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|標題:||Inertial Regulation for Wing Deformation and Its Mechanical Effects on Insect Flight|
high speed videography
particle image velocimetry (PIV)
Insects are known for their impressive flight capability. Recent development oftechnology (e.g. high-speed videography, modern flow visualization, computational andmechanical modeling, etc.) has advanced our understanding of the unsteady aerodynamicmechanisms of lift-enhancement in insect flight. Insects achieve remarkable flightperformance with a diverse range of complex wing designs. Empirical evidences indicatethat wing deformation occurred during flight has significant influence on generatedaerodynamic forces. It has been demonstrated that the dynamic deformation patterns ofwings are dominated by inertial and elastic processes, remaining largely independent of thepressure distribution resulting from aerodynamic forces. The elastic properties of insectwings have been tested to associate with lift generation; whereas the inertial load from thewing mass contributes to wing rotation and twisting, and thought to play a major role for thefeatures of stroke reversals. Here we propose the first study to examine the mechanicaleffects of an “inertial regulator” pterostigma (a structure located distally from the wing baseand torsion axis, with area density 10 X that the rest of the wing) in determining thedeformation and vibration characteristics of dragonfly wings and subsequently theaerodynamics of insect flight. This project has four specific aims: Examining the effects of pterostigma on wing deformation in flapping motion; Measuring wing's material properties: flexural stiffness under static loading; Measuring wing's material properties: dynamic excitation and natural frequency; Examining the aerodynamic effects of inertial regulated deformation.We hypothesize that (1) pterostigma can enhance deformation in a flapping wing andstabilize vibration in a gliding fixed wing, (2) animals can actively control wing deformation,even when the pterostigma is removed, by manipulating flapping amplitudes in order to keepsimilar wing deformation, and (3) pterostigma has significant effects on generatedaerodynamic forces through inertial regulation of wing deformation. To this end, we willintegrate various techniques to examine the wing kinematics and deformation in both isolatedand intact flapping wings in living dragonflies, to assess the natural frequency and othervibration characteristics of a flapping and gliding wings, to measure the mechanical propertiesof wings under bending loads, and to quantify and analyze the flow field caused by inertialregulated deformation. This project will foster new and exciting multi-disciplinarycollaborations between physicists who seek to explain the phenomenology of insect flight,biologists who seek to understand its relevance to insect physiology and evolution, andengineers who are inspired to build micro-robotic insects using these principles.
|Appears in Collections:||物理學系所|
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