Ruslan Deineha

The object of research is coupled longitudinal-torsional vibrations of the drill string in a vertical well during the circulation of the drilling fluid. The research is aimed at taking into account the distributed mechanical and hydrodynamic coupling, which is not described only by the conditions on the bit. Based on the Green-Lagrange tensor, the third-order Murnaghan potential and Hamilton's principle, nonlinear equations of motion of the section and conditions for combining sections were obtained. The geometric and material nonlinear terms of the second order were preserved in the equations. Hydrodynamic loads were determined for laminar axisymmetric quasi-stationary Herschel-Bulkley fluid flow in a concentric annular space. The numerical implementation was created using Python and Modelica using the method of lines and two-dimensional interpolation of previously calculated loads. For a two-section string 654 m long, calculations were performed with axial excitation of 6 mm amplitude at frequencies of 5 and 50 Hz. At 5 Hz in a section at a distance of 353 m from the lower end of the string, the root mean square deviation of the angular velocity for the model with a linearized mechanical part and preserved hydrodynamic coupling was 91.4% of the result of the full model, and for the mechanically nonlinear variant without cross-hydrodynamic coupling – 29.3%. At 50 Hz, the results of the full model and the variant without cross-hydrodynamic coupling were close, while the linearization of the mechanical part reduced the torsional response. At 5 Hz, the maximum root mean square deviation of the angular velocity along the string without hydrodynamic loads was about 31% of the maximum for the Herschel-Bulkley fluid. Therefore, the influence of coupling mechanisms depends on the excitation mode. The model creates a computational basis for evaluating the accompanying torsional vibrations and internal dynamic forces when choosing the parameters of the axial excitation of the string.

Lifting structures are critical components in the automotive industry, yet their excessive weight and bulk often impede mobility and ease of use. This paper presents a comprehensive study on the structural optimization of a scissor lift, focusing on the topological redesign of its lever. The primary objective is to achieve significant mass reduction while preserving structural integrity, load-bearing capacity, and safety. The core hypothesis is that strategic topological modifications can induce favorable stress redistribution, leading to material savings without compromising safety margins. The research methodology, implemented in the spring of 2024, was based on numerical modeling using the Finite Element Method (FEM) in Ansys Workbench. Numerical analysis of the base lever identified a maximum equivalent stress of 152 MPa, corresponding to a safety factor of 2.27. The proposed optimizations yielded a new lever topology that reduces the component’s mass by 39% (to 35 kg) while maintaining a high safety factor of 1.52 under a maximum stress of 226.5 MPa. The results confirm that the proposed design approach successfully enhances the lift’s performance-to-weight ratio, offering a viable solution for developing more efficient and portable automotive lifting equipment.

Сучасна енергетика та промисловість, що генерують значні викиди парникових газів (зокрема СО2) унаслідок спалювання викопного палива та хімічних процесів, стикаються з проблемою глобального потепління та зміни клімату. Натомість стратегія низьковуглецевого розвитку передбачає зменшення викидів, перехід на відновлювані джерела енергії та використання технологій уловлювання та зберігання СО2.Ця стратегія передбачає відокремлення СО2 від промислових газів (хімічною абсорбцією, адсорбцією, мембранним поділом, кріогенним охолодженням) та його закачування у глибокі геологічні формації для стабільного довготривалого зберігання. Закачаний СО2 може також використовуватися для підвищення нафтовилучення шляхом збільшення тиску у пласті.Крім того, для вирішення проблеми високої вартості та складності існуючих методів уловлювання СО2 та інших парникових газів (як-от пари води), які відіграють найбільшу роль у парниковому ефекті, пропонується новий спосіб видалення води та шкідливих домішок з димових газів підприємств переробки мінеральної сировини. Цей метод ґрунтується на охолодженні димових газів за допомогою багатосоплового пристрою (який використовує сопла Лаваля для розгону потоку), конденсації водяної пари й уловлюванні конденсату сепараторами. Сопло Лаваля забезпечує інтенсивне охолодження газу за рахунок ефекту Джоуля-Томсона при розширенні.В роботі представлено тривимірну конструкцію багатосоплового пристрою, проведено її імітаційне моделювання (з урахуванням складу димового газу, що включає азот – 28 %; воду – 11 %; вуглекислий газ – 22 %; кисень – 9 %; повітря – 30 %, та оптимізацією сітки скінченних елементів) та експериментальні випробування на димовому газі підприємств переробки. Установка охолодження складається із соплового охолоджувача, буферної камери та сепараторів.Моделювання й експерименти підтвердили здатність пристрою знижувати температуру газового потоку (з 120 °С до 70 °С за моделюванням та з 115 °С до 72 °С за експериментами), демонструючи при цьому двоступеневе охолодження. Розбіжність між результатами моделювання й експериментами є незначною. Результати дослідження вказують на доцільність подальшої оптимізації конструкції для підвищення її ефективності, зокрема, для зменшення нагрівання газової суміші після першої стадії охолодження. Пропонований спосіб дозволяє мінімізувати енерговитрати, зменшити габарити та спростити конструкцію обладнання.

