Abstract
A flight test platform is designed to conduct an experimental study on the body freedom flutter of a BWB flying wing, and a flight test is performed by using the proposed platform. A finite element model of structural dynamics is built, and unsteady aerodynamics and aeroelastic characteristics of the flying wing are analyzed by the doublet lattice method and g-method, respectively. Based on the foregoing analyses, a low-cost and low-risk flying-wing test platform is designed and manufactured. Then, the ground vibration test is implemented, and according to its results, the structural dynamics model is updated. The flight test campaign shows that the body freedom flutter occurs at low flight speed, which is consistent with the updated analytical result. Finally, an active flutter suppression controller is designed using a genetic algorithm for the developed flying wing for future tests, considering the gains and sensor location as design parameters. The open- and closed-loop analyses in time- and frequency-domain analyses demonstrate that the designed controller can improve the instability boundary of the closed-loop system effectively.
Highlights
Aerospace 2021, 8, 390. https://Compared with conventional aircraft, flying wings have a higher lift–drag ratio and better stealth capability [1,2], which have become a research hotspot of advanced aircraft in recent years [3]
Due to the particularity of the flutter, aeroelastic analyses are very important during the aircraft design process [6], by which we can determine the flutter characteristics and check if the performance of the vehicle meets the design requirements
20b, we hardly find anynonlinearity noticeable frequency rethe flutterspectrum mode obtained the flight testcan
Summary
Aerospace 2021, 8, 390. https://Compared with conventional aircraft, flying wings have a higher lift–drag ratio and better stealth capability [1,2], which have become a research hotspot of advanced aircraft in recent years [3]. BFF badly affects the handling performance and even leads to the disintegration of flying wings [4,5]. The studies on aeroelastic characteristics of flying wings include the flutter mechanism investigation [7,8], passive flutter suppression [9,10], and active flutter suppression (AFS) [11,12]. The. Based on the foregoing analyses, the manufacturing and assembly of the flying wing. Based on the foregoing analyses, the manufacturing and assembly of the flying wing were completed. In order to improve the reliability of the propulsion system, balsa wood surfaces and wings. In order to improve the reliability propulsion system, wood was used to strengthen the connection between thethe wing surface and base
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