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Author: National Aeronautics and Space Adm Nasa
Publisher: Independently Published
ISBN: 9781723832284
Category : Science
Languages : en
Pages : 50
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Book Description
Analytical benefits of variable-camber capability on subsonic transport aircraft are explored. Using aerodynamic performance models, including drag as a function of deflection angle for control surfaces of interest, optimal performance benefits of variable camber are calculated. Results demonstrate that if all wing trailing-edge surfaces are available for optimization, drag can be significantly reduced at most points within the flight envelope. The optimization approach developed and illustrated for flight uses variable camber for optimization of aerodynamic efficiency (maximizing the lift-to-drag ratio). Most transport aircraft have significant latent capability in this area. Wing camber control that can affect performance optimization for transport aircraft includes symmetric use of ailerons and flaps. In this paper, drag characteristics for aileron and flap deflections are computed based on analytical and wind-tunnel data. All calculations based on predictions for the subject aircraft and the optimal surface deflection are obtained by simple interpolation for given conditions. An algorithm is also presented for computation of optimal surface deflection for given conditions. Benefits of variable camber for a transport configuration using a simple trailing-edge control surface system can approach more than 10 percent, especially for nonstandard flight conditions. In the cruise regime, the benefit is 1-3 percent.Bolonkin, Alexander and Gilyard, Glenn B.Armstrong Flight Research CenterWING CAMBER; WIND TUNNEL TESTS; TRANSPORT AIRCRAFT; ADAPTIVE CONTROL; CAMBERED WINGS; AERODYNAMIC CHARACTERISTICS; AIRCRAFT PERFORMANCE; COMMERCIAL AIRCRAFT; LIFT DRAG RATIO; SUBSONIC SPEED; CONTROL SURFACES; TRAILING EDGES; AILERONS; ALGORITHMS; MACH NUMBER; PITCHING MOMENTS; FLIGHT OPTIMIZATION
Author: National Aeronautics and Space Adm Nasa
Publisher: Independently Published
ISBN: 9781723832284
Category : Science
Languages : en
Pages : 50
Get Book Here
Book Description
Analytical benefits of variable-camber capability on subsonic transport aircraft are explored. Using aerodynamic performance models, including drag as a function of deflection angle for control surfaces of interest, optimal performance benefits of variable camber are calculated. Results demonstrate that if all wing trailing-edge surfaces are available for optimization, drag can be significantly reduced at most points within the flight envelope. The optimization approach developed and illustrated for flight uses variable camber for optimization of aerodynamic efficiency (maximizing the lift-to-drag ratio). Most transport aircraft have significant latent capability in this area. Wing camber control that can affect performance optimization for transport aircraft includes symmetric use of ailerons and flaps. In this paper, drag characteristics for aileron and flap deflections are computed based on analytical and wind-tunnel data. All calculations based on predictions for the subject aircraft and the optimal surface deflection are obtained by simple interpolation for given conditions. An algorithm is also presented for computation of optimal surface deflection for given conditions. Benefits of variable camber for a transport configuration using a simple trailing-edge control surface system can approach more than 10 percent, especially for nonstandard flight conditions. In the cruise regime, the benefit is 1-3 percent.Bolonkin, Alexander and Gilyard, Glenn B.Armstrong Flight Research CenterWING CAMBER; WIND TUNNEL TESTS; TRANSPORT AIRCRAFT; ADAPTIVE CONTROL; CAMBERED WINGS; AERODYNAMIC CHARACTERISTICS; AIRCRAFT PERFORMANCE; COMMERCIAL AIRCRAFT; LIFT DRAG RATIO; SUBSONIC SPEED; CONTROL SURFACES; TRAILING EDGES; AILERONS; ALGORITHMS; MACH NUMBER; PITCHING MOMENTS; FLIGHT OPTIMIZATION
Author: Alexander Bolonkin
Publisher:
ISBN:
Category :
Languages : en
Pages : 52
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Book Description
Author: Alexander Bolonkin
Publisher:
ISBN:
Category :
Languages : en
Pages : 50
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Book Description
Author: Alexander Bolonkin
Publisher:
ISBN:
Category : Adaptive control systems
Languages : en
Pages : 40
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Book Description
Author: John W. Smith
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 48
