Incorporating Flight Data into a Robust Aeroelastic Model

Rick Lind, Marty Brenner
1998 Journal of Aircraft  
Stability analysis and control synthesis for high-performance aircraft must account for errors in the aircraft model. This paper introduces a method to update a theoretical model using measured ight data. Variations between the ight data and model are represented as uncertainty operators in a robust stability framework. The structured singular value can directly account for these uncertainty operators to compute stability margins robust to the associated dynamical variations. This procedure is
more » ... sed to formulate an uncertain model of an F/A-18 ghter aircraft and compute stability margins that indicate the worst-case utter conditions. Nomenclature C = damping matrix K = stiffness matrix M = mass matrix Q = unsteady aerodynamic forces q = dynamic pressure W = weight for input multiplicative uncertainty D = uncertainty matrix d = uncertainty scalar m = structured singular valuē s = maximum singular value
doi:10.2514/2.2320 fatcat:5mwqft4vmbdtbbgkcp3vclq3qm