Investigation of dynamic matrix control
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"Applying digital computers to process control has developed rapidly since the late 1950’s. One way of using computers in process control is by direct digital control (DDC). In DDC the computer completely replaces the analog controller, utilizing the information about process variables to keep the process under direct control. The logical decisions made by the computer are based on a sequence of logical steps, called an algorithm, designed by the control engineer. The Dynamic Matrix Control (DMC) Algorithm (Culter and Ramaker, 1979) is a direct digital control technology that has been used by Shell Oil Company since 1973. As it is implied by its name, the whole notion of the DMC Algorithm is based on representing the system dynamics by a set of numbers arranged in vectors and matrices. Including the system dynamics in the design of DMC has helped maintaining awareness of deadtime and other unusual dynamic behavior. Some complex control problems, which can not be treated satisfactorily with traditional proportional integral-derivative (PID) techniques, can be solved using a digital computer with logic in the control loop. The DMC Algorithm is discussed in this thesis. The discussion will interpret DMC in terms of a combination of feedforward and feedback essentially unconstrained control of multivariable systems with multiple delays or deadtimes. The application of DMC to two example systems, namely, a distillation column and a gas absorber is also included for the purpose of illustration. Both of the systems were used by other authors to test the capabilities of control algorithms."--Introduction.
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