Flying Insect Motion Parameters And Wing Deformation Optical Measurement And Presentation

The research of Micro Aerial Vehicle (MAV) becomes a hotter topic in recent years, because of its importance on the scout for the military, this research area has a very bright future. The size of the MAV is similar with the insects, so many people focused their research on the aerodynamic theory of the insects. There have been many research work on the measurement of the insects' movement parameters, but by now, the research on the free flight insect still can not reach our prospect, and the measurement method which has been used can not obtain a result with high precision. Especially, it is still unknown that what influence the flexible effect have on the flight mechanism of the insect, partially it is because there is not any measurement report about the detail of the wing's deformation in free flight.In this thesis, the sine fringes pattern projection method is proposed to be used to mesure the wing's deformation of the dragonfly when it is flying. The digital sine fringe patterns are generated by the computer, and then projected on to the testing object by the projector, and finally the height can be measured by recording the distorted fringe patterns. A simulated flapping model is devised to drive the real dragonfly's wing flapping at about the same frequency with the real dragonfly, and the sine fringe patterns are projected onto the wing to mesure its deformation. Then the Spacial Carrier Phase method is used to calculate the wrapped phase, and the unwrapped phase can be obtained by the region correlation phase unwrapping method. Finally we obtained accurate result. And by doing this, the sine fringe patterns projection method is verified to be used in the measurement of the dragonfly's wing's deformation.The purpose of this thesis is to measure the deformation of free-flight dragonfly's wings which is more significative. But the flapping mode is more stable under the restricted condition. So in this experiment, the restricted flapping mode,the direct forward flight and the turning flight were all measured by the sine fringe patterns projection method. In the data processing section, the 2-D windowed Fourier transform method is used to obtain the wrapped phase, and the 2-D weighted Least-Squares phase unwrapping method is used to unwrap the phase. By using these methods, the precise result can be obtained in despite of the bad quality of the original data. Then the flapping angle ,torsional angle and the camber deformation are compared and analysed in the three different flight modes.For the need of the data processing in this experiment, a software is devised to calculate the 3-D height distribution by the sine fringe projecting method. Its main function include "Fourier transform", "inverse Fourier transform", "windowed Fourier transform", "region correlation phase unwrapping method, "Weighted Least-squares phase unwrapping method", and optimized the software for the measurement of the dragonfly's wings. A software for the show and analysis of dragonfly's flight is also devised in our work. Its main function include "arbitrary transversal analysis", "complanation of the dragonfly's wing", "second curving surface fif " and "third curving surface fit".