rss_2.0Strojnícky časopis - Journal of Mechanical Engineering FeedSciendo RSS Feed for Strojnícky časopis - Journal of Mechanical Engineeringícky časopis - Journal of Mechanical Engineering Feed Studies on the Dynamics of the Movement of Cleaning Pigs Through Tee Pipe Fittings<abstract> <title style='display:none'>Abstract</title> <p>Experimental setups using steel and transparent glass pipes, along with equally spaced steel stamped and transparent plastic tees, were designed for testing. The experimental results provided insights into the influence of flow directions, pig length, material properties, and air consumption on the dynamics and strength of the pigs within the tees. Furthermore, the study identified the causes of temporary halting, jamming, and the mechanisms of damage to cylindrical pigs made of hyperelastic materials within pipeline tees.</p> </abstract>ARTICLEtrue of the Water Balance of a Green/Blue Roof Supporting an Ecological Cycle<abstract> <title style='display:none'>Abstract</title> <p>In our article, we set out the inspection of the control shafts of the green or blue roof drainage equipment aim. The height of the water formed on the roof through the differently shaped holes on the devices we want to specify the amount of water flowing through per unit of time. In the first case, the water level is constant, and in the second, the height of the water decreases or increases continuously.</p> </abstract>ARTICLEtrue of Synthesis Gas with the Constant Amount of Inert Gases in the Microcogeneration Unit Engine<abstract> <title style='display:none'>Abstract</title> <p>In the scope of the green energy and climatic changes waste poses as a great resource as an alternative fuel or source for their production. This helps to decrease the need for fossil resources, as well as diversify energy production. This kind of waste utilization and mitigation therefore directly fits into latest legislation and green initiatives. This paper focuses on the influence of five synthesis gases with relatively high heating values on the internal parameters of the internal combustion engine intended for cogeneration. Measurements show that proportion of the hydrogen in the mixture has indirect influence on the combustion duration and also maximal pressure rise rate. Interestingly hydrogen proportion in fuel showed no direct influence on the maximal in-cylinder pressure. Higher CO to CH<sub>4</sub> ratio reduced burn time and increased maximal combustion pressure with slightly decreased performance. Concentration of CH<sub>4</sub> directly influenced volumetric <italic>LHV</italic> value of the mixture with subsequent influence on the <italic>IMEP</italic> and engine effective torque. Generally, operation of the engine at full load at 1500 min<sup>−1</sup> on chosen mixtures compared to the runs on methane showed decrease of engine torque output of up to 13.4% and increase of the hourly fuel consumption from 1.56 for pure methane to maximally 3.87 kg.h<sup>−1</sup> for measured gases. Lastly, for one of the fuels erratic engine operation was observed.</p> </abstract>ARTICLEtrue of Reduced-Order Model to Design of Electric Powertrain Rubber Mount<abstract> <title style='display:none'>Abstract</title> <p>This paper deals with possibilities of utilizing neural networks in reduced order modelling. First section of the paper contains theory on reduced order models and their implementations. Following this, subsequent chapter contains methodology concept for obtaining sufficient amount of data and creating reduced order models as well as their evaluation process. Next section describes our findings and summarizes them. Conclusion describes further steps we plan to take in this research.</p> </abstract>ARTICLEtrue in Technical Systems<abstract> <title style='display:none'>Abstract</title> <p>In accordance with modern world trends in the field of higher education, technical creativity and a creative approach are gaining more and more importance as a system-forming factor of an effective educational process. Ensuring the proper level of study of modern methods of finding new technical solutions for the creation of new objects of technology in some places requires making fundamental changes in the educational process of domestic institutions of higher technical education. At the same time, such approaches are useful both for achieving the practical orientation of engineering education and for providing optimal conditions for the research activities of students of various levels.