A Study on the Unstable Phenomena in Hydraulic Driving System and Direct Servosystem
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In the present report, instability of a hydraulic driving system and a direct servosystem with a piston-type control valve is studied. The theoretical and experimental investigations are carried out on the system with underlapped valves, taking account of flow forces acting on a valve spool and the compressibility of oil in a cylinder. The results obtained are summarized as follows. (1) Oscillations occurring in the system are distinguished as two types, i.e., oscillations I and II, according to their characteristics. The oscillation I is of the type caused by the influence of the steady-state flow force acting on the valve, and the oscillation II is of the type caused by the compressibility of oil in the cylinder. (2) Both the oscillations I and II build up limit cycles. The limitation of the amplitude of the oscillation I or II is caused by the effect of the damping force acting on the valve spool, or by the effect of the valve which acts as a damping element, respectively. (3) The stability criteria of the system and some characteristics of the oscillations derived from theoretical analysis are compared with the results obtained from computations by an analog computer and experiments. Their agreement is good.
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