SSHS LAB

Research

b. Experimental approach and Hardware Development of FW vehicles

Flapping Wing Air Vehicles

Research

Flapping Wing Air Vehicles

b. Experimental approach and Hardware Development of FW vehicles

Principal Investigator: Jae-Hung Han
Participating Researcher: Reynolds Addo-Akoto, Hyeon-Ho Yang, Sang-Gil Lee, Yujeong Han
Related Projects: NRF-UVARC(한국연구재단-무인이동체원천기술개발사업단)

Summary:

Bioinspired ornithopter research group in the SSHS Lab. ultimately pursues the development of agile, stable, and autonomous ornithopter platforms, motivated from the flight mechanism/control strategy of biological flyers. We are seeking efficient methodologies for modeling structural, aerodynamic, and flight dynamic characteristics of ornithopters through investigating semi-empirical flapping-wing aerodynamic model, modal-based flexible multi-body dynamics, and system identification strategy using Magnetic Suspension and Balance System (MSBS). For more detailed research activities, refer to the contents below or our multimedia channel.

Related Recent Publication:

Addo-Akoto, R., Han, J.-S., and Han, J.-H., “Roles of wing flexibility and kinematics in flapping wing aerodynamics,” Journal of Fluids and Structures, Vol. 104, 103317, July 2021.
Han, J.-S. and Han, J.-H., “A contralateral wing stabilizes a hovering hawkmoth under a lateral gust,” Scientific Reports, Vol. 9, pp. 393-406, Oct. 2019
Addo-Akoto, R., Han, J.-S. and Han, J.-H., “Influence of aspect ratio on wing–wake interaction for fapping wing in hover,” Experiments in Fluids, Vol. 60, No.11, Article ID 164, Oct. 2019.
Han, J.-S., Kim, H.-Y. and Han, J.-H., “Interactions of the wakes of two flapping wings in hover,” Physics of Fluids, Vol. 30, Issue 2, Article ID 021901, Feb. 2019.
Kim, H.-Y., Han, J.-S. and Han, J.-H., “Aerodynamic effects of deviating motion of flapping wings in hovering flight,” Bioinspiration & Biomimetics, Vol. 14, No. 2, Article ID 026006, Feb. 2019

Bioinspired Ornithopter

1.Goals

Design and build hardware prototypes of innovative ornithopters capable of flight
Effectively predict the flight dynamics of the ornithopters through flexible multi-body dynamics and flapping-wing aerodynamic modeling approaches

2. Approaches

Computer-based design approach for the SF-3 development

3. Research Achievements

SF-3 design and development

Computer-based design approach for the SF-3 development

SSHS Lab ornithopter, SF-3 simulation model and HW prototype

SSHS Lab ornithopter SF-3 HSC recording for pitch attitude tracking experiment

Wing beat frequency-dependent multiple trim conditions of the ornithopters

Inherently oscillatory flight states at trimmed flights due to the flapping motion
Multiple trim conditions with respect to the wing beat frequency (characterized as a stable limit-cycle oscillation)
Stable limit-cycle trim trajectories: recovered to trim condition after the disturbance

Experimental approach to study flight dynamics of FWMAVs

1.Goals

Experimentally study the dynamic flight characteristics of bioinspired MAVs.
Analyze the wake patterns for better understanding of various lift enhancement mechanisms

2. Approaches

Build dynamically scaled-up robotic models equip with sensors (2 and 3-DoF models)
Experimentally simulate the hovering and forward flight conditions in water tank environment
Digital particle image velocimetry (DPIV) technique for flow visualization

3. Research Achievements

Aerodynamic Characteristics and Flow Visualization of an Insect-like Flapping Wings

Accurately measure the aerodynamic forces and moments using rigid and flexible wings
Analyzed the flight dynamics from the aerodynamic forces and moments
Built robust semi-empirical aerodynamic models

Flow Visualization and Aerodynamic Characteristics of an Insect-like Flapping