Follow-up Control of Hydraulic Power System of Series Circuit

Abstract

In a series hydraulic circuit with a couple of loads, the follow-up control system that the rotational speed of the second hydraulic motor could be changed in accordance with the value of the first hydraulic motor, was studied theoretically and experimentally.
(1) This system consists of a sensing device and a velocity adjusting device. The sensing device is a spring type pressure transducer. The velocity control circuit has a pressure compensating type flow control valve with a bleed-off circuit
(2) The first motor was loaded by a power sprayer and the second one was loaded by driving a fan for duster.
(3) Steady state characteristics of this follow-up control system have a relationship of linearity between torque of the first motor and rotational speed of the second one.
(4) Transient responses of the system have rapid damping, a little time lag and good stability. Speed of response could be made higher by using the hydraulic system with series circuit.
(5) The dynamic characteristcs of the hydraulic driving system is under great influence of the inertia torque of load and the capacity of actuator. Using the actuator which has a capacity suited to inertia torque of load, the responsability for the system would become desirable.