The Study Of Key Technologies Of Distributed Remote Service System Of Manufacturing Enterprises

This thesis is directed to study the key technologies of Distributed Remote Service System of manufacturing enterprise, focus on the operating mechanism, structure optimization, and architecture development of Distributed Remote Service System based on Customized Service-oriented Mechanism.Remote service system should be able to provide Product Full-life Cycle Service, which includes the whole stages from designing, manufacturing, marketing, selling, training, maintenance, fault diagnosis to recycling. Integration of all internal and external resources so as to carry out the "multi to multi" service mode for remote customers is very important to realize the product full-life cycle service. This integration of overall resources needs the distributed architecture in nature.Distributed remote service system based on customized service-oriented mechanism is a totally distributed architecture which can realize the "multi to multi" service mode for remote customers at ease. With the characteristics of multi-collaboration, self-adaptation, and ultra-agility, distributed remote service system based on customized service-oriented mechanism is a great revolution, compared with other traditional architectures of remote service.From the reference model of the full information system, the maximum information system and the minimum information system, the concept of "resource domain" was introduced by submerging the working nodes with similar attribute. Therefore the structure of remote service system diversifies from two-tier structure to three-tier structure: management nodes layer, resource domains layer, and working nodes layer. From a micro point of view, the three-tier structure can manage the working nodes in a proper, efficient and safe order. From a macro point of view, the three-tier structure can efficiently control the costs of system development, system operation, and system management by balancing the load of each modules of remote service system well.How to obtain more economic and social benefits from remote service system is a complex problem to its owned enterprise. As for the distributed remote service system based on service-customized mechanism, this problem can be deduced to: how to configure the structure of remote service system well, or in detail, how to figure out the right capacity of each resource domain. In a given resource domain, in one hand if the quantity of working nodes is too less, the response to customer in time can not be guaranteed; in the other hand if the quantity of working nodes is too much, good economy can not be achieved since more costs are paid for the redundant working nodes. Heuristic simulation and optimization method is introduced to solve this complex problem. Throughout the heuristic simulation and optimization procedure, optimization algorithm is the dominant factor, which triggers simulation procedures of resource domains, continuously adjusts the structure of resource domains, and outputs the right structure of resource domains of the distributed remote service system finally.Web Services technology is a useful tool to develop the distributed remote service system of CNC machine tool. The distributed remote service system of CNC machine tool based on Web services technology can ensure to realize the customized service-oriented mechanism, the fully distributed transaction processing function, and the loosely-coupled system structure. The components of distributed remote service system of CNC machine tool include Service Requesting Broker, Exclusive UDDI Registry, and Group of Resource Domains. Normally there are two ways for the customer of CNC machine tool to use the service resources of remote service system. In one way, the customer can visit the Web server of remote service system to submit processing tasks via internet browser; then the service requesting broker help to complete the whole task processing procedure and send the result back. In the other way, the customer can directly bind to the working nodes of resource domain by sending and receiving the SOAP messages and XML data to complete the submitted processing tasks by itself. Field data acquisition is a prerequisite for remote fault diagnosis. Therefore, the customer of CNC machine tool should at first build the information framework from the lower level of single CNC machine tool data acquisition system to the higher level of real-time monitoring and control system of machining production lines in a workshop. Deployment of web services server on this basis can offer the important function, which responds the outside requests of field data acquisition and completes the data transmission to requestor.Distributed remote service system is an essential pattern on the way of the development of remote service. Even if the architecture and the structure of distributed remote service system based on customized service-oriented mechanism are well presented in the thesis, lots of technical problems are remained unsolved due to the complexity of remote service operating mechanism.