Modeling State-Space Aeroelastic Systems Using a Simple Matrix Polynomial Approach for the Unsteady Aerodynamics

摘要: A simple matrix polynomial approach is introduced for approximating unsteady aerodynamics in the s-plane and ultimately, after combining coefficients with matrices defining structure, a of flutter equations motion (EOM) formed. technique recasting matrix-polynomial form EOM into first order also presented that can be used to determine eigenvalues near origin everywhere on complex plane. An aeroservoelastic (ASE) have been generalized include gust terms right-hand side. The reasons developing new are presented, which following: first, "workhorse" methods such as NASTRAN analysis lack capability consistently find roots origin, along real axis or accurately farther away from imaginary plane; and, second, existing methods, Roger s approximation method implemented ISAC, do not always give suitable fits some tabular data aerodynamics. available MATLAB will fit aerodynamic force (GAF) form. root-locus results pknl analysis, ISAC-Roger's present compared accuracy number locations roots.