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Design of a Hydraulic Actuator Test Stand for Non-Linear Analysis of Hydraulic Actuator Systems

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Pp. 169-183 in Automation Technology for Off-Road Equipment, Proceedings of the July 26-27, 2002 Conference (Chicago, Illinois, USA)  701P0502.(doi:10.13031/2013.10004)
Authors:   Jill E. Krutz, David F. Thompson, Gary W. Krutz, Randall J. Allemang
Keywords:   Non-linear hydraulic, Fluid power test stand, Vibration, Natural frequency, Envelope of stability, Pressure oscillations

Stability is imperative in the design of hydraulic systems. Servo-hydraulic systems are inherently non-linear creating various nuances when analyzing the stability of the system. Friction, port flow, saturation, impact loading, line dynamics, and boundary conditions are a few of the many non-linearities found in servo-hydraulic systems which are to be analyzed using advanced non-linear stability analysis techniques. Some effects of instabilities induced by nonlinearities such as pressure oscillations, noise, etc., can be detrimental to the stability or operation of hydraulic systems especially when the design is near the envelope of stability.

A test stand has been developed to test the hydraulic cylinder system dynamics, with the inclusion of a mass-spring-damper system. An experimental modal analysis was performed on the hydraulic test stand to provide helpful information regarding the natural frequencies of the structure to insure that these frequencies do not lie near the natural frequencies of the hydraulic systems. Initial non-linear dynamic testing was completed on two hydraulic cylinders, consisting of finding the breakaway friction forces of the hydraulic cylinders.

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