Accession Number : AD0602830

Title :   PURE BENDING FLUTTER OF A SWEPT WING IN A HIGH DENSITY, LOW SPEED FLOW,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE FLUID DYNAMICS RESEARCH LAB

Personal Author(s) : Dugundji,John ; Ghareeb,Nancy

Report Date : MAR 1964

Pagination or Media Count : 102

Abstract : The pure bending flutter of a uniform, high aspect ratio, swept wing is studied in detail. Velocity component aerodynamic strip theory is used with both quasi-steady and unsteady Theodorsen function representations. The problem is non-dimensionalized, and exact solutions are obtained, thereby eliminating problems of modal convergence. Effects of structural damping and belowflutter response are also examined. It is shown that below certain critical values of mass density ratio mv, flutter does not occur. Also, at the lower values of mv, increasing the sweepback of a given wing lowers the flutter speed significantly until a critical angle is reached beyond which the flutter speed rises sharply to infinity. The mode shapes at flutter change from a standing wave type at high values of mv to a traveling wave type at low mv. Quasi-steady theory is generally unconservative in flutter speed when compared with complete unsteady theory. (Author)

Descriptors :   (*SWEPT WINGS, FLUTTER), (*FLUTTER, THEORY), VELOCITY, GAS FLOW, LIFT, DEFLECTION, AERODYNAMIC CHARACTERISTICS, FUNCTIONS(MATHEMATICS), DIFFERENTIAL EQUATIONS, PARTIAL DIFFERENTIAL EQUATIONS, DAMPING, PRESSURE, BOUNDARY LAYER, AEROELASTICITY

Distribution Statement : APPROVED FOR PUBLIC RELEASE