FMI-based Multi-domain Simulation For Aero-engine Control Systems

The simulation of an aero-engine control system involves many disciplines due to its complex functions and architecture,which consists of control theory,mechanical,hydraulic,electrical,electronic system and other components.For each discipline,the modeling and simulation is usually done by its own unique commercial software and tool,which makes system-level high-fidelity model simulation,integration and testing very challenging.To meet this challenge,a multi-domain co-simulation method based on Functional Mock-up Interface(FMI)standard is proposed to integrate models developed by different software or tools,leading to successful full-digital co-simulation,which is also successfully integrated into both the FADEC Works(FWorks)digital simulation platform and the hardware-in-the-loop(HIL)real-time platform.The main research work of the thesis includes:Firstly,research on aeroengine modeling is carried out.Based on the T-MATS JT9 D engine model,the modeling principles and methods of aeroengines are introduced,and how to use C and Simulink for hybrid modeling and simulation is explained,this method can improve the modeling efficiency on the promise of ensuring the running speed of the simulation.Secondly,research on control system compents and control law models are carried out.The overall requirements of the aeroengine control system modeling are analyzed.The aeroengine control system components and control law models are established by using different tools,including the use of Simulink to establish the rotational speed sensor model and control law,the Modelica to establish the rotational speed conditioning circuit model,and the AMESim to establish a simplified model of the fuel actuator,which form the basis for multi-domain co-simulation of aeroengine control system.Thirdly,a co-simulation method of control system based on FMI is proposed.The simulation mechanism and interface specification of FMI are introduced;the components conforming to the FMI standard are established,veirified,and integrated into Simulink for those models developed by different software and tools;and the the multi-domain co-simulation is carried out for a typical aeroengine control system.Fourthly,integration and verification of full digital simulation platform is carried out.The FWorks platform is built,with which the FMI functions are integrated,and the input and output interfaces for this FWorks platform are made exactly the same as the ones for the HIL simulation platform,so that the models and control laws developed on the FWorks platform can be seamlessly transfered to the HIL platform.The component level and system level simulation and verification are then performed on this FWorks platform.Finally,integration and verification of HIL platform is carried out.The FMI functions are integrated into the HIL platform,and the models and control laws,verified by the FWorks platform,are transferred to,integrated into,and verified with the HIL platform.The simulation and testing results demonstrate that multi-disciplinary model integration and cross-platform simulation can be realized based on the FMI standard for aero-engine control systems,which lays out a foundation for high-fidelity control system design,simulation,integration and testing.