Bioinspiration of the vein structure of dragonfly wings on its flight characteristics

2021 ◽  
Author(s):  
Chao Liu ◽  
Ruijuan Du ◽  
Fadong Li ◽  
Jiyu Sun
Keyword(s):  
Dragonfly Wings

scholarly journals Numerical Investigation on Flapping Aerodynamic Performance of Dragonfly Wings in Crosswind

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Chao Wang ◽  
Rui Zhang ◽  
Chaoying Zhou ◽  
Zhenzhong Sun
Keyword(s):  
Stokes Equations ◽  
Three Dimensional ◽  
Lateral Force ◽  
Aerodynamic Characteristics ◽  
Navier Stokes ◽  
Aerodynamic Forces ◽  
Sideslip Angle ◽  
Flight Direction ◽  
Time Average ◽  
Dragonfly Wings

Numerical simulations are performed to investigate the influence of crosswind on the aerodynamic characteristics of rigid dragonfly-like flapping wings through the solution of the three-dimensional unsteady Navier-Stokes equations. The aerodynamic forces, the moments, and the flow structures of four dragonfly wings are examined when the sideslip angle ϑ between the crosswind and the flight direction varied from 0o to 90o. The stability of the dragonfly model in crosswind is analyzed. The results show that the sideslip angle ϑ has a little effect on the total time-average lift force but significant influence on the total time-average thrust force, lateral force, and three-direction torques. An increase in the sideslip angle gives rise to a larger total time-average lateral force and yaw moment. These may accelerate the lateral skewing of the dragonfly, and the increased rolling and pitching moments will further aggravate the instability of the dragonfly model. The vorticities and reattached flow on the wings move laterally to one side due to the crosswind, and the pressure on wing surfaces is no longer symmetrical and hence, the balance between the aerodynamic forces of the wings on two sides is broken. The effects of the sideslip angle ϑ on each dragonfly wing are different, e.g., ϑ has a greater effect on the aerodynamic forces of the hind wings than those of the fore wings. When sensing a crosswind, it is optimal to control the two hind wings of the bionic dragonfly-like micro aerial vehicles.

Spectroscopic characterization of dragonfly wings common in Japan

2012 ◽  
Vol 61 ◽  
pp. 85-93 ◽  
Author(s):  
Akira Yoshihara ◽  
Atsushi Miyazaki ◽  
Toshiteru Maeda ◽  
Yoshika Imai ◽  
Takashi Itoh
Keyword(s):  
Spectroscopic Characterization ◽  
Dragonfly Wings

Arnold circulation and multi-optimal dynamic controlling mechanisms in dragonfly wings

2013 ◽  
Vol 26 (3) ◽  
pp. 237-244 ◽  
Author(s):  
Hongxiao Zhao ◽  
Yajun Yin ◽  
Zheng Zhong
Keyword(s):  
Optimal Dynamic ◽  
Dragonfly Wings

J025021 Proposal of Stiffiness Approximaton Method of Dragonfly Wings in Flapping Flight Analysis

2013 ◽  
Vol 2013 (0) ◽  
pp. _J025021-1-_J025021-2
Author(s):  
Akihisa SUGAHARA ◽  
Itsuro HONDA ◽  
Osamu KAWANAMI
Keyword(s):  
Flapping Flight ◽  
Dragonfly Wings

BIOMIMETIC STRUCTURE DESIGN OF DRAGONFLY WING VENATION USING TOPOLOGY OPTIMIZATION METHOD

2014 ◽  
Vol 14 (04) ◽  
pp. 1450078 ◽  
Author(s):  
JIYU SUN ◽  
MINGZE LING ◽  
CHUNXIANG PAN ◽  
DONGHUI CHEN ◽  
JIN TONG ◽  
...  
Keyword(s):  
Topology Optimization ◽  
Optimization Method ◽  
Structure Design ◽  
Staggered Grid ◽  
Wing Venation ◽  
Quantitative Models ◽  
Dragonfly Wing ◽  
Wing Motion ◽  
Dragonfly Wings ◽  
Topology Optimization Method

Scientists have carried out research for various biomimetic applications based on the dragonfly wings because of the superb flying skills and lightsome posture. The wings of dragonflies are mainly composed of veins and membranes, which give rise to the special characteristics of their wings that make dragonflies being supremely versatile, maneuverable fliers. Mimicking the dragonfly wing motion is of great technological interest from application's point of view. However, the major challenge is the biomimetic fabrication to replicate the wing motion due to the very complex nature of the wing venation of dragonfly wings. In this regard, the topology optimization method (TOM) is useful to simplify object's structure while retaining its mechanical properties. In this paper, TOM is employed to simplify and optimize the venation structure of dragonfly (Pantala flavescens Fabricius) wing that is captured by a 3D scanner and numerical reconfiguration. Combined with the material parameters obtained from nanoindentation testing, the quantitative models are established based on a finite element (FE) analysis and discussed in static range. The quantitative models are then compared with the square frame, staggered grid frame and hexagonal frame to examine the potentials of the biomimetic structure design for the fabrication of greenhouse roof.

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