自動(dòng)控制理論2

1、Lecture 1Introduction to Feedback ControlNorth China Electric Power UniversitySun Hairong1Topics of this class What can be called Automatic Control System Open-loop and closed-loop controlFeedback Control To know some termsClassification of control systems The performance of closed-loop controlReadi

2、ng: Module 1. 21. Automatic control systemExamples 31.1 Example 1Water temperature control system41.2 Example 2Automatic Water temperature control system52. Open-loop and closed-loop control 62.1 open-loop control(1) Example1 : Direct current motor speed regulating system 7(2)Example2 : Water temper

3、ature controlConclusion:Its not high performance systems.System error will develop because of: * Disturbances acting on the system. * Parameter variations of the system.It can not resist disturbance. The solution is to use closed-loop control82.2 close-loop controlGeneralized Automatic control syste

4、m: Forward path Feedback path Differencing junction(Comparator) Control signal9Conclusion:* Compares the error between the output and the reference input.* The output must be held as close as possible to a desired value.* Resist any disturbance in the loop.102.3 Termsinput, output, error, disturbanc

5、e, Control signaldifferencing junction, forward path, feedback pathfeedback, loop113. Feedback Control 123.1 Motivations for feedback Feedback can be used to improve the performance measures we just described. Feedback can resist any disturbance in the loop133.2 Positive feedback and negative feedback144. Classification of control system