Research On Collaborative Manufacturing Execution System Based On Ubiquitous Computing

As the bridge connecting the planning&managing layer and the facility control layer, Manufacturing Executive System (MES) plays an important role in manufactural enterprises. However, within the current complicated manufacturing environment, to meet the individualized and diverse demand, companies have to change their production to multi-specification and small-batch and customized mode. In this condition, the deviation between Production Logistics and Information Flow shows up:the means of information collection, dissemination and visualization fall behind the production management demand; the feedback information can't fulfill the need of management decision-making in real-time with dynamic data reflecting overall production process. Aims at improve the efficiency in the data collection and application, also lays a stronger emphasis on abilities of integration, collaboration and reconfiguration this dissertation constructed the system model of collaborative manufacturing execution system based on ubiquitous computing.First of all, to realize the collaboration of production logistic and information flow, according to the theory of fusing physical space and information space, the follows problem should be resolved:First, the dynamic information exchange platform should be constructed, which is not only including the static entity like material and personnel but also reflecting the real-time state and changes of equipment, material, semi-finished product and order in production process. Second, system could collect overall information from the production field and other information system, and realize share and dissemination of data through efficient ways, to satisfy the demand of production management and control. For the first problem, based on analyse of production logistic, combining the ontology method, a dynamic hierarchical data model was proposed. The static design ontology is used for data exchange and share and the business running ontology is used to reflect and record the production process.To resolve the second problem, the technology of automatic identification, implicit interaction and wireless net access technology were introduced, to improve the automatic level, data range and efficiency of data collection, transfer and processing. Also, the event model and interface model of heterogeneous distributed information of multi-sources were constructed, to support the realization of rationalization, instantaneous, convenience and benefit of production. Then, the context-wawre applications under ubiquitous environment were introduced to solve the problems of the data conversion from the plant to business (P2B), data transform and data transmission. To generate high level context and assure the consistency and accuracy of context, which is presented by ontology, several business rules were proposed to support context reasoning. For example, the fuzzy reasoning methods based on rough set used in quality management was discussed.Finally, an enterprise application platform based on ubiquitous computing was studied; a prototype of Ubiquitous Computing module of collaborative MES was presented as well. An application example was provided that verifies the feasibility of approaches to develop Manufacturing Executive System based on Ubiquitous Computing.