Shape reconstructions and morphing kinematics of an eagle during perching manoeuvres

doi:10.1088/1674-1056/ab610a

Abstract The key to high manoeuvre ability in bird flight lies in the combined morphing of wings and tail. The perching of a wild Haliaeetus Albicilla without running or wing flapping is recorded and investigated using a high-speed digital video. A shape reconstruction method is proposed to describe wing contours and tail contours during perching. The avian airfoil geometries of the Aquila Chrysaetos are extracted from noncontact surface measurements using a ROMBER 3D laser scanner. The wing planform, chord distribution and twist distribution are fitted in convenient analytical expressions to obtain a 3D wing geometry. A three-jointed arm model is proposed to associate with the 3D wing geometry, while a one-joint arm model is proposed to describe the kinematics of tail. Therefore, a 3D bird model is established. The perching sequences of the wild eagle are recaptured and regenerated with the proposed 3D bird model. A quasi-steady aerodynamic model is applied in the aerodynamic predictions, a four-step Adams-Bashforth method is used to calculate the ordinary differential equations, thus a BFGS based optimization method is established to predict the perching motions.

Keywords: large bird of prey shape reconstruction morphing kinematic perching

Received: 21 August 2019
Revised: 18 November 2019
Accepted manuscript online:

PACS:	47.32.cd	(Vortex stability and breakdown)
	47.32.Ff	(Separated flows)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 51705459) and the China Postdoctoral Science Foundation.

Corresponding Authors: Di Tang
E-mail: tangdi@zjut.edu.cn

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Di Tang(唐迪), Dawei Liu(刘大伟), Hai Zhu(朱海), Xipeng Huang(黄喜鹏), Zhongyong Fan(范忠勇), Mingxia Lei(雷鸣霞) Shape reconstructions and morphing kinematics of an eagle during perching manoeuvres 2020 Chin. Phys. B 29 024703

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Shape reconstructions and morphing kinematics of an eagle during perching manoeuvres

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