CURRENT ISSUE – HIDRAULICA Magazine No. 3/2024
Assessing the Remaining Useful Life of Hydraulic Pumps: A Review
Author: Ștefan ŢĂLU
Predicting the remaining useful life of hydraulic pumps is critical for ensuring their optimal performance and extending their operational lifespan. Accurate remaining useful life predictions enable timely adjustments to the pump’s working conditions, thus enhancing maintenance strategies and preventing unexpected failures. This review comprehensively examines the two primary categories of remaining useful life prediction methods for hydraulic pumps: data-driven and model-driven methods. Data-driven approaches leverage historical and real-time operational data, employing machine learning and statistical analysis techniques to forecast remaining useful life. In contrast, model-driven methods utilize physical models and failure mechanisms to predict the remaining lifespan based on … (read more)
Considerations on Making Test Stands for Small Hydraulic Turbines
Authors: Teodor-Costinel POPESCU, Alina-Iolanda POPESCU
Hydraulic turbine test stands represent an important link in the efficient utilization of the energy potential of water flows. The realization of these turbines begins with an approximate design, based on the differential equations of motion of ideal fluids, and continues with successive stages of performance testing in the laboratory, on small-scale models. Using different similarity criteria based on geometric, kinematic and dynamic similarities, the conclusions drawn from the operation of the model will also be valid for the real machine. The purpose of the paper is to present some points of view on the realization of three types of stands for small hydraulic turbines, of which … (read more)
Pulsation Characteristics on Volumetric Gear Pump Operation within Hydraulic Circuit
Author: Fănel Dorel ȘCHEAUA
Hydraulic pumps are essential components in hydraulic systems requiring precise and powerful motion control. The choice of pump depends on factors like the required flow rate, pressure, fluid type, and application environment. Pulsation in the context of hydraulic actuation systems refers to the periodic fluctuation of pressure and fluid flow rate within the hydraulic circuit, often caused by … (read more)
Research on the Involvement of Intelligent Robots in the Assembly of Modern High-Performance Computers
Authors: Iulian Sorin MUNTEANU, Viorel NIȚICALĂ, Aurelian ȘTEFĂNESCU, Andreea Dana ALIONTE, Ana Maria MUNTEANU
This research examines the use of programmed intelligent robots for the assembly process of supercomputers (high-performance computers – HPCs), drawing on multiple and credible/reputable scientific sources, highlighting the impact on the efficiency and quality of this industrial production, flawlessly achieved by handling and assembling the complex components of supercomputers (HPCs), once with reducing errors and improving the accuracy of … (read more)
Hydrostatic Transmission for Small-Power Wind Turbines
Authors: Alexandru-Polifron CHIRIȚĂ, Ionaș Cătălin DUMITRESCU, Radu-Iulian RĂDOI, Marian BLEJAN
This research explores the use of a dual open-circuit hydrostatic transmission system for small-power wind turbines, replacing the traditional closed-circuit design. Through AMESim simulations, the system’s performance was evaluated, focusing on power transmission, electric generator frequency regulation by a PID controller, and system stability. The results show that … (read more)
Simulation and Analysis of Fire Sprinkler Systems Using EPANET for Enhanced Hydraulic Performance
Authors: Florin-George GIONEA, Denis-Mihai BURADA
EPANET is a simulation software program developed by the United States Environmental Protection Agency (EPA) used to model water distribution systems. It is used by engineers and hydraulics specialists to design and analysis networks of pipes, tanks, pumps, valves and other components of water distribution systems. EPANET can simulate the distribution of water flow and pressures in … (read more)
Challenges and New Approaches regarding Devices, Mechanisms, Robotic Systems, and Sensors Used in Modern Military Technique
Authors: Aurelian ȘTEFĂNESCU, Iulian Sorin MUNTEANU, Viorel NIȚICALĂ, Andreea Dana ALIONTE, Ana Maria MUNTEANU
This article presents a comprehensive overview of the integration of robotic systems and artificial intelligence (AI) in military applications, focusing on land-based robotic platforms. It highlights the mobility mechanisms of military robots, including wheeled, tracked, and biomechanical (legged) systems, as well as the power sources and control technologies that enable their operation. The analysis extends to … (read more)
Recovery of Potential Energy by Using a Digital Hydraulic Cylinder
Authors: Ioan PAVEL, Gabriela MATACHE, Ștefan-Mihai ȘEFU
The recovery of energy in hydraulic systems is becoming increasingly essential not only to reduce energy consumption but also to lower carbon emissions into the atmosphere. A significant portion of the articles and studies published address the recovery of potential energy in hydraulic accumulators and its use to compensate for consumption peaks. This article presents a solution for recovering potential energy in a lifting/lowering device equipped with a digital hydraulic cylinder, converting this energy into … (read more)
STEM Education and Mechatronic Applications: Mechanisms, Devices, and Systems in the Development of Youth and Students
Authors: Viorel NIȚICALĂ, Iulian Sorin MUNTEANU, Aurelian ȘTEFĂNESCU, Ana Maria MUNTEANU, Daniel – Mircea POPESCU
This article examines the essential role of STEM education in mechatronics, emphasizing its impact on developing youth and students. As nations recognize the necessity of preparing future generations for a technology-driven workforce, initiatives are being introduced to align higher education with Industry 4.0 demands. Through interdisciplinary projects and innovative methods, students gain vital skills in science, technology, engineering, and mathematics. The paper highlights successful educational programs and discusses the integration of … (read more)
Electrohydraulic Servo Actuators with IoT Capabilities
Authors: Marian BLEJAN, Andrei BLEJAN
The following document details an electrohydraulic servo actuator system with Internet of Things (IoT) functionalities, highlighting its main components: control electronics, the servo amplifier, the power supply, the servo valve, the hydraulic actuator, and the feedback transducer. The system utilizes a two-degree-of-freedom (2- DOF) controller and IoT integration for monitoring and preventive maintenance. The system implementation is done using a Modicon M221 PLC and a Raspberry Pi single-board computer for … (read more)
Methods to Reduce and Control Risks Arising from Head Loss in the Transportation of Water through Pipes and Fittings Used for Firefighting
Authors: Denis-Mihai BURADA, Florin-George GIONEA
The article presents a series of cases transformed in methods, which can be used to reduce and control the losses of energy at water transportation through … (read more)
River Stream Order and Tree Branches or Roots: An Analogy Related to Water Retention Capacities
Authors: Maritza Liliana ARGANIS-JUÁREZ, Margarita PRECIADO-JIMÉNEZ, José Avidán BRAVO-JÁCOME
Order concept for hydrological basin is presented and a comparison is made with shapes presented by both the branches and roots of trees and plant species, indicating that said order can be seen as an indicator of intersection or water retention capacities, level of water stress and … (read more)
Sustainable Development Goals – Scenarios Aimed at International Promotion through Pedagogy and Thematic Philately
Authors: Bogdan-Vasile CIORUȚA, Ioana-Elisabeta CIORUȚA, Alexandru Leonard POP
The Sustainable Development Goals continue to be in the spotlight and the order of the day, being considered some of the major initiatives regarding environmental protection that have appeared in the last period. Their impact on the life of local communities, as well as in the academic community, is a substantial one, they put pressure on those who make decisions to adopt policies, strategies, and good practices, responsible for the environment and the dynamic development of society. Beyond the various scenarios regarding the long-term sustainability of some measures and solutions, an impressive effort has been and must be made to … (read more)
