Item Details

The Influence of the Peduncle on Swimming Performance in Biological Tuna and Tuna-Inspired Artificial Propulsors

Lewis, Gregory
Format
Thesis/Dissertation; Online
Author
Lewis, Gregory
Advisor
Bart-Smith, Hilary
Abstract
Designers of unmanned underwater vehicles (UUVs) are increasingly turning to aquatic animals that use lift-based propulsion for inspiration. This is because of the significant advantage they have over traditional rotary propeller systems, such as efficiency and maneuverability. Thunniforms have been identified as fast, economical swimmers. If the performance of the next generation of UUVs is to achieve these biological performance metrics, it is essential that we understand and quantify the key mechanisms that contribute to their superior swimming performance. Significant efforts have been directed toward quantifying the morphometrics, kinematics, and material properties of thunniform swimmers. Through careful dissection, it was observed that the peduncle region of tuna and tuna-like fish allows for a degree a freedom. This motivated studies of the biology and artificial propulsors to quantify the role this subsystem has on speed, work done, and economy. Results show that the peduncle joint significantly improves performance: boosting speed and decreasing power compared to a fish without it and was reproduced in an artificial tuna-like platform. Additionally, modulating the joint stiffness and bend angle has profound effects on performance with preferred kinematics depending on swimming speed. These findings can inform the tail design of a high-performing UUV based on the biomechanics of a tuna.
Language
English
Date Received
20170425
Published
University of Virginia, Department of Mechanical and Aerospace Engineering, MS (Master of Science), 2017
Published Date
2017-04-25
Degree
MS (Master of Science)
Collection
Libra ETD Repository
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