Development Of An Attitude And Guidance Control Knowledge Management System For Launch Vehicle Based On Ontology

In this thesis,we study the methodology of representing,managing and reusing the knowledge in the design of the attitude and guidance control system of launch vehicles.Based on the ontology model of the knowledge in the design of attitude and guidance control system of launch vehicles,and also combined with the frequency domain analysis,attitude controller design and guidance controller design,which are very necessary during the development process of launch vehicles,an attitude and guidance control knowledge management system for launch vehicles based on ontology is designed.The main work of this thesis is as follows:1.A detailed requirement analysis and the function design for this knowledge management system are conducted.Based on that,a detailed description of the development of every module is given.There are four main modules: ontology knowledge interpretation module,frequency domain analysis module,attitude controller design module,and guidance controller design module.We also give a short introduction for how to collect the knowledge about the attitude and guidance control systems of launch vehicles and build their ontology models.According to those,by using the SSH2(Spring+Struts2+Hibernate)integrated development framework under the B/S(Browser/Server)architecture,a solution of developing an attitude and guidance control knowledge management system for launch vehicles based on ontology and J2 EE platform is proposed.2.The key technologies and tools that are used for developing the system are introduced.First of all,the advantage of SSH2 framework is introduced.Next,some interaction technologies between various programming languages are discussed,including J2 EE,mixed programming between Java and Owl,mixed programming between Java and Matlab,and so on.At last,we give a detailed design for the data management system.3.Detailed description of each module's implementation in the attitude and guidancecontrol knowledge management system for launch vehicle based on ontology is given.By using the mixed programming between Java and Owl,the ontology knowledge interpretation module completes knowledge searching in the owl file.In order to reduce the degree of coupling between layers(the view layer,the control layer and the model layer),expand system conveniently and decrease the workload of maintenance,the SSH2(Spring+Structs2+Hibernate)integration framework is used in the frequency domain analysis module,the attitude controller design module and the guidance controller design module,and also those modules using mixed programming between Java and Matlab.As the same time,through the test of each model,the system runs normally and stably.The users can log on to the system for operation on PCs.The system has a good application value for its complete function modules,high stability,good user interface and other features.