Evaluating variation reduction process control strategies through system modeling

Abstract

This paper presents a method for using a system model to reduce end-of-line variation in a sheet stretch-forming manufacturing system. An integrated set of mathematical models representing the operations in a system can be effectively used to select among four variation reduction strategies: robust process design, input variation reduction, feed-forward control, and feedback control. To compare these alternatives, models that predict both quality characteristic nominal values and standard deviations of the work-in-process are required. Numerical simulation using these models allows for evaluation and comparison of each strategy prior to any activity on the shop floor. This approach is demons..