This paper deals with the influence of electronic elements, especially the saturation of servo-amplifier and the demodulator filter in the feedback loop of the servovalve. Nonlinear numerical analysis and linear approximation theory are applied to calculate the frequency responses and the wave forms of the system variables. The demodulator filter for LVDT results in an increase of gain and a decrease of a phase lag of spool motion. Thus, it can improve the system response under suitable combination of parameters. The saturation of servo-amplifier distorts wave forms of flapper and spool motion, and renders their frequency response worse.
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Urata et al. (1999) studied this question.
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