Information Modeling for Computerized Manufacturing

Abstract

A key problem facing computerized manufacturing is information integration in the facility, which is characterized by heterogeneous distributed systems including manufacturing resources planning(i.e., MRP II), product/process design (i.e., CAD and CAPP), shop floor control and manufacturing cell control (i.e., CAM). This integration problem is highly complex for existing distributed database technology. New methods are needed to simplify the complexity and facilitate the task of global modeling, thereby achieving integration. An information modeling and design approach using a metadatabase framework and a two-stage entity-relationship (TSER) methodology to address the system integration problem is presented. The metadatabase framework is a simplification design entailing a federated system architecture, an integrative information model, and a knowledge-based control methodology. The TSER methodology, used for the information model, features both a semantic modeling construct encompassing the US Air Force's IDEF approach, and operational modeling construct for consolidating data structures across the manufacturing facility. Preliminary results of a pilot study, including both modeling and software system development, are included to illustrated the theoretical work.