Accumulator is an important component for oil-hydraulic circuits. It is used for storing energy, absorbing pulsation flow, and suppressing surge pressure. For predicting accumulator performance, mathematical models of the accumulator have been investigated by many researchers. In the mathematical models of accumulator, an equation of state of gas, thermodynamics, and heat transfer have been considered. The aim of this paper is to propose a mathematical model of bladder-type accumulator considering heat conduction effect inside rubber membrane. Experiments were carried out using a bladder-type accumulator which was connected to a piston-type accumulator. The bladder-type accumulator was prefilled first and then discharged, the piston-type accumulator was charged by the oil discharged from the bladder-type accumulator. Discharging process of the bladder-type accumulator and charging process of the piston-type accumulator were measured simultaneously. The accumulator model proposed was validated by measured date of the experiments.
The physical properties of lubricant under high temperature and high pressure include high pressure viscosity, high pressure density, bulk modulus, coefficient of thermal expansion, etc. It is important to know these high pressure physical properties in machine design. However, almost no discussion has been made on the liquid state equation, which is the basis of the high pressure physical properties of these lubricants. Therefore, in this report, using the high pressure density measuring device, the volume was obtained from the measurement of the density at each temperature and pressure, and the PVT relational equation was derived. Further, Vt=0 (absolute zero degree volume), RL (liquid constant), PR (correction pressure for the pressure decrease due to liquid intermolecular force) included in this equation are liquid specific constants. This equation is consistent with the ideal liquid state equation derived from thought experiments, and it was found that this equation could be utilized as a liquid state equation of high utility. In addition, we can estimate the high pressure density which is one of the high pressure physical properties of the lubricant by this liquid state equation.