Article
Biotechnology & Applied Microbiology
Erfan Salami, Elham Montazer, Thomas A. Ward, Nik Nazri Nik Ghazali, Irfan Anjum Badruddin
Summary: A novel tandem flapping wing mechanism is proposed in this study for the design of biomimetic micro air vehicles. Through optimization and spatial network analysis, the designed structure exhibits good aerodynamic performance and consistency.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2022)
Article
Engineering, Aerospace
Khanh Nguyen, Loan Thi Kim Au, Hoang-Vu Phan, Soo Hyung Park, Hoon Cheol Park
Summary: This study investigates the effects of wing kinematics, corrugation structures, and clap-and-fling on the aerodynamic efficiency of a flapping-wing micro air vehicle. It is found that modified wing kinematics version 3 improved the lift-to-drag ratio by 24%, and distributed wing corrugations slightly augmented the L/D by 2%. Clap-and-fling behavior, however, contributed to a 5% increase in lift but a 9% increase in drag, leading to a 4% reduction in L/D.
AEROSPACE SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Aerospace
Jianghao Wu, He Yan, Chao Zhou, Yanlai Zhang
Summary: The study found that in forward flight, a flapping rotary wing demonstrates reduced thrust and lift as well as enhanced rotational moment, mainly due to changes in aerodynamics on the retreating side. Factors such as a larger advance ratio and severe forward tilt of the rotational plane are disadvantageous for thrust production, but beneficial for enhancing the rotational moment.
AEROSPACE SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Multidisciplinary
Xin Fang, Jianghao Wu, Feng Du
Summary: This study establishes an elastodynamic model for flapping-wing MAV, investigates the effect of elastic deformation of the transmission mechanism on flapping motion, and derives an analytical formula for the relationship between transmission mechanism deformation and flapping angle based on kineto-elastostatic analysis.
BIOINSPIRATION & BIOMIMETICS
(2021)
Article
Engineering, Aerospace
Shengjie Xiao, Yuhong Sun, Dapeng Ren, Kai Hu, Huichao Deng, Yun Wang, Xilun Ding
Summary: This paper presents a bio-inspired flapping-wing micro air vehicle with a cross-tail wing for attitude adjustment. The novel flapping mechanism and optimized wings generate high aerodynamic force and torque, resulting in improved maneuverability. The flight tests demonstrate the excellent handling and payload capability of the vehicle, as well as the effectiveness of the attitude control method.
Review
Engineering, Aerospace
Jae-Hung Han, Yu-Jeong Han, Hyeon-Ho Yang, Sang-Gil Lee, Eun-Hyuck Lee
Summary: This study focuses on the flapping mechanisms used in biometric flapping-wing air vehicles (FWAVs). The flight characteristics of birds and bats are used as inspiration for the development of FWAVs, which offer advantages such as maneuverability and excellent flight efficiency. The study classifies and analyzes different flapping mechanisms based on wing motion and discusses strategies for improving aerodynamic performance. It also identifies research gaps and proposes future directions for further investigation. This review serves as a valuable guide for the early development stage of FWAVs.
Article
Engineering, Aerospace
Sang-Gil Lee, Hyeon-Ho Yang, Reynolds Addo-Akoto, Jae-Hung Han
Summary: Flapping-wing micro air vehicles (FWMAVs) have various flight modes similar to birds and insects, which can be studied through trajectory optimization. This paper proposes a framework including a high-fidelity simulation model to consider the complex dynamics of FWMAVs and models unsteady aerodynamics with UPM and UVLM. The optimization results show that FWMAVs use pitch-up maneuver to increase altitude during transition flight.
Article
Engineering, Aerospace
Muhammad Yousaf Bhatti, Sang-Gil Lee, Jae-Hung Han
Summary: This paper presents an approach to analyze dynamic stability and develop trajectory-tracking controllers for flapping-wing micro air vehicles (FWMAV). A multibody dynamics simulation framework coupled with a modified quasi-steady aerodynamic model was used for stability analysis and gain matrices were obtained for different flight speeds using the linear-quadratic regulator technique. The controllers were successfully implemented for trajectory tracking with smooth control parameter updates to avoid discontinuities.
Article
Automation & Control Systems
Zunyao Yang, Zhongsheng Hou, Shangtai Jin
Summary: This paper proposes two robust model-free adaptive control methods to suppress wind disturbances for a nonlinear flapping wing micro air vehicle. By developing disturbance-related dynamic linearization technique and conducting stability analysis, the effectiveness of these methods is demonstrated.
INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL
(2023)
Article
Automation & Control Systems
Si Chen, Le Wang, Yuanyuan He, Mingbo Tong, Yingjun Pan, Bing Ji, Shijun Guo
Summary: This article presents an experimental study on the performance of a flapping wing rotor (FWR) and the enhancement achieved through passive pitching angle variation (PPAV) combined with powered flapping motion. The study shows that PPAV can significantly increase the lift and efficiency of the FWR, with lift improvement of over 100% compared to the baseline model. The mechanism of PPAV offers a feasible solution for improving the aerodynamics of bioinspired FWR and has potential applications in micro air vehicles.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Engineering, Aerospace
Shao Haoyuan, Li Daochun, Kan Zi, Li Huadong, Yuan Dian, Xiang Jinwu
Summary: This study conducted numerical simulations to analyze the influence of different heights and positions of maximum camber on the lift generated by a three-wing FWR. The results indicate that camber has a significant impact on lift, and the lift is maximized when the maximum camber is close to the center position of the mean aerodynamic chord.
AEROSPACE SCIENCE AND TECHNOLOGY
(2021)
Article
Mechanics
Xinyu Lang, Bifeng Song, Wenqing Yang, Xiaojun Yang
Summary: This study numerically investigates the aerodynamic mechanism of the flapping-folding motion in bird flight. It is found that the folding motion affects the horizontal projection area of the wing and the development of the leading-edge vortex. Additionally, parameters such as folding amplitude, phase angle between flapping and folding, and mean folding angle also influence the aerodynamic characteristics.
Article
Engineering, Aerospace
Khanh Nguyen, Loan Thi Kim Au, Hoang-Vu Phan, Hoon Cheol Park
Summary: This paper compares the characteristics of hovering stability for two insect-inspired flapping-wing micro air vehicles (FW-MAVs) with different control mechanisms, and finds that the Stroke-Plane-Change (SPC) mechanism stabilizes faster and responds quicker than the Trailing-Edge-Change (TEC) mechanism, offering more agility for operation in cluttered environments.
AEROSPACE SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Aerospace
Loan Thi Kim Au, Hoon Cheol Park, Seok Tae Lee, Sung Kyung Hong
Summary: The aerodynamic performance of the clap-and-fling mechanism in the KU-Beetle micro air vehicle was investigated, showing that it enhances lift and reduces lift-to-power ratio. The contributions of the fling phases are more significant than the clap phases.
Article
Mechanics
Saeed Karimian Aliabadi, Mohamad Reza Parsa, Majid M. Moghadam
Summary: A typical flapping-wing air vehicle is fabricated and tested in a wind tunnel to investigate the impact of kinematic parameters on aerodynamic forces and moments. The hover and landing performance of birds is evaluated considering moderate and high incidence angles. Experimental parameter study reveals that increasing the angle of attack leads to higher lift and reduces axial force during perching. The force hysteresis study indicates that higher flapping frequency and angular velocity can cause dynamic instability.