Control of deep-hysteresis aeroengine compressors. II. Design of control laws

In this paper we continue the development of a methodology for control of deep-hysteresis compressors initiated in a companion paper. We develop a family of controllers which are applicable not only to the particular model presented in Part I of this paper, but also to general Moore-Greitzer type models with arbitrary compressor characteristics. For each of our controllers we show that it achieves a supercritical (soft) bifurcation. We also address another key issue for control of rotating stall and surge - the limited actuator bandwidth. Our results show an interesting trade-off: as the actuator bandwidth decreases, the sensing requirements become more demanding.