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Testing Momentum Enhancement Of Ribbon Fin Based Propulsion Using A Robotic Model With An Adjustable Body

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Date Issued:
2016
Summary:
A robotic ribbon fin with twelve independent fin rays, elastic fin membrane, and a body of adjustable height was developed for this thesis specifically to test the 1990 theory put forth by Lighthill and Blake that a multiplicative propulsive enhancement exists for Gymnotiform and Balisiform swimmers based on the ratio of body and fin heights. Until now, the theory has not been experimentally tested. Proof of such a momentum enhancement could have a profound effect on unmanned underwater vehicle design and shed light on the evolutionary advantage to body-fin ratios found in nature, shown as optimal for momentum enhancement in Lighthill and Blake’s theory. Thrust tests for various body heights were conducted in a recirculating flow tank at different flow speeds and fin flapping frequencies. When comparing different body heights at different frequencies to a ’no-body’ thrust test case at each frequency no momentum enhancement factor was found. Data in this thesis indicate there is no momentum enhancement factor due to the presence of a body on top of an undulating fin.
Title: Testing Momentum Enhancement Of Ribbon Fin Based Propulsion Using A Robotic Model With An Adjustable Body.
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Name(s): English, Ian L., author
Curet, Oscar M., Thesis advisor
Florida Atlantic University, Degree grantor
College of Engineering and Computer Science
Department of Ocean and Mechanical Engineering
Type of Resource: text
Genre: Electronic Thesis Or Dissertation
Date Created: 2016
Date Issued: 2016
Publisher: Florida Atlantic University
Place of Publication: Boca Raton, Fla.
Physical Form: application/pdf
Extent: 89 p.
Language(s): English
Summary: A robotic ribbon fin with twelve independent fin rays, elastic fin membrane, and a body of adjustable height was developed for this thesis specifically to test the 1990 theory put forth by Lighthill and Blake that a multiplicative propulsive enhancement exists for Gymnotiform and Balisiform swimmers based on the ratio of body and fin heights. Until now, the theory has not been experimentally tested. Proof of such a momentum enhancement could have a profound effect on unmanned underwater vehicle design and shed light on the evolutionary advantage to body-fin ratios found in nature, shown as optimal for momentum enhancement in Lighthill and Blake’s theory. Thrust tests for various body heights were conducted in a recirculating flow tank at different flow speeds and fin flapping frequencies. When comparing different body heights at different frequencies to a ’no-body’ thrust test case at each frequency no momentum enhancement factor was found. Data in this thesis indicate there is no momentum enhancement factor due to the presence of a body on top of an undulating fin.
Identifier: FA00004682 (IID)
Degree granted: Thesis (M.S.)--Florida Atlantic University, 2016.
Collection: FAU Electronic Theses and Dissertations Collection
Note(s): Includes bibliography.
Subject(s): Animal locomotion
Animal mechanics
Biomechanics
Computers, Special purpose
Oceanographic submersibles
Robotics
Held by: Florida Atlantic University Libraries
Sublocation: Digital Library
Links: http://purl.flvc.org/fau/fd/FA00004682
Persistent Link to This Record: http://purl.flvc.org/fau/fd/FA00004682
Use and Reproduction: Copyright © is held by the author, with permission granted to Florida Atlantic University to digitize, archive and distribute this item for non-profit research and educational purposes. Any reuse of this item in excess of fair use or other copyright exemptions requires permission of the copyright holder.
Use and Reproduction: http://rightsstatements.org/vocab/InC/1.0/
Host Institution: FAU
Is Part of Series: Florida Atlantic University Digital Library Collections.