The hydraulic stiffness can be calculated and should normally be greater than 4 Hz. However this does involve a great deal of calculation and normally will take too long to sort out potential problems.

If your system's hydraulic stiffness is too low then the fluid will act like a spring and your actuators will bounce.

Fundamentals of Load Control

System Natural Frequency

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All hydraulic fluid is compressible. Long pipe lengths(volumes) between the valve and the cylinder or a large load relative to the cylinder area may result in an unstable operation.

System Natural Frequency

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