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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
71

Active statistical process control

Ibrahim, Kamarul Asri January 1989 (has links)
Most Statistical Process Control (SPC) research has focused on the development of charting techniques for process monitoring. Unfortunately, little attention has been paid to the importance of bringing the process in control automatically via these charting techniques. This thesis shows that by drawing upon concepts from Automatic Process Control (APC), it is possible to devise schemes whereby the process is monitored and automatically controlled via SPC procedures. It is shown that Partial Correlation Analysis (PCorrA) or Principal Component Analysis (PCA) can be used to determine the variables that have to be monitored and manipulated as well as the corresponding control laws. We call this proposed procedure Active SPC and the capabilities of various strategies that arise are demonstrated by application to a simulated reaction process. Reactor product concentration was controlled using different manipulated input configurations e.g. manipulating all input variables, manipulating only two input variables, and manipulating only a single input variable. The last two manipulating schemes consider the cases when all input variables can be measured on-line but not all can be manipulated on-line. Different types of control charts are also tested with the new Active SPC method e.g. Shewhart chart with action limits; Shewhart chart with action and warning limits for individual observations, and lastly the Exponentially Weighted Moving Average control chart. The effects of calculating control limits on-line to accommodate possible changes in process characteristics were also studied. The results indicate that the use of the Exponentially Weighted Moving Average control chart, with limits calculated using Partial Correlations, showed the best promise for further development. It is also shown that this particular combination could provide better performance than the common Proportional Integral (PI) controller when manipulations incur costs.
72

Subspace identification methods for process dynamic modeling /

Shi, Ruijie. January 2001 (has links)
Thesis (Ph.D.) -- McMaster University, 2001. / Includes bibliographical references. Also available via World Wide Web.
73

Statistical validation in process capability for a high pressure flexible polyurethane foam pouring machine

Ketter, Kevin M. January 2007 (has links) (PDF)
Thesis PlanB (M.S.)--University of Wisconsin--Stout, 2007. / Includes bibliographical references.
74

Decision mechanism, knowledge representation, and software architecture for an intelligent control system /

Malaviya, Anoop Kumar. January 1997 (has links)
Thesis (Ph. D.)--University of Western Australia, 1998.
75

The development of systematic controllability assessment for process control designs /

Ekawati, Estiyanti. January 2003 (has links)
Thesis (Ph.D.) --Murdoch University, 2003. / Thesis submitted to the Division of Science and Engineering. Includes bibliographical references.
76

Integration of operational tasks in chemical plants /

Nikraz, Magid. January 2007 (has links)
Thesis (Ph.D.)--Murdoch University, 2007. / Thesis submitted to the Division of Science and Engineering. Bibliography: p. 471-483.
77

Nonlinear fault detection and diagnosis using kernel based techniques applied to a pilot distillation column

Phillpotts, David. January 2007 (has links)
Thesis (M.Eng.(Chemical Engineering))--Universiteit van Pretoria, 2007. / Abstract in English. Includes bibliographical references.
78

Performance monitoring of run-to-run control systems used in semiconductor manufacturing

Prabhu, Amogh V., January 1900 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 2008. / Vita. Includes bibliographical references.
79

Model-based framework for integrated simulation, optimisation and control of process systems

Rolandi, Pablo Adrián. January 2004 (has links)
Thesis (Ph. D.)--Dept. of Chemical Engineering, Graduate School of Engineering, University of Sydney, 2005. / Bibliography: leaves [327]-333. Also available in print form.
80

Real-time optimization of semi-batch reactors

Vemuri, Yagna Jyothy. Palanki, Srinivas. January 2004 (has links)
Thesis (Ph. D.)--Florida State University, 2004. / Advisor: Dr. Srinivas Palanki, Florida State University, College of Engineering, Dept. of Chemical Engineering. Title and description from dissertation home page (viewed Oct. 06, 2004). Includes bibliographical references.

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