Graduate Thesis Or Dissertation
 

Design and implementation of a flexible manufacturing cell with real-time statistical process control capabilities

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/cj82kc00s

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  • A modem Flexible Manufacturing Cell (FMC) usually consists of several Distributed Control Systems (DCS). Modeling and evaluating a manufacturing integrated system and then translating the models to operational programs are important steps in implementing a FMC. Monitoring and enhancing a FMC's manufacturing process quality is another critical issue. An embedded real-time Statistical Process Control (SPC) system can substantially reduce the delay between the occurrence and detection of an out-of-control condition during manufacturing, thus resulting in consistently high quality products. This research develops a modeling framework for integrating the operation of FMCs with realtime SPC capabilities. This is accomplished in four phases: (1) specifying FMC's physical components, and process and functional requirements, (2) designing FMC's integrated manufacturing process and control system for individual DCSs, (3) evaluating the system design, and (4) implementing the system design. Tools used in the modeling and evaluation phases include the Scenario Integration Tables and Petri nets. A flexible communication interface for control computer and associated DCSs has been designed to implement this system framework. The X and R charts are used for real-time SPC operation of the FMC. An efficient algorithm is designed for the real-time SPC check using a finite state representation; this algorithm is then implemented using an object-oriented model.
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