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 15 of 15 for “"Process Control Systems"”.
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Development of real-time process control systems using formal techniques
A major application of computers has been to control physical processes in which the computer is embedded within some large physical process and is required to control concurrent physical processes. The main difficulty with these systems is their event-driven characteristics, which complicate their …
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The Development of Hybrid Process Control Systems For Fluidized Bed Pellet Coating Processes
<p>The conventional basic control for pharmaceutical batch processes has several drawbacks. The basic control often uses constant process settings discovered by trial and error. The rigid process operation provides limited process understanding and forgoes the opportunities of process optimization. …
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Pseudo-concurrent programming for real-time process control applications
… system maintenance of real-time, industrial process control systems is presented. The monitor is written in PLM86 for use in an Intel 8086 based system in which system software is organized into a set of foreground interrupts and an infinite background loop. The monitor, which resides in the …
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Physical Layer Fault Tolerance for Foundation Fieldbus Network
… Fieldbus offers a wide range of benefits to process control systems through data reliability, diagnostics, interoperability, and distribution of controls to an unprecedented level. However, lack of media redundancy on its H1 networks can compromise the availability of view and control of a …
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Control signal transmission through power supply cables of a 3-phase PWM motor
Modem process control systems often employ accurate position or speed controlled PWM motors, which require feedback data for the drive control loop. Current methods require an independently shielded cable for feedback data transmission. This is due to the fact that high-voltage PWM signals could …
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The Early Assessment of System Performance in Distributed Real-time Systems
Distributed real-time process control systems are notoriously difficult to develop. They frequently overrun time schedules and break cost constraints. The problems are compounded where there are multiple development teams and stakeholders. Conventional model-driven development has been examined to …
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The Impact of Instrumentation Location and Reliability on the Performance of Operators Using an Ecological Interface for Process Control
… simulation representative of industrial process control systems. The results of this research were the following. First, the Abstraction Hierarchy was uniquely extended to indicate instrumentation requirements to support human-machine interfaces. Second, an original EID interface was …
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Designing Massive 3-Dimensional Neural Networks with Chromosomal-Based Simulated Development
… and optimizing the next generation of smart process controllers has been developed in this dissertation. The literature review indicated that neural networks held the most promise for this application, yet fundamental limitations have prevented their introduction to commercial settings thus …
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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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Trustworthy Embedded Computing for Cyber-Physical Control
A cyber-physical controller (CPC) uses computing to control a physical process. Example CPCs can be found in self-driving automobiles, unmanned aerial vehicles, and other autonomous systems. They are also used in large-scale industrial control systems (ICSs) manufacturing and utility …
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Architectural Enhancements to Increase Trust in Cyber-Physical Systems Containing Untrusted Software and Hardware
… are widely employed in cyber-physical systems (CPSes), which tightly integrate and coordinate computational and physical elements. CPSes are extensively deployed in security-critical applications and nationwide infrastructure. Perimeter security approaches to preventing malware …
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Time-delay systems : stability, sliding mode control and state estimation
… disturbances are unavoidable in many practical control systems such as robotic manipulators, aircraft, manufacturing and process control systems and it is often a source of instability or oscillation. This thesis is concerned with the stability, sliding mode control and state estimation problems …
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A Trusted Autonomic Architecture to Safeguard Cyber-Physical Control Leaf Nodes and Protect Process Integrity
Cyber-physical systems are networked through IT infrastructure and susceptible to malware. Threats targeting process control are much more safety-critical than traditional computing systems since they jeopardize the integrity of physical infrastructure. Existing defence mechanisms address security …
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Novel Reactors for Biological Treatment of High Strength Nitrogen and Carbon Wastewater
… the performance of three different biological systems to achieve near full nitrogen (N) and carbon (C) removal from high-strength N wastewaters with low C/N ratio. The first objective was to demonstrate long-term operation of a simple two-stage partial nitrification-anammox reactor treating …