Analytical design of electrohydraulic servomechanisms with near time-optimal responses

An analytical method is proposed for practical design of electrohydraulic servomechanisms with near time-optimal response. The method, a dual-mode approach, involves opening the valve ports as wide as possible during the initial acceleration, followed by controlled closure during deceleration. The decelerating motion of the actuator load is critically controlled so that the actuator acts on the verge of cavitation. The proposed method leads to a simple dual-mode controller which can be implemented by a reasonably small amount of hardware. When a typical system was simulated on an analog computer, the results substantiated the validity of this design method.