Abstract
Variation modes of avian wings offer large-scale morphing aircraft an effective approach for solving problems such as the mass center shift in longitudinal trim and control system design during the morphing process. In this paper, a numerical method is established for fully understanding the influence of combined morphing on roll efficiency of a biomimetic wing unmanned aerial vehicle (UAV) from the perspective of aerodynamic change, system convergence time and aerodynamic energy consumption. Analysis and simulation results show that the biomimetic wing provides effective measures to improve the mission execution efficiency of UAV. System oscillation can obviously be reduced with asymmetric sweep angle change as the supervisory control surface for pure roll maneuver, and actuators require higher output power than that with the single deflection of the flexible trailing edge (Flex-TE). In addition, for aircraft design, a larger mass ratio of the inner wing is beneficial to enhance system stability. Energy consumption of wing and Flex-TE show laws of first increasing and then decreasing along the spanwise direction during the morphing process. For actuators of the Flex-TE, the output power of units 1 to 15 should higher than other spanwise units. For the sweep angle generalized control surface, the maximum value of energy consumption per unit time is located near the 20-th spanwise unit.
Highlights
The complexity of future combat missions requires aircraft to keep high efficiency in multiple conditions
This study focuses on studying the influence of biomimetic morphing on roll efficiency of redundant control surfaces of a biomimetic wing unmanned aerial vehicle (UAV) from the perspective of the change of aerodynamic, system convergence time and aerodynamic energy consumption
On account of the larger roll moment under the same lift, the control priority of flexible trailing edge (Flex-TE) is higher than the sweep angle control surface for roll maneuver in most cases
Summary
The associate editor coordinating the review of this manuscript and approving it for publication was Jesus Felez. H. Ma et al.: Efficiency Change of Control Surface of a Biomimetic Wing Morphing UAV. SUBSCRIPTS AND SUPERSCRIPTS rel Additional relative motion within the system w Wake vortex ind Effect of vortex induce velocity i,j Wing vortex cell number in spanwise and chordwise direction TE Trailing edge HT Horizontal tail max The maximum value in Inner wing part out Outer wing part R Right wing L Left wing
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