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SunCam: Online Continuing Education Classes
By: Raymond L. Barrett, Jr., PhD, PE
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This continuing education course is written specifically for professional engineers with the objective of relating to and enhancing the practice of engineering.
This course covers the methodology for developing a digital controller using a modern digital controls approach. Model development for both analog and digital representations are shown and performance compared. The time-shift "q" operator is introduced in accordance with the Zero-Order Hold (ZOH) behavior produced by the sampling and analog-to-digital converter used in the loop. The time-shift operator is used to produce an error predictor and model-prediction errors used to produce control equations.
A digital controller is written and used to control both digital and analog systems and the results are compared. The controller is modified to use different sampling periods and the results are compared to show the performance of the digital control over the same analog system and its dependence on sample rates. The methodology is shown to provide a fast digital controller for a high order system without a complex compensator.
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