</p> </abstract>ARTICLEtrue the Technology of Cleaning Cutting in Forest Areas with Double-Row Plantings<abstract> <title style='display:none'>Abstract</title> <p>The article discusses the issues of logging in forest areas after artificial reforestation with a double-row arrangement of forest plantations. A critical review of existing methods for carrying out selective and clear cuttings of forests was carried out. The purpose of the study is to develop a method for felling trees with a double-row arrangement of growing trees, allowing felling without damaging neighboring trees and trees in nearby rows. As a result of the research, a modernization of the forestry tractor was proposed.</p> </abstract>ARTICLEtrue of Bicycle Ball-Type Overrunning Clutch Operation<abstract> <title style='display:none'>Abstract</title> <p>A comparative analysis of well-known literary sources has been conducted to identify and summarize the main shortcomings of existing freewheel ball clutches used in bicycles. The need to improve the operational characteristics of existing clutches in order to completely eliminate ball slippage during transitional modes of operation has been convincingly demonstrated. This is due to the fact that they transmit torque through the frictional forces between the jammed balls and the working surfaces of the semi-clutches.</p> </abstract>ARTICLEtrue with Single-Degree-of-Freedom for the Study of Cutting Vibrations<abstract> <title style='display:none'>Abstract</title> <p>The work includes theoretical analysis of the design of a single-degree-of-freedom cutter-oscillator. An improved design, allowing for the adjustment of mass and overhang length, is proposed. An experimental stand for recording oscillograms of cutting-edge motion is developed. The proposed approach allows the cutter-oscillator operation to be effectively tuned depending on the cutting conditions. The results provide a flexible system for parameter estimation under different cutting conditions.</p> </abstract>ARTICLEtrue Multibody Simulations for Motorcycle Tire Force Analysis<abstract> <title style='display:none'>Abstract</title> <p>This paper examines the use of inverse multibody system simulations, focusing on its application in the automotive industry, particularly in the context of motorcycle dynamics. The study emphasizes the importance of accurately measuring various parameters, including the calibration of sensors and the determination of motorcycle kinematical description and weight distribution to build an accurate vehicle model. The research highlights the significance of the presented method in evaluating tire characteristics through different manoeuvres, such as ride resistances, longitudinal and lateral behaviours, and their combined dynamics. The results presented, demonstrate the correlation between the calculated tire forces and the motorcycle’s acceleration during these manoeuvres. However, the study acknowledges challenges, such as potential inaccuracies due to the rider’s movements and the limitations associated with sensor error and noise. The paper suggests potential remedies discussed in earlier research, urging further investigation into improving measurement accuracy and reliability in inverse multibody system simulations for motorcycles.</p> </abstract>ARTICLEtrue Stability of an Inclined Fluid-Conveying Pipe with a One-Sided Elastic Support<abstract> <title style='display:none'>Abstract</title> <p>Pipeline transport is proven to be an efficient method for conveying fluids over long distances, offering benefits such as continuous transport, significant volume capacity, lower energy costs, and substantial environmental advantages. Damage to pipelines could have detrimental effects on the economy, the environment, and pose health and safety risks for the population. The safety issues associated with pipes garner considerable attention in both scientific research and industry. The focus of the current study is on the dynamic stability of a straight fluid-conveying pipe with an elastic support. The investigation is based on the Euler-beam model and involves the use of Laplace and Fourier transformations. The paper draws attention to the stability of inclined pipes, as they haven’t received much attention.</p> </abstract>ARTICLEtrue Rehabilitation is a Promising Area for Increasing Hydrocarbon Production<abstract> <title style='display:none'>Abstract</title> <p>This article provides a general description of the potential for increasing hydrocarbon production in Ukraine through the restoration of oil and gas wells by drilling sidetracks, based on an analysis of the fields resource potential. The main factors for selecting candidate wells for sidetracking are described. Each stage of well selection set during the design and direct drilling operations is supported by practical results. The main technical and technological solutions for well rehabilitation are described, taking into account the possibility of minimizing the cost of sidetrack drilling. The approaches to selecting and designing a sidetracked well