Design Of Civil Airplane Condition Monitoring System Based On MBSE

With the rapid development of social economy in recent years and the growing demand for travel,the demand for mainline aircraft is increasing,but at present,Chinese mainline aircraft mainly relies on imports,and the demand for independent design and production of mainline aircraft is becoming more and more urgent in the new global cold war scenario.With the continuous development of system engineering,Model Based System Engineering(MBSE)has more applications in the aviation field.Compared with traditional development methods,MBSE is a more suitable method for designing civil aircraft systems by replacing documents with models and complying with airworthiness standards.Airplane Condition Monitoring System monitors and records aircraft data related to aircraft maintenance,performance,troubleshooting and trend monitoring,and is an important part of civil aircraft avionics systems.Therefore,the design of the Airplane Condition Monitoring System using the methodology of MBSE is important to achieve the independent development of the avionics system.This thesis is based on the topic of "Modeling Avionics System of Civil Aircraft",and the main work and contributions are as follows:(1)Proposing the model design scheme for complex systems.In view of the drawbacks of the traditional design model which is document-driven,the design framework of Harmony is analyzed,and a Rhapsody-based system design process is proposed by analyzing it vertically;by analyzing it horizontally,a modeling scheme based on the top-level static design of Harmony-SE,SysML and the joint dynamic design of software based on Harmony-SW,UML is proposed.(2)Two key techniques in the design process are investigated.Requirement coverage testing technique: in order to ensure that the created model can completely meet the system requirements,after analyzing and comparing the three requirement tracing methods of collection,matrix and coverage,the requirement coverage testing method is selected to confirm the system requirements based on the Gateway plug-in of Rhapsody platform.Automatic code generation technology: Based on the OXF framework,the class diagram model was converted to code in Rhapsody platform according to the UML model-to-code conversion rules,and the bidirectional association between the model and the code was verified.(3)Using the above methods and techniques,the Airplane Condition Monitoring System is designed and implemented.According to ARINC624-1 protocol,the modeling and software design of the Airplane Condition Monitoring System are carried out.On the basis of complete functionality and system integrity,the maintainability of the system is improved,the connection between model design and code writing is closer,and the development cycle is shortened compared with the traditional method.This thesis explores the methodology of MBSE in practice.Compared with the traditional model,the model-centered approach makes the design process more concise,easy to understand and communicate;the model can be traced at all stages of the development process,and the problem of requirement changes can be solved;the model can be converted into code,reducing duplication of work,and the model design will replace most of the code writing work and become the core of system development,which improves the development efficiency and accuracy.This thesis is an useful exploration of the use of MBSE technology in the design of complex systems such as avionics systems for civil aircraft,which has some significance.