetorquers
Authors
Nicolae, Alexandru-Cosmin ; Bolgar, Daniel ; Biniakos, Nicolaos
Term
4. term
Education
Publication year
2018
Submitted on
2018-06-07
Abstract
This master’s thesis examines how to detect actuator faults and maintain attitude control in a pico-satellite equipped with reaction wheels and magnetorquers. The work defines requirements and a use case, models the satellite’s dynamics and relevant environmental disturbances, and develops a control architecture comprising attitude reference generation, a main attitude controller, and a desaturation strategy to manage accumulated wheel momentum. Detailed models of reaction wheels and magnetorquers are built, and a Failure Mode and Effects Analysis (FMEA) is used to identify critical faults and guide the design of fault detection and fault-tolerant reconfiguration. The approach includes, among others, virtual actuators/sensors and reallocation of control effort when components degrade or fail. The complete solution is implemented and assessed in a MATLAB/Simulink-based simulation environment (AAUSAT library), including an acceptance test against the stated requirements. Evaluation is conducted solely in simulation; no hardware experiments are included in this work.
Denne kandidatafhandling undersøger, hvordan aktuatorfejl kan detekteres og håndteres for at opretholde attitudekontrol på en picosatellit udstyret med reaktionshjul og magnettorquere. Arbejdet opstiller krav og et anvendelsesscenarie, modellerer satellittens dynamik samt relevante miljøforstyrrelser og udvikler en kontrolarkitektur bestående af attitudereference, hovedattitudekontroller og en desatureringsstrategi til håndtering af opsamlet hjulmoment. Der opbygges detaljerede modeller af reaktionshjul og magnettorquere, og en fejlmåde- og effektanalyse (FMEA) anvendes til at identificere kritiske fejl og styre designet af fejldetektion og fejltolerant rekonfiguration. Tilgangen omfatter blandt andet virtuelle aktuatorer/sensorer og omfordeling af styreindsats, når komponenter degraderer eller fejler. Hele løsningen implementeres og vurderes i et MATLAB/Simulink-baseret simulationsmiljø (AAUSAT-bibliotek) med en afsluttende accepttest mod de formulerede krav. Evalueringen er udelukkende gennemført i simulation; der indgår ingen hardwareforsøg i dette arbejde.
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