profile are analyzed in detail. The technological scheme for drilling a sidetrack and the layout of the bottom of the drill string are substantiated. An algorithm for calculating the required length of weighted drill pipes and the length of the casing exit for sidetracking is presented. The peculiarities of using drilling fluids for deepening wells with an assessment of the impact on the coefficient of core permeability recovery are presented. The requirements for high-quality well casing are analyzed on the basis of an assessment of the possibility of running the casing in certain areas of sharp changes in the curvature parameters when drilling a well with a small-sized rock-destroying tool. The main functional criteria of the applied buffer systems are characterized and the necessity of using sedimentation-stable dispersion-reinforced grouting systems for high-quality cementing of sidetracks in conditions of small annular gaps is substantiated.</p> </abstract>ARTICLEtrue of FSW and MIG on the Mechanical Properties of Al-Mg-Mn Alloy with Minor Additions of 0.4% Sc And 0.1% Zr<abstract> <title style='display:none'>Abstract</title> <p>The present work focuses on the influence of solid-state welding, namely, friction stir welding (FSW) and arc welding, namely, metal inert gas welding (MIG), on the mechanical characteristics of new lightweight 5 mm thick Al-Mg-Mn alloy plates with the addition of 0.4% Sc and 0.1% Zr. The alloys were fabricated using aluminium with 10% magnesium, aluminium with 2% scandium, and aluminium with 5% zirconium master alloys in combination with the Al-Mg-Mn alloy- with the help of a stir casting melting technique. The hardness, tensile strength, 3-point bend strength, impact strength and microstructure of the rolled Al-Mg-Mn alloy plates with the addition of 0.4% Sc and 0.1% Zr were examined. Both the mechanical properties of the FSW and MIG weld joints were compared with those of the non-welded plates. The strength of the non-welded Al-Mg-Mn-Sc-Zr alloy plates was greater, than that of the FSW and MIG weld joints. However, the friction stir welded joints exhibited the improved mechanical properties in comparison with those the MIG welded joints due to more refined precipitation. Compared with the non-welded Al-Mg-Mn-Sc-Zr alloy plates, the friction stir welded joint exhibited a 91.6% joint efficiency and a 63.8% metal inert gas welded joint.</p> </abstract>ARTICLEtrue of the Quality Parameters of the Surface Layer of Parts After Machining with Plasma Heating<abstract> <title style='display:none'>Abstract</title> <p>This study aims to improve the technology for processing parts from hard-to-work materials, to study and substantiate the parameters of the plasma-assisted machining processing of surfaces of alloy steel parts to increase processing productivity and ensure the necessary quality of surface layers. Theoretical studies consist in determining the parameters of the thermal field of a workpiece during milling and turning with plasma heating. Experimental studies are based on a study of the interrelationship of the main indicators of machining with factors of preliminary plasma heating allowance.</p> </abstract>ARTICLEtrue of Machinery Components During Their Life Cycle<abstract> <title style='display:none'>Abstract</title> <p>The article deals with determining the operating state of machinery and its components by processing trend characteristics through measuring mechanical vibration, which determine the end of the lifetime cycle of machine components. It focuses mainly on the area of spinning headstocks and proposes a methodology for permanent monitoring of the dynamic behaviour of the bearings of spinning units. The elaborate the methodology for monitoring bearings leads to an increase in the service lifetime of machinery components. It analyses the causes and frequency and time distribution of vibration.</p> </abstract>ARTICLEtrue of Active Magnetic Bearings<abstract> <title style='display:none'>Abstract</title> <p>This article presents a model of rigid rotor supported by active magnetic bearings (AMB). Mathematical formulation of magnetic forces generated by AMB has been developed. Equations of motion of rigid rotor supported by controllable AMB with and without control law are presented. Eigen structure assignment method is used to change the eigenfrequency of mechatronical system. Numerical simulations are compared with experimental measured data. The simulations presented in this paper correspond with measurement.