Propulsive Force and Efficiency of Flapping Aerofoil
Unsteady Flow past a Flapping Aerofoil\ud
... thrust. Flapping motion of birds has a coupled pitching and plunging oscillation with some phase difference between ...of flapping wings and shed some light on the lift, drag, and propulsive power ...
6
Estimate of propulsive force in front crawl swimming in young athletes
... swimmer’s efficiency depends in large part on the body surfaces (upper and ...greater force in opposition to the propulsive forces resistant to swimming progress, which are indicators of high-yield ...
6
Relationship between vortex ring in tail fin wake and propulsive force
... Using a quite different approach, Gharib and others proposed a new idea that would lead to an optimal condition for vortex ring generation based on a piston- nozzle model; they discussed the condition by introducing a ...
29
Characteristics of Three dimensional Vortex Formation and Propulsive Performance in Flapping Locomotion
... to force generation, some characteristics of unsteady fluid physics for flapping propulsors were ...of force acting on them without sacrificing thrust performance, which is also good in reducing the danger of ...
157
Propulsive performance of biologically inspired flapping foils at high Reynolds numbers
... by flapping foil motion, optimized through years of evolution, is ubiquitous in nature, yet marine propulsors inspired by examples of highly maneuverable marine life or aquatic birds are not widely implemented in ...
6
The implications of low speed fixed wing aerofoil measurements on the analysis and performance of flapping bird wings
... reliable force balance and wake measurements in the Re regime 10 4 –10 5 . The birds in the Lund facility are trained to fly centred on a luminescent marker in reduced light conditions. Their wakes are sampled far ...
9
Investigation into the propulsive efficiency characteristics of a ship with the Gate Rudder propulsion
... As shown in Figure 11 for the velocity distributions, it is obvious that the GATE RUDDER® does not affect the flow field around the ship stern so much in front of the propeller except the upper parts, which are indicated ...
10
The `upstream wake' of swimming and flying animals and its correlation with propulsive efficiency
... hydrodynamic force is zero instantaneously. The force is typically oscillatory, resulting in periodic acceleration and deceleration of the swimmer, as shown in ...
9
Aerodynamic efficiency of flapping flight: analysis of a two stroke model
... A criterion for comparing the aerodynamic cost of a wing undergoing different hovering wing motions For animals and airplanes, the total energetic cost is measured by the consumption of their respective fuels. At the ...
5
Hydrodynamic Performance of Aquatic Flapping: Efficiency of Underwater Flight in the Manta
... mean force coefficients differ by less than ...the flapping fins in steady swimming, a uniform flow of speed U passing the tethered manta model was utilized to save on computation ...per flapping ...
26
Distributed sensing in flexible robotic fins: propulsive force prediction and underwater contact sensing
... strong force is mostly directed laterally, whereas the instroke motion creates strong forces in the thrust and lateral ...Mean force magnitudes increase monotonically as fin beat periods are ...0.65Hz ...
319
Propulsive efficiency in drag-based locomotion of a reduced-size swimmer with various types of appendages
... 160 corresponds to the power stroke and T r = 61A 30ω to the recovery stroke. Finally, t 1 = 18ω A is the time that W (t) requires to reach the initial steady angular speed, for C 2 continuity. The swimmer’s body is ...
15
Propulsive efficiency in drag-based locomotion of a reduced-size swimmer with various types of appendages
... Keywords: Propulsive efficiency, drag-based swimming, immersed boundary method, numerical simulations, aquatic locomotion ...forward force (thrust) to overcome the induced resistive ...
16
In line motion causes high thrust and efficiency in flapping foils that use power downstroke
... that flapping foil kinematics consisting of a power downstroke and a feathering upstroke together with a properly timed in-line motion, similar to those employed in forelimb propulsion of sea turtles, can produce ...
9
Flapping Wing Report
... high efficiency of the ...of propulsive forces through the flapping ...insect flapping wings are not yet fully ...wing flapping plane continuously adjusts with the body axis which also ...
166
Mechanisms to increase propulsive force for individuals poststroke
... body weight and therefore decrease the force needed from their legs. In addition, the use of a handrail may cause in- dividuals to lean their body toward the handrail rather than staying upright. This body leaning ...
8
The Esophageal Propulsive Force: Esophageal Response to Acute Obstruction
... The response of the normal human esophagus to an obstructing intraluminal bolus was investigated and compared to the response evoked by transient intraluminal distention. A balloon, immobilized within the esophagus by ...
12
CiteSeerX — Lift force control of a flapping-wing microrobot
... lift force to cause a vertical ascent of the ...a force larger than 35 mg with f r = 105 ...lift force larger than 35 mg, but also because the maximum achievable force exceeds 50 mg, allowing ...
8
Energy efficiency of ship propulsive systems: rudder propeller interaction
... Molland, A.F. and Turnock, S.R. (2007) Marine rudders and control surfaces: principles, data, design and li i O f d UK B h H i 86 applications, Oxford, UK, Butterworth-Heinemann, 386pp. Molland, A.F., Turnock, S.R. and ...
30
Propulsive force calculations in swimming frogs I A momentum–impulse approach
... Discussion In our impulse–momentum approach, we consider the fluid dynamic force to consist primarily of the fluid momentum. The frog accelerates a volume of water backwards by applying force to the ...
9