Research And Development On Manufacturing Grid Workflow

Manufacturing Grid (MG) emerges as the result of combining the Grid technology with self-organization manufacturing system. MG provides a platform of resource sharing and cooperative work for the distributed and heterogeneous manufacturing resources. The tasks that the user submits to MG portal are carried out in a dynamic virtual organization. The business process of task is complicated since it includes many constraints on time, space and resources. In order to finish the task automatically or semi-automatically, it is important and urgent to adopt the workflow technology to build, schedule, monitor, and manage the business processes. The business processes can be automat and executed with high efficiency under management of the Manufacturing Grid Workflow (MGFlow).Subsequent to introducing MG and the workflow technology, and analyzing the research background of the MGFlow, the contents of the research are presented. The research of the MGFlow includes not only applying the traditional workflow technology to MG environment, but also the architecture, the model and executive processes of the MGFlow.The fundamental principles of MGFlow are studied. Through integrating the project management, workflow management and product data management, the process management for the product development is realized. Because of the complexity of virtual organization, resources and processes under MG environment, it is important to enhance the adaptability of MGFlow. Solving the adaptability of the MGFlow system is the emphasis of this research. The target strategy model of MGFlow is presented basiced on self-organization theory. In order to realize the resource matching, the MGFlow ontology is defined to build the integral and strict semantic.The concept of Manufacturing Grid (MG) and a new MGFlow system architecture is given by analyzing the characteristics of the MGFlow, extending the traditional workflow model and combining the Grid technology. The MGFlow system based Grid service provides the functions to manage the business processes, combine services, and integrate applications among enterprises. Then, the dissertation presents the relationship between the workflow module and other MG modules.The MGFlow model and the formalized definition of the model are presented. The MGFlow model provides the foundation to the implementation of the Manufacturing Grid workflow. The model includes process models, organization models, resource models, and service modes. We increase the dynamic execution type of activity in process model and introduce the synchronization cooperation activity definition which makes the process model meet the dynamic characteristics of Manufacturing Grid business processes. The organization model defines the relation among the workgroup, role, actor and authority in virtual organization. The resource model defines the type, the static properties and dynamic properties of manufacturing resources. The manufacturing resource is encapsulated to the manufacturing service by the service model. The service model masks effectively the isomerism of the resources. The algorism of time parameter and critical path in the process model is given for realizing the task schedule in running the process.In order to increase the adaptability in running the process of MGFlow system, three dynamic adjustment methods are adopted. To solve the dynamic and complexity of resources, according to the activity requirement, the resources are bound dynamically by semantic matching and selecting based on the Fuzzy Analytic Hierarchy Process in running process; To solve the scheduling problem of many tasks that are competing with each other for resources, we construct the task-resource constraint model and give the scheduling policy and heuristic scheduling algorithm. To solve the expectable exception and unexpectable exception in the running process, the exception handle strategy and method is presented.Finally, we develop and implement the MGFlow system. Its feasibility and rationality is validated by the product development process of endless screw component, and the experiences obtained from which are quite useful for further researches.