AVIATION BLADE PROFILE CHORD LENGTH MEASUREMENT METHOD AND SYSTEM BASED ON SECANT ROTATION ITERATION

摘要

An aviation blade profile chord length measurement method and system based on secant rotation iteration, relating to the field of aviation blade profile measurement. The method comprises: taking a connection line between two farthest points in a blade profile contour point set as a secant, rotating or translating the secant to enable the secant to intersect with a blade basin, and obtaining a leading edge point set and a trailing edge point set; rotating the secant within the range of the leading edge point set and the trailing edge point set to obtain tangent points of the secant and the leading edge and the trailing edge, and calculating the distance between the two tangent points to obtain the chord length. The calculated chord length is high in accuracy; the size of the blade can be controlled by means of the chord length of the blade, and if the chord length is too short, the strength of the blade is reduced, thereby affecting the impact resistance and the aerodynamic performance of the blade; thus, the aerodynamic performance and safety of the blade can be ensured when the chord length of the blade is measured using the method.