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UID:0-278@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20210118T123000

DTEND;TZID=Asia/Jerusalem:20210118T133000

DTSTAMP:20230525T070702Z

URL:https://aerospace.technion.ac.il/events/fluid-structure-interactions-w
 ith-flapping-compliant-membrane-wings/

SUMMARY:Fluid-Structure Interactions with Flapping\, Compliant Membrane Win
 gs
DESCRIPTION:Lecturer:Gali Alon Tzezana\n Faculty:Center for Fluid Mechanics
 \, School of Engineering\n Institute:Brown University\n Location:https://t
 echnion.zoom.us/j/91638313889\n Zoom: \n Abstract: \n Details: \n Numerous
  animals including fish\, birds\, bats and insects use appendages (fins an
 d wings) with varying levels of flexibility\, to provide propulsion and/or
  weight support as they move through either air or water. Scientists have 
 explored many different aspects of biological swimming and flying\, such 
 as flapping and flexibility effects\, in an attempt to understand the unde
 rlying physical mechanisms and to apply them to engineering applications. 
 Compliant membranes\, used by bats\, flying squirrels\, lemurs and other 
 animals define a specific subset of this class of flexible aerodynamic str
 uctures and is of particular interest due to their negligible thickness an
 d large shape deformations in both steady and unsteady conditions. This wo
 rk deals with the aerodynamic and hydrodynamic characteristics of a flapp
 ing\, compliant membrane wing. A theoretical framework is developed to cha
 racterize the effects of wing compliance\, inertia and flapping kinematics
  on the membrane's performance. As the flapping frequency is increased\, 
 membranes go through a transition from thrust to drag around the resonant 
 frequency\, and this transition is earlier for more compliant membranes. T
 he limitations of the linear\, small-amplitude model are evaluated experim
 entally\, by testing different compliant membranes performing a heaving m
 otion in a water flume. Membrane deformations and force data show a resona
 nt peak close to the natural frequency of the membranes. Thrust is evaluat
 ed through direct measurement as well as wake analysis\, and the limitatio
 ns of both methods are discussed. The analytic model and the experimental
  data provide guidelines to finding membrane and motion parameters to opti
 mize the propulsive performance.\nZoom meeting
CATEGORIES:Seminars
LOCATION:https://technion.zoom.us/j/91638313889

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