</p> </abstract>ARTICLEtrue Simulation in an Alga Photobioreactor Tested Under Laboratory Conditions<abstract> <title style='display:none'>Abstract</title> <p>For the purpose of efficient algae cultivation, the Photo Bio-Reactor (PBR) must be designed according to the needs of the algae to be cultivated. We performed our experiment with a loop reactor with a total volume of 14 liters. Among other things, the mixing of the gas and liquid phases, the value and change of the light intensity reaching the algae, and the degree of algae deposition on the walls of the equipment depend on the flow caused by the bubble column in the equipment. Using the ANSYS FLUENT simulation environment, we optimized the efficiency of the gas intake that determines the flow.</p> </abstract>ARTICLEtrue for Measuring Forces in Motorcycle Suspension Using a System Based on Analogue Potentiometers<abstract> <title style='display:none'>Abstract</title> <p>This study explores the quest for a more cost-effective and practical method of measuring forces in motorcycle suspension systems by utilizing simple potentiometers as an alternative to sophisticated strain gauges. The research delves into the feasibility of potentiometers to provide accurate and reliable force measurements, offering potential advantages in terms of affordability, accessibility, and ease of implementation. Through empirical testing and verification, this investigation aims to establish potentiometers as a viable and economical solution for enhancing motorcycle suspension performance monitoring and tuning.</p> </abstract>ARTICLEtrue the Efficiency of Mobile Robot Navigation Using Slam with Several Advanced Algorithms and Filters<abstract> <title style='display:none'>Abstract</title> <p>Several algorithms such as A*, Dijkstra, SLAM (Simultaneous Localisation and Mapping) and APF (Artificial Potential Field) were used in this study to create local maps, plan the shortest path, and localize mobile robots. In fact, when compared to the SLAM/APF method, these algorithms achieved a reduction in road length by 1.18 meters. Nevertheless, the SLAM/APF method outperformed the Dijkstra algorithm by reducing navigation time by 7.62 seconds and surpassed the A* method by reducing navigation time by 5.76 seconds.</p> </abstract>ARTICLEtrue of Simply Supported Laminated Composite Plate by Semi Analytical and Finite Element Method for Different Orientation Angles<abstract> <title style='display:none'>Abstract</title> <p>Deflection of simply supported laminated composite plate under transverse load is found out by semi-analytical method (Classical Lamination Theory) and the results are compared with Finite element method using FEA software ANSYS. The equations developed by classical lamination theory for symmetric angle ply and cross ply laminated plate are solved by Navier and Rayleigh-Ritz method. The efficiency of Navier and Rayleigh-Ritz method in solving the problems of symmetric angle ply and cross ply laminated plate are investigated by comparing their results with ANSYS. Percentage error of the results from finite element method with Navier and Rayleigh-Ritz methods are studied and compared. The model is extended to study the effect of orientation angle, number of lamina and length to thickness ratio on the deflection of simply supported composite plates for symmetric angle ply plates of stacking sequence (orientation angle) of [+<italic>θ</italic>/− <italic>θ</italic>]<sub>s</sub> . From the discussion, it is found that the percentage error depends on the variables: number of lamina, thickness of each lamina, orientation angle and mesh size. The significance of these variables in reducing the percentage error is studied by statistical tool: ANOVA and the relationship between these variables are established by regression equation. Statistical analysis is conducted by testing their significance at the 5% significance level. The comparative study and analysis of the percentage errors of the semi-analytical methods with finite element methods in solving the problem of laminated composite plates is essential to study the degree of approximation in the results.</p> </abstract>ARTICLEtrue of Thermal Barriers on the Martensitic Transformation in a Bar Jominy<abstract> <title style='display:none'>Abstract</title> <p>The shape and geometry of a part influence the cooling behavior during a martensitic transformation; an experimental study carried out on a control Jominy bar was compared with other bars fitted with one, two, and three slots; the results show differences in hardness along the specimen, the hardness with a slit and more is greater than the hardness on a sample without a slit, this is valid on the cooled side of the specimen, the further away from the side cooled plus the difference is minimal; the study was completed with a simulation on bars with and without slits, the results of the temperature contours show an acceleration of the cooling on the cooled side of the bars provided with slits; far from the cooled face the influence of the slits is weak.</p> </abstract>ARTICLEtrue