Design of controller reduction of helicopters based on Krylov subspace

The order of helicopter controller is usually high.How to reduce the order of controller as much as possible and preserve the performance of closed-loop system is a problem which needs solving.In this paper,a Krylov subspace method is applied to H_∞ controller reduction of UH-60A helicopter.It is shown that the proposed method can not only match the desired closed-loop system responses,but also does not need solving any Lyapunov equations and using computational tools,greatly reducing computation work.The simulation results also show the effectiveness of the method.