A Dynamic Model of the Flapper-Nozzle Component of an Electrohydraulic Servovalve

[+] Author and Article Information
S. J. Lin

Department of Industrial Technology, Eastern Michigan University, Ypsilanti, Michigan 48197

A. Akers

Department of Engineering Science and Mechanics, Engineering Research Institute, Iowa State University, Ames, Iowa 50011

J. Dyn. Sys., Meas., Control 111(1), 105-109 (Mar 01, 1989) (5 pages) doi:10.1115/1.3153006 History: Received October 05, 1987; Online July 21, 2009


An analysis has been conducted on the flapper-nozzle stage of a two-stage electrohydraulic controller that has been specifically designed to be a stable, stand-alone dynamic system. Calculations performed on equilibrium control pressures, stage gain, and frequency response characteristics agree with values obtained experimentally to within close limits. The analysis applies generally to a flapper-nozzle combination using any set of dimensions convenient for the designer. Flow-pressure equations and flapper dynamic properties have also been given to enable the designer to obtain full design characteristics.

Copyright © 1989 by ASME
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