Title :
Digital control system design for a unique nonlinear MIMO process using QFT technique
Author_Institution :
Lawrence Livermore Nat. Lab., CA, USA
fDate :
9/1/1995 12:00:00 AM
Abstract :
A 19-input, 106-output thermal process is closed-loop-stabilised to meet time- and frequency-domain performance criteria. A unique nonlinear process modelling technique is used to transform several nonmeasurable process parameters into two `state-dependent linear variables´ (gain and dominant pole location) with quantified uncertainty. A linear equivalent model set with quantified uncertainty is amenable to the quantitative feedback theory (QFT) design technique, and the analogue multiloop compensation was developed using QFT. Because the system primarily functions as a regulator, a simplified MIMO system decoupling method, specific to this type of process, was developed and demonstrated. The resulting digital control system is in operation on the Uranium Atomic Vapor Laser Isotope Separation Demonstration System at the Lawrence Livermore National Laboratory
Keywords :
MIMO systems; closed loop systems; control system synthesis; digital control; feedback; frequency-domain analysis; laser isotope separation; nonlinear systems; parameter estimation; process control; stability; time-domain analysis; MIMO systems; Uranium Atomic Vapor Laser Isotope Separation; closed loop stability; digital control system; frequency-domain analysis; nonlinear process; parameter identification; quantitative feedback theory; thermal process; time-domain analysis;
Journal_Title :
Control Theory and Applications, IEE Proceedings -
DOI :
10.1049/ip-cta:19952022