2016 年 82 巻 844 号 p. 16-00009
This paper deals with the flutter analysis of a rectangular sheet flexibly supported by a wire at the leading edge of the sheet subjected to axial fluid flow. The unsteady fluid force acting on the sheet surface is calculated by using Doublet-point method, which is based on unsteady lifting surface theory. The equation of motion of the sheet coupled with the wire is derived by employing the finite element method. Flutter velocity, frequency and mode are examined through the root locus of the flutter determinant of the system with changing flow velocity. Moreover we measure the flutter velocity and frequency. Flutter characteristic is clarified by comparing the analytical results with the experimental results. To organize the analytical and experimental results, we develop equivalent bending stiffness and torsional stiffness of the leading edge supported by the wire. Then the parameters of wire (tension, length, diameter and Young's modulus) are reduced in two dimensionless numbers (dimensionless equivalent bending stiffness and torsional stiffness). Moreover we organize the analytical and experimental results using these dimensionless numbers.
