Approximate models of spool dynamics are proposed to deal with dynamic delays observed for an industrial electro-hydraulic valve. The suggested model consists of a linear block and two static ...

Water hydraulics, which use water instead of oil as working medium, have several advantages and could not only improve the system performance but also the general acceptance of hydraulics. This paper ...

Piezostack Direct Drive Valve The hydraulic direct drive valve system driven by piezoelectric actuator providing high accuracy and fast response is devised in this work. A spool valve is applied for ...

Smart Structures and Systems Laboratory, Department of Mechanical Engineering, Inha University, Incheon, South Korea This paper presents tracking control performances of a piezostack direct drive ...