Dynamic Modeling of a Turboshaft Engine Driving a Variable Pitch Propeller: a Decentralized Approach

In this paper, a nonlinear performance based model for a twin spool turboshaft engine which drives a variable pitch propeller, is developed . Then a piecewise linear representation of the model, which can be used for control of the turboshaft engine for large throttle commands (i.e. for the entire ight envelope), is developed. Open loop simulation results of SPT5 engine dynamics, using piecewise linear modeling approach, are presented. Finally, a decentralized piecewise representation of the model suitable for distributed and decentralized engine control, is developed. Simulation results for decentralized piecewise linear control of the JetCat SPT5 turboshaft engine also are presented. Fuel ow is the control input for the engine core subsystem, and prop pitch angle is the control input for the engine fan/prop subsystem.

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