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Journal articles on the topic 'Kinematic and power calculation parameters'
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1
Bekkulov, B., A. Karimov, and U. Kosimov. "Substantiation of device technical parameters of drying reel drive." Bulletin of Science and Practice 4, no. 7 (2018): 210–15. https://doi.org/10.5281/zenodo.1312215.
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The method of calculating the main parameters and the kinematic calculation of the developed device for driving the drying drum for drying the grain is proposed. Calculations were performed in which the power of the electric motor, the length of the drying drum and other parameters were taken into account. All this allowed increasing the efficiency of the drying apparatus. Similar calculations can be used for other drying devices with other parameters.
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Natalia, Hrudkina, Aliieva Leila, Abhari Payman, Kuznetsov Mykola, and Shevtsov Serhii. "DERIVATION OF ENGINEERING FORMULAS IN ORDER TO CALCULATE ENERGY-POWER PARAMETERS AND A SHAPE CHANGE IN A SEMI-FINISHED PRODUCT IN THE PROCESS OF COMBINED EXTRUSION." Eastern-European Journal of Enterprise Technologies 2, no. 7 (98) (2019): 49–57. https://doi.org/10.15587/1729-4061.2019.160585.
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The possibilities of using and embedding kinematic trapezoid modules with curvilinear boundaries of different shapes were explored. Based on the energy method, the generalized formulas for calculating the power of deformation forces inside the axial trapezoidal kinematic module were derived. Different types of selecting the functions that describe a curvilinear boundary of the axial trapezoidal module were identified. We have analyzed the possibilities of using known techniques for the linearization of integrand dependences in order to calculate the power of deformation forces when it is impossible to obtain a given magnitude in the form of an analytical function. The ways to derive engineering formulas for the computation of components of reduced pressure inside an axial trapezoidal kinematic module were proposed. Based on the energy method, we obtained formulas for the calculation of a step-by-step change in the shape of a semi-finished product under assumption within the axial trapezoidal kinematic module. We modeled the process of combined extrusion of hollow parts with a flange and established regularities in shape formation depending on geometrical parameters. The data about a step-by-step change in the shape of a semi-finished product during deformation were obtained. A comparative analysis of calculation schemes for the rectilinear trapezoidal kinematic module and with a curvilinear boundary under assumption within the studied module was performed. It was confirmed that the reported ways for obtaining engineering formulas, as well as the algorithm for the calculation of processes of combined extrusion that is based on them, simplify the development of technological recommendations. This applies both to determining the force mode of extrusion and preliminary assessment of a change in the shape of a semi-finished product with the possibility to control a metal outflow in the process of deformation
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ZHABIN, ALEKSANDR, VIKTOR MERZLYAKOV, PAVEL CHEBOTAREV, and VLADIMIR SARYCHEV. "CALCULATION OF THE SCREW CONVEYOR OF THE MIXED GROUND SHIELD TUNNEL BORING MACHINES." News of the Tula state university. Sciences of Earth 1, no. 1 (2023): 211–23. http://dx.doi.org/10.46689/2218-5194-2023-1-1-211-223.
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Vasilenko, V. N., A. S. Sidorenko, A. N. Veretennikov, and A. V. Yarygin. "Program realization of the kinematic and power calculation of a four-stroke engine." Proceedings of the Voronezh State University of Engineering Technologies 80, no. 4 (2019): 69–74. http://dx.doi.org/10.20914/2310-1202-2018-4-69-74.
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The development of the algorithm and software for the automation of kinematic and force calculations of the crank-slider mechanism (KPM). The program allows you to automatically demonstrate the operation of the PMC on the display screen after entering the initial data, obtain images of the vector defined kinematic and dynamic parameters associated with a given position of the mechanism, and read the modules and values determining the directions of the calculated parameters from the screen. Special attention in the development of software was paid to the convenience and ease of working with a computer, taking into account the relatively low level of readiness of the majority of students to perform such actions on a computer. In order to ensure this, an interactive input mode is provided. The unification of the original KPM scheme also contributes to this. Such an approach required additional agreement of the compared results, taking into account the spatial location of the calculated part of the mechanism, given the reference system of the angular position and direction of rotation of the crank. The developed program has the following applications: demo, training, testing and analyzing. The demonstration option is used in cases where it is necessary to clearly understand the kinematic interaction between the links of the mechanism and to consider the peculiarities of movement of the links and points of the PMC. The capabilities of the training mode are determined by analyzing the characteristics and types of movement of individual units and characteristic points of the mechanism under consideration and its analogues that arise when one or more parameters change. When using the verification option, it is possible to reliably monitor the calculations performed and the results obtained. In the analyzing variant, it is assumed, on the one hand, to analyze the nature of the qualitative and quantitative changes in the parameters of interest to us in the individual conjugate parts of the mechanism, and on the other, to trace the change in the corresponding kinematic and force parameters depending on the initial data and the position of the mechanism.
