Receptance-Based Active Aeroelastic Control Using Multiple Control Surfaces

摘要

In this Note, multi-input state-feedback and output state-feedback control methods are developed to extend the flutter boundaries for aeroelastic wing models via active pole placement The control gains are computed purely from the available receptance FRFs, and hence they do not require any prior knowledge of the mathematical models of aeroelastic wing structures and aerodynamic loads. These control gains are dependent upon the open-loop transfer functions, which allows the control (FBE) to be designed for the entire flight envelope during the testing phase. The proposed method differs from other state-space approaches for active aeroelastic control problem in which the primary interest is to compute the control gains for desired objectives while maintaining its stability. The control design via pole placement allows the designer to shape the closed-loop response and target the desired FBE. Similar to the limitation of state-space in which a limited number of modes, associated with a reduced order model, are targeted for control, this method also allows the designer to choose the modes and associated poles for their assignment. The control method is demonstrated using a flexible wing model and finite-element-based delta fighter wing model with multiple control surfaces. It is shown that the numerical receptances from these models can be extracted and used for control gain computations for the active pole placement and FBE.