Online statistical process control with NDE and computers
[title]:Online statistical process control with NDE and computers
[Subject]:QC;statistical process control;NDE;computers;(SPC);ultrasonic instruments;nondestructive evaluation;Monte Carlo simulation;online operation;process computer control;statistical process control;ultrasonic materials testing
[Corporate Source]:Center for Nondestructive Evaluation;Iowa State Univ.;Ames;IA;USA
[Publisher]:Ultrasonics Symposium;1988. Proceedings.;IEEE 1988
[ISSN]:
[ConferenceDate]:2-5 Oct. 1988[Publish Date]:1988[Total Page]:2 vol. 1113[Pdf size]:332K[On Pages]:523_527 vol.1
[From]: School Papers schoolpapers.org
[Download]:Online statistical process control with NDE and computers
[Abstract]:It is shown that, for statistical process control (SPC) using ultrasonic instruments for nondestructive evaluation (NDE) directly interfaced with a computer, a variable in every part can be measured at production line speeds and used in groups, typically of five, to generate points for control charts. The process control computer can then analyze the control chart (held in its memory and updated in real-time) to indicate out-of-control conditions. An indication can be produced in the time to manufacture from 5 to 40 parts, not in hours as with manual SPC. The computerized speed cannot be used directly because the statistics of control charts yields Type I errors (calling good production bad) of 1 % probability per control chart point. However, an algorithm has been developed yielding an error probability of three parts in 100000. The algorithm is based on a Monte Carlo study of the statistics of control chart run rules. The Monte Carlo simulation is presented.
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