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Dynamic Properties of Single-Spool and Two-Spool Two-Stage Servovalves
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Abstract
A mathematical model of a dynamically stable flapper-nozzle pilot valve has been used in conjunction with the second stage of a flow control valve that comprises a single spool. The model has been used to calculate the valve gain and the dynamic response of the component parts. Real-time and frequency response results have been compared with those when using a two-spool version of the same type, each of the two spools being identical to the spool used in the single-spool version. It is shown that the dynamic response is improved significantly when the single-spool replaces the two-spool version.
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Akers, A. and Lin, S., "Dynamic Properties of Single-Spool and Two-Spool Two-Stage Servovalves," SAE Technical Paper 901621, 1990, https://doi.org/10.4271/901621.Also In
References
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- Lin, S. J. Akers, A. “A Dynamic Model of the Flapper-Nozzle Component of an Electrohydraulic Servovalve,” Journal of Dynamic Systems, Measurement and Control 111 105 109 1989
- Lin, S. J. Akers, A. “A Nonlinear Model of a Flapper-Nozzle Valve “ Proceedings of American Control Conference 2 1520 1525 1989
- Lin, S. J. Akers, A. “Modeling and Analysis of the Dynamics of a Flow Control Servovalve That Uses a Two-Spool Configuration,” Paper No WA90/FP2
- Stringer, J. Hydraulic Systems Analysis John Wiley and Sons New York 1976