Abstract
This paper describes the closed-loop response of a loaded, valve-controlled, high-pressure, hydraulic servo-mechanism to large-amplitude sinusoidal and transient input signals. Oil compressibility and leakage are included in the analysis. The system is of conventional constant-supply-pressure, d.c, position-control configuration. It consists of an electronic amplifier, a two-stage electrohydraulic transfer valve, and a ram-type actuator. The load is comprised of a mass, viscous damping, and Coulomb friction. Load loci and the describing- function technique are used to evaluate the closed-loop frequency response. Load loci and piecewise linearization are used to determine the closed-loop transient response.
Experimental verification of the analytical work is included.
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