Experimental Determination of the Hydraulic Oil Temperature’s Effect on Power Balance in Hydrostatic Systems

Currently, the study of individual parameters’ influence on the energy efficiency of hydraulic systems is one of the leading research directions for these types of drives. Determining the influence of individual components and system architectures on the energy efficiency parameter for exemplary objects and systems is a new body of knowledge that allows for the development of a basic and general method for determining the energy efficiency of hydrostatic systems. The method developed and presented in this article extends this knowledge, making it possible to determine the influence of liquid parameters and individual system components on the energy efficiencies achieved by hydrostatic systems. The method used for determining individual factors’ influence on achieved system energy efficiencies is utilitarian and allows for the determination of how changes in specific parameters affect the efficiency of operational systems based on the results of pressure and motion speed measurements. Experimental tests were conducted to determine total power variations and the quantitative relationship between volumetric and flow resistance losses as the oil temperature increased from 25 °C to 75 °C.