Experimental and analytical analysis of aerodynamic lift of an ornithopter at low and high angles of attack

Bakhtiari, Abdolbaghi; Haghighi, Shahram Ehtemadi; Maghsoudpour, Adel

doi:10.1177/0954410018771175

Cited by 4 publications

(3 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The starting point of deflection is approximately 41% of the wing's semi-span. Moreover, as Kim and Han 33 and Bakhtiari et al 41 stated, twisting will automatically be generated with a suitably designed flexible wing. Designing the airfoil wing is performed by getting inspired from the wing shape of the large size flying animals.…”

Section: Methodsmentioning

confidence: 99%

The role of wing bending deflection in the aerodynamics of flapping micro aerial vehicles in hovering flight

Feshalami

Djavareshkian

Zaree

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part G:

View full text Add to dashboard Cite

Scientists have been improving the aerodynamic performance of flapping micro aerial vehicles by drawing inspiration from birds and insect flight. In this research study, first, the flapping mechanism of the black-headed gull is designed and then it is constructed in order to investigate the effects of wing bending deflection on the aerodynamic performance. Thrust generation, power consumption and power loading are considered as performance parameters. Three wings representing different underlying structures, namely flexible membrane, rigid membrane and airfoil, are fabricated with the same planform to investigate the roles of flexibility, thickness and camber. Experiments are performed for flapping frequencies ranging from 1.5 Hz to 6 Hz, 10 degrees angle of attack and no wind tunnel velocity (hovering flight). The results indicate that the aerodynamic performance is improved by using the bending deflection mechanism in comparison with the simple flapping mechanism. Moreover, we can conclude that the performance of the airfoil wing is superior to flexible and rigid wings.

show abstract

Section: Methodsmentioning

confidence: 99%

The role of wing bending deflection in the aerodynamics of flapping micro aerial vehicles in hovering flight

Feshalami

Djavareshkian

Zaree

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part G:

View full text Add to dashboard Cite

show abstract

“…Therefore, this study only examines the effects of bending deflection on aerodynamic performance. However, as Kim and Han, 31 and Bakhtiari et al 41 showed, the twisting motion will automatically be generated with a suitably designed flexible wing. The flexibility of the wing is defined by Young's modulus.…”

Section: Experimental Setup Introduction Of the Mechanismmentioning

confidence: 99%

Experimental investigation of flapping mechanism of the black-headed gull in forward flight

Feshalami

Djavareshkian

Yousefi

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part G:

View full text Add to dashboard Cite

Many developments in aerospace science have originated from nature. One of these developments has been obtained through inspirations from flying locomotion. The aim of this study is to simulate the flapping mechanism of the black-headed gull in forward flight. The wing of the black-headed gull is characterized entirely by complex dihedral, dividing the wing into two distinct parts. Hence, a flapping mechanism with different bending deflection angles is constructed and compared with a primitive flapping mechanism. Firstly, parametric studies are conducted to assess the role of flapping frequency, velocity and bending deflection angle on the lift, thrust and power loading of the membrane flexible wing at 10 ° angle of attack. Secondly, dimensional analysis is used to establish the similarity between the real gull and the constructed mechanism. Superiority of the bending deflection mechanism is concluded in forward flight against simple flapping wing in terms of aerodynamic forces as well as power loading parameter. It is found that although the aerodynamic coefficients decrease with increase in advance ratio, the best power loading of the black-headed gull is obtained between advance ratio of 2 and 3, in the gull's aerodynamically quasi-steady regime.

show abstract

“…1 Due to importance and inherent complexities associated with FAVs, there are some researches focused on its aerodynamic aspects. [2][3][4][5][6][7][8][9][10][11][12] On the other hand, flexibility is another significant issue with FAVs that can [13][14][15][16][17][18] potentially affect their aerodynamic loadings for sustained flights.…”

Section: Introductionmentioning

confidence: 99%

A modified unsteady-nonlinear aeroelastic model for flapping wings

Pourtakdoust

Zare

Bighashdel

2022

Proceedings of the Institution of Mechanical Engineers, Part G:

View full text Add to dashboard Cite

A novel integrated aeroelastic model of flapping wings (FWs) undergoing a prescribed rigid body motion is presented. In this respect, the FW nonlinear structural dynamics is enhanced via a newly proposed modification of implicit condensation and expansion (MICE) method that better considers the structural nonlinear effects. In addition, the unsteady aerodynamic model is also an extension of the widely utilized modified strip theory (MST) in which the flexibility effects are accounted for (MST-Flex). The integrated utility of the proposed generalized MICE and MST-Flex is demonstrated to be more realistic for elastic FW flight simulation applications. The prescribed rigid body motion is produced via a servo motor whose dynamics is also considered for the analysis. A special case study is also performed whose combined aeroelastic solution is determined and validated under a sinusoidal flapping motion. To this end, an experimental setup is designed and tested in order to validate the proposed integrated approach for aeroelastic modeling of FWs. There is very good agreement between the numerical and experimental results for elastic FW aerodynamics. It should be noted that the proposed integrated aeroelastic approach is readily adaptable to all kinds of elastic wings with arbitrary geometry and various combination of structural elements.

show abstract

Experimental and analytical analysis of aerodynamic lift of an ornithopter at low and high angles of attack

Cited by 4 publications

References 17 publications

The role of wing bending deflection in the aerodynamics of flapping micro aerial vehicles in hovering flight

The role of wing bending deflection in the aerodynamics of flapping micro aerial vehicles in hovering flight

Experimental investigation of flapping mechanism of the black-headed gull in forward flight

A modified unsteady-nonlinear aeroelastic model for flapping wings

Contact Info

Product

Resources

About