THE EFFECT OF HYDRAULIC FLUID MODULUS VARIATION DUE TO AIR BUBBLES ON HYDRAULIC POSITIONAL SERVOMECHANISM

The presence of air bubbles in hydraulic fluid changes very strongly the fluid compressibility which gives rise to a negative fact in the system behavior. This paper discusses the problem of interest and gives some instructions to determine the critical volume ratio of air-oil mixture from the point of view of both transient response and steady-state of the system. The suitable operation pressure is also proposed for a required system behavior