Modular Modification of a Buoyant AUV for Low-Speed Operation

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dc.contributor.authorNickell, Christopher Leeen
dc.contributor.committeechairWoolsey, Craig A.en
dc.contributor.committeememberSchaub, Hanspeteren
dc.contributor.committeememberStilwell, Daniel J.en
dc.contributor.departmentAerospace and Ocean Engineeringen
dc.date.accessioned2014-03-14T20:45:19Zen
dc.date.adate2005-09-23en
dc.date.available2014-03-14T20:45:19Zen
dc.date.issued2005-09-09en
dc.date.rdate2005-09-23en
dc.date.sdate2005-09-12en
dc.description.abstractConventional streamlined autonomous underwater vehicles (AUVs) with a single thruster and stern planes are typically trimmed to be somewhat buoyant or heavy in water. To maintain depth, they must generate a constant hydrodynamic force which requires that they swim at a constant pitch angle. Although tail fins are the typical mechanism for generating this control moment, they become ineffective at low speeds. To enable an existing AUV to travel at lower speeds, one may easily incorporate a modular moving mass actuator. In some cases, it may also be advantageous to include a fixed wing. The equations of motion and equilibrium conditions to regulate depth are derived, and the effectiveness and low-speed efficiency of a fixed wing is evaluated. The effect of the vertical offset of the moving mass is analyzed to establish the relation between the control angle and the moving mass linear position. A description of the design of a one degree of freedom moving mass actuator module and preliminary experiments using the Virginia Tech Miniature AUV is provided. Data is presented for a series of fixed MMA position experiments as well as a dynamic position test. The results illustrate the effectiveness of a moving mass actuator at generating low-speed control moments. With the collected data, parameter identification is performed to get an estimate of the hydrodynamic parameters.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-09122005-121951en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-09122005-121951/en
dc.identifier.urihttp://hdl.handle.net/10919/35029en
dc.publisherVirginia Techen
dc.relation.haspartThesis.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectAutonomous Underwater Vehicleen
dc.subjectAUVen
dc.subjectMoving Massen
dc.subjectInternal Actuationen
dc.titleModular Modification of a Buoyant AUV for Low-Speed Operationen
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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