Transactions of Nanjing University of Aeronautics & Astronautics
Longitudinal Modeling and Aerodynamic Evaluation of Morphing Aircraft with Symmetric Folding Wing Tips
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Abstract:
To study the change of aerodynamic characteristics of the spanwise adaptive wing with the folding angle， a kind of folding wing tip morphing aircraft， the modified Cessna 550 aircraft with shape memory alloys as hinge actuators， is considered. A novel modeling scheme is proposed based on the variable aerodynamic parameters about the folding angles. This kind of modeling scheme can explicitly account for changes in aerodynamic properties resulting from folding motion of symmetrical tip of the wing. To explore how folding motion will influence the aerodynamic performances of the aircraft， the computational fluid dynamics （CFD） is employed to build aircraft models and obtain aerodynamic coefficients under different folding angles of the wing tip. The aerodynamic parameters about the folding angles are specified through the curve fitting for obtaining the numeric nonlinear models. The taking-off， maneuvering and landing performances under different folding angles are analyzed to select the best morphing strategy and obtain the best aerodynamic performance. Longitudinal steady stability analysis is presented to validate the feasibility of the proposed morphing strategy.
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Project Supported:
This work was supported in part by the National Natural Science Foundation of China （No. 62173179）， the Postgraduate Research & Practice Innovation Program of Nanjing University of Aeronautics and Astronautics （No.xcxjh20210340）， the Research Fund of State Key Laboratory of Mechanics and Control of Mechanical Structures （No.MCMS-I-0121G03）， and the Youth Science and Technology Innovation Fund of the Fundamental Research Funds for the Central University （No.NS2021026）. The authors realize that the time and space available for a review of such an ambitious subject are limited and， thus， regretfully， we are unable to cover many important contributions.
Clc Number:
TP273
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