Dynamic Characteristics Comparison of Hydraulic Drives under Two Methods of Spool Valve Control

For various technical objects control the electrohydraulic servo drives with proportional control of spool-type switchgears are being increasingly implemented. These devices are cheaper then electrohydraulic amplifiers with servo spool valve. They are more reliable in operation due to the reduced sensitivity to contamination of the hydraulic fluid and also to its flow in the absence of control signals. As a result of computer simulation the problem of convergence of the dynamic characteristics of the electro-hydraulic servo drive with proportional control and servo-controlled spool valve was solved. The study showed that with a proportional control of electro-hydraulic servo drives the use of electronic regulator provides transitional characteristics similar to the characteristics of servo-controlled spool valve.

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