HYDRAULIC (ACCELERATION SWITCHING) SERVO DYNAMIC PERFORMANCE UNDER EXTREME HIGH TEMPERATURE ENVIRONMENT,
JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB
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A 0.6 HP servo and a 3.35 HP servo were designed driving a predominately inertial load 8 in sq. sec. to provide dynamic data over the desired range of interest. Acceleration switching hydraulic servos were used in all tests since previous testing indicated this type of servo would more likely yield satisfactory operation under the high temperature environment. The servos were instrumented using commercially available components. This allowed a comparison of the relative merits of these components under high temperature environmental condition. Additional component reliability data were obtained on hydraulic fittings, static and dynamic seals, and bearings. Dynamic performance and system reliability was demonstrated over a wide range of temperature environment. The various hydraulic servos were operated at oil temperatures in excess of 400F for periods ranging from 1 to 5 12 hours duration. A summary of the time-temperature history of each test is shown.
- Hydraulic and Pneumatic Equipment