Robust flutter suppression for a 2-dimensional wing-store system

Abstract

In this paper, a new scheme is proposed to model the flow speed uncertainties in an aeroelastic system. Compared with the traditional method, the new scheme is based on a signal transformation so as to reduce the dimension of the mathematical model of the flow speed uncertainties. Thus, the robust flutter controller can be designed easily via the reduced-order model of the aeroelastic system. To illustrate the procedure of proposed scheme, the dynamic equation of a two-dimensional wing-store aero-servo-elastic system with flow speed uncertainties is modeled by using the proposed scheme. The aerodynamic forces of the wing section and the store are computed through the use of doublet lattice approach and slender-body aerodynamic theory, respectively. To suppress the flutter instability of the wing-store aeroelastic system with flow speed uncertainties, the trailing-edge control surface is used as a control input and a single-input and multi-output (SIMO) controller is designed via the robust control theory. Numerical results indicate that, with the proposed scheme, the robust flutter control law is efficient and the flutter boundary of aeroelastic system can be greatly expanded.