Time-resolved wake structure and kinematics of bat flight

Hubel, Tatjana Y.; Hristov, Nickolay I.; Swartz, Sharon M.; Breuer, Kenneth S.

doi:10.1007/978-3-642-11633-9_29

Cited by 27 publications

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“…Although the wake patterns generated by bats are complex (Hedenström et al, 2007;Hubel et al, 2009), simple models such as actuator disk theory can capture some of the relevant connection between kinematics and aerodynamic force production. According to these ideas, a decrease in stroke plane angle should direct the induced velocity of the wing motion more rearward, thereby shifting the contribution of induced velocity towards increased thrust and away from lift generation, to simultaneously overcome increased drag and diminish the lift production of the wings (Pennycuick, 1975).…”

Section: Kinematic Changes With Flight Velocitymentioning

confidence: 99%

The effect of body size on the wing movements of pteropodid bats, with insights into thrust and lift production

Riskin

Iriarte-Diaz

Middleton

et al. 2010

Journal of Experimental Biology

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modes of bats vary widely among families, so we focused on a single family, the Pteropodidae. This family consists of ca. 186 species distributed throughout the paleotropics (Wilson and Reeder, 2005) and is characterized by fruit and nectar-feeding, non-echolocating Accepted 26 None of the bats in our study flew at constant speed, so we used multiple regression to isolate the changes in wing kinematics that correlated with changes in flight speed, horizontal acceleration and vertical acceleration. We uncovered several significant trends that were consistent among species. Our results demonstrate that for medium-to large-sized bats, the ways that bats modulate their wing kinematics to produce thrust and lift over the course of a wingbeat cycle are independent of body size. Supplementary material available online at

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Section: Kinematic Changes With Flight Velocitymentioning

confidence: 99%

The effect of body size on the wing movements of pteropodid bats, with insights into thrust and lift production

Riskin

Iriarte-Diaz

Middleton

et al. 2010

Journal of Experimental Biology

Self Cite

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“…The wake structure behind the flapping wings of the DelFly can be expected to bear resemblance to the wake of flapping animal species. Extensive measurements have been performed in the wake of flapping wings of bats at the University of Lund, which have revealed the existence of closed-loop vortical structures during the flapping motion 13 . Muijres et al 14 identified the aerodynamic features present in the wake of a G. soricina bat: the starting vortex, the tip vortex, the root vortex and a reversed vortex dipole (the latter structure may be formed during part of the upstroke when the wing is producing negative lift).…”

Section: Introductionmentioning

confidence: 99%

Flow Visualization in the Wake of the Flapping-Wing MAV 'DelFly II' in Forward Flight

Percin

Eisma

Oudheusden

et al. 2012

30th AIAA Applied Aerodynamics Conference

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“…This is naturally very convenient when, for instance, estimating mean lift and drag forces of flying animals in equilibrium conditions, e.g., Hubel et al (2009) and Ben-Gida et al (2013). When full time-resolved force estimation is required, and sufficient near-body acceleration data cannot be extracted, the natural next step is to work towards a so-called Derivative-Moment Transformation in which the volume integral is conveniently transformed into a surface integral, as detailed in the next section.…”

Section: Classical Formulationmentioning

confidence: 99%