What type of actuator instability arises if a hydraulic control valve's poppet rapidly oscillates relative to its seat?

💡 Explanation

Rapid poppet oscillations induce a limit cycle oscillation within the actuator due to fluid compressibility altering the effective damping. This occurs because the poppet's motion, rather than steady state, creates self-sustaining oscillations; therefore the system doesn't settle, rather than converging to a setpoint.

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