ISSN 2343–7707 ; ISSN-L 1453-7303

Here below we post a list of
Articles already accepted for publication in Issue 2/(June) 2023 of Hidraulica Magazine.
The list displays the article title, author(s) and affiliation,
and also the article abstract.
Full-length article will be available online only after publication. 

  • Opinions Regarding the Assessment of Pressure Drop in Tangential Feed Cyclones for Cleaning Industrial Dry Gases
    Ph.D. Candid. Melania CORLECIUC (MITUCĂ)1, Professor Emeritus Ph.D. Eng. Radu I. IATAN2, Assoc. Prof. PhD. Eng. Ion DURBACĂ2, Lecturer PhD. Eng. Georgiana Luminiţa ENĂCHESCU2, Lecturer PhD. Eng. Anca Mădălina DUMITRESCU2, Assist. Prof. PhD. Eng. Gheorghe Cosmin CIOCOIU2
    1National Agency for Environmental Protection, Romania
    2POLITEHNICA University of Bucharest, Romania

Cyclones are used to remove solid particles larger than 5μm from impure industrial gases. They are simple constructions, without moving parts and easy to maintain. In the use of such equipment, main interest is to evaluate the pressure drop in the cyclone and the efficiency of separation. Ensuring a high value of the pressure drop involves high energy consumption, aiming to increase the separation efficiency. Many studies, exposed in the content of this work, have been carried out, in the sense of the above topic, for pressure loss assessment. The results of the empirical formulas, proposed over time, were compared, in the specialized literature, with those offered by the experimental results, obviously for practical cases of great interest.

  • Hydraulic System of Return Backlash Takeover with Pressure Bearing and without Rotary Fitting
    Prof. PhD Eng. Anca BUCUREȘTEANU1
    1University POLITEHNICA of Bucharest, Romania

This paper makes a brief presentation of the systems of return backlash takeover currently used in the kinematic chains for circular feed in machine tools but also of a new system patented by the authors. This system is uncomplicated, effective and simplifies the kinematic chains of the machine tools. It can be applied to vertical lathes that can make milling operations too because it allows the overlapping of the kinematic chain for turning operations with the circular feed kinematic chain for boring or drilling operations. The system comes as a result of minimum modifications of the final pinion and can be used for all machines remanufactured but for the brand-new machines too. With minor constructive modifications, this system can be also applied in the feed and positioning kinematic chains for linear feed movements that use rack and pinion mechanisms.

  • New Trends and Developments of Additive Manufacturing in the Field of Hydraulic Drive Systems according to the Circular Economy Concept 
    PhD. Stud. Eng. Alexandru-Polifron CHIRIȚĂ1, PhD. Eng. Adriana Mariana BORȘ1, MSc. Eng. Andrei-Alexandru BENESCU1
    1National Institute of Research & Development for Optoelectronics / INOE 2000 – Subsidiary Hydraulics and Pneumatics Research Institute / IHP, Bucharest, Romania

Increasing the efficiency of hydraulic drive systems (HDSs) maintenance activities is a permanent concern at the global level as a result of the considerable expansion of their field of applicability. The maintenance of HDSs is part of the integrated management concept and it is a complex approach to specific activities in order to maintain HDSs performance. The development of additive manufacturing methods applicable for hydraulic components based on the principle of reverse engineering gives stability to functional characteristics and reliability in the context of the circular economy. The application of reliability-based maintenance (RBM) strategies requires the detection and exploitation of the maximum potential of HDSs operation. Through 3D printing technology, which enables innovative performance and flexibility in on-demand production, there is the opportunity to remanufacture hydraulic components with complex geometry and specific characteristics.  At the end of the article, examples of the application of additive manufacturing technologies and the adaptation of the reverse engineering principle in the field of hydraulic drive systems are presented.

