lecture6 - 1 6 Concept of Control System: Open-...

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Unformatted text preview: 1 6 Concept of Control System: Open- & Closed-loop D/A Controller ( P) actuator Dynamic system sensor A/D output command error Digital to Analog Converter Analog to Digital Converter + _ Closed-loop System: 2 Open- & Closed-loop (cont.) D/A Controller ( P) actuator Dynamic system output command Digital to Analog Converter Open-loop System The output is not fed back to the controller 3 Advantages of Closed-loop Control systems: It can cope with unexpected changes in the system It can handle unforeseen disturbances 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. 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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This note was uploaded on 11/09/2009 for the course ENG 91301 taught by Professor Lui during the Spring '08 term at Hong Kong Institute of Vocational Education.

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lecture6 - 1 6 Concept of Control System: Open-...

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