In this paper, the dynamic performance of an unconventional two-spool flow control servovalve using a pressure control pilot is analyzed. Such valves are less expensive than typical servovalves but also tend to be limited in their dynamic performance. Based on a previously developed eight state nonlinear model, we develop a simplified linear model which is able to capture the essential dynamics of the valve. Using root locus analysis method, the limitation in dynamic performance is shown to be due to a “zero” introduced by the structure of the interconnection of the subsystems. Design parameters that move the zero further to the left half plane, and do not adversely affect other steady-state criteria are identified. The effectiveness of these parameters to improve the dynamic performance is demonstrated. This analysis demonstrates how the structure of the interactions between subsystems in a dynamic component, such as a hydraulic valve, can critically limit the dynamic performance of the component.
Dynamic Redesign of a Flow Control Servovalve Using a Pressure Control Pilot1
Contributed by the Dynamic Systems and Control Division for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received by the Dynamic Systems and Control Division February 1, 2001. Associate Editor: N. Manring.
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Li, P. Y. (July 23, 2002). "Dynamic Redesign of a Flow Control Servovalve Using a Pressure Control Pilot." ASME. J. Dyn. Sys., Meas., Control. September 2002; 124(3): 428–434. https://doi.org/10.1115/1.1485288
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