  • Generation of Non-Linear Equations to Approximate the Normalized Annual Agricultural Production Curve, Using Drought Indexes
    Eng. Valdemar TORRES ESPINOSA1, PhD. Maritza Liliana ARGANIZ JUÁREZ2,3
    1Escuela Superior de Ingeniería y Arquitectura, Instituto Politécnico Nacional, Ciudad de México, México
    2Instituto de Ingeniería, Universidad Nacional Autónoma de México, Ciudad de México, México
    3Facultad de Ingeniería, Universidad Nacional Autónoma de México, Ciudad de México, México

Extreme droughts are one of the biggest problems for agricultural and livestock activities throughout Mexico. These events have caused a decrease in income for producers due to the increase in input costs, which in turn causes an increase in the price of products and food for the poorest populations. In this research equations that allow us to estimate a normalized value of agricultural production in each state of Mexico were obtained. The equations were generated with optimization of their parameters using genetic algorithms and were taken as data from agricultural production records and drought indexes registered in the country. These, in turn, depend on the return period of drought events. These models can be used to estimate agricultural production given a drought with a given return period, which will help to take preventive actions against this problem.

  • Evaluation of Stress States in Areas with Geometric Structure Discontinuities in the Configuration of Pressure Equipment I. Direct Discontinuity
    Professor Emeritus Ph.D. Eng. Radu I. IATAN1, Assist. Prof. PhD. Eng. Gheorghe Cosmin CIOCOIU1, Lecturer PhD. Eng. Anca Mădălina DUMITRESCU1
    1POLITEHNICA University of Bucharest, Romania

The various geometric discontinuities in the structure of the pressure equipment components, existing from the initial phase or during their operation, lead to the appearance of stress states that must be evaluated with great precision. Their values can be compared with the load-bearing capacity of the structures or with that established at the time of evaluation. In this way, the future lifetime of the structure or its decommissioning can be determined.
This article considers a geometric discontinuity between three cylindrical elements, with different thicknesses, built from the same material, with a sudden transition between them. The intermediate element is considered a short cylinder. The analysis of the continuity of the radial and angular deformations, the deduction of the connection loads and the subsequent evaluation of the developed stresses under the action of the existing external loads are accepted.

  • Design of Digital Control System for Line Following Robot
    Dr. Mohanad ABDULHAMID1
    1Al-Hikma University, Iraq

Design of mobile robots has become an increasingly growing trend in the technology of modern times. They are very attractive engineering systems, not only because of many interesting theoretical aspects concerning kinematics, intelligent behavior and autonomy, but also because of applicability in many human activities. A typical example is the line following robot (LFR). In order for a LFR to function effectively, it must demonstrate excellent line tracking control. This is achieved by having accurate and responsive control algorithms as well as high precision color sensor systems. This paper proposes a system to show that good line tracking performance can be achieved with moderately simple digital control algorithms. The platform used is a differentially driven wheeled robot constructed using the Lego Mindstorms components. The simulation models are presented and analyzed using MATLAB Simulink. The main programming environment is the EV3 Software.

  • Precipitation Anomalies Characterization in Papalotla River Basin and Their Implications for Territorial Planning
    PhD Rodrigo ROBLERO-HIDALGO1, M.Eng. Margarita Elizabeth PRECIADO-JIMÉNEZ1, PhD Maritza Liliana ARGANIS-JUÁREZ2, M.Eng. Julio SORIANO-MONZALVO1, M.Eng. José Avidan BRAVO JACOME2, M.Eng. Yaridalia RAMÍREZ-ABUNDIS2
    1Mexican Institute of Water Technology IMTA, Mexico
    2National Autonomous University of Mexico UNAM, Institute of Engineering, Mexico

This paper focuses on calculating the monthly anomaly of precipitation using a straightforward methodology based on average monthly values and drought categorization. The specific case study conducted in this study pertains to the Papalotla River subbasin, which is a part of the Texcoco Lake basin. The research findings reveal that anthropogenic activities, particularly land use change, have had a detrimental impact on the environmental balance of the region. These activities have resulted in several negative consequences such as soil degradation, loss of biodiversity, and environmental pollution. Additionally, the utilization of water resources upstream has led to a reduction in runoff, further exacerbating the environmental challenges faced by the subbasin. Overall, the research highlights the significant disturbances caused by human activities in the Papalotla River subbasin. These disturbances have disrupted the natural area equilibrium, leading to adverse environmental effects.

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