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Maneuvering of slender X-fin AUVs with hydrodynamic derivatives informed through CFD

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dc.contributor.authorPerron, Alexander J.en
dc.contributor.committeechairBrizzolara, Stefanoen
dc.contributor.committeememberStilwell, Daniel J.en
dc.contributor.committeememberPaterson, Eric G.en
dc.contributor.departmentAerospace and Ocean Engineeringen
dc.date.accessioned2023-08-16T08:00:10Zen
dc.date.available2023-08-16T08:00:10Zen
dc.date.issued2023-08-15en
dc.description.abstractThe work in this thesis is concerned with the generation of Lumped Parameter Models (LPM) for two, slender, torpedo shaped, X-fin craft. This process involves the use of CFD to simulate captive maneuvers that are normally performed using test equipment in the field. These captive maneuvers are refereed to as planar motion mechanisms (PMM), and when simulated through CFD are refereed to as virtual planar motion mechanisms (VPMM). The results from VPMM are used to determine the hydrodynamic derivatives that inform the LPM. There was some inconsistency in the VPMM data based on the frequency and amplitude that the VPMM was run. A brief study was run to look at this effect. Afterwards, Open and closed loop, autopilot assisted, maneuvers are implemented and performed using the LPM model through Simulink. Results of these maneuvers are analyzed for craft stability. Additionally, comparisons of LPM maneuvers to field data are performed. Critiques of the craft stability and effect of the autopilot are made.en
dc.description.abstractgeneralThe work carried out in this thesis involves the creation of a physics based model of an underwater craft. This physics based model is informed through characteristics determined by running computational fluid dynamics (CFD) simulations. The benefit of such a model, is the simplification from CFD to a 6 degree of freedom (6-DOF) lumped parameter model (LPM). These physics models, LPM, are generated for two particular craft of interest. One craft is an existing design used by NUWC (named Tonnetto), while the other design is one generated to be similar in shape and size to the NUWC craft (named Hokie). Computer simulated maneuvers are carried out using these models to asses craft stability and performance. An autopilot is implemented into the models for some of these simulations to see its affects on the crafts performance. Additionally, these simulated maneuvers are compared to field data collected by NUWC.en
dc.description.degreeMaster of Scienceen
dc.format.mediumETDen
dc.identifier.othervt_gsexam:38258en
dc.identifier.urihttp://hdl.handle.net/10919/116046en
dc.language.isoenen
dc.publisherVirginia Techen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectManeuveringen
dc.subjectAUVen
dc.subjectX-finen
dc.subjectCFDen
dc.subjectVPMMen
dc.subjectPlanar motion mechanismen
dc.subjectLumped parameter modelen
dc.subjectAutopiloten
dc.subjectHydrodynamic derivativesen
dc.titleManeuvering of slender X-fin AUVs with hydrodynamic derivatives informed through CFDen
dc.typeThesisen
thesis.degree.disciplineAerospace Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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