The Variation of Oil Effective Bulk Modulus With Pressure in Hydraulic Systems

Abstract

The paper presents theoretical modeling and an experimental investigation of the variation of oil effective bulk modulus (βe) with pressure in hydraulic systems. A pressure sensitive model of βe and its several simplified forms have been derived. In addition, a method for parameter identification has been formulated. In an actual hydraulic system, values for βe at different load pressures were obtained, model parameters identified and modelling errors evaluated.