l2 - 16.060 Lecture 2 Introduction to Feedback Control...

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Unformatted text preview: 16.060 Lecture 2 Introduction to Feedback Control Karen Willcox September 4, 2003 Todays Topics 1. Classification of control systems 2. Open-loop and closed-loop control 3. Standard block diagrams 4. Tools of the trade Reading : 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7 to the top of page 14. 1 1 Classification of control systems (vdv 1.2) 1.1 Regulator systems The output must be held as close as possible to a desired value. Examples: 1.2 Servomechanisms The input varies and the output must be made to follow as closely as possible. Examples: 2 If we take a closer look, control systems can be classified as follows: 1. 2. 3. 4. 5. 6. 3 2 Open-loop and closed-loop control (vdv 1.3) 2.1 Open-loop control Example 1: an electric toaster-the output , c , is the shade of the toast-we want to realize a constant output-we do this by choosing a setting on a mechanical timer-this setting is the system input , or reference shade, r This is not a high performance system. A system error , e = r c will develop...
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l2 - 16.060 Lecture 2 Introduction to Feedback Control...

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