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Vorticity plots for the stroke 1 (τa = τd = 0.5 and α=40) at the three different span locations (A=25%; B=50%; and C=75%) of the wing at different non dimensional time. As the wing decelerates ( =4.41 to = 4.91), it is seen that new positive and negative vorticity layers are formed on the upper and lower surfaces of the wing under the previously existing vorticity layers. These new vorticity layers are opposite to that of the acceleration case; this region of newly formed vorticity in a short time explains the negative force coefficients during deceleration. For the FF case (
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An Unsteady force generation mechanisms (delayed stall, wake capture and rotational lift) during idealized hovering of insect flight at Reynolds number (Re) of 136 have been identified in this research. Dependence of flow physics on Re forms the basis of present study to observe the dependence of unsteady force generation mechanisms on Re. A system...
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A numerical investigation on propeller-induced flow effects in tractor configurations on a Zimmerman wing-fuselage using the cambered thin airfoil is presented in this paper. The Reynolds number based on the mean aerodynamic chord was 1.3 × 105. Significant aerodynamic performance benefits could be found for a propeller in the tractor configuration...
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... Even from older days, people used to imitate the things from nature. Flapping MAV is an artificial flyer made from the natural flyers [5] with maximum wing span of 15 cm. Most of the MAVs are exactly mimicking the birds or insects wing and also their flapping frequencies [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. ...
... Flapping MAV is an artificial flyer made from the natural flyers [5] with maximum wing span of 15 cm. Most of the MAVs are exactly mimicking the birds or insects wing and also their flapping frequencies [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Some research [4] shows that flapping insect's wing MAVs show better hovering performance than spinning wing MAV [6]. ...
The application of bio-mimetic in Micro Aerial Vehicles (MAV) is a developing field and has enormous applications in the aviation industry. In this work, experimental investigation of the insect like MAV having flapping wing is discussed. The iphiclus-egensis-aile flexible wing and the nearctic-ceratopogonidae flexible wing were chosen for this study. Values of the coefficient of lift for the unsteady aerodynamics were converted to normalized frequency domain using Welch power spectral density method at various flapping frequencies and Reynolds number. The wing tip vortices were captured using laser visualization technique and further the images were processed using MATLAB. Experimental investigations were carried out in wind tunnel for various velocities and Angle of Attack (AoA) and the results were obtained using digital six component balancing system. Detailed study of both the results shows that the nearctic-ceratopogonidae flexible wing has better lifting properties than the iphiclus-egensis-aile flexible wing at low flapping frequencies and low AoA. For higher flapping frequencies and high AoA, the latter shows better lifting properties than the former.
... So to overcome the limitation of the usage of a quad copter, a bio mimicked butterfly or a bee in the actual aspect ratio is developed and an analysis has been done with the bio mimicked butter fly UAV. Flapping unmanned aerial vehicle (UAV) is an artificial flyer made from the natural birds or insects [7], [10][11] with maximum span of 15 cm. Most of the UAV's are exactly mimicking the birds or insects wing and also their flapping frequencies [1], [15] Some research (Hawkes, et al. 2016) shows that flapping insects wing UAVs showing better hovering performance than spinning wing UAV. ...
... So to overcome the limitation of the usage of a quad copter, a bio mimicked butterfly or a bee in the actual aspect ratio is developed and an analysis has been done with the bio mimicked butter fly UAV. Flapping unmanned aerial vehicle (UAV) is an artificial flyer made from the natural birds or insects [7], [10][11] with maximum span of 15 cm. Most of the UAV's are exactly mimicking the birds or insects wing and also their flapping frequencies [1], [15] Some research (Hawkes, et al. 2016) shows that flapping insects wing UAVs showing better hovering performance than spinning wing UAV. ...
In the Sri Lankan territory, the Asiatic elephants (Elephas maximus maximus) are at the verge of extinction. The main reason for this extinction is due to the illegal killing for their tusks and the loss of habitat. The solutions for these are the proper monitoring of the habitats in the thick forests where one cannot reach easily and interrogate it. Through this paper, it is attempted to mimic nature in terms of the insect's flight and try to suggest and compare the performance of artificial flying butterfly for Elephant habitat monitoring. The lift and thrust of these artificial butterflies has been studied under various wind velocities in the Sri Lankan and Indian region. The model has been analysed under the different angle of attacks, flapping frequencies and wind velocities in a subsonic wind tunnel and compared with existing fixed unmanned aerial vehicle (UAV). For higher lift and for better thrust performance artificial butterflies is more efficient than other unmanned aerial vehicles.
... The lifting force produced by insect membranous wings is about ten times higher than that of airfoil with the same area. Insects are magnificent in flight, and the flying behaviours include flapping flight, glide, hover, changing flying directions rapidly, and flight backward [3]. ...
The structures combining the veins and membranes of membranous wings of the Chinese bee Apis cerana cerana Fabricius into a whole have excellent load-resisting capacity. The membranous wings of Chinese bees were taken as research objects and the mechanical properties of a biomimetic model of membranous wings as targets. In order to understand and learn from the biosystem and then make technical innovation, the membranous wings of Chinese bees were simulated and analysed with reverse engineering and finite element method. The deformations and stress states of the finite element model of membranous wings were researched under the concentrated force, uniform load, and torque. It was found that the whole model deforms evenly and there are no unusual deformations arising. The displacements and deformations are small and transform uniformly. It was indicated that the veins and membranes combine well into a whole to transmit loads effectively, which illustrates the membranous wings of Chinese bees having excellent integral mechanical behaviour and structure stiffness. The realization of structure models of the membranous wings of Chinese bees and analysis of the relativity of structures and performances or functions will provide an inspiration for designing biomimetic thin-film materials with superior load-bearing capacity.
