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A Linear Control Design Structure To Maintain Loop Properties During Limit Operation In A Multi Nozzle Turbofan Engine by Duane L. Mattern

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1NASA Technical Reports Server (NTRS) 19910019874: A Linear Control Design Structure To Maintain Loop Properties During Limit Operation In A Multi-nozzle Turbofan Engine

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The implementation of multi-variable control systems on turbofan engines requires the use of limit protection to maintain safe engine operation. Since a turbofan engine typically encounters limits during transient operation, the use of a limit protection scheme that modifies the feedback loop may void the desired 'guarantees' associated with linear multi-variable control design methods, necessitating considerable simulation to validate the control with limited protection. An alternative control design structure is proposed that maintains the desired linear feedback properties when certain safety limits are encountered by moving the limit protection scheme outside the feedback loop. This proposed structure is compared to a structure with a limit protection scheme that modifies the feedback loop properties. The two design structures are compared using both linear and nonlinear simulations. The evaluation emphasizes responses where the fan surge margin limit is encountered.

“NASA Technical Reports Server (NTRS) 19910019874: A Linear Control Design Structure To Maintain Loop Properties During Limit Operation In A Multi-nozzle Turbofan Engine” Metadata:

  • Title: ➤  NASA Technical Reports Server (NTRS) 19910019874: A Linear Control Design Structure To Maintain Loop Properties During Limit Operation In A Multi-nozzle Turbofan Engine
  • Author: ➤  
  • Language: English

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