An analysis of the dynamics of mechanical feedback-type hydraulic servomotors under inertia loads is developed and experimental verification is presented. The analysis, which is developed in terms of two physical parameters, yields direct expressions for the following dynamic responses: (1) the transient response to a step input and the maximum cylinder pressure during the transient and (2) the variation of amplitude attenuation and phase shift with the frequency of a sinusoidally varying input. The validity of the analysis is demonstrated by means of recorded transient and frequency responses obtained on two servomotors. The calculated responses are in close agreement with the measured responses. The relations presented are readily applicable to the design as well as to the analysis of hydraulic servomotors.
About Victor L. Ransom
Victor L. Ransom '48 was employed at NACA immediately after graduating from MIT in 1948. He was among the 101 Tuskegee Airmen who took part in the 1945 Freeman Field Mutiny protest against segregation. Ransom earned his Masters degree in Electrical Engineering from Case Institute of Technology (today Case Western) in 1957. He would move up the ranks at Bell Laboratories and in the communications industry for the next 30 years. His areas of specialty included transistors and digital products, network switching technologies, systems for special needs, and environmental control systems design. Ransom holds two U.S. patents.
Gold, H., EW Otto, and VL Ransom. "NACA Report: Dynamics of Mechanical Feedback-Type Hydraulic Servomotors Under Inertia Loads" [NACA-TR-1125]. Report. National Advisory Committee for Aeronautics, Lewis Flight Propulsion Lab, Cleveland, OH. 1 January 1953.