CURRENT ISSUE – HIDRAULICA Magazine No. 1/2025

Hidraulica no 1/2025Braking Energy Recovery Hydraulic System for Heavy-Duty Machine Tools. Mathematical Modeling and Simulation
Author: Anca BUCUREȘTEANU

This paper examines the opportunity to recover the kinetic energy accumulated by the main kinematic chains of the heavy-duty machine-tools in downtime phase. The proposed unit can shorten the stopping time of the main spindle, with or without a blank, and would allow the recovery and storage of the accumulated kinetic energy in order to use it in … (read more)

Signal Processing Techniques and Mathematical Modeling for Analyzing and Diagnosing Cavitation in Centrifugal Pumps
Author: Ștefan ŢĂLU

Cavitation remains a critical issue in centrifugal pump operation, leading to performance degradation, structural damage, and increased maintenance costs. Effective cavitation detection and modeling are essential for improving pump reliability and efficiency. This review integrates two key aspects of cavitation research: signal-based fault detection methods and mathematical modeling approaches. First, we review various cavitation detection techniques based on vibration, acoustic emission, noise, and pressure pulsation signals. Each method’s advantages and limitations are discussed, focusing on … (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)

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)

“My Soil Protection App” – A Mobile-Based Dedicated Environmental Information System – from a User Testing and Validation Perspective
Authors: Bogdan-Vasile CIORUȚA, Ioana-Elisabeta SABOU (CIORUȚA), Marcela HRENIUC (SĂLIȘCAN), Alexandru Leonard POP, Mirela-Ana COMAN 

As part of the mobile application development and improvement process, evaluation and feedback along the way are essential elements for any software developer; they can provide him/her with information about both the value that the application has from the perspective of other users, as well as information that needs to be revised or removed from the interface and the functionalities that the application proposes. In this sense, for the mobile application “My Soil Protection App”, created in our regime, we proposed to carry out an analysis of … (read more)

Kinematic Analysis and Geometric Synthesis of Elevator Mechanisms with Non-Articulated X-Bars Mounted on Mobile Robots
Authors: Dana Mirela VĂLEANU, Păun ANTONESCU

X-shaped (scissor) articulated bar lifts take up less space in areas of use, such as warehouses. By folding, when not in use, these scissor lifts lower to their minimum level. The kinematic analysis of the mechanisms of these elevators involves the method of analytical calculation of the displacements of the main characteristic points of the dyadic chains. In the case of elevators with non-articulated bars in X, a problem of … (read more)

Experimental Evaluation of the Dynamic Response of Pneumatic Actuators Depending on Constructive and Operational Parameters
Authors: Gabriela MATACHE, Gheorghe ȘOVĂIALĂ, Radu-Iulian RĂDOI, Ana-Maria Carla POPESCU

The paper presents the experimental tests conducted in the Pneumatics Laboratory of the Research Institute for Hydraulics and Pneumatics INOE 2000-IHP on the factors influencing the dynamic behavior of medium and high-pressure pneumatic actuators. The tests were performed on two actuator size types from FESTO (DNCKE-100-200-PPV-A and DNCKE-40-130-PPV-A). The tests were carried out under no-load conditions and aimed to … (read more)