Yan Cao

Multi-layer Intelligent Encapsulation of Manufacturing Resources for MAS-based Distributed Manufacturing System

In order to deal with dynamic change in a manufacturing environment, all kinds of manufacturing resources are reorganized as multifarious agents with different resources and capability. According to the automation level and working mode of each functional agent to finish its tasks in the manufacturing environment, the manufacturing resource agents are divided into three categories. In order to construct these various agents conveniently, a multi-layer structure is put forward. Based on the structure, the agents can not only rapidly deal with unexpected events, but also recognize and predict the environment change automatically to adjust their behavior. A manufacturing system hierarchical architecture based on MAS is also provided. According to the change of actual productive tasks and the difference of scheduling strategies, the manufacturing system can be reconstructed flexibly by changing the MAS structure and the granularity of the agents. Consequently, it can adapt to the rapid change of the manufacturing environment and the manufacturing resources.

MES Scheduling Optimization and Simulation Based on CAPP/PPC Integration

Confronted with the complexity of manufacturing environment, manufacture system, and manufacturing process, how to abase this complexity is an important problem to realize production scheduling and control effectively. Thereinto, CAPP and PPC are two main modules involved in production activities. Firstly, the existing approaches of CAPP/PPC integration are analyzed. Then, a conceptual model for concurrent distributed integration of CAPP and PPC is presented. The model can achieve the integration of CAPP and PPC and solve the production planning and control in a virtual enterprise. According to the conceptual model of the functional integration of CAPP/PPC, a method to realize the functional integration of CAPP/PPC is discussed. And then, according to the requirements of single piece and small batch production, MES scheduling optimization can be realized based on CAPP/PPC Integration. The structure of the scheduling sub-system of MES is also presented that is consisted of three core modules, namely operation planning, operation scheduling, and material tracing module. Finally, based on Witness, a simulation model of a specific workshop is established. Through the comparison of scheduling schemes, the optimal MES scheduling scheme is obtained.

Distributed Cooperative Design System Development Based on XML and J2EE Platform

To realize distributed cooperative product design in virtual enterprises and supply chains, an extended MVC-based Web application framework based on XML on J2EE platform is put forward that is more flexible, expansible and maintainable. An integrated information framework for loosely coupling software modules based on uniform XML data model is also presented to change the confused situation that comes from connecting isolated data sources. On the basis of the MVC-based extended Web application framework, the architecture of a machine tool distributed cooperative design system for virtual enterprises is presented. The system includes the modules of requirement analysis, scheme decision-making, project management, task decomposition, process monitor, resource management, user management, and collaborative tool management. A machine tool distributed cooperative design system is developed to validate the extended MVC-based Web application framework and XML interoperable information model.

Three-Dimensional Standard Part Library Development Based on Pro/TOOLKIT and Database

Pro/TOOLKIT and FamilyTable provided by Pro/ENGINEER and Visual C++6.0 are utilized to develop three-dimensional standard part library of riveting joint according to national riveting joint standards. Feature based modeling and FamilyTable are used to construct three-dimensional riveting joint part library. The interface between Pro/ENGINEER and MFC is developed using DLLs to establish a man-machine interface that accords with engineering personnel’s habit. This breaks through the limitation of Pro/TOOLKIT. According to the newest Machinery Design Handbook, Microsoft Access databases of various rivets and rivet nuts are established, and the interface between Pro/ENGINEER and the Access databases is developed to call the data in the Access databases from Pro/ENGINEER. The library is intuitionistic and easy to use. Consequently, tediously repetitive work can be reduced, and product design efficiency and quality can be improved. The approach can also be applied to develop other more professional part libraries in special domains.

