DYNAMICS OF AN ELECTRO-HYDRAULIC VELOCITY SERVO WITH STICK-SLIP FRICTION

Abstract

Electrohydraulicservos exhibit nonlinear behavior whenever subjected to dynamic inputs due to the presence of several significant nonlinearities in the servovalve and hydraulic motor. Some mechanical nonlinearities are often responsible for performance limitations as expressed by speed of response, accuracy and stability. This paper deal with the dynamic characteristics of electrohydraulic velocity servos in order to throw more light on the complicated role played by stick-slip friction of the actuator.