INTEGRATED FLIGHT PROPULSION CONTROL - SUBSYSTEM SPECIFICATIONS/

In many systems it is required or desirable to implement a control law in a partitioned or decentralized architecture comprised of subsystem s. This paper presents a technique for deriving specifications for eac h subsystem that, if met, guarantee that total system performance (e.g ., stability) goals will be met when the subsystems are combined. The approach is based on the concepts of robust control theory and generat es results that are expressed in the frequency domain as allowed error envelopes about nominal requirements. Although emphasis is placed on generating specifications that guarantee only the stability of the com bined system, extensions that would guarantee performance are also dis cussed. The focus of the paper is the integrated flight/propulsion con trol problem in which specifications on the propulsion system are deri ved based on the mission-level requirements of the aircraft. However, the results are generally applicable. A numerical example demonstratin g the application of the procedure is included.