HIGH FREQUENCY VIBRATION TEST FIXTURE WITH HYDRAULIC SERVO VALVE AND PISTON ACTUATOR

摘要

A vibration test fixture having a fixture base (10) for carrying a unit under test, a hydraulic vibration actuator unit (16) having a cylinder, a piston that reciprocates in the bore within the cylinder, and a reciprocating piston rod (22) extending from the piston to the outside of the cylinder. A voice coil-driven hydraulic servo valve unit (18) adjacent the cylinder has an alternating waveform input inducing the servo valve to produce a hydraulic fluid flow at a desired frequency of vibration.