A Comparison Study on Control Moment Gyroscope Arrays and Steering Laws

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dc.contributor.advisorLee, Regina S. K.
dc.contributor.authorMoorthy, Chitiiran Krishna
dc.date.accessioned2020-05-11T12:56:02Z
dc.date.available2020-05-11T12:56:02Z
dc.date.copyright2019-12
dc.date.issued2020-05-11
dc.date.updated2020-05-11T12:56:02Z
dc.degree.disciplineEarth & Space Science
dc.degree.levelMaster's
dc.degree.nameMSc - Master of Science
dc.description.abstractCurrent reaction wheels and magnetorquers for microsatellite are limited by low slew rate and heavily depends on orbital parameters for coverage area. Control moment gyroscope (CMG) clusters offer an alternative solution for high slew rates and rapid retargeting. Though CMGs are often used in large space missions, their use in microsatellites is limited due to the stringent mass budget. Most literature reports only on pyramid configuration, and there are no definite cross-comparison studies between various CMG clusters and steering laws. In this research, a generic tool in Matlab and Simulink is developed to further understand CMG configurations and steering laws for a microsat mission. Various steering laws necessary for mitigating singularities in CMG clusters are compared in two distinct missions. The simulation results were evaluated based on the pointing accuracy, platform jitter, and pointing stability achieved by the spacecraft for each combination of CMG clusters, and steering laws and trajectories. The simulation results demonstrate that the pyramid cluster is marginally better than the rooftop cluster in pointing accuracy. The comparison of steering laws shows that, counterintuitively, Singularity Robust steering law, which passes through singularities, outperforms both Moore-Penrose and Local Gradient methods for almost all evaluation criteria for the two missions it was tested on. The simulation results would aid systems engineers in designing low-cost actuation systems and corresponding control software, which can increase the data acquisition rate of remote sensing missions.
dc.identifier.urihttps://hdl.handle.net/10315/37483
dc.languageen
dc.rightsAuthor owns copyright, except where explicitly noted. Please contact the author directly with licensing requests.
dc.subjectMechanical engineering
dc.subject.keywordsControl Moment Gyroscope
dc.subject.keywordsSteering Law
dc.subject.keywordsCMGA
dc.subject.keywordsControl Moment Gyroscope Array
dc.subject.keywordsControl Moment Gyroscope Cluster
dc.subject.keywordsSatellite actuators
dc.subject.keywordsActuators
dc.subject.keywordsMomentum exchange device
dc.subject.keywordsSpacecraft Momentum Control Systems
dc.subject.keywordsGyrodyne
dc.subject.keywordsChitiiran
dc.titleA Comparison Study on Control Moment Gyroscope Arrays and Steering Laws
dc.typeElectronic Thesis or Dissertation

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