2 April 2015 Unified electrohydroelastic investigation of underwater energy harvesting and dynamic actuation by incorporating Morison's equation
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Abstract
In this work, Macro-Fiber Composite (MFC)-based piezoelectric structures are employed for underwater mechanical base excitation (vibration energy harvesting) and electrical biomimetic actuation in bending operation at low frequencies. The MFC technology (fiber-based piezoelectric composites with interdigitated electrodes) exploits the effective 33-mode of piezoelectricity and strikes a balance between structural deformation and force levels for actuation to use in underwater locomotion, in addition to offering high power density for energy harvesting to enable battery-less underwater sensors. Following in-air electroelastic composite model development, it is aimed to establish semianalytical models that can predict the underwater dynamics of thin MFC cantilevers for different length-to-width aspect ratios. In-air analytical electroelastic dynamics of MFCs is therefore coupled with added mass and nonlinear hydrodynamic damping effects of fluid to describe the underwater electrohydroelastic dynamics in harvesting and actuation. To this end, passive plates of different aspect ratios are tested to extract and explore the repeatability of the inertia and drag coefficients in Morison’s equation. The focus is placed on the first two bending modes in this semianalytical approach. Additionally, nonlinear dependence of the output power density to aspect ratio is characterized theoretically and experimentally in the underwater base excitation problem.
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S. Shahab, A. Erturk, "Unified electrohydroelastic investigation of underwater energy harvesting and dynamic actuation by incorporating Morison's equation", Proc. SPIE 9431, Active and Passive Smart Structures and Integrated Systems 2015, 94310C (2 April 2015); doi: 10.1117/12.2084373; https://doi.org/10.1117/12.2084373
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