非対称アンダ-ラップ弁を有する油圧サ-ボ系における硬発振現象

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This paper deals with an analytical and experimental study on the hard self-excitation phenomenon in the hydraulic unity feedback servomechanism operated by a spool valve with asymmetrical underlap. The nonlinear equations describing the system performance are numerically solved by Runge-Kutta-Gill method. Conclusions obtained are as follows:(1) The stability of the neutral position of the valve is improved by increasing the supply underlap. But delivering a large step input beyond the critical value Zcr to the system stabilized as mentioned, will often start a self-oscillation to lead the system into instability. This phenomenon is the so-called "hard self-excitation".(2) As the supply underlap εs increases, the critical value Zcr of the step input required to excite the hard self-excitation increases.(3) For a small underlap ratio λ(=exhaust underlap εe/supply underlap εs), the hard self-excitation appears and for a large value of λ, the oscillation changes into the soft self-excitation.
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