Tag Archive: process

Jun
20

Duty Cycle Control

As discussed in Chapter 11 of Control Loop Foundation – Batch and Continuous Processes, some field devices used in the process industryrequire that the control system provide a pulsed output interface. For example, in the plastics industry extruders are often used to process plastic pellets into various products. Plastic pellets are fed into the barrel …

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Jun
06

Addressing Difficult Dynamics, Process Interaction

Single-loop and multi-loop control may be used to address a wide variety of control requirements. However, if a process is characterized by extremely long process delays or by a high degree of process interaction, then other control techniques may be required. In Chapter 16 of Control Loop Foundation – Batch and Continuous Processes, pulp bleaching …

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Apr
18

Process Simulation – Part 5

The standard tools available in most process control systems may be used to create a dynamic process simulation. Such a simulation may be combined with the control modules to create an effective operator training system or to facilitate control system checkout. The techniques that may be used to create a dynamic process simulation and to …

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Jan
03

Process Characterization – Integrating Process

In some cases, a step change in a process input will result in the process output changing continuously. A process that exhibits such a response is known as an integrating process. As part of the chapter on process characterization in Chapter 9 of Control Loop Foundation, we address integrating process response. In the process industry, …

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Dec
27

Process Characterization – Inverse Process Response

Process characterization is the identification of the dynamic responses of a process to changes in its inputs. As part of the chapter on process characterization in Chapter 9 of Control Loop Foundation, we address inverse process response. A few processes exhibit a behavior where for a step change in input, the output initially changes in …

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Dec
20

Process Characterization – Self-regulating Process

Process characterization is the identification of the dynamic responses of a process to changes in its inputs. In Chapter 9 of Control Loop Foundation, we address process characterization. In some cases the process response may be characterized as a pure gain, lag, or deatime. However, many of the basic thermal and physical mechanisms reflected in …

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