NDLI: Real Time Analytical Linearization of Turbofan Engine Model

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Chung, Gi-Yun Prasad, J. V. R. Dhingra, Manuj Meisner, Richard
Copyright Year	2013
Abstract	This paper presents a methodology for developing a control oriented analytical linear model of a turbofan engine at both equilibrium and non-equilibrium conditions. This scheme provides improved accuracy over the commonly used linearization method based on numerical perturbation. Linear coefficients are obtained by evaluating at current conditions analytical expressions which result from differentiation of simplified nonlinear expressions. Residualization of the fast dynamics states are utilized since the fast dynamics are outside of the primary control bandwidth. Analytical expressions based on the physics of the aerothermodynamic processes of a gas turbine engine facilitate a systematic approach to the analysis and synthesis of model based controllers. In addition, the use of analytical expressions reduces the computational effort, enabling linearization in real time at both equilibrium and non-equilibrium conditions to enable more accurate capture of system dynamics during aggressive transient maneuvers. The methodology is formulated and applied to a separate flow twin spool turbofan engine model in the Numerical Propulsion System Simulation (NPSS) platform. The derived linear model is validated against the full nonlinear engine model.
Sponsorship	International Gas Turbine Institute
File Format	PDF
ISBN	9780791855188
DOI	10.1115/GT2013-94464
Volume Number	Volume 4: Ceramics; Concentrating Solar Power Plants; Controls, Diagnostics and Instrumentation; Education; Electric Power; Fans and Blowers
Conference Proceedings	ASME Turbo Expo 2013: Turbine Technical Conference and Exposition
Language	English
Publisher Date	2013-06-03
Publisher Place	San Antonio, Texas, USA
Access Restriction	Subscribed
Subject Keyword	Gas turbines System dynamics Simulation Turbofans Dynamics (mechanics) Equilibrium (physics) Control equipment Flow (dynamics) Propulsion systems Engines Physics Transients (dynamics)
Content Type	Text
Resource Type	Article

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