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Selivonchik, N. M., and N. L. Nesterenko. "Power Calculation of Anti-Driveaway Crane Device from Eccentric and Wedge Mechanisms." Science & Technique 22, no. 2 (2023): 113–18. http://dx.doi.org/10.21122/2227-1031-2023-22-2-113-118.
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To carry out a power calculation of the anti-driveaway device (AD) of lifting cranes operating in the open air, it is necessary to know the conditions that ensure their reliable stop and fixation on rails, as well as kinematic parameters, namely, the speed and acceleration of cranes when they move along the rails under the influence of the wind force. The considered AD for stopping cranes driven away by the force of the wind uses a tong gripper driven by an eccentric mechanism.The paper presents the calculation of the forces arising during the operation of the tong gripper, considering the possibilities of various types of friction on the contact surfaces both in the absence of lubrication and in its presence. The calculations of the eccentric mechanism as one of the fundamental mechanisms of the anti-driveaway crane device are presented in the paper. The stronger the wind force, the more due to the kinematic connection of the two mechanisms, when turning the eccentric mechanism, the pressure of the tong mechanism increases on the side faces of the head of the crane rail. The constructive solution of the AD excludes any actions of the personnel and makes it automatic.
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LASHKOV, V. A., S. G. KONDRASHEVA, and D. A. KHAMIDULLINA. "EVALUATION OF FLAT-BELT TRANSMISSION PARAMETERS CALCULATED IN THE APM TRANS MODULE OF THE APM WINMACHINE SYSTEM UNDER VARYING KINEMATIC CONDITIONS." Herald of Technological University 27, no. 4 (2024): 110–15. http://dx.doi.org/10.55421/1998-7072_2024_27_4_110.
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An analysis was made of the flat-belt transmission parameters calculated in the APM Trans module of the APM WinMachine system. In the calculation methodology, traction capacity (reliability of adhesion of the belt to the pulley) and durability, determined by the fatigue strength of the belt, are taken as criteria for transmission performance. In accordance with this, the design calculation is made for traction capacity depending on the operating conditions of the transmission (with changing gear ratios), and the verification calculation is made for durability. Analysis of the calculation results shows that the geometric parameters of the flat belt transmission and the force dependencies for the calculated belt thicknesses did not change at the given gear ratios. In this case, the calculated belt thicknesses are the determining parameters in the recommendations for choosing the minimum diameters of the drive pulleys. To organize the operation of the transmission, it is necessary to ensure pre-tension of the belt, while the driving and driven branches will experience the same force. The results of calculating the power parameters of the transmission show that with an increase in the transmission ratio, the pre-tensioning force and the load on the shafts and supports decrease. After applying the transmitted working load, a redistribution of tension occurs in the belt branches: when the flexible element runs around the drive pulley, its tension decreases, and on the driven pulley it increases. The force parameters were calculated using recommendations taking into account the equilibrium of the pulleys and Euler's equations. Calculations have established that various physical approaches at a certain friction coefficient and sliding arc length give comparable results (relative error no more than 2.4%). A durability test based on the results of a computer calculation revealed that the maximum stresses of the belt endurance limit were exceeded (the strength of the flexible element depends on the thickness and width of the belt). It is shown that in order to meet the strength condition, it is necessary to make adjustments to the design calculation: take the belt width from a number of standard sizes in the direction of increasing values. Strength calculations based on adjusted geometric dimensions determined the areas of use of flat belt drives.
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Chajkin, A. P., R. Yu Dobretsov, V. A. Sokolova, et al. "Mechanisms of power distribution: principles of kinematic and force analysis." Journal of Physics: Conference Series 2094, no. 4 (2021): 042019. http://dx.doi.org/10.1088/1742-6596/2094/4/042019.
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Abstract The article considers the features of performing kinematic and power analysis of a controlled power mechanism for the transmission of wheeled transport and transport-technological machines. Such mechanisms are currently used mainly on cars in order to improve handling, stability, traction and dynamic properties in severe road conditions. Such mechanisms are not produced in Russia, but theoretical studies are currently being conducted, the results of which will allow determining the main parameters of the mechanism and synthesizing its kinematic scheme. The proposed approaches are based on the methods used in the kinematic and force analysis of planetary gears, but it is taken into account that the mechanism of power distribution during operation has two degrees of freedom. It is indicated that there is a structural and functional similarity between the power distribution mechanism of the car and the turning mechanism of the tracked vehicle. A method is proposed for calculating the gear ratio of the power distribution mechanism according to the condition of matching the minimum possible turning radius provided