Flight Stability of Rigid Wing Airborne Wind Energy Systems

The flight mechanics of rigid wing Airborne Wind Energy Systems (AWESs) is fundamentally different from the one of conventional aircrafts. The presence of the tether largely impacts the system dynamics, making the flying craft to experience forces which can be an order of magnitude larger than those...

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Autores principales:	Filippo Trevisi, Alessandro Croce, Carlo E. D. Riboldi
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	AWES flight dynamics dynamic stability tethered flight eigenvalue analysis modeling for control Technology T
Acceso en línea:	https://doaj.org/article/7841a295658f4302bb77a14a4a4a6114
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spelling	oai:doaj.org-article:7841a295658f4302bb77a14a4a4a61142021-11-25T17:28:05ZFlight Stability of Rigid Wing Airborne Wind Energy Systems10.3390/en142277041996-1073https://doaj.org/article/7841a295658f4302bb77a14a4a4a61142021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/22/7704https://doaj.org/toc/1996-1073The flight mechanics of rigid wing Airborne Wind Energy Systems (AWESs) is fundamentally different from the one of conventional aircrafts. The presence of the tether largely impacts the system dynamics, making the flying craft to experience forces which can be an order of magnitude larger than those experienced by conventional aircrafts. Moreover, an AWES needs to deal with a sustained yet unpredictable wind, and the ensuing requirements for flight maneuvers in order to achieve prescribed control and power production goals. A way to maximize energy capture while facing disturbances without requiring an excessive contribution from active control is that of suitably designing the AWES craft to feature good flight dynamics characteristics. In this study, a baseline circular flight path is considered, and a steady state condition is defined by modeling all fluctuating dynamic terms over the flight loop as disturbances. In-flight stability is studied by linearizing the equations of motion on this baseline trajectory. In populating a linearized dynamic model, analytical derivatives of external forces are computed by applying well-known aerodynamic theories, allowing for a fast formulation of the linearized problem and for a quantitative understanding of how design parameters influence stability. A complete eigenanalysis of an example tethered system is carried out, showing that a stable-by-design AWES can be obtained and how. With the help of the example, it is shown how conventional aircraft eigenmodes are modified for an AWES and new eigenmodes, typical of AWESs, are introduced and explained. The modeling approach presented in the paper sets the basis for a holistic design of AWES that will follow this work.Filippo TrevisiAlessandro CroceCarlo E. D. RiboldiMDPI AGarticleAWESflight dynamicsdynamic stabilitytethered flighteigenvalue analysismodeling for controlTechnologyTENEnergies, Vol 14, Iss 7704, p 7704 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	AWES flight dynamics dynamic stability tethered flight eigenvalue analysis modeling for control Technology T
spellingShingle	AWES flight dynamics dynamic stability tethered flight eigenvalue analysis modeling for control Technology T Filippo Trevisi Alessandro Croce Carlo E. D. Riboldi Flight Stability of Rigid Wing Airborne Wind Energy Systems
description	The flight mechanics of rigid wing Airborne Wind Energy Systems (AWESs) is fundamentally different from the one of conventional aircrafts. The presence of the tether largely impacts the system dynamics, making the flying craft to experience forces which can be an order of magnitude larger than those experienced by conventional aircrafts. Moreover, an AWES needs to deal with a sustained yet unpredictable wind, and the ensuing requirements for flight maneuvers in order to achieve prescribed control and power production goals. A way to maximize energy capture while facing disturbances without requiring an excessive contribution from active control is that of suitably designing the AWES craft to feature good flight dynamics characteristics. In this study, a baseline circular flight path is considered, and a steady state condition is defined by modeling all fluctuating dynamic terms over the flight loop as disturbances. In-flight stability is studied by linearizing the equations of motion on this baseline trajectory. In populating a linearized dynamic model, analytical derivatives of external forces are computed by applying well-known aerodynamic theories, allowing for a fast formulation of the linearized problem and for a quantitative understanding of how design parameters influence stability. A complete eigenanalysis of an example tethered system is carried out, showing that a stable-by-design AWES can be obtained and how. With the help of the example, it is shown how conventional aircraft eigenmodes are modified for an AWES and new eigenmodes, typical of AWESs, are introduced and explained. The modeling approach presented in the paper sets the basis for a holistic design of AWES that will follow this work.
format	article
author	Filippo Trevisi Alessandro Croce Carlo E. D. Riboldi
author_facet	Filippo Trevisi Alessandro Croce Carlo E. D. Riboldi
author_sort	Filippo Trevisi
title	Flight Stability of Rigid Wing Airborne Wind Energy Systems
title_short	Flight Stability of Rigid Wing Airborne Wind Energy Systems
title_full	Flight Stability of Rigid Wing Airborne Wind Energy Systems
title_fullStr	Flight Stability of Rigid Wing Airborne Wind Energy Systems
title_full_unstemmed	Flight Stability of Rigid Wing Airborne Wind Energy Systems
title_sort	flight stability of rigid wing airborne wind energy systems
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/7841a295658f4302bb77a14a4a4a6114
work_keys_str_mv	AT filippotrevisi flightstabilityofrigidwingairbornewindenergysystems AT alessandrocroce flightstabilityofrigidwingairbornewindenergysystems AT carloedriboldi flightstabilityofrigidwingairbornewindenergysystems
_version_	1718412293726797824

Flight Stability of Rigid Wing Airborne Wind Energy Systems

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