Object of the research is a deformation recorder designed for monitoring the stress-strain state of main pipelines. This study investigates the hypothesis regarding the feasibility of installing a deformation recorder on a pipeline section that has been preloaded with the maximum allowable operating pressure, in order to ensure the recorder’s reliable performance under various pipeline operating conditions. Structurally, the examined deformation recorder consists of two clamps, with four longitudinal strain multipliers mounted at diametrically opposite locations between them. By comparing their relative strain values, it is possible to determine the spatial curvature of the pipeline axis. A 3D model of a pipeline section with a diameter of 270 mm and wall thickness of 5 mm was developed, incorporating a deformation recorder with a measurement base of 300 mm. Based on this model, a multi-step finite element model was created to calculate the stress-strain state and the contact interaction of a 4.6-meter-long pipeline section. One end of the pipeline was modeled as axially compliant, and the stress recorder was installed on it. Series of numerical experiments were conducted to analyze the stress-strain behavior of the assembly under varying preload forces of the clamp bolts. The results confirmed the initial hypothesis and allowed the determination of an acceptable preload range. Specifically, the preload force must be no less than 15 kN to ensure secure attachment of the clamps on a non-operational pipeline, and must not exceed 30 kN to comply with the pipeline’s strength requirements. Based on the analysis, recommendations were made regarding the development of a redesigned clamp lock. Additionally, the study proposes that changing the material of the deformation recorder may reduce the required bolt preload force.

The development of various machines and equipment containing parts or assemblies made of hyperelastic materials (e.g., rubber, silicone) is difficult because of the intricacies involved in the description of their mechanical properties. This is especially seen in calculations using simulation...

Various technologies and equipment are used to reduce greenhouse gas emissions. For example, the method of adsorption is used to capture carbon dioxide (CO2) from the smoke emissions of cement industries. In the adsorption process using zeolites, devices such as adsorbers are typically employed....

Today, gas-liquid separators are usually used for the purification of gas mixtures from droplet liquid, and there are many designs of which. However, in order to improve the efficiency of their work, increase throughput, reduce mass and dimensions, they are constantly being improved. Usually, developing a new or improving an existing separator design is a long-term and relatively expensive process. Today, computer programs that implement the finite element method make it possible to speed up and reduce the cost of designing both a gas separator and other equipment. FloEFD program is one of these programs. However, it is more convenient during design to use one computer program that allows you to build 3D models (CAD) and in the same program to use a module for simulating the movement of gas and liquid flows (CFD). Such a program is SolidWorks with the FlowSimulation application module. As for the physical processes that occur during the operation of gas separators, they are quite complex, since a multiphase gas flow with an existing liquid phase is simulated. In the article, simulation modeling of the C-2-1 separator was carried out and the values and distributions of velocities and pressures in its various cross-sections were determined. Special attention was paid to the following cross-sections of the separator: along the axis of its inlet pipe; in the middle is the spigot of the blade screw; on a block of blinds. The difference in pressure at the outlet and inlet of the separator was determined, which is 20267 Pa. Based on the simulation results obtained, recommendations are given for further research and optimization of the separator design. The main parameter that characterizes the degree of separation of liquid from gas in the separator is the efficiency factor, which depends on the design of the separator, thermobaric conditions, parameters of the technological scheme, composition and physical and chemical properties of the gas-liquid flow. As a result of simulated modeling of the separator, its efficiency coefficient was determined when it extracted droplet liquid from the gas-liquid mixture in its various fractions (from 0.01 to 0.1 mm). The efficiency factor is about 100%.

