Possio's Subsonic Derivative Theory and its Application to Flexural-Torsional Wing Flutter PART I Possio's Derivative Theory for an Infinite Aerofoil Moving at Subsonic Speeds PART II Influence of Compressibility on the Flexural-Torsional Flutter of a Tapered Cantilever Wing Moving at Subsonic Speed

摘要

The derivative theory due to C. Possio for an infinite aerofoil moving at subsonic speeds is reviewed, and certain modifications are proposed. Derivative values are calculated for a Mach number of 0.7, and for values of the frequency parameter λ ranging from 0 to 5.0.nConclusions and Further Developments.—For λ <1 the derivative values based on a three-point collocation method are in fair agreement with those given by Possio. For the range 1.0< λ < 2.0 five-point collocation is necessary, while for λ= 5.0 even seven-point collocation may prove unsatisfactory.