TY - GEN
T1 - Asapp
T2 - AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2021
AU - Ajaj, Rafic M.
AU - Parancheerivilakkathil, Muhammed S.
AU - Amoozgar, Mohammadreza
N1 - Funding Information:
The work presented herein has been partially funded by Abu Dhabi Education Council Award for Research Excellence Program (AARE 2019) through grant number AARE19-213.
Publisher Copyright:
© 2021, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.
PY - 2021
Y1 - 2021
N2 - This paper presents the development of a novel multi-objective polymorphing wing capable of Active Span morphing And Passive Pitching (ASAPP) for small UAVs. The wingspan can be actively extended by up to 25% to enhance aerodynamic efficiency whilst the passive pitch is utilized to alleviate gust and maneuver loads at off-design conditions and shift the lift distribution during 1-g flight. To integrate the two degrees of freedom into a single wing design, each side of the wing is split into an inboard segment and an outboard segment. The inboard segment is used for span extension whilst the outboard segment is used for passive pitch. The inboard segment consists of a main spar that can translate in the spanwise direction. Flexible skin is used to cover the inboard segment and maintain the aerodynamic shape. The skin passes the aerodynamic loads to the main spar through a number of ribs that can slide on the spar, using bearings, to maintain uniform strain in the skin. A linear actuator located along the fuselage length is used to drive the starboard and port spars. The inboard and outboard segments are connected by an overlapping spar surrounded by a torsional spring. The overlapping spar is located ahead of the aerodynamic center of the outboard segment to facilitate passive pitch. The entire outboard segment rotates around the overlapping spar where the maximum pitch angle is determined by the stiffness of the torsional spring and the magnitude of the aerodynamic loads. The aero-structural design, analysis, and sizing of the ASAPP wing are detailed here.
AB - This paper presents the development of a novel multi-objective polymorphing wing capable of Active Span morphing And Passive Pitching (ASAPP) for small UAVs. The wingspan can be actively extended by up to 25% to enhance aerodynamic efficiency whilst the passive pitch is utilized to alleviate gust and maneuver loads at off-design conditions and shift the lift distribution during 1-g flight. To integrate the two degrees of freedom into a single wing design, each side of the wing is split into an inboard segment and an outboard segment. The inboard segment is used for span extension whilst the outboard segment is used for passive pitch. The inboard segment consists of a main spar that can translate in the spanwise direction. Flexible skin is used to cover the inboard segment and maintain the aerodynamic shape. The skin passes the aerodynamic loads to the main spar through a number of ribs that can slide on the spar, using bearings, to maintain uniform strain in the skin. A linear actuator located along the fuselage length is used to drive the starboard and port spars. The inboard and outboard segments are connected by an overlapping spar surrounded by a torsional spring. The overlapping spar is located ahead of the aerodynamic center of the outboard segment to facilitate passive pitch. The entire outboard segment rotates around the overlapping spar where the maximum pitch angle is determined by the stiffness of the torsional spring and the magnitude of the aerodynamic loads. The aero-structural design, analysis, and sizing of the ASAPP wing are detailed here.
UR - http://www.scopus.com/inward/record.url?scp=85100298889&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:85100298889
SN - 9781624106095
T3 - AIAA Scitech 2021 Forum
SP - 1
EP - 19
BT - AIAA Scitech 2021 Forum
Y2 - 11 January 2021 through 15 January 2021
ER -