Research On Process Mining And Configuration Method Of Typical Parts On Satellite

Mechanical structure, as an important component of satellite platform, has the function of supporting other subsystems and payload. Satellite plate, c enter bearing cylinder, box parts and et al. are all the typical parts/components to compose the satellite mechanical structure. According to the actual production of satellite manufacturing factory in our country, the production ability has become the key factor of improving the rapid response ability of satellite manufacturing factory. With the serialization and platformization development of satellite, the typical parts/components also present the characteristics of similarity and serialization in structure gradually. The typical processes are discoveried and typical proce sses database are created by summarizing the existing manufacturing processes of typical parts/components and concluding the similarity of manufacturing processes for the same type of typical parts/components in different satellites. Based on the typical process database, the process of typical parts/components can be configured quickly. These have important theoretical significance and practical application value in realizing the standardization of typical parts/components process and improving the rapid response ability of satellite manufacturing factory. And also these are main research contents and desirable research goal of this thesis.In mass customization, product family and configuration technique play an important role in the product design phase, however, the definition of process family and the configuration technique used in process design phase have only in their infancy. Regard of this, the concept of process family is extended first, and then the concept of generalized process family concept is proposed. The connotation of generalized process family includes three aspects: general process feature, process knowledge and general process structure. The architecture of generalized process family is built based on process platform. In order to ensure the transmission and sharing of process family information between each system, the UML is adopted to build the process family and the XML is adopted to express the process family information model.In order to establish the perfect generalized process family for satellite typical parts/components, process knowledge and general process structure should be discoveried from the process data of satellite typical parts/components. Because the typical processes sequence and decision making rules of process which are always used in process design can be represented by association rules, the classical Apriori algorithm for association rule mining can be used to mine these two types of process knowledge. The Apriori algorithm is low efficiency when the data is hug e, in order to deal improve the efficiency of knowledge mining, binary particle swarm optimization algorithm is adopted to conduct the process data to get the min support and min confidence for association rule mining. The instances of mining typical processes sequence mining for forming process of satellite plate and decision making rules for pipe welding process of satellite verify the validity of the algorithm. The discoveried typical processes sequence and decision making rules laid a solid foundation for the perfection of process knowledge in generalized process family of satellite typical parts/components. Process data are always existed in the form of unstructured natural language which can be used directly. In this situation, attributed directed graph is used to represent the process. Based on the process attributed directed graph model, the calculation methods of similarity between processes are studied. For the process clustering has the character of unknown clustering number, a semi-supervised clustering algorithm based on t Affinity Propagation is studied to cluster the typical process. And Silhouette index and IGP index are adopted to evaluation the clustering results. At last, the typical machining processes for satellite plate panel are clustered. Because the general process structure are always expressed as process routes and the discoveried typical processes are representative, the route of typical process can be used as the general process structure.For the purpose of dealing with the problems of low efficiency of process planning and low reuse of process knowledge, configuration technique is used in process planning. For the intermediate variables or constraints may occur in process planning, the generative constraint satisfaction problem is adopted to solve the process configuration. The solving algorithm based on backtracking for process configuration is studied. Applying this method in machining process configuration for satellite plate panel, and several process configuration schemes can b e obtained. In order to gain the optimal process scheme, reuse index and validity index are proposed to evaluate the process configuration schemes. With these two indexes the tradeoff evaluation of process configuration schemes can be realized.Lastly, the satellite typical parts/components in Beijing satellite manufacturing factory are taken as instances to discuss the application of related technique. With the actual demand of process design department, the process configuration system for satellite typical parts/components is developed based on Siemens UG NX 8.0 and Web. The construction of the system architecture is discussed in detail, and the design of information and main functional modules are introduced. With the instances, the application of the system is analyzed.