Numerical Aerodynamic Characteristics of Flapping Wings

Zakaria, Mohamed Y.; Elshabka, Ahmed; Bayoumy, A. M.; Elhamid, O. E. Abd

doi:10.21608/asat.2009.23734

Cited by 17 publications

(7 citation statements)

References 3 publications

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“…The obtained results by Zakaria et al [22], as presented in Fig. 6, show close agreement with the results obtained by Delaurier [6], Kamakoti et al [37], and Benedict [38].…”

Section: Verification and Validation Of The Aerodynamic Modelsupporting

confidence: 90%

“…The used aerodynamic model has been verified in an earlier work [22] using the results presented, and validated against the results of Kamakoti et al [37] and Benedict [38]. Here, the final results of Zakaria et al are presented [22]. The airfoil used is Liebeck LPT 110A.…”

Section: Verification and Validation Of The Aerodynamic Modelmentioning

confidence: 69%

“…Also, they noted that designing an ornithopter wing with a natural frequency close to the designed flapping frequency might be a key design problem to ensure the efficient operation of the motor. Zakaria et al [22] conducted a parametric study on the effect of reduced frequency on lift, drag, thrust, and propulsive power. They concluded that there is a specific value for the dynamic twist angle at which the thrust and propulsive efficiency are independent of the reduced frequency.…”

mentioning

confidence: 99%

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Design Optimization of Flapping Ornithopters: The Pterosaur Replica in Forward Flight

Zakaria

Taha

Hajj

2016

Journal of Aircraft

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There has been a recent interest to explore the shape and kinematics parameters of distinct pterosaurs from their fossil records. Clearly, far more evidence is needed to understand the nuances of dinosaurs flight. A multiobjective aerodynamic optimization problem of the wing kinematics and planform of a pterosaur replica ornithopter designed by Aerovironment is performed. Objective functions include minimization of the required cycle-averaged aerodynamic power and maximization of the propulsive efficiency. It is found that inclusion of the inertial power requirements is necessary for a physical and proper formulation of the optimization problem. Furthermore, the mere addition of the inertial power requirements is not enough to obtain reasonable results. Rather, one has to consider a partial (or even zero) elastic energy storage. The minimum power kinematic parameters closely match those of the previously designed pterosaur replica. Nevertheless, the obtained efficiency for such a design (minimum power) is 10%, which is considerably lower than the maximum possible efficiency for the used planform (40%). Furthermore, the optimized planform for maximum efficiency of the pterosaur yields to an increase in the propulsive efficiency by 6%.

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“…The obtained results by Zakaria et al [22], as presented in Fig. 6, show close agreement with the results obtained by Delaurier [6], Kamakoti et al [37], and Benedict [38].…”

Section: Verification and Validation Of The Aerodynamic Modelsupporting

confidence: 90%

Section: Verification and Validation Of The Aerodynamic Modelmentioning

confidence: 69%

mentioning

confidence: 99%

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Design Optimization of Flapping Ornithopters: The Pterosaur Replica in Forward Flight

Zakaria

Taha

Hajj

2016

Journal of Aircraft

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“…Other researchers developed the Delaurier model for the analysis of various wing shapes with phase lag between flapping and pitching motion in them. [6][7][8] Shyy et al 9 also studied the aerodynamics of flapping wing micro air vehicles (MAVs) with special focus on small MAVs and membrane wings. The tail also has a significant effect on the dynamics and control of the flapping wing robot in addition to that of the wings.…”

Section: Introductionmentioning

confidence: 99%

Modeling and control of a flapping wing robot

Bakhtiari

Haghighi

Maghsoudpour

2018

Proceedings of the Institution of Mechanical Engineers, Part K:

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The dynamics and control of a flapping wing robot are studied in this paper which helps to develop a complete dynamic model for the robot consisting of tail effects and also enhance the path tracking control of the robot. In the first part of the paper, the aerodynamic model of the wings is presented, and an aerodynamic force model for the tail is introduced which includes the leading edge suction effects. An experiment is also carried out on a flapping wing robot in a laboratory environment to evaluate the forces on the tail and its result will be compared with the results of the model presented for the tail. In the second part, a controller is designed for the robot. This controller uses the nonlinear dynamic inversion method to solve the nonlinear equations of the control system. The experimental results of the tail forces agree well with the theoretical predictions and reveal that the tail aerodynamics are affected by leading edge suction. Also, simulation results show that the competence performance and convergence performance of the designed controller are obtained.

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“…In addition, in forward flight analysis, strip theory has been used to model the flapping motion of flapping wings in order to measure the aerodynamic forces involved [17]. Many researchers [35][36][37][38][39][40][41] have applied strip theory to determine the performance of flapping wing drones and natural flapping fliers. None of the mentioned studies have investigated the effects of wing shape on flight performance.…”

Section: Introductionmentioning

confidence: 99%

Insights into Sensitivity of Wing Shape and Kinematic Parameters Relative to Aerodynamic Performance of Flapping Wing Nano Air Vehicles

Throneberry

Hassanalian

Abdelkefi

2019

Drones

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In this work, seven wings inspired from insects’ wings, including those inspired by the bumblebee, cicada, cranefly, fruitfly, hawkmoth, honeybee, and twisted parasite, are patterned and analyzed in FlapSim software in forward and hovering flight modes for two scenarios, namely, similar wingspan (20 cm) and wing surface (0.005 m2). Considering their similar kinematics, the time histories of the aerodynamic forces of lift, thrust, and required mechanical power of the inspired wings are calculated, shown, and compared for both scenarios. The results obtained from FlapSim show that wing shape strongly impacts the performance and aerodynamic characteristics of the chosen seven wings. To study the effects of different geometrical and physical factors including flapping frequency, elevation amplitude, pronation amplitude, stroke-plane angle, flight speed, wing material, and wingspan, several analyses are carried out on the honeybee-inspired shape, which had a 20 cm wingspan. This study can be used to evaluate the efficiency of different bio-inspired wing shapes and may provide a guideline for comparing the performance of flapping wing nano air vehicles with forward flight and hovering capabilities.

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Numerical Aerodynamic Characteristics of Flapping Wings

Cited by 17 publications

References 3 publications

Design Optimization of Flapping Ornithopters: The Pterosaur Replica in Forward Flight

Design Optimization of Flapping Ornithopters: The Pterosaur Replica in Forward Flight

Modeling and control of a flapping wing robot

Insights into Sensitivity of Wing Shape and Kinematic Parameters Relative to Aerodynamic Performance of Flapping Wing Nano Air Vehicles

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