Article
Engineering, Aerospace
Goktug Kocak, Mehmet Metin Yavuz
Summary: In this study, the influence of ground effect on the aerodynamics and stability of a non-slender delta wing with a sweep angle of 45 degrees was investigated. The results showed that the ground effect had a significant impact on the aerodynamic performance and stability of the wing, with an increase in drag and lift forces as the wing height decreased. The pressure measurements revealed complex effects on vortex reattachment and strength.
AEROSPACE SCIENCE AND TECHNOLOGY
(2022)
Article
Mechanics
Chenguang Lai, Liangkui Tan, Yujie Zhu, Shengji Zhu, Shigeru Obayashi
Summary: This study numerically examines the aeroacoustic characteristics of a multi-directional wing under the wing-in-ground effect. The results show that different intensities of the wing-in-ground effect led to remarkable differences in the characteristic frequency of aerodynamic noise induced by the multi-directional wing.
Article
Mechanics
Baptiste Corban, Michael Bauerheim, Thierry Jardin
Summary: This paper presents the discovery of optimal flapping wing kinematics using a deep learning surrogate model. The model is trained on a dataset of randomly generated kinematics and can quickly predict the forces experienced by the wing. Multi-objective optimization is then performed to obtain new kinematics. The results reveal two distinct families of motions promoting high efficiency and high lift.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Engineering, Aerospace
Jonathan Hilger, Markus Raimund Ritter
Summary: The Pazy wing aeroelastic benchmark is a highly flexible wind tunnel model. Static coupling simulations and stability analyses for selected flow velocities and angles of attack were presented, showing a significant change in flutter stability with increasing deflection and influence of modal properties.
Article
Engineering, Aerospace
Pedro J. Boschetti, Carlos A. Neves, Pedro J. Gonzalez
Summary: This paper focuses on the development of a model that represents the longitudinal aerodynamics of a wing and/or flight vehicle in ground effect, particularly at high angles of attack. The model is able to accurately simulate the unsteady aerodynamic phenomena in ground effect at high angles of attack. Experimental data from wind-tunnel measurements have been used to validate the model and a good agreement has been achieved. The model is capable of adjusting the aerodynamic coefficients during maneuvers in dynamic ground effect.
JOURNAL OF AIRCRAFT
(2022)
Review
Engineering, Aerospace
H. Joshi, P. Thomas
Summary: This paper reviews the use of the vortex lattice method (VLM) in modeling the general aerodynamics of subsonic and supersonic aircraft. The historical overview shows the extensive use of this method for over a century for the analysis of different aircraft characteristics. The efficiency and cost-effectiveness of VLM make it a preferred means for solving computational design parameters in less time.
AERONAUTICAL JOURNAL
(2023)
Article
Engineering, Ocean
Ying Xue, Chen -Jun Yang, Xiao-Qian Dong, Wei Li, Francis Noblesse
Summary: A lifting-surface design method for marine propellers is proposed using genetic algorithms and a back-propagation neural network. The method optimizes the geometry and pitch distribution of the propeller to best fit a prescribed circulation distribution. The effectiveness and accuracy of the method are confirmed through numerical tests and viscous-flow simulations.
APPLIED OCEAN RESEARCH
(2022)
Article
Robotics
Cristina Ruiz, Jose Angel Acosta, Anibal Ollero
Summary: Flapping wing robots are potentially safe and efficient platforms for near-human operations, and their automation needs to be accompanied by increased payload capacity. This study presents a new passive morphing wing prototype for enhancing the payload of such UAVs. The prototype utilizes a biased elastic joint and includes modeling, simulation, and optimization schemes for customization to different flapping wing robots. Flight experiments validate the model and demonstrate a lift increase of up to 16% and an estimated consumption reduction of 10% for the morphing prototype.
IEEE ROBOTICS AND AUTOMATION LETTERS
(2023)
Article
Engineering, Multidisciplinary
Alexander Gehrke, Karen Mulleners
Summary: The study experimentally optimized the pitch angle kinematics of a flapping wing system to maximize lift and hovering efficiency. Different pitch angle profiles were found to impact the vortical flow structures and aerodynamic performance in flapping wing flight.
BIOINSPIRATION & BIOMIMETICS
(2021)
Article
Engineering, Aerospace
Caleb Robb, Ryan Paul
Summary: This paper presents an aerodynamic modeling of a flying wing with Ludwig Prandtl's bell spanload. The models are developed using a vortex-lattice method and a Reynolds-Averaged Navier-Stokes computational fluid dynamics solution. Both methods show excellent agreement in predicting spanwise aerodynamic forces and stability/control derivatives dominated by lift and moment contributions. The analysis also observes the phenomenon of proverse yaw and predicts similar off-axis control power.
Article
Mechanics
Kittinan Wansasueb, Natee Panagant, Sujin Bureerat, Numchoak Sabangban, Nantiwat Pholdee
Summary: In this study, a transonic aeroelastic optimization approach for composite wing structure is proposed. The aerodynamic influence coefficient matrices are generated using the doublet lattice method and corrected by high fidelity computational fluid dynamic analysis. A multiobjective transonic aeroelastic optimization problem is developed with mass and critical speed as objective functions and structural and aeroelastic limits as design constraints. A comparative study of eight state-of-the-art algorithms is performed, and additional results of 21 mechanical optimization problems are evaluated. The Multiobjective Manta Ray Foraging Optimizer is found to be the best algorithm in terms of aeroelastic optimization and the second best in mechanical problems.
Article
Engineering, Aerospace
Rogerio Rodrigues dos Santos, Tulio Gomes de Paula Machado, Saullo Giovani Pereira Castro
Summary: This study proposes a workflow for optimal design of laminated composite stiffened panels using design of experiments, metamodeling, and optimization phases, with machine learning strategy and multi-objective formulation. The deterministic algorithm choice accelerates convergence towards optimal design, achieving a balance between exploring new design regions and refining optimal design. Numerical experiments demonstrate the viability of the proposed methodology for a representative upper skin wing panel design.
Article
Engineering, Aerospace
Zhigang Wang, Qi Wu, Yifei Lu, Panpan Bao, Yu Yang, Daochun Li, Xiasheng Sun, Jinwu Xiang
Summary: This paper proposes a distributed morphing lattice structure based on variable geometry digital metamaterials, which enables distributed morphing ability and improves the performance of aircraft. By optimizing the combination sequence of the lattice structure and the input of actuators, the outer surface can morph into the desired aerodynamic contour.
Article
Engineering, Aerospace
Natsuki Tsushima, Masato Tamayama, Hitoshi Arizono, Kanjuro Makihara
Summary: This paper evaluates the manufacturing accuracy and aeroelastic characteristics of an additively manufactured wing model, demonstrating its feasibility for wind tunnel tests. Additionally, a geometrically nonlinear aeroelastic analysis model is validated for static calculations by comparing with results of the wind tunnel test.
AEROSPACE SCIENCE AND TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Josep M. Duro, Josep M. Bergada
Summary: This paper analyzes the evolution and effects of vortices under airplane wings using complex potential equations and Bernoulli potential equations, with the goal of optimizing aircraft landing and takeoff times. The study shows that measuring and calculating vortex behavior can increase airport throughput by saving time between airplanes.
APPLIED SCIENCES-BASEL
(2021)
