Title:
C-MAPSS Commercial Modular Aero-Propulsion System Simulation
Description:
The Commercial Modular Aero-Propulsion System Simulation (C-MAPSS) is a tool for the simulation of a realistic large commercial turbofan engine. The code is a combination of Matlab (The MathWorks, Inc.) and Simulink (The MathWorks, Inc.) with a number of graphical user interface (GUI) screens that allow point-and-click operation and with editable fields that allow the user to enter specific values of his/her own choice. In addition to the engine model which produces about 90,000 lb of thrust, the package includes an atmospheric model capable of operation at (i) altitudes from sea level to 40,000 ft, (ii) Mach numbers from 0 to 0.90, and (iii) sea-level temperatures from –60 to 103 °F. The package also includes a power-management system that allows the engine to be operated over a wide range of thrust levels throughout the full range of flight conditions. A comprehensive control system is included that consists of (i) a fan-speed controller for which the user specifies the throttle-resolver angle (TRA), (ii) three high-limit regulators that prevent the engine from exceeding its design limits for core speed, engine-pressure ratio, and HPT exit temperature, (iii) a fourth limit regulator that prevents the static pressure at the HPC exit from going too low, (iv) acceleration and deceleration limiters for the core speed, and (v) a comprehensive logic structure that integrates these control-system components such that integrator-windup problems are avoided. All of the gains for the fan-speed controller and the four limit regulators are scheduled such that the controller and regulators perform as intended over the full range of flight conditions and power levels.
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