Automatic Control Systems - download pdf or read online

By Farid Golnaraghi, Benjamin C. Kuo

ISBN-10: 0470048964

ISBN-13: 9780470048962

Computerized regulate structures offers engineers with a clean new controls ebook that areas particular emphasis on mechatronics. It follows a progressive process via truly together with a actual lab. additionally, readers will locate authoritative assurance of recent layout instruments and examples. present mechatronics purposes construct motivation to profit the cloth. vast use of digital lab software program is usually built-in in the course of the chapters. Engineers will achieve a robust comprehend of keep watch over platforms with the aid of smooth examples and workouts.

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Example text

The errors between the actual and the asymptotic curves in Fig. 2-17 are also inverted. Toolbox 2-2-3 The Bode plot for Fig. 05 and co—l, using the MATLAB "bode" function, is obtained by the following sequence of MATLAB functions. Approach 1 Approach 2 num = [ 1 ] ; den= [ 1 . 1*3 + 1 ) ; bodeCG); 42 Chapter 2. Mathematical Foundation Bode Diagram 40 r i—i i i i -i 1 1 1—i—i—r i i L _i i i i 20 ! -20 - _i -40 0 i l u -45 /—s Cfl ID T3.

3. Give the definitions of ac and dc control systems. 4. Give the advantages of a digital control system over a continuous-data control system. 5. A closed-loop control system is usually more accurate than an open-loop system. (T) (T) (F) (F) 7. If an open-loop system is unstable, then applying feedback will always improve its stability. (T) (F) 8. Feedback can increase the gain of a system in one frequency range but decrease it in another. (T) (F) 9. Nonlinear elements are sometimes intentionally introduced to a control system to improve its performance.

Based on these facts, the procedure of drawing |1 + jcoT\dB is as follows: 1. Locate the corner frequency co = l/T on the frequency axis. 2. Draw the 20-dB/decade (or 6-dB/octave) line and the horizontal line at 0 dB, with the two lines intersecting at co = l / T . 3. If necessary, the actual magnitude curve is obtained by adding the errors to the asymptotic plot at the strategic frequencies. Usually, a smooth curve can be sketched simply by locating the 3-dB point at the corner frequency and the 1-dB points at 1 octave above and below the corner frequency.

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Automatic Control Systems by Farid Golnaraghi, Benjamin C. Kuo

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