Evaluating the Dynamic Response of In-Flight Thrust Calculation Techniques During Throttle Transients

Ray, Ronald J. (1994) Evaluating the Dynamic Response of In-Flight Thrust Calculation Techniques During Throttle Transients. Technical Report NASA TM-4591, Research Engineering, NASA Dryden Flight Research Center.

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Abstract

New flight test maneuvers and analysis techniques for evaluating the dynamic response of in-flight thrust models during throttle transients have been developed and validated. The approach is based on the aircraft and engine performance relationship between thrust and drag. Two flight test maneuvers, a throttle step and a throttle frequency sweep, were developed and used in the study. Graphical analysis techniques, including a frequency domain analysis method, were also developed and evaluated. They provide quantitative and qualitative results. Four thrust calculation methods were used to demonstrate and validate the test technique. Flight test applications on two high-performance aircraft confirmed the test methods as valid and accurate. These maneuvers and analysis techniques were easy to implement and use. Flight test results indicate the analysis techniques can identify the combined effects of model error and instrumentation response limitations on the calculated thrust value. The methods developed in this report provide an accurate approach for evaluating, validating, or comparing thrust calculation methods for dynamic flight applications.

EPrint Type:	NASA Technical Memorandum
Keywords:	Aircraft engine simulation, Aircraft engine testing, Aircraft flight test, Dynamic thrust, Performance, Thrust, Thrust validation, Unsteady flow
Subjects:	Aircraft/Project: F-15 HIDEC (01 - 09) Aeronautics: (07) Aircraft Propulsion And Power (01 - 09) Aeronautics: (05) Aircraft Design, Testing And Performance Aircraft/Project: X-29
ID Code:	240
Deposited On:	22 July 2004
Additional Information:	27 pages. Presented as AIAA 94-2115 at the 7th Biennial Flight Test Conference, June 20–23, 1994, Colorado Springs, Colorado.