On the Estimation Algorithm Used in Adaptive Performance Optimization of Turbofan Engines
España, Martin D. and Gilyard, Glenn B. (1993) On the Estimation Algorithm Used in Adaptive Performance Optimization of Turbofan Engines. Technical Report NASA TM-4551, Research Engineering, NASA Dryden Flight Research Center.
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Abstract
The performance seeking control algorithm is designed to continuously optimize the performance of propulsion systems. The performance seeking control algorithm uses a nominal model of the propulsion system and estimates, in flight, the engine deviation parameters characterizing the engine deviations with respect to nominal conditions. In practice, because of measurement biases and/or model uncertainties, the estimated engine deviation parameters may not reflect the engine's actual off-nominal condition. This factor has a necessary impact on the overall performance seeking control scheme exacerbated by the open-loop character of the algorithm. In this report, the effects produced by unknown measurement biases over the estimation algorithm are evaluated. This evaluation allows for identification of the most critical measurements for application of the performance seeking control algorithm to an F100 engine. An equivalence relation between the biases and engine deviation parameters stems from an observability study; therefore, it is undecided whether the estimated engine deviation parameters represent the actual engine deviation or whether they simply reflect the measurement biases. A new algorithm, based on the engine's (steady-state) optimization model, is proposed and tested with flight data. When compared with previous Kalman filter schemes, based on local engine dynamic models, the new algorithm is easier to design and tune and it reduces the computational burden of the onboard computer.
| EPrint Type: | NASA Technical Memorandum |
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| Keywords: | Adaptive optimization, F-15 PSC, Measurement biases influence, Parameter estimation, Performance seeking control, Propulsion systems |
| Subjects: | (01 - 09) Aeronautics: (07) Aircraft Propulsion And Power (01 - 09) Aeronautics: (05) Aircraft Design, Testing And Performance Aircraft/Project: F-15 PSC |
| ID Code: | 1016 |
| Deposited On: | 14 July 2006 |
| Additional Information: | 34 pages. Prepared as paper 93-1823 for the AIAA Joint Propulsion Conference, June 28–July 1, 1993, Monterey, CA. |
