Internal Torques and Forces in Gyrostats with Magnetically Suspended Rotors

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dc.contributor.authorPressl, Marcus Carlen
dc.contributor.committeechairHall, Christopher D.en
dc.contributor.committeememberKasarda, Mary E. F.en
dc.contributor.committeememberWoolsey, Craig A.en
dc.contributor.departmentAerospace and Ocean Engineeringen
dc.date.accessioned2011-08-06T14:43:42Zen
dc.date.adate2003-12-22en
dc.date.available2011-08-06T14:43:42Zen
dc.date.issued2003-11-14en
dc.date.rdate2003-12-22en
dc.date.sdate2003-12-09en
dc.description.abstractActive magnetic bearings have several potential applications in spacecraft design. Based on the gyrostat model, we develop equations that describe the internal torques and forces that occur between the body and one of the attached wheels. We evaluate the transverse torques for the torque--free gyrostat and a gyrostat undergoing attitude maneuvers using momentum wheels and external torques. We then apply these internal forces to a model of an active magnetic bearing system and discuss their effects on the force limit, the actuator slew rate and the equivalent stiffness and damping parameters. As a basis for this study we use the Distributed Spacecraft Attitude Control System Simulator (DSACSS) with a Revolve MBRotor active magnetic bearing system. The results of several numerical simulations show that the magnitude and frequency of the internal torques remain small over the estimated range of motion of the DSACSS--MBRotor gyrostat. As such, the transverse torques caused by the rotational motion remain less than the discussed performance limits. We show that the magnitude of the internal torques can also be minimized by reducing the axial moment of inertia of the wheel. Furthermore, we discuss the equivalent Jeffcott model. By applying a standard Proportional--Integral--Derivative controller to the active magnetic bearing both the equivalent stiffness and damping parameters remain constant.en
dc.description.degreeMaster of Scienceen
dc.format.mediumETDen
dc.identifier.otheretd-12092003-165833en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-12092003-165833en
dc.identifier.urihttp://hdl.handle.net/10919/9646en
dc.publisherVirginia Techen
dc.relation.haspartthesismain.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectSpacecraft Simulatoren
dc.subjectGyrostaten
dc.subjectActive Magnetic Bearingsen
dc.subjectInternal Torquesen
dc.titleInternal Torques and Forces in Gyrostats with Magnetically Suspended Rotorsen
dc.typeThesisen
thesis.degree.disciplineAerospace and Ocean Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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