INTEGRATED FLIGHT PROPULSION CONTROL - SUBSYSTEM SPECIFICATIONS FOR PERFORMANCE

In many systems such as integrated flight/propulsion control, it is de sirable to implement the control law in a partitioned or decentralized architecture comprised of subsystems. For designs of this type, havin g a set of subsystem performance specifications early in the design cy cle that is sufficient to guarantee overall performance of the final c ombined vehicle would be beneficial. A procedure is presented in this paper for deriving multiple subsystem specifications from a number of performance requirements on an integrated system. It is based on a str uctured singular-value analysis and generates specifications that are magnitude bounds on subsystem uncertainties. The specifications are de rived from performance requirements that are provided in the form of b ounds on transfer functions of the integrated system. This form allows the expression of model following, command tracking, robustness, and disturbance rejection requirements. The procedure is demonstrated on a short takeoff and landing aircraft design, in which engine specificat ions are derived from the aircraft's velocity and pitch rate tracking requirements.