Verification of H flutter analysis

摘要

FLUTTER analysis is usually performed with basically twonmethods:n1) k class: the k method [1], which predicts the correct flutterninstability;n2) p-k class: the p-kmethod [2,3],which predicts the damping andnfrequency trends fairly correct near zero damping.nThe aforementioned methods are based on generalized aero-ndynamic forces obtained for purely oscillatorymotions (g-invariant).nWhen analyzing flutter diagrams, aeroelasticians are mostly dealingnwith the damping trend in the vicinity of zero damping (g u0003 0) whilenflight control system designers are also interested in damping trendsnin a larger g domain. The prediction of the damping and frequencyntrends can be further improved bymethods belonging to the p-k classnsuch as: