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lecture6 - 6 Concept of Control System Open Closed-loop...

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  1 6 Concept of Control System: Open- & Closed-loop D/A Controller ( μ P) actuator Dynamic system sensor A/D output command error Digital to Analog Converter Analog to Digital Converter + _ Closed-loop System:
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  2 Open- & Closed-loop (cont.) D/A Controller ( μ P) actuator Dynamic system output command Digital to Analog Converter Open-loop System The output is not fed back to the controller
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  3 Advantages of Closed-loop Control systems: It can cope with unexpected changes in the system It can handle unforeseen disturbances
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  4 Use of Open-loop Systems   When the system is known quite precisely and it does not change much When most of the external disturbances can be estimated and, therefore, can be accounted for.
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  5 Modelling of Dynamical Systems Use physics to derive the  differential      equations. Example: mechanical system The applied force f(t) equals      the sum of the inertia, damping      and spring force.
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