Dynamic Scheduling and Control System Based on Multi-layer Mixed Construction of Manufacturing Resource Agents

Faced with processing time uncertainties, equipment reliability/availability, demand changes, manpower fluctuation and so on in a dynamic manufacturing environment, an organization structure for agile production scheduling and control based on MAS is put forward to achieve effective and efficient production. A hybrid multi-layer agent structure is put forward to facilitate constructing various agents. Bidding mechanism is adopted to decompose and assign manufacturing tasks that determine the cooperative relationship among agents at different levels. The integration of task assignment and scheduling is realized through capability matching and dynamic scheduling. Agent granularity and MAS model are determined dynamically according to production demands. Consequently, all resources in a manufacturing system are reorganized into an agile manufacturing network of agents to collaboratively plan, control and manage distributed production by exploiting the autonomous and cooperative characteristics of various agents.

EPR Management System Development Based on B/S Architecture

As electronic patient record (EPR) is the basis of clinical information and the core of a hospital information system (HIS), the research on EPR is an important element of HIS and digital hospital construction. Based on B/S architecture, a three-layer EPR management system is presented. Its expandable, maintainable and secure B/S system architecture is cost-effective and is developed with Eclipse platform. The dataflow and activities at a hospital are analyzed. Based on the function and operation analysis of the clinical department in a hospital, the database structure for the EPR management system is designed using E-R charts. The functioning process of the server in the B/S architecture is discussed. The server is developed with the components registered in Struts-config.xml file. At the client, JSP pages are created with dreamweaver. The prototype system is tested by test run and its correctness is validated.

Weight coefficient cluster covering genetic algorithm for multi-objective optimization based on accurate and fuzzy decoding

A novel weight coefficient cluster covering genetic algorithm for multi-objective optimization and its implementation based on Delphi 7.0 are discussed. First, the principle and key technologies of the algorithm are presented, including cluster covering, accurate decoding and fuzzy decoding, etc. Then, its workflow is analyzed. Its main modules include input module, computing module, output module, and operational module. Its operational process is illustrated. The influence of algorithm parameters on computing results is also analyzed. The results show that the algorithm is validated. The algorithm can adopt several computing patterns. Both accurate decoding and fuzzy decoding have good astringency and diversity distribution. It is easy to use and its visualized result analyzing sub-system can output both data and graphs. The alternative employment of accurate decoding and fuzzy decoding can further improve its performance. These instructions give you basic guidelines for preparing papers for conference proceedings.

CAD Compositive Capability Cultivation of College Students in Engineering Practice

How to improve students’ CAD compositive capability at their collegial stage is a very important problem. However, it is hard for colleges and universities to afford the environment that is completely oriented to engineering practice and to provide various training opportunities for the students. Based on the research and exploration in the past years, research projects are used to drive teaching innovation in the paper. Research contents, objective, problems to be solved and approach adopted are presented. Research scheme and guarantee measures are also explained. Taking the development of Common Rolling Bearing Digital Three-Dimensional Model Library for example, the approach is discussed in detail.

Outspread Sheet Metal Algorithm of Oblique Square Dome Pipe Considering Thickness

In order to resolve inaccuracy and low efficiency problem for sheet metal outspread, a new sheet metal outspread method is proposed for oblique square dome shaped pipe. Three dimensional model oblique square dome pipe sheets is firstly constructed and unfolding function is realized in VC++ 6.0. In addition, thickness disposal and unfolding mathematic model are also discussed. Lastly, oblique square dome shaped pipe unfolding method is introduced in detail by taking for an instance, and it shows that the auto unfolding method was effective on sheet metal of oblique square dome shaped pipe unfolding.

Machining Parameter Optimal Selection for Blades of Aviation Engine Based on CBR and Database

Blades of aviation engine are usually composed of complex three dimensional twisted surfaces that request high geometrical precision. Their machining is very difficult. Hence, how to reuse successful machining technics becomes an important and effective measure to improve blade machining quality. Machining parameter optimization for blades of aviation engine based on CBR and database is discussed in the paper. The system architecture and workflow are presented. Machining parameter database based on CBR consists of a case library and a machining database. Both of them can not only run independently, but also be integrated through application interface. Case representation includes two aspects, namely problem and objective description and solution scheme. Similarity ratio calculation is divided into local similarity ratio and integral similarity ratio. Through system development, it is proven to be feasible that machining parameter optimal selection is realized based on CBR and database.