Biomimetic propulsion under random heaving conditions, using active pitch control

Politis, Gerasimos; Politis, Konstantinos D.

doi:10.1016/j.jfluidstructs.2012.05.004

Cited by 29 publications

(10 citation statements)

References 16 publications

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“…Negative values indicate power required by the system. Similar findings have been reported by Politis and Politis [20], in the case of pitching and heaving wing in infinite flow domain, without consideration of the free-surface effects.…”

Section: Numerical Results and Discussionsupporting

confidence: 89%

“…As it has been suggested by Politis and Politis [20] the controlled pitch angle is set proportional to the angle ε, i.e. Â(t) = w ε(t), with the pitch control parameter w ranging from 0 to 1, and thus, the angle of attack finally becomes…”

Section: Flapping Wingmentioning

confidence: 99%

“…Furthermore, the rotational motion of the hydrofoil, considered to be positive counterclockwise, is defined with respect to a rotation axis located at distance x R = c/3 from the leading edge for minimisation of the required torque. The latter self-pitching motion of the foil is properly controlled as a function of its vertical heaving history motion; see Politis and Politis [20] and Belibassakis and Politis [11].…”

Section: Hydrofoil Motionmentioning

confidence: 99%

See 2 more Smart Citations

Ship propulsion in waves by actively controlled flapping foils

Belibassakis

Filippas

2015

Applied Ocean Research

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Section: Numerical Results and Discussionsupporting

confidence: 89%

Section: Flapping Wingmentioning

confidence: 99%

Section: Hydrofoil Motionmentioning

confidence: 99%

See 1 more Smart Citation

Ship propulsion in waves by actively controlled flapping foils

Belibassakis

Filippas

2015

Applied Ocean Research

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“…As in Politis and Politis [15] and Belibassakis and Politis [4], the pitch-controlled angle of attack is taken as a constant times . We denote this constant the pitch-control parameter, w pc .…”

Section: Controlling the Foil Pitchmentioning

confidence: 99%

Experiments with actively pitch-controlled and spring-loaded oscillating foils

Bøckmann

Steen

2014

Applied Ocean Research

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“…. (6) where ȳ c is the non-dimensional camber as a function of the non-dimensional chord x, while p and x p are calculated from Equations (4) and (5) respectively. Figure 16 compares the 10 measured and smoothed camber lines.…”

Section: Wing Camber Estimationmentioning

confidence: 99%

Experimental and numerical study of the flight of geese

et al. 2015

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The flight of barnacle geese at airspeeds representing high-speed migrating flight is investigated using experiments and simulations. The experimental part of the work involved the filming of three barnacle geese (Branta Leucopsis) flying at different airspeeds in a wind tunnel. The video footage was analysed in order to extract the wing kinematics. Additional information, such as wing geometry and camber was obtained from a 3D scan of a dried wing. An unsteady vortex lattice method was used to simulate the aerodynamics of the measured flapping motion. The simulations were used in order to successfully reproduce the measured body motion and thus obtain estimates of the aerodynamic forces acting on the wings. It was found that the mean of the wing pitch angle variation with time has the most significant effect on lift while the difference in the durations of the upstroke and downstroke has the major effect on thrust. The power consumed by the aerodynamic forces was also estimated; it was found that increases in aerodynamic power correspond very closely to climbing motion and vice versa. Root-mean-square values of the power range from 100W to 240W. Finally, it was observed that tandem flying can be very expensive for the trailing bird.

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Biomimetic propulsion under random heaving conditions, using active pitch control

Cited by 29 publications

References 16 publications

Ship propulsion in waves by actively controlled flapping foils

Ship propulsion in waves by actively controlled flapping foils

Experiments with actively pitch-controlled and spring-loaded oscillating foils

Experimental and numerical study of the flight of geese

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