Show simple item record

dc.contributor.authorLinklater, Amy Catherineen_US
dc.date.accessioned2014-03-14T20:40:10Z
dc.date.available2014-03-14T20:40:10Z
dc.date.issued2005-06-03en_US
dc.identifier.otheretd-06172005-114444en_US
dc.identifier.urihttp://hdl.handle.net/10919/33622
dc.description.abstractOceanographers are currently investigating small-scale ocean turbulence to understand how to better model the ocean. To measure ocean turbulence, one must measure fluid velocity with great precision. The three components of velocity can be used to compute the turbulent kinetic energy dissipation rate. Fluid velocity can be measured using a five-beam acoustic Doppler current profiler (VADCP). The VADCP needs to maintain a tilt-free attitude so the turbulent kinetic energy dissipation rate can be accurately computed to observe small-scale ocean turbulence in a vertical column. To provide attitude stability, the sensor may be towed behind a research vessel, with a depressor fixed somewhere along the length of the towing cable. This type of setup is known as a two-part towing arrangement. This thesis examines the dynamics, stability and control of the two-part tow. A Simulink simulation that models the towfish dynamics was implemented. Through this Simulink simulation a parametric study was conducted to see the effects of sea state, towing speed, center of gravity position, and a PID controller on the towfish dynamics. A detailed static analysis of the towing cableâ s effects on the towfish enhanced this dynamic model. The thesis also describes vehicle design and fabrication, including procedures for trimming and ballasting the towfish.en_US
dc.publisherVirginia Techen_US
dc.relation.haspartAmyThesis.pdfen_US
dc.rightsI hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Virginia Tech or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.en_US
dc.subjectTowfishen_US
dc.subjectDynamic Modelingen_US
dc.subjectUnderwater Vehicleen_US
dc.subjectTowed Vehicleen_US
dc.titleDesign and Simulation of a Towed Underwater Vehicleen_US
dc.typeThesisen_US
dc.contributor.departmentAerospace and Ocean Engineeringen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineAerospace and Ocean Engineeringen_US
dc.contributor.committeechairWoolsey, Craig A.en_US
dc.contributor.committeememberNeu, Wayne L.en_US
dc.contributor.committeememberMcCue-Weil, Leigh S.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-06172005-114444/en_US
dc.date.sdate2005-06-17en_US
dc.date.rdate2005-07-07
dc.date.adate2005-07-07en_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record