DECENTRALIZED MULTIVARIABLE CONTROL AND STABILITY OF A GAS-TURBINE ENGINE

The problem of improving the performance and stability of a gas turbin e engine operating throughout the whole flight envelope in the presenc e of predominantly destructive dynamical interactions is addressed. Th e controller structure aimed for in this work is decentralised, thus m aking the system tolerant to soft and/or hard failures while at the sa me time allowing the tuning of every loop separately. The control stra tegy consists of static compensators to minimise the destructive dynam ical interaction between loops, diagonal lead/lag for performance and stability enhancement and a diagonal prefilter to meet steady-state re quirements.