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Full Scale Investigation of Bilge Keel Effectiveness at Forward Speed

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dc.contributor.authorGrant, David J.en
dc.contributor.committeechairMcCue-Weil, Leigh S.en
dc.contributor.committeememberEtebari, Alien
dc.contributor.committeememberHughes, Owen F.en
dc.contributor.departmentAerospace and Ocean Engineeringen
dc.date.accessioned2014-03-14T20:35:31Zen
dc.date.adate2008-06-03en
dc.date.available2014-03-14T20:35:31Zen
dc.date.issued2008-04-28en
dc.date.rdate2008-06-03en
dc.date.sdate2008-05-07en
dc.description.abstractShip motions in a seaway have long been of great importance, and today with advanced hull forms and higher speeds they are as important as ever. While one can now often adequately predict heave, pitch, sway, yaw and even surge, roll motions are much more difficult. Roll is the one motion that is very dependent upon viscous effects of the fluid. Recently, at David Taylor Model Basin, there have been model experiments where the bilge keels were instrumented in order to directly measure their damping force upon the vessel. To build upon this work and to validate it when applied to full scale vessels, a trial using the Italian naval vessel Nave Bettica was performed. The objective of this thesis is to describe the experiment, present and analyze the results, and offer some conclusions based upon these results. The process of instrumenting the port bilge keel using strain gages and correlating their output to pressures and total forces is described. Selected results for different forward speeds are presented, with full results in the appendices. Particle image velocimetry (PIV) was also performed during the test and was used to measure the flow field in a three foot by three foot area under the aft end of the same bilge keel. Selected image series are presented, as is a methodology for using these images to calculate the center of pressure and the corresponding results.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-05072008-133744en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05072008-133744/en
dc.identifier.urihttp://hdl.handle.net/10919/32322en
dc.publisherVirginia Techen
dc.relation.haspartdgrant-final-ETD.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectbilge keelen
dc.subjectroll dampingen
dc.subjectfull scaleen
dc.titleFull Scale Investigation of Bilge Keel Effectiveness at Forward Speeden
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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