Design of long-endurance unmanned airplanes incorporating solar and fuel cell propulsion

Youngblood, J. W.; Talay, Theodore A.; Pegg, R. J.

doi:10.2514/6.1984-1430

Cited by 39 publications

(23 citation statements)

References 1 publication

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“…In recent years, the development of lighter and more efficient transport aircraft has led to a widespread increase of the emphasis put on atmospheric load reduction, leading to commercial airplanes (e.g., the Airbus A380 and the Boeing 787) natively equipped with active controllers for load alleviation and comfort enhancement [7]. Moreover, new classes of vehicles, such as high-altitude long-endurance (HALE) aircraft [11] and SensorCraft [12], because of their stronger weight reduction specifications, made the use of active GLA systems mandatory as well. Finally, an aggressive combination of maneuver and gust load alleviation technologies could be necessary in the case of more advanced aerodynamic designs, such as those based on the natural laminar flow concept, holding the potential of significantly improving both the weight and the aerodynamic terms of the wellknown Breguet range equation.…”

Section: Introductionmentioning

confidence: 99%

Gust Load Alleviation for a Regional Aircraft Through a Static Output Feedback

Fonte

Ricci

Mantegazza

2015

Journal of Aircraft

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The paper presents the design of a symmetric, active, gust load alleviation system for a regional transport aircraft, based on a static output feedback with a constrained structure. The design is carried out on a comprehensive finite state aeroservoelastic model, including sensor units and actuator transfer functions, and verified by taking into account saturated control positions, rates, and hinge moments. The controller is designed within a quadratic optimal framework, through a second-order Hessian-based optimization algorithm, exploiting block diagonal Schur transformations of the closed-loop state equations and performance weightings. An accurately chosen worst discrete gust and a reference flight condition provide a baseline design, which is significantly effective in alleviating continuous turbulence loads. Such a reference design proves itself robust enough to alleviate atmospheric loads over the complete flight envelope and is eventually further improved and robustified through a simple bilinear q∞−M∞ algebraic scheduling

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Section: Introductionmentioning

confidence: 99%

Gust Load Alleviation for a Regional Aircraft Through a Static Output Feedback

Fonte

Ricci

Mantegazza

2015

Journal of Aircraft

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“…Also, propulsion systems with fuel cells and solar cells are considered eco-friendly, since they do not cause a problem of CO 2 or harmful gas emission. 3 The…”

Section: Introductionmentioning

confidence: 99%

Computational Analysis of the Aerodynamic Performance of a Long-Endurance UAV

Jin¹,

Lee²

2014

International Journal of Aeronautical and Space Sciences

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This paper presents the computational aerodynamic analysis of a long-endurance UAV that was developed by the Korea Aerospace Research Institute (KARI), named EAV-2. EAV-2 is a technical demonstrator of aerodynamically efficient design, as well as a hybrid electric-propulsion system for future long-endurance UAVs. We evaluated the aerodynamic characteristics of six low-Reynolds number airfoils, using a panel method code, XFOIL, to select an optimal airfoil for the long-endurance mission of EAV-2. The computational results by a CFD code, FLUENT, suggested that the aerodynamic performance of EAV-2 would be notably improved after adopting SG6043 airfoil, and modifying the fuselage design. This reduced the total drag by 43%, compared to that of a previous KARI model, EAV-1, at the target lift of CL=1.0. Also, we achieved a drag reduction of approximately 14% by means of the low-drag fuselage configuration.

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“…The conceptual design of the UAV was carried out taking into account the optimal performance of the amount of harnessing solar energy achieved by the UAVs (Cestino 2006;Youngblood et al 1984), which depends on the following environmental and technical factors: seasons of the year, due to the amount of sunlight that is exposed on the Earth's surface; time of the day, as a result of the sunlight intensity increase from sunrise until noon; the sun irradiance, exploitable in some periods of the day; efficiency of the photovoltaic cell, in which typical polycrystalline cell efficiencies are between 13 and 18%; and the surface area of the solar cells, directly proportional to the amount of electric power supplied. Therefore, a larger wing surface was necessary to get better results from electrical power generation.…”

Section: Introductionmentioning

confidence: 99%

Design and Manufacture of a Solar-Powered Unmanned Aerial Vehicle for Civilian Surveillance Missions

Betancourth

Villamarín

Ríos

et al. 2016

J.Aerosp. Technol. Manag.

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In order to promote the development of renewable energy and take advantage of the new technologies for the benefit of sustainability, both the design and the manufacture methodologies of an experimental solarpowered unmanned aerial vehicle for civilian surveillance applications are presented. Throughout the document, it is provided the historical process around the development of the aircraft. Therefore, in the first part, it is shown the aerodynamic design, which includes the 2-D and 3-D analyses of the wing platform using numerical and experimental methods, the analytical design of the empennage configuration, and the main characteristics of the performance analysis. In addition, major systems and components that characterize the aircraft are described, such as the photovoltaic solar cells configuration as well as the electronics and control system into the unmanned aerial vehicle. Lastly, the modeling for the weights distribution of the components was carried out in a preliminary test using CAD tools. Thus, it was obtained a suitable process for the manufacture of the unmanned aerial vehicle, considering that the purpose of the aircraft is to be as light and aerodynamic as possible to accomplish the mission for which it was created.

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Design of long-endurance unmanned airplanes incorporating solar and fuel cell propulsion

Cited by 39 publications

References 1 publication

Gust Load Alleviation for a Regional Aircraft Through a Static Output Feedback

Gust Load Alleviation for a Regional Aircraft Through a Static Output Feedback

Computational Analysis of the Aerodynamic Performance of a Long-Endurance UAV

Design and Manufacture of a Solar-Powered Unmanned Aerial Vehicle for Civilian Surveillance Missions

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