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標題: Inertial Regulation for Wing Deformation and Its Mechanical Effects on Insect Flight
作者: 紀凱容
關鍵字: 基礎研究
Inertial regulator
其他(理), 生物科學類
wing deformation
insect flight
high speed videography
particle image velocimetry (PIV)
摘要: 科技的演進(如高速攝影術、流場可視化、及模型建立等)使世人得以探討昆蟲飛行的非穩態流體動力機制。昆蟲的翅膀具有複雜的結構,在飛行時產生顯著的形變,實驗與計算流體力學研究均指出,振翅中產生的形變與所產生的流體動力(如升力)息息相關。證據顯示形變是由兩種力所主控:翅膀的質量所產生的慣性力,以及其材料所造成的彈性恢復力。許多昆蟲翅膀上具有的翅痣結構,由於其無論對振翅關節或翅膀的扭轉中軸均貢獻相當的轉動慣量,無疑將影響翅膀振動及形變,然而至今翅痣對翅膀振動的效應卻尚未經由實驗證實,遑論其對翅膀形變、及昆蟲飛行的影響。本研究將結合運動學、材料力學、以及流體力學的實驗及分析技術,探討翅痣對翅膀形變的慣性調控效應,並研究此效應如何影響翅膀的空氣動力、以及昆蟲飛行。本計畫共有四個主要目標:(一)探討翅痣如何影響拍動翅膀的形變,(二)量測翅膀的彎曲特性,(三)量測翅膀的振動特性,以及(四)探討因翅痣所影響之翅膀形變在流體動力上的效應。我們也將探討生物如何主動調控翅膀形變。我們期待此跨領域之研究計畫,將激發物理、生物、及工程學家對昆蟲飛行的物理原理、演化適應、及微飛行器設計的研究靈感。
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:[1] Examining the effects of pterostigma on wing deformation in flapping motion;[2] Measuring wing's material properties: flexural stiffness under static loading;[3] Measuring wing's material properties: dynamic excitation and natural frequency;[4] 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.
其他識別: NSC99-2112-M005-004
Appears in Collections:物理學系所



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