On the unstable vibration occurring in a hydraulic servomechanism controlled by a throttle valve. 2nd Report. Dynamic characteristics of thrust force acting on throttle valve and mechanism of unstable vibration.

Abstract

The dynamic characteristics of a thrust force acting on a throttle valve are examined experimentally, so as to clarify the vibration energy supply occurring in the hydraulic servomechanism. The action of the thrust force lags a little behind the valve opening due to the inertia effect of oil. The vibration energy is supplied into the servomechanism by this lagging of the thrust force. The simulation of mode II vibration agrees well with the experimental result. As an overall result, it is ascertained that three modes of vibration are induced by this dynamic characteristic of thrust force, that is, by the lagging of thrust force action.