Study On Crucial Technologies Of Multi-agent Based Integrateable Manufacturing Executive System

The manufacture in 21st century is in an ever-changing market that becomes more competitive every day and tends to be globalized, multi-directional and diversified. If an enterprise wants to be invincible in the brutal competition, it has to be capable of quickly adjusting itself to the changing environment and capable of innovation, that is, to be sensitive. As the bridge connecting the planning & managing layer and the facility control layer, the Manufacturing Executive System is the key factor to raise an enterprise's sensitivity. Aiming at the disadvantages and drawbacks of the traditional Manufacturing Executive System in the agile environment, A Integralablc Manufacturing Executive System (I-MES) that is open, integratable, dynamic, agile and opcralable is established based on the multi-agent technologies. An extensive study on the system's crucial technologies is carried out as well.Taking the dispersed manufacture enterprise as the background, An Integratable Manufacturing Executive System functional model for the agile manufacturing environment is proposed, which provides grounds for designing and realizing the control architecture of the I-MES that is based on the Multi-agent technology. On top of the analysis of the characteristics of the existing control architectures in the manufacturing enterprises, a hybrid hierarchical distributed control architecture that is based on ihc multi-agent technology is provided. Meanwhile the general structure for manufacturing agent and the flow chart of the agent are described. A tri-layer structure model of the I-MES based on Windows DNA is provided and the integration mechanism of the I-MES and ERP system and facility control system is discussed in this thesis.According to the generalization of the current manufacturing system modeling methods and aiming at the characteristics of UML and Petri net modeling, an UML-PNs integrated modeling method is established. The integrated modeling strategies with the UML to Petri net mapping rules are described as well. Using a demonstration system, the UML-PNs modeling process is described detailly and the use case diagrams, object class graphs, interaction graphs and action graphs and the petri network model of I-MES are provided.The domestic and foreign research status of job-shop scheduling technologies is analyzed. Following the process type Multi-agent Scheduling Strategy (MASS), a Genetic Algorithm that is to solve the static and dynamic job-shop scheduling problems is designed which is sealed into scheduling agent .The jobshop scheduling is fulfilled through theinteraction of the agents. The definite structure of scheduling agent is described and the validity of Genetic Algorithm is proved by a standard 6 6 dispatch problem.In an attempt to tackle the most common resource conflict problem of I-MES, a conflict resolution model that is based on multi-agent cooperation is proposed. From the perspective of conflict management full life circle, the problems of conflict checking, conflict analysis and conflict resolution are studied extensively. Meanwhile a conflict analysis method based on Program Evaluation an Review Technique/Critical Path Method (PERT/CPM) is provided, which categorizes all kinds of resource conflict. Furthermore the corresponding conflict resolution strategies and conflict resolution rules based on KQML are also discussed in this thesis.The negotiation mechanism and communication mechanism between the agents in I-MES are discussed. Taking the scheduling problem for example, the structure, format and content of the transferred information between the agent are also studied.