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Learn how to control hydraulic motion systems by adjusting second derivative gain

Some hydraulic systems, on the other hand, must deal with the effects of the compressibility of the hydraulic fluid medium, which can be modeled as a mass between two springs, where the piston and the load are the mass and the oil on either side of the piston is the springs. With such systems, simple P only, PI or PID controls often exhibit performance limitations due to the natural frequency and damping factor of the hydraulic/mechanical design. For such systems, called “second-order systems,” algorithms that employ second derivative gains are often needed.
Tips for Smooth, Precise Hydraulic Motion Control

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