Abstract
In this paper experimental studies and their computer simulations with respect to optimal responses of an electrohydraulic servomechanism as a high-speed accurate positioner are presented. This servomechanism is made of a linear actuator controlled with two different servovalves, a few kilograms of inertial load, detectors and electric control circuits. To get quick and precise responses, three control modes are applied: acceleration, deceleration and final positioning control. Optimal switching curves from acceleration to deceleration were empirically obtained under reasonably stable conditions.We have thus realized 20 - 30 msec positioning time and ± 5 micrometer accuracy throughout 0 - 5 cm access distance.
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