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A Retro-Fit Control Architecture to Maintain Engine Performance With UsageAn outer loop retrofit engine control architecture is presented which modifies fan speed command to obtain a desired thrust based on throttle position. This maintains the throttle-to-thrust relationship in the presence of engine degradation, which has the effect of changing the engine s thrust output for a given fan speed. Such an approach can minimize thrust asymmetry in multi-engine aircraft, and reduce pilot workload. The outer loop control is demonstrated under various levels of engine deterioration using a standard deterioration profile as well as an atypical profile. It is evaluated across various transients covering a wide operating range. The modified fan speed command still utilizes the standard engine control logic so all original life and operability limits remain in place. In all cases it is shown that with the outer loop thrust control in place, the deteriorated engine is able to match the thrust performance of a new engine up to the limits the controller will allow.
Document ID
Acquisition Source
Glenn Research Center
Document Type
Conference Paper
Litt, Jonathan S.
(Army Research Lab. Cleveland, OH, United States)
Sowers, T. Shane
(Analex Corp. Cleveland, OH, United States)
Garg, Sanjay
(NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
August 23, 2013
Publication Date
September 1, 2007
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
Meeting Information
Meeting: 18th ISABE Conference
Location: Beijing
Country: China
Start Date: September 1, 2007
Sponsors: International Society for Airbreathing Engines
Funding Number(s)
WBS: WBS 457280.
Distribution Limits
Public Use Permitted.
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