A Simple Dynamic Engine Model for Use in a Real-Time Aircraft Simulation With Thrust Vectoring

Johnson, Steven A. (1990) A Simple Dynamic Engine Model for Use in a Real-Time Aircraft Simulation With Thrust Vectoring. Technical Report NASA TM-4240, Research Engineering, NASA Dryden Flight Research Center.

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Abstract

A simple dynamic engine model was developed at the NASA Ames Research Center, Dryden Flight Research Facility, for use in thrust vectoring control law development and real-time aircraft simulation. The simple dynamic engine model of the F404-GE-400 engine (General Electric, Lynn, Massachusetts) operates within the aircraft simulator. It was developed using tabular data generated from a complete nonlinear dynamic engine model supplied by the manufacturer. Engine dynamics were simulated using a throttle rate limiter and low-pass filter. This paper includes a description of a method to account for axial thrust loss resulting from thrust vectoring. In addition, this paper presents the development of the simple dynamic engine model and its incorporation into the F-18 high alpha research vehicle (HARV) thrust vectoring simulation. The simple dynamic engine model was evaluated at Mach 0.2, 35,000-ft altitude and at Mach 0.7, 35,000-ft altitude. The simple dynamic engine model is within 3 percent of the steady state response, and within 25 percent of the transient response of the complete nonlinear dynamic engine model.

EPrint Type:	NASA Technical Memorandum
Keywords:	Aircraft models, Aircraft simulation, Engine model, F-18 aircraft, Real-time operation, Real-time simulation, Scale models, Thrust distribution, Thrust vector control, Thrust vectoring, Turbofan engines
Subjects:	Aircraft/Project: F-18 HARV (01 - 09) Aeronautics: (05) Aircraft Design, Testing And Performance Aircraft/Project: F-18
ID Code:	367
Deposited On:	27 August 2004
Additional Information:	21 pages. Prepared as AIAA 90-2166 for presentation at the AIAA/SAE/ASME/ASEE Joint Propulsion Conference, Orlando, Florida, July 16–18, 1990.