Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 518 for “"process control"”.
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Tools for Autonomous Process Control
… ongoing trend towards higher automation level in process control systems. The purpose of a plant is to manufacture some product at a high production rate with a consistent quality, while minimizing the use of resources in terms of energy consumption, raw material and labor. With a higher degree of …
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Run by run process control
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1991.
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Nonparametric procedures for process control
Three nonparametric control chart procedures are developed. The procedures are designed to detect any shift in the median of a sequence of observations from a specified control value. The first two procedures require that groups of g ≥ 1 observations be made sequentially on the output of the …
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Statistical process control by quantile approach.
Most quality control and quality improvement procedures involve making assumptions about the distributional form of data it uses; usually that the data is normally distributed. It is common place to find processes that generate data which is non-normally distributed, e.g. Weibull, logistic or …
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SLURRY ATOMISATION SYSTEM FOR PROCESS CONTROL
The mechanistic processes of slurry atomisation - Direct Current Plasma - Atomic Emission Spectroscopy (DCP-AES) were investigated using excitation temperature (Texc) measurements , simplex optimisation, particle transport experiments and computerised tomography .
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Statistical process control of stationary processes
… between optimal EWMAST and optimal ARMAST control charts. The optimal EWMAST control chart is adequate when u is not high positive with small mean shift.
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Human Problem Solving in Process Control
A review of literature from the domain of process control is provided, in which the complexity of the process control task is illustrated. It is argued that the role of the human operator is evolving to be primarily that of a problem solver. Following a brief review of literature related to problem …
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Disciplined agility for process control & automation
Process automation vendors must consider agility as a basis to gain a competitive edge in innovation. Process Automation systems can impact the operating cost of manufacturing equipment, the safe control of large quantities of energy and the safety of dangerous substances used during manufacturing. …
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Process control: a dynamic programming approach
In this thesis, a cost based process control model is formulated. A dynamic programming approach is used and along with the techniques of Bayesian decision theory, an optimal set of steady state control policies are shown to exist which are dependent upon prior beliefs about the condition of the …
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SIMULTANEOUS APPLICATION OF MULTIPLE PROCESS CONTROL RULES
<p>Statistical Process Control (SPC) charts are tools used in quality control to monitor and analyze the stability of a process over time. This study evaluates the effectiveness of eight individual Western Electric rules, also known as WECO rules, and the various combinations of these rules with …
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Viscosity Measurements for Milk Powder Process Control
… use of viscosity measurement for milk powder process control and how the understanding of the dynamic of viscosity measurement can benefit the process. To achieve this goal, this study used the fundamentals of rheology, system identification, and a variety of viscosity measurement technologies …
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A synthesis of quality and process control
An improved quality control model is suggested in this thesis. The improved quality control model is derived by treating the quality control problem as a process control problem. The quality control model is developed by formulating a process control model in terms of product quality parameters and …
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Statistical process control performance characterization under field conditions
Performance characterization of SPC technology is necessary in order to assess the impact of potential SPC strategies and actions. In this research a simulation-based tool (SPClab) is defined, designed and developed that can be used to study SPC options and its performance characteristics, …
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Digital control system programming from process control diagrams
A graphical process control language has been developed as a means of defining process control software. The user configures a block diagram describing the required control system, from a menu of functional blocks, using a graphics software system with graphics terminal. Additions may be made to …
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Emulating human process control functions with neural networks
… neural networks can perform some of the tasks in controlling complex systems that have been traditionally reserved for humans. Neural networks can be used to fuse different types of knowledge from many sources into a general process model. This technique allows process models to be formed for …
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An Investigation of Multivariate Process Control for Biomanufacturing
… through single loop univariate or cascaded controls - technology that has not fundamentally changed in decades. Outside of biomanufacturing, process control technologies have advanced to include multivariate and predictive control. This project examines the feasibility of developing a …
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Bioreactor Fill Process Control Using Inline Concentration Measurement
… step is desirable, because it: (1) enables process optimization, including potential throughput expansion, (2) demonstrates control over the process, and (3) improves step yield reproducibility. The technical and economic bases for the implementation of an alternative process control …
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