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Effect of wing morphing on stability and energy harvesting in albatross dynamic soaring

Chinese Journal of Aeronautics 2024年第11期37卷 317-334页

作者： Wei WANG Weigang AN Bifeng SONG School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072China National Key Laboratory of Aircraft Configuration Design Xi’an 710072China

Dynamic soaring,which harvests energy from the wind,can enhance Unmanned Aerial Vehicles'(UAVs')range and ***,energy harvesting efficiency issues hinder UAV applications,which can be addressed by wing ***,this study investigates the influence of albatross wing morphing during dynamic *** constructing a parametric model,the shape of the albatross wing can be modeled and achieve morphing based on *** the video data,this paper summarizes the typical wing morphing patterns of the albatross and notices that changes primarily occur during the leeward descent *** paper first analyzes the aerodynamic performance of different wing morphing patterns and finds that the drag coefficient can be reduced by 7.75%with a suitable morphing *** paper also explores the drag coefficient reduction mechanism and finds that downwash airflow decreases by 30.32%after wingtip ***,the lift-to-drag ratio shows minimal variation under different morphing patterns,within 2%.From the stability perspective,this study finds that the neutral point position changes after *** maximum longitudinal static margin change is 4.9%,enhancing longitudinal stability by increasing the restorative moment *** lateral neutral point is 4.87%closer to the center of gravity,decreasing the roll and yaw *** can be observed that wingtip anhedral significantly increases the stability of the ***,a flight simulation is carried out to study the morphing influence on trajectory and energy *** results show that maximum energy gained is improved by 47.99%,and endurance is increased by 13.05%.The results also indicate that the effects of wing morphing are global rather than limited to the phase of morphing ***,based on the results,this paper proposes wing morphing regularity about the wingtip for *** bends downward can significantly increase the UAVs'stability and reduce drag,but the

关键词： Dynamic soaring wing morphing Aerodynamics Stability Energy harvesting

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Role of wing morphing in thrust generation

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Theoretical & Applied Mechanics Letters 2014年第3期4卷 35-41页

作者： Mehdi Ghommem Muhammad R. Hajj Philip S. Beran Ishwar K. Puri Center for Numerical Porous Media (NumPor) King Abdullah University of Science and Technology Thuwal 23955-6900 Kingdom of Saudi Arabia Department of Engineering Science and Mechanics Virginia Tech BlacksburgVirginia 24061 USA Air Force Research Laboratory Wright-Patterson AFB Ohio 45433-7542 USA Department of Mechanical Engineering McMaster University HamiltonOntario L8S 4L7 Canada

In this paper, we investigate the role of morphing on flight dynamics of two birds by simulating the flow over rigid and morphing wings that have the characteristics of two different birds, namely the Giant Petrel and Dove Prion. The simulation of a flapping rigid wing shows that the root of the wing should be placed at a specific angle of attack in order to generate enough lift to balance the weight of the bird. However, in this case the generated thrust is either very small, or even negative, depending on the wing shape. Further, results show that morphing of the wing enables a significant increase in the thrust and propulsive efficiency. This indicates that the birds actually utilize some sort of active wing twisting and bending to produce enough thrust. This study should facilitate better guidance for the design of flapping air vehicles.

关键词： bird flight thrust generation wing morphing

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Quantitative analysis of the morphing wing mechanism of raptors:morphing kinematics of Falco peregrinus wing

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Chinese Physics B 2023年第4期32卷 68-77页

作者：唐迪车婧琦金伟杰崔亚辉范忠勇杨茵刘大伟 College of Mechanical Engineering Zhejiang University of TechnologyHangzhou 310014China Affiliated HangZhou XiXi Hospital Zhejiang University School of MedicineHangzhou 310023China Zhejiang Museum of Natural History Hangzhou 310014China High Speed Aerodynamic Institute China Aerodynamics Research and Development CenterMianyang 621000China

Raptors are getting more attention from researchers because of their excellent flight *** the excellent wing morphing ability is critical for raptors to achieve high maneuvering flight,which can be a good bionic inspiration for unmanned aerial vehicles(UAV)***,morphing wing motions of Falco peregrinus with multi postures cannot be consulted since such a motion database was *** study aimed to provide data reference for future research in wing morphing *** used the computed tomography(CT)approach to obtain nine critical postures of the Falco peregrinus wing skeleton,followed with motion analysis of each joint and *** on the obtained motion database,a six-bar kinematic model was proposed to regenerate wing motions with a high fidelity.

关键词： raptor wing morphing skeletal mechanism CT scans six-bar model

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Piezoelectric energy harvesting from morphing wing motions for micro air vehicles

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Theoretical & Applied Mechanics Letters 2013年第5期3卷 69-72页

作者： Abdessattar Abdelkefi Mehdi Ghommem Department of Engineering Science and Mechanics Virginia TechBlacksburg Virginia 24061 USA Center for Numerical Porous Media (NumPor) King Abdullah University of Science and TechnologyThuwal 23955-6900 Kingdom of Saudi Arabia

wing flapping and morphing can be very beneficial to managing the weight of micro air vehicles through coupling the aerodynamic forces with stability and control. In this letter, harvesting energy from the wing morphing is studied to power cameras, sensors, or communication devices of micro air vehicles and to aid in the management of their power. The aerodynamic loads on flapping wings are simulated using a three-dimensional unsteady vortex lattice method. Active wing shape morphing is considered to enhance the performance of the flapping motion. A gradient-based optimization algorithm is used to pinpoint the optimal kinematics maximizing the propellent efficiency. To benefit from the wing deformation, we place piezoelectric layers near the wing roots. Gauss law is used to estimate the electrical harvested power. We demonstrate that enough power can be generated to operate a camera. Numerical analysis shows the feasibility of exploiting wing morphing to harvest energy and improving the design and performance of micro air vehicles.

关键词： energy harvesting piezoelectric material micro air vehicles wing morphing

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