An Automatical Matching Method Applied in Kinematics Measurement for the Flapping Rotary Wing

In this paper, a method to track marked points on the wings automatically to describe the wing kinematics in the coupled wing motion of flapping, pitching and rotating is introduced. The marked points on the surface of wings as tracking targets are determined, detected and matched by using digital image processing techniques. Three dimensions coordinates in marked points can be reconstructed by integrated 2D coordinates from multi-camera images and cameras calibration. By this method, it is shown in one flapping cycle, the trend of flapping angular speed various with time is approximate trapezoid function; the pitch angle changes rapidly; the rotation speed fast enhances 3.5 times as flapping frequency increase only 45%. It is possible aerodynamic effective can be improved remarkably.