Effect on fuel efficiency of parameter variations in the cost function for multivariable control of a turbofan engine
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Authors
Dougherty, Barry Lawrence
Subjects
Multivariable control
F100 turbofan engine
Jet engine control
Jet engine fuel efficiency
F100 turbofan engine
Jet engine control
Jet engine fuel efficiency
Advisors
Collins, Daniel J.
Date of Issue
1981-09
Date
September 1981
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
In modern turbofan engines, variable geometry has been incorporated to improve some off-design performance. Most control designs ignore this variable geometry and use fuel metering as the primary control input. This thesis investigates the use of variable geometry to control the engine and, thereby, reduce fuel consumption due to transients. Additionally, steady-state trim conditions are altered to reduce the static fuel consumption. The non-linear transient simulation program is used to analyze the steady-state operating condition and develop small perturbation control limitations. Linear models, both large and reduced order, are used in analyzing the effect of controllers on system response. A computer program was generated to reduce a large order linear model to a usable size for control system development, This analysis shows the reduced-order regime dependent controllers to be viable and to favorably enhance the quest for reducing specific fuel consumption in existing engines.
Type
Thesis
Description
Series/Report No
Department
Department of Aeronautics
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.