2015/10/06 by Guillaume Strub, Spilios Theodoulis, Vincent Gassmann +2
Engineering · #Aerospace and Aviation Technology #Real-time simulation and control systems #Adaptive Control of Nonlinear Systems
paper · doi:10.2514/1.a33330
This paper details the design of a pitch axis autopilot for an 80 mm fin-stabilized, canard-guided projectile and its validation on a hardware-in-the-loop test setup. This setup is built around an autonomous projectile prototype, which is installed in the test section of a wind tunnel by the means of a 3-degrees-of-freedom gimbaled structure. The autopilot design is based on a family of linearized dynamic models of the projectile, whose parameters were estimated from experimental data. Several control approaches are considered. Using the robust control framework, a full-order disturbance rejection controller is designed, taking into account the limited actuator dynamics. A fixed-order, fixed-structure controller of lower complexity with the same performance objective is also designed, using a nonsmooth technique. The tracking performance of these controllers is improved with the addition of a feedforward controller. A final approach considers the disturbance rejection and reference tracking as a multi-objective problem, in which the feedback and the feedforward controllers are designed in a single step. The performance of these approaches is then assessed and compared using numerical simulation as well as experimental results gathered from the hardware-in-the-loop setup.