Object-Oriented Modeling & Simulation Of Aeroengines

A reusable, extensible and flexible aeroengine simulation platform with supporting multidisplinary coupling simulation, multifedilty zooming and distributed parallel computing should be implemented by object-oriented modeling technology. In order to construct a flexible, extensible and reusable simulation platform for aeroengines, an object-oriented analysis and design method is used. The method and process of constructing simulation software for aeroengines with unified modeling language are expounded. The model of the software is described by using case diagrams, class diagrams, sequence diagrams and activity diagrams. Aeroengine model classes,solver classes and user interface classes are programmed with C++ language. On the simulation platform, a steady state and transient model of a twin-spool turbofan engine for control system simulation purpose have been illustrated based on the two ports/connector communication mode. Steady simulation of another twin-spool turbofan engine is tested on the platform, in this case the model classes, solver classes and user interface classes are reused. The factors affected steady simulation fidelity are researched based on the simulation platform. Duct component modeling is improved, air bleed effect is modeled. The effect on the choose of constrained equations and guess vector are addressed. Applying the Newton-Raphson method, the Broyden method and the Gradient method to solve aeroengine constrained nonlinear equations, flexibility of programming, computing speed, computing fidelity are compared. Real time simulation of an middle power twin-spool turbofan is realized based on the volume dynamic effect of the volume between components. In addition, an interactive graphical user interface is programmed base on the created interface classes.