Subsystem identification of reduced-order model for an aeroservo-elastic closed-loop system

Abstract

This paper presents an approach for reduced-order modeling (ROM) of the aerodynamic-response subsystem of an aeroservo-elastic (ASE) closed-loop system. By representing the latter in modal coordinates, an inverse model can be derived that expresses the closed-loop relation between the modal displacements and an exogenous flap action. A ROM of aerodynamic response can thus be identified without measurement of aerodynamic forces. The Hammerstein model with μ-Markov structure and a two-step nonlinear identification method is employed. For demonstration, the method is applied to computational aero-elasticity data.