Reliability and maintenance analysis of transport machines hydraulic drives, basically focused to power units: pumps, cylinders etc., without taking in to account junction elements. Therefore, this paper proposes a research analysis on high-pressure hoses and junctions during technical maintenance. Comparative analysis of fluid behavior and energy efficiency inside non-repaired and repaired high-pressure hoses is presented in this research. Theoretical and experimental research results for hydraulic processes inside high-pressure hose is based on the numerical simulations using Navier–Stokes equations and experimental measurement of fluid flow pressure inside high-pressure hoses. Research of fluid flow dynamics in the hydraulic system was made with main assumptions: system flow rate in the range from 5 to 100 l/min, diameter of the hoses and repairing fitting are 3/8". The pressure drops, power losses, flow coefficients at non-repaired and after maintenance hose was obtained as a result. Simulation results were verified by running physical experiments to measure the pressure losses.
The article presents the findings of theoretical and experimental research on hydraulic processes occurring
in the hydraulic drives of transport machines. The paper analyses the influence of hydrodynamic processes on the flow characteristics
of fluid considering different hydraulic fitting connections. The performed analysis is based on numerical simulations using
Navier–Stokes equations for the velocity field. The dynamics of fluid flow in the hydraulic system has been investigated taking into
account the main parameters like system flow rate in the range of 5 to 100 L/min, the diameter of the pipeline making 1/2” and fitting
standards DKOL, ORFS, BSP and JIS. As a result, pressure drop, power losses, resistance and flow coefficients at different fitting
connections have been obtained. The article compares the provided results with the findings given employing the calculation method
for the standard of equivalent length fitting. To simulate fluid flow, a mesh independence study and turbulence calculations have been
performed. Simulation results have been examined conducting physical experiments on measuring pressure losses. Each experimental research
includes three measurements of connections bearing in mind each fitting standard.
Abstract. This paper focuses on review of modern energysaving technologies in hydraulic drives. Described main areas of energy conservation in hydraulic drive (which in turn are divided into many under the directions) and was established the popularity of them. Reviewed the comparative analysis of efficiency application of various strategies for energy saving in a hydraulic drive. Based on the review for further research a combined method of realtime control systems with energysaving algorithms and regeneration unit -selected for maxing efficiency in hydraulic drive. Scientific papers (40 papers), what introduced in review, is not older than 15 years in the databases "Sciencedirect" and "Scopus".
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