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Aerodynamic investigations have shown' that variable camber wings (VCW) for transport aircraft have considerable potential in terms of improving aircraft performance and enhancing their operational flexibility. In order to justify these benefits it is essential that the camber varying system is structurally and mechanically feasible. This research examined the feasibility of providing variable camber to two supercritical aerofoil sections of different'characteristics. The unique method of camber vaTiation was applied by rotating the forward and aft regions of the aerofoil on a circular arc and keeping the surface continuous and matching at their attachment to the main wing box. The change in camber thus increased the chord due to translational motion of the aforementioned regions. The geometries required for varying the forward camber by this method presented formidable design difficulties and no immediate solutions could be found. As a result, an alternative geometry was devised which accepts camber by simply drooping the nose region. A novel idea was developed for aft camber variation, which is considered to be universal for all supercritical aerofoil sections. The system utilises a tracking mechanism which guides a trailing edge element on a continuous arc. Surface continuity is provided by a flexible skin on the upper side and a spring loaded hinged panel on the under side. The flexible skin remains attached to the trailing edge element through a series of roller link arrangement which locate the skin in a separate guide rail. The large moment arm and therefore the increased torsional loads created due to the translational motion of the trailing edge element necessitated investigation of alternative deployment geometries. As a result two additional geometries were schemed. One had reduced radius of rotation and therefore reduced extension, while the other changed camber by drooping the aft region without any chordal extension. Since there was no aerodynamic evid.
Author: Sergio Ricci
Publisher: Butterworth-Heinemann
ISBN: 0081009690
Category : Technology & Engineering
Languages : en
Pages : 970
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Book Description
Morphing Wings Technologies: Large Commercial Aircraft and Civil Helicopters offers a fresh look at current research on morphing aircraft, including industry design, real manufactured prototypes and certification. This is an invaluable reference for students in the aeronautics and aerospace fields who need an introduction to the morphing discipline, as well as senior professionals seeking exposure to morphing potentialities. Practical applications of morphing devices are presented—from the challenge of conceptual design incorporating both structural and aerodynamic studies, to the most promising and potentially flyable solutions aimed at improving the performance of commercial aircraft and UAVs. Morphing aircraft are multi-role aircraft that change their external shape substantially to adapt to a changing mission environment during flight. The book consists of eight sections as well as an appendix which contains both updates on main systems evolution (skin, structure, actuator, sensor, and control systems) and a survey on the most significant achievements of integrated systems for large commercial aircraft. - Provides current worldwide status of morphing technologies, the industrial development expectations, and what is already available in terms of flying systems - Offers new perspectives on wing structure design and a new approach to general structural design - Discusses hot topics such as multifunctional materials and auxetic materials - Presents practical applications of morphing devices
Author: John W. Smith
Publisher:
ISBN:
Category :
Languages : en
Pages : 48
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Book Description
Author: A. J. Rao
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Xinguo Zhang
Publisher: Springer
ISBN: 981133305X
Category : Technology & Engineering
Languages : en
Pages : 3068
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Book Description
This book is a compilation of peer-reviewed papers from the 2018 Asia-Pacific International Symposium on Aerospace Technology (APISAT 2018). The symposium is a common endeavour between the four national aerospace societies in China, Australia, Korea and Japan, namely, the Chinese Society of Aeronautics and Astronautics (CSAA), Royal Aeronautical Society Australian Division (RAeS Australian Division), the Korean Society for Aeronautical and Space Sciences (KSAS) and the Japan Society for Aeronautical and Space Sciences (JSASS). APISAT is an annual event initiated in 2009 to provide an opportunity for researchers and engineers from Asia-Pacific countries to discuss current and future advanced topics in aeronautical and space engineering.
