Optimization of Flexible Flapping-Wing Kinematics in Hover

Gogulapati, Abhijit; Friedmann, Peretz P.; Martins, Joaquim R. R. A.

doi:10.2514/1.j053083

Cited by 15 publications

(4 citation statements)

References 34 publications

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“…The results, supported partly by an experiment, revealed that the best overall aerodynamic performance was achieved with a highly flexible wing. A surrogate-based approach was used in [28] for numerical optimization of structural sizing of a flapping wing. The authors of this study conclude that while flexible configurations produced higher thrust, rigid configurations were more efficient.…”

Section: Introductionmentioning

confidence: 99%

Experimental optimization of wing shape for a hummingbird-like flapping wing micro air vehicle

et al. 2017

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Flapping wing micro air vehicles (MAVs) take inspiration from natural fliers, such as insects and hummingbirds. Existing designs manage to mimic the wing motion of natural fliers to a certain extent; nevertheless, differences will always exist due to completely different building blocks of biological and man-made systems. The same holds true for the design of the wings themselves, as biological and engineering materials differ significantly. This paper presents results of experimental optimization of wing shape of a flexible wing for a hummingbird-sized flapping wing MAV. During the experiments we varied the wing 'slackness' (defined by a camber angle), the wing shape (determined by the aspect and taper ratios) and the surface area. Apart from the generated lift, we also evaluated the overall power efficiency of the flapping wing MAV achieved with the various wing design. The results indicate that especially the camber angle and aspect ratio have a critical impact on the force production and efficiency. The best performance was obtained with a wing of trapezoidal shape with a straight leading edge and an aspect ratio of 9.3, both parameters being very similar to a typical hummingbird wing. Finally, the wing performance was demonstrated by a lift-off of a 17.2 g flapping wing robot.

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Section: Introductionmentioning

confidence: 99%

Experimental optimization of wing shape for a hummingbird-like flapping wing micro air vehicle

et al. 2017

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“…In the design process, the motion asymmetry is reduced by optimizing the mechanism. The stability of flapping wing flight is improved, and the transmission efficiency is guaranteed [44][45][46][47].…”

Section: The Configuration Designmentioning

confidence: 99%

Design optimization and experimental study of a novel mechanism for a hover-able bionic flapping-wing micro air vehicle

et al. 2020

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Allomyrina dichotoma has a natural ultra-high flying ability and maneuverability. Especially its ability to fly flexibly in the air, makes it more adaptable to the harsh ecological environment. In this study, a bionic flapping-wing micro air vehicle (FMAV) is designed and fabricated by mimicking the flight mode of A. dichotoma. Parametric design was employed for combining the airframe structure and flight characteristics analysis. To improve the transmission efficiency and compactness of the FMAV mechanisms, this study first analyses the body structure of A. dichotoma, and then proposes a novel mechanism of FMAV based on its biological motion characteristics, the flight motion characteristics, and its musculoskeletal system. By optimizing the flapping-wing mechanism and mimicking the flying mechanism of A. dichotoma, the large angle amplitude and the high-frequency flapping motion can be achieved to generate more aerodynamic force. Meanwhile, to improve the bionic effect and the wing performance of FMAV, the flexible deformation of A. dichotoma wings for each flapping period was observed by a high-speed camera. Furthermore, the bionic design of wings the prototype was carried out, therefore the wings can generate a high lift force in the flapping process. The experiment demonstrated that the aircraft can achieve a flapping angle of 160 degrees and 30 Hz flapping frequency. The attitude change of FMAV is realized by mimicking the movement for the change of attitude of the A. dichotoma, by changing the angle of attack of the wing, and executing the flight action of multiple degrees of freedom including pitch, roll and yaw. Finally, the aerodynamic experiment demonstrated that the prototype can offer 27.8 g lift and enough torque for altitude adjustment.

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“…Here, in order to additionally consider the effect of time scale of wing stroke reversal and wing pitch reversal on optimization including WKP, we adopt the wing kinematic pattern of Berman and Wang [8], but overlook the effect of stroke plane deviation angle on optimization because of its low amptitude [12,21].…”

Section: Wing Kinematicsmentioning

confidence: 99%

Wing Geometry and Kinematic Parameters Optimization of Flapping Wing Hovering Flight

Zhang

2016

Applied Sciences

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How to efficiently mimic the wing shape and kinematics pattern of an able hovering living flier is always a concern of researchers from the flapping wing micro aerial vehicles community. In this work, the separate or combined optimizations of wing geometry or/and wing kinematic parameters are systematically performed to minimize the energy of hovering flight, firstly on the basis of analytically extended quasi-steady aerodynamic model by using hybrid genetic algorithm. Before the elaboration of the optimization problem, the parametrization description of dynamically scaled wing with non-dimensional conformal feature of insect-scale rigid wing is firstly proposed. The optimization results show that the combined optimization of wing geometry and kinematic parameters can obtain lower flapping frequency, larger wing geometry parameters and lower power density in comparison with those from other cases of optimization. Moreover, the flapping angle for the optimization involving wing kinematic parameters manifests harmonic shape profile and the pitch angle possesses round trapezoidal profile with certain faster time scale of pitch reversal. The combined optimization framework provides a novel method for the conceptual design of fundamental parameters of biomimetic flapping wing micro aerial vehicle.

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Optimization of Flexible Flapping-Wing Kinematics in Hover

Cited by 15 publications

References 34 publications

Experimental optimization of wing shape for a hummingbird-like flapping wing micro air vehicle

Experimental optimization of wing shape for a hummingbird-like flapping wing micro air vehicle

Design optimization and experimental study of a novel mechanism for a hover-able bionic flapping-wing micro air vehicle

Wing Geometry and Kinematic Parameters Optimization of Flapping Wing Hovering Flight

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