Composite servo hydraulic cylinder is an innovative solution of hydraulic cylinder weight reduction.Friction characteristics is one of the core factors,which affects the control accuracy and dynamic performance of electro-hydraulic servo system.Traditional hydraulic cylinder friction test adopts imprecise starting pressure measurement method.A wide-speed range and high efficiency precision friction testing method is proposed for a new composite hydraulic cylinder.In this friction test method,the speed of the cylinder under test is driven and controlled by a hydraulic test rig.A friction-velocity feature points marking method and a step size adaption control method are proposed to improve the accuracy of friction characteristic test.The friction-speed relationship curve of the hydraulic cylinder in a wide speed range is obtained.The friction characteristic parameters of the hydraulic cylinder under test are identified by fitting the friction-velocity curve to the Stribeck equation.This friction test method has been applied to a test bench,and the friction characteristics of a carbon fiber hydraulic cylinder has been tested to verify the effectiveness of the test method.
hydrostatic transmissionservo hydraulic cylinderfriction characteristicscomposite materialsfriction test
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