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A Multi-loop Switching Controller for Aircraft Gas Turbine Engine with Stability Proof

Amin Imani* and Morteza Montazeri-Gh
International Journal of Control, Automation, and Systems, vol. 17, no. 6, pp.1359-1368, 2019

Abstract : In this paper, a Min-Max switching controller containing multiple state feedback regulators and fuel flow rate saturation is designed for a high bypass two-spool turbofan engine. Due to the switching nature of Min-Max algorithm and the presence of saturation function,stability analysis is an important issue in the process of controller design. Therefore, amethodology is presented to analyze the stability of the closedloop system. For this objective, the Min and Max selectors and the saturation block are replaced by their nonlinear equivalents and the structure of the control system is transformed into the canonical configuration of Lure’s system. Then, the condition for absolute stability is extracted using the Multivariable Circle Criterion. An asymptotic stability proof is achieved for the closed loop system and the performance of the designed multiregulator Min-Max controller in tracking a desired fan speed scenario and limit management is compared with the well-known Min-Max/SMC technique.

Keyword : "Asymptotic stability, Min-Max switching scheme, saturation function, state feedback, turbofan engine. "

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