Method and apparatus for statistical process control of machines

Details Method and apparatus for statistical process control of machines Method and apparatus for statistical process control of machines

1998-04-30

1999-11-16

Barlow, John

Data processing: measuring, calibrating, or testing

Measurement system

Statistical measurement

702 81, 702182, 3641486, G06F 1700

Patent

active

059873981

ABSTRACT:
A method and apparatus for analyzing a process or machine having a non-constant mean of a response variable using statistical process control techniques. Several measurements of a response variable are taken while the monitored machine is known to be operating in control. Through statistical regression techniques, a mathematical formula is derived to predict the value using indicator variables at various periods in the process. Then, while the process or machine is operating on an ongoing basis, actual measurements of the response variable are taken and compared to the predicted values using indicator variables calculated from the derived formula. Statistical process control rules are applied to the measured values of the response variable and the predicted value using indicator variables to determine if the machine or process has fallen out of control.

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