Purpose: The purpose of this study is to explore the optimization of support structures for horizontal pressure vessels using simulation modeling. The research aims to reduce the mass of the support while ensuring structural integrity and identifying opportunities for future improvements in materials and design. Design/methodology/approach: The research was conducted by creating a three-dimensional support model in SolidWorks, compliant with GOST standards. The stress–strain behavior and optimization of the support structure were analyzed using SolidWorks’ Simulation module, which employs the finite element method (FEM). Non-uniform load distributions, such as sinusoidal and parabolic loads, were applied during the loading process to enhance the accuracy of the simulation without incorporating the vessel body itself. Findings: The simulation results showed that optimizing the support structure led to a 15% reduction in its mass. Even though this also resulted in a 23% increase in equivalent stresses in critical areas, the support structure remains safe to operate, with a strength reserve factor under static loads exceeding 2. Research limitations/implications: Further research should include simulations that account for the type and properties of connections between elements, particularly weld calculations. Additionally, future studies could explore the use of higher-grade steels than the tested 09G2C steel to achieve further mass reductions, provided the cost is justifiable. Practical implications: This study is particularly relevant for the design of pressure vessel supports used in vehicles, trailers, and semi-trailers transporting liquids or liquefied hydrocarbon gases. Reducing the mass of support structures can increase payload capacity, offering significant commercial benefits in transportation efficiency. Social implications: A lighter, optimized support structure can contribute to more fuel-efficient transportation of liquid and gas materials, thereby reducing the environmental impact of logistics operations. Originality/value: The originality of this study lies in the combined use of topological and parametric optimization techniques for modeling horizontal pressure vessel supports. The paper provides valuable insights into how simulation-based optimization can lead to significant mass reductions while maintaining structural safety. This research is particularly useful to engineers and designers working on pressure vessel supports for transportation applications. Keywords: pressure vessel, tank, tank support, simulation modeling, topological optimization, parametric optimization.

Purpose. Development of a method for simulating the screwing torque/moment and researching the design of double-shoulder threaded joints while preserving their geometric parameters. Determination of the optimal length of the additional shoulder pin part for the developed drill collar (DC) of NC50, NC55 type of various standard sizes. Establishing the dependence between the pin part length of the additional shoulder and other geometric parameters of the double-shoulder joint of the DC for further use when developing other standard sizes of similar design threads. Methodology. The development of design and the method for simulating the screwing torque of double-shoulder threaded joints was carried out using the finite element method and parametric modeling. Finding. A method for simulating the screwing torque of threaded joints was proposed and developed, which made it possible to improve the model of their automated design. The optimal lengths of the pin part of the additional shoulder of the developed design of double-shoulder threads of the NC50, NC55 types were determined. For planning threaded joints of similar design with the above-mentioned types of threads, a dimensionless coefficient was derived and its value was calculated. A nomogram was built to determine the length of the joint additional shoulder pin part due to the value of this coefficient. Originality. The model of automated design for double-shoulder threaded joints of drill string parts has been improved. This model preserves their geometric parameters and enables modeling a wide range of standard sizes of similar joints. Practical value. The optimal geometric parameters of the developed structures of double-shoulder threaded joints of the drill string elements were determined. A nomogram was built to determine the length of the additional shoulder pin part of the joint by the value of the dimensionless coefficient.