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Piezoelectric energy harvesting from morphing wing motions for micro air vehicles

Theoretical & Applied Mechanics Letters 2013年第5期3卷 69-72页

作者： Abdessattar Abdelkefi Mehdi Ghommem Department of Engineering Science and Mechanics Virginia TechBlacksburg Virginia 24061 USA Center for Numerical Porous Media (NumPor) King Abdullah University of Science and TechnologyThuwal 23955-6900 Kingdom of Saudi Arabia

Wing flapping and morphing can be very beneficial to managing the weight of micro air vehicles through coupling the aerodynamic forces with stability and control. In this letter, harvesting energy from the wing morphing is studied to power cameras, sensors, or communication devices of micro air vehicles and to aid in the management of their power. The aerodynamic loads on flapping wings are simulated using a three-dimensional unsteady vortex lattice method. Active wing shape morphing is considered to enhance the performance of the flapping motion. A gradient-based optimization algorithm is used to pinpoint the optimal kinematics maximizing the propellent efficiency. To benefit from the wing deformation, we place piezoelectric layers near the wing roots. Gauss law is used to estimate the electrical harvested power. We demonstrate that enough power can be generated to operate a camera. Numerical analysis shows the feasibility of exploiting wing morphing to harvest energy and improving the design and performance of micro air vehicles.

关键词： energy harvesting piezoelectric material micro air vehicles wing morphing

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Model Identification of a micro air Vehicle

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Journal of Bionic Engineering 2007年第4期4卷 227-236页

作者： Jorge Nio Flavius Mitrache Peter Cosyn Robin De Keyser Department of Electrical Energy Systems and Automation Ghent University Technologiepark 913 9052 Ghent Belgium Department of Flow Heat and Combustion Mechanics Ghent University Sint-Pietersnieuwstraat 41 9000 Ghent Belgium

This paper is focused on the model identification of a micro air Vehicle （MAV） in straight steady flight condition. The identification is based on input-output data collected from flight tests using both frequency and time dorrtain techniques. The vehicle is an in-house 40 cm wingspan airplane. Because of the complex coupled, multivariable and nonlinear dynamics of the aircraft, linear SISO structures for both the lateral and longitudinal models around a reference state were derived. The aim of the identification is to provide models that can be used in future development of control techniques for the MAV.

关键词： micro air vehicles system identification flight tests

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Computational aerodynamics of low Reynolds number plunging,pitching and flexible wings for MAV applications

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Acta Mechanica Sinica 2008年第4期24卷 351-373页

作者： W.Shyy Y.Lian J.Tang H.Liu P.Trizila B.Stanford L.Bernal C.Cesnik P.Friedmann P.Ifju Department of Aerospace Engineering University of Michigan Ann Arbor MI 48109 USA Graduate School of Engineering Chiba University Chiba 263-8522. Japan Department of Mechanical and Aerospace Engineering University of Florida Gainesville FL 32611 USA

micro air vehicles （MAV＇s） have the potential to revolutionize our sensing and information gathering capabilities in environmental monitoring and homeland security areas. Due to the MAV＇s＇ small size, flight regime, and modes of operation, significant scientific advancement will be needed to create this revolutionary capability. Aerodynamics, structural dynamics, and flight dynamics of natural flyers intersects with some of the richest problems in MAV＇s, inclu- ding massively unsteady three-dimensional separation, transition in boundary layers and shear layers, vortical flows and bluff body flows, unsteady flight environment, aeroelasticity, and nonlinear and adaptive control are just a few examples. A challenge is that the scaling of both fluid dynamics and structural dynamics between smaller natural flyer and practical flying hardware/lab experiment （larger dimension） is fundamentally difficult. In this paper, we offer an overview of the challenges and issues, along with sample results illustrating some of the efforts made from a computational modeling angle.

关键词： micro air vehicles Aerodynamics Flexible wings Low Reynolds number

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