Research And Development Of Digital Twin Technology For Aero Engine Gas Path System

The aero engine is the heart of the aircraft,and its reliable,stable and safe operation is particularly critical for ensuring flight safety.Therefore,the testing,and condition monitoring through the engine’s full life cycle have become an essential foundation for the safe and reliable operation of the engine due to its complicated functional structure,varied operating conditions,extreme internal environment during continuous operation and limitations of sensor deployment,etc.The data analysis and in-depth application of engine testing and condition monitoring have become hot and challenging issues in the context of the industrial Internet.Related work is of great significance for engine management and maintenance.Digital twin technology with its multi-scale,high-fidelity model,data management throughout the life cycle and other can realize the synchronous reflection of the engine state in the virtual space,and digital twin software can visually display with three-dimensional models,virtual reality and other methods directly show the test and operation status of the engine,therefore,the engine digital twin technology has become a pivotal frontier pursued by the original engine manufacturers,airlines and related research institutions at home and abroad,it has received extensive attention.At the same time,considering the complexity and implementation difficulty of the entire engine system,and the gas path system has a decisive influence on the performance of the engine and it exhibits a high degree of mechanical and electrical thermal coupling characteristics.therefore,this paper develops the engine gas path system digital twin technology research and development.In order to providing assistances for future domestic aircraft engine tests and intelligent operation and maintenance of civil airliners through technological exploration and experimentation.This work designs and develops the digital twin system of the CFM56 series engine gas path system,including the overall scheme of the engine gas system digital twin,the construction and verification of multiple models of the engine gas path system,and the development and verification of the digital twin software.The details are as follows:(1)Carry out the overall design of the digital twin of the CFM56 engine gas circuit system,analyze the engine’s gas circuit parameters,clarify the digital twin function,and use this to establish the overall program consisting of the model and the software;(2)Establish a digital twin model of the engine,perform basic parameter estimation through the mechanism model,perform dynamic parameter estimation through the fusion of the mechanism model and the data-driven model,and use the performance parameter prediction model to predict the parameters;(3)In response to the need for visual visualization of engine data,the development of digital twin software was carried out.Through the dynamic operation of three-dimensional models and the development of human-computer interaction interfaces,users were able to visually observe engine information.In order to verify the availability of the digital twin software of the engine gas path system,the engine operation monitoring data in the state of component performance degradation is generated through simulation,the capability of the digital twin model for parameter estimation and state prediction is verified,and digital twin software 3D rendering,human-computer interaction and other functions are verified.The results show that the established digital twin model is basically consistent with the actual state of the engine,and the developed digital twin software is basically available.