CURRENT ISSUE – HIDRAULICA Magazine No. 2/2025
Tribological Mechanisms in Water Hydraulic Axial Piston Pumps: Insights into Lubrication, Cavitation, and Wear Control
Author: Ștefan ŢĂLU
Water hydraulic axial piston pumps (WHAPs) represent a critical innovation in eco-sustainable fluid power systems, yet their tribological behavior under water-lubricated conditions remains a persistent engineering challenge. This study provides a focused review of three key tribological mechanisms -hydrodynamic effect, cavitation effect, and wear debris storage – essential to understanding and optimizing the performance of friction pairs in such pumps. Under hydrodynamic and mixed lubrication regimes, surface textures induce convergent and divergent geometries that generate … (read more)
Modeling and Simulation of the Operation of the Hydro-Pneumatic Accumulators
Author: Anca BUCUREȘTEANU
This paper introduces some mathematical models and simulations of the operation of the hydro-pneumatic accumulators from the hydraulic actuation systems. There are presented static but also dynamic models that can be used in the design of the hydraulic units. The operation in dynamic mode was simulated by means of specialized programs such as Matlab/Simulink and Automation Studio. A real, numerical example, which was the basis for … (read more)
Considerations regarding the Use of Infrared Thermography in the Maintenance of Hydraulic Drive Installations
Authors: Teodor Costinel POPESCU, Alina Iolanda POPESCU
Infrared thermography, as a non-contact investigation technique, has proven its usefulness in preventive maintenance and in monitoring mechanical, electrical systems or production processes. Engines, pumps, couplings, hydraulic installations, rotating equipment, servomechanisms, furnaces, tanks, but also other equipment can be found in all industrial activities. Examples of the use of infrared thermography are known only at the level of hydraulic components, not hydraulic drive installations / systems. For this reason, the authors present several points of view regarding the use of this technique on a specific case of … (read more)
Performance and Efficiency Aspects for Hydraulic System with LS Valve
Author: Fănel ȘCHEAUA
Hydraulic volumetric units are critical hydro-dynamical components in fluid transport systems across various industries and advancements in their performance and efficiency have become a key focus for energy conservation and operational optimization. Recent trends emphasize variable speed control, allowing pumps to adjust their speed dynamically through variable frequency drives (VFD) to match system demands, thereby reducing energy waste. Additionally, the integration of LS valve within the system, smart monitoring and predictive maintenance is enhancing … (read more)
Performance Analysis of a Solar Fruit Dryer under Controlled Conditions
Authors: Ioan PAVEL, Gabriela MATACHE, Gheorghe ȘOVĂIALĂ, Ana-Maria Carla POPESCU
Solar energy is one of the most accessible and environmentally friendly sources of renewable energy, widely used in the drying of agricultural products. Compared to conventional methods, solar drying offers significant advantages such as improved energy efficiency, low operating costs, minimal environmental impact, and better preservation of the … (read more)
Simulation of Hydraulic Motor Controlled by the Control Valve
Authors: Tiberiu AXINTE, Mihăiță CAZACU, Gabriela CURCĂ, Lidia CALANCEA, Mihai DIACONU, Camelia PASCU
The paper presents an overview of the importance of installations with hydraulic motors. In this manuscript, we are studying two hydraulic circuits and one electro-hydraulic circuit, which contains 4/2-way hand-lever valves. Thus, the first hydraulic circuit contains the following devices: fixed displacement pump, three tanks, 4/2-way hand-lever valve, two throttle valves, pressure relief valve, and … (read more)
Implications of Dedicated Environmental Information Systems in the Firiza Valley Area (Baia Mare, Romania) Characterization to Establish the Dynamics of Pollutant Transfer from Soil to Crop Plants
Authors: Marcela HRENIUC (SĂLIȘCAN), Bogdan-Vasile CIORUȚA, Ioana-Elisabeta SABOU (CIORUȚA), Alexandru Leonard POP, Mirela-Ana COMAN
We start from the idea that environmental information systems (EISs) – developed under the aegis of environmental informatics (EI) – have been within the reach of specialists and practitioners for more than 3-4 decades, favoring the sustainable development of communities, by making and applying the best possible decisions. From the perspective of soil resource protection and sustainable land management, this paper proposes to analyze … (read more)
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Hydrological and Land Use Changes in the Bajo Balsas River Basin: Impacts on Water Storage at El Infiernillo Dam
Authors: Eduardo JUAN-DIEGO, Maritza Liliana ARGANIS-JUÁREZ, Margarita PRECIADO-JIMÉNEZ, Alejandro MENDOZA-RESÉNDIZ, Rodrigo ROBLERO-HIDALGO
This paper analyzes trends in water storage at El Infiernillo Dam in Michoacán, Mexico, and its relationship with climate and land use factors. Using historical data from 1994 to 2024, the research identifies a significant decline in the dam’s storage volume, particularly after 2002, attributed to increased evaporation and water withdrawals for agricultural and urban use. Land use changes in the Bajo Balsas River basin, including a 17.25% increase in … (read more)
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