|Aircraft CAS Design with Input Saturation Using Dynamic Model Inversion
Sangsoo Lim and Byoung Soo Kim
International Journal of Control, Automation, and Systems, vol. 1, no. 3, pp.315-320, 2003
Abstract : This paper presents a control augmentation system (CAS) based on the dynamic
model inversion (DMI) architecture for a highly maneuverable aircraft. In the application of
DMI not treating actuator dynamics, significant instabilities arise due to limitations on the aircraft
inputs, such as actuator time delay based on dynamics and actuator displacement limit.
Actuator input saturation usually occurs during high angles of attack maneuvering in low dynamic
pressure conditions. The pseudo-control hedging (PCH) algorithm is applied to prevent
or delay the instability of the CAS due to a slow actuator or occurrence of actuator saturation.
The performance of the proposed CAS with PCH architecture is demonstrated through a
nonlinear flight simulation.
Keyword : Stability and control, handling qualities, guidance and control.