Version 1.0, August 31, 2001, Copyright, Hugh Jack 1993-2001
· Very powerful and well suited to slower speeds with higher forces.
· Use of fluids, and high pressures can make this method awkward, messy, and noisy when improperly applied.
· Becoming less common in smaller force applications, as electrical systems mature
· Typical hydraulic systems use a simple solenoid valve to actuate devices, some newer developments use more sensitive devices
· A hydraulic actuation system is shown below
· Higher maximum accelerations that D.C. motors
· small time constants giving smooth operation
· time constant of hydraulic servo valve is about 5ms
· cylinders have small motions
· rotary motions with gearing are most common