Abstract
In this paper, a method for analysis of motion of flapping butterfly is proposed. Time series of angles of 4 joints of wing and abdomen, and position and attitude of thorax are obtained by movies of a free flying butterfly in a wind tunnel with high speed cameras. By applying singular value decomposition, it is divided into 2 principal modes. Contribution of the first mode is about 81%, and of the second is about 17%. By comparing these modes between climbing flight and steady flight about each category, this research shows that difference of control between the two flight states.
