THEORETICAL ANALYSIS OF A TYPICAL SAMPLED-DATA SYSTEM
ARMY MISSILE RESEARCH DEVELOPMENT AND ENGINEERING LAB REDSTONE ARSENAL AL GUIDANCE AND CONTROL DIRECTORATE
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Closed loop servomechanisms are usually linear feedback systems operating on continuous signals. There is, however, a distinct class of servomechanisms which operates on sampled data. The input, or actuating signal, is represented by samples at regular intervals of time with information carried in the amplitude by samples. The analysis of sampled data systems presents several features quite different from those found in continuous systems. The error is measured, correction applied, and system passes through a waiting period before the next error measurement. This results in a tendency to over correct for the accumulated error. This report presents a mathematical stability analysis of a typical sample data servo using the Z transform and root locus. The system was simulated on a Donner 3200 analog computer and the results from this simulation were used to verify the calculated results.
- Test Facilities, Equipment and Methods