A design framework for realizing multifunctional wings for flapping wing air vehicles using solar cells

dc.contributor.authorHolness, Alex E.
dc.contributor.authorSolheim, Hannah
dc.contributor.authorBruck, Hugh A.
dc.contributor.authorGupta, Satyandra K.
dc.descriptionPartial funding for Open Access provided by the UMD Libraries' Open Access Publishing Fund.
dc.description.abstractLong flight durations are highly desirable to expand mission capabilities for unmanned air systems and autonomous applications in particular. Flapping wing aerial vehicles are unmanned air system platforms offering several performance advantages over fixed wing and rotorcraft platforms, but are unable to reach comparable flight times when powered by batteries. One solution to this problem has been to integrate energy harvesting technologies in components, such as wings. To this end, a framework for designing flapping wing aerial vehicle using multifunctional wings using solar cells is described. This framework consists of: (1) modeling solar energy harvesting while flying, (2) determining the number of solar cells that meet flight power requirements, and (3) determining appropriate locations to accommodate the desired number of solar cells. A system model for flapping flight was also developed to predict payload capacity for carrying batteries to provide energy only for power spikes and to enable time-to-land safely in an area where batteries can recharge when the sun sets. The design framework was applied to a case study using flexible high-efficiency (>24%) solar cells on a flapping wing aerial vehicle platform, known as Robo Raven IIIv5, with the caveat that a powertrain with 81% efficiency is used in place of the current servos. A key finding was the fraction of solar flux incident on the wings during flapping was 0.63 at the lowest solar altitude. Using a 1.25 safety factor, the lowest value for the purposes of design will be 0.51. Wind tunnel measurements and aerodynamic modeling of the platform determined integrating solar cells in the wings resulted in a loss of thrust and greater drag, but the resulting payload capacity was unaffected because of a higher lift coefficient. A time-to-land of 2500 s was predicted, and the flight capability of the platform was validated in a netted test facility.en_US
dc.identifier.citationHolness, A. E., Solheim, H., Bruck, H. A., & Gupta, S. K. (2019). A design framework for realizing multifunctional wings for flapping wing air vehicles using solar cells. International Journal of Micro Air Vehicles. https://doi.org/10.1177/1756829319836279en_US
dc.publisherSAGE Publicationsen_US
dc.relation.isAvailableAtA. James Clark School of Engineeringen_us
dc.relation.isAvailableAtMechanical Engineeringen_us
dc.relation.isAvailableAtDigital Repository at the University of Marylanden_us
dc.relation.isAvailableAtUniversity of Maryland (College Park, MD)en_us
dc.subjectHigh-efficiency solar cellsen_US
dc.subjectflapping wing air vehiclesen_US
dc.subjectmultifunctional wingsen_US
dc.subjectenergy generation modelingen_US
dc.subjectsolar flux analysisen_US
dc.titleA design framework for realizing multifunctional wings for flapping wing air vehicles using solar cellsen_US


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