H8 Aerospace Control Design A VSTOL Flight Application

Recent Developments in H¿ theory have produced a promising new design approach. However, a large gap between theory and practice has emerged, with as yet very few design examples applied to real industrial control problems. The work described in this monograph aims to narrow this gap, and to address implementation issues associated with multivariable H¿ controllers. An H¿ control law has been developed and tested for the DRA (Defence Research Agency) Bedford research Harrier. The first part of this text introduces the basic components of the flight control and engine systems and describes the models for the different sub-systems. The second part deals with implementational problems including the discretization process, handling limitations on actuators and the nonlinearities in the system.

I. Design and implementation of H? controllers.- 1.Introduction.- 2.The Motivation for Robust Control.- 3. A Multivariable Design Case Study.- 4. Robust Design Using Loop-Shaping.- 5. Controller Switching.- 6. Controller Scheduling.- 7. Multivariable Anti-windup.- 8. Controller Complexity.- II. A flight control law for the DRA XW175 research Harrier.- 9.Background.- 10.Linear Design and Analysis.- 11. Discretisation.- 12. Flight Control Modes and Command Precompensation...- 13. Limiters and Non-Linear Aspects.- 14. Unpiloted Time Simulation.- 15. Piloted Simulation and Flight Testing.- 16. Conclusions.- A.List of Variables.- B.Block Diagram.- References.