Bio-inspired hydrodynamic thrust generation using piezoelectric transduction has recently been explored using Macro-Fiber Composite (MFC) actuators. The MFC technology strikes a balance between the actuation force and structural deformation levels for effective swimming performance, and additionally offers geometric scalability, silent operation, and ease of fabrication. Recently we have shown that mean thrust levels comparable to biological fish of similar size can be achieved using MFC fins. The present work investigates the effect of length-to-width (L/b) aspect ratio on the hydrodynamic thrust generation performance of MFC cantilever fins by accounting for the power consumption level. It is known that the hydrodynamic inertia and drag coefficients are controlled by the aspect ratio especially for L/b<5. The three MFC bimorph fins explored in this work have the aspect ratios of 2.1, 3.9, and 5.4. A nonlinear electrohydroelastic model is employed to extract the inertia and drag coefficients from the vibration response to harmonic actuation for the first bending mode. Experiments are then conducted for various actuation voltage levels to quantify the mean thrust resultant and power consumption levels for different aspect ratios. Variation of the thrust coefficient of the MFC fins with aspect ratio is also modeled and validated.
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ASME 2015 Conference on Smart Materials, Adaptive Structures and Intelligent Systems
September 21–23, 2015
Colorado Springs, Colorado, USA
Conference Sponsors:
- Aerospace Division
ISBN:
978-0-7918-5730-4
PROCEEDINGS PAPER
Hydrodynamic Thrust Generation and Power Consumption Investigations for Piezoelectric Fins With Different Aspect Ratios
Shima Shahab,
Shima Shahab
Georgia Institute of Technology, Atlanta, GA
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David Tan,
David Tan
Georgia Institute of Technology, Atlanta, GA
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Alper Erturk
Alper Erturk
Georgia Institute of Technology, Atlanta, GA
Search for other works by this author on:
Shima Shahab
Georgia Institute of Technology, Atlanta, GA
David Tan
Georgia Institute of Technology, Atlanta, GA
Alper Erturk
Georgia Institute of Technology, Atlanta, GA
Paper No:
SMASIS2015-9093, V002T06A011; 11 pages
Published Online:
January 11, 2016
Citation
Shahab, S, Tan, D, & Erturk, A. "Hydrodynamic Thrust Generation and Power Consumption Investigations for Piezoelectric Fins With Different Aspect Ratios." Proceedings of the ASME 2015 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. Volume 2: Integrated System Design and Implementation; Structural Health Monitoring; Bioinspired Smart Materials and Systems; Energy Harvesting. Colorado Springs, Colorado, USA. September 21–23, 2015. V002T06A011. ASME. https://doi.org/10.1115/SMASIS2015-9093
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