Insects are excellent fliers because of their ability to generate precise wing kinematics and deform wings for the sufficient production unsteady aerodynamic forces. Most previous studies on effects aerodynamics have been limited use rigid wings, leaves contribution flexibility unknown. Here, an experiment was conducted investigate effect varied sweep duration timing rotation characteristics ho...

The design of efficient flapping wings for human engineered micro aerial vehicles (MAVs) has long been an elusive goal, in part due to the large size of the design space. One strategy for overcoming this difficulty is to use a multi-fidelity simulation strategy appropriately balances computation time and accuracy. We compare two models with different geometric and physical fidelity. The low-fid...

The authors research and develop a flapping wing type robotic fish (shark ray robot) with flexible tail fin as an advanced underwater vehicle. The flapping wing consists of multijoints mechanism to get lift force and rotation moment for high maneuvering characteristics of motion. The tail fin is designed by elastic oscillating system and developed to produce strong propulsion force for higher s...

Flapping wing robots show promise as platforms for safe and efficient flight in near-human operations, thanks to their ability agile maneuver or perch at a low Reynolds number. The growing trend the automatization of these has go hand with an increase payload capacity. This work provides new passive morphing prototype this type UAV. is based on biased elastic joint holistic research also includ...

Many research studies have investigated the characteristics of bird flights as a source bioinspiration for design flapping-wing micro air vehicles. However, to best authors’ knowledge, no drone targeted exploitation aerodynamic benefits associated with avian group formation flight. Therefore, in this work, conceptual novel multi-flapping-wing that incorporates multiple pairs wings arranged V-sh...

Flying insects may enhance their flight force production by contralateral wing interaction during dorsal stroke reversal ('clap-and-fling'). In this study, we explored the forces and moments due to clap-and-fling at various wing tip trajectories, employing a dynamically scaled electromechanical flapping device. The 17 tested bio-inspired kinematic patterns were identical in stroke amplitude, st...

Thank you for your consideration of the manuscript entitled “Surprising Behaviors in Flapping Locomotion with Passive Pitching.” We were pleased to receive the positive feedback from the referees. In our revised submission we have made a number of adjustments in response to the referees’ comments and suggestions. In response to the first referee’s comments, we have added to the paper a short ex...

The jellyfish-like flying machine is a new development direction of the future bionic flapping-wing aircraft besides insect-mimic and bird-mimic micro air vehicles (MAVs). To better understand underlying fluid mechanisms flyer, we numerically simulated aerodynamic forces three-dimensional flapping wings under different control parameters. effects amplitude, vortex wake, up-flight speed, wing–wi...

Nomenclature C = chord length, m C T = thrust coefficient f = flapping frequency, Hz h tip = plunge amplitude at the wing tip, m k = ωC∕U ∞ , reduced frequency l span = wingspan, m Re = U ∞ C∕ν, Reynolds number r z = z-directional distance away from the wing tip, m S wing = wing area, m 2 St = fh tip ∕U ∞ , Strouhal number U ∞ = freestream velocity, m∕s ν = kinematic viscosity of fluid, m 2 ∕s ...

This paper presents an overview of the on-going research activities at Shrivenham, aimed at the design of an autonomous flapping-wing micro air vehicle. After introducing the problem of insect wing kinematics and aerodynamics, we describe our quasi-three-dimensional aerodynamic model for flapping wings. This is followed by a brief discussion of some aerodynamic issues relating to the lift-gener...