Abstract
In order to investigate the practical aspect of a series of constrained control laws proposed by the present authors, an experimental examination using a servomechanism as a controlled object has been done. The control laws are as follows : (i) linear control, using an admissible gain, (ii) variable gain feedback control, (iii) relay control via the gain satisfying the Popov condition, and (iv) relay control for a quadratic performance index.
The results of the experiment have shown high performance of Controls (ii), (iii) and (iv). Control (i) is not effective, because of the dead zone in the servo system. These control laws are so simple that the sampling time for Direct Digital Control can be 30-70 ms when using the interpreter-type BASIC program on a 16-bit personal computer (the clock frequency of CPU is 10 MHz).
