Abstract
In the production of chemicals, a process adjustment such as feedback control is frequently used to reduce process variability. It is very important to judge whether or not the adjustment should be done automatically because an automatic process control (APC) system requires a large capital investment. This paper presents the determination of the adjustment timing on the basis of the process capability, and control charts combining information about the state of statistical control and process capability are also presented for the judgment of adjustment timing. Practitioners can assess both the adjustment interval and the number of adjustments by simulation or trial using the presented method. Moreover, the information is very useful for judging whether or not the automatic adjustment system should be introduced.
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Acknowledgements
This work was supported by KAKENHI (22710151). The authors acknowledge the Renesas Electronics Corporation Group for their constructive comments and provision of data.
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Kawamura, H., Nishina, K., Suzuki, T. (2012). Process Adjustment Control Chart for Simultaneous Monitoring of Process Capability and State of Statistical Control. In: Lenz, HJ., Schmid, W., Wilrich, PT. (eds) Frontiers in Statistical Quality Control 10. Frontiers in Statistical Quality Control, vol 10. Physica, Heidelberg. https://doi.org/10.1007/978-3-7908-2846-7_9
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DOI: https://doi.org/10.1007/978-3-7908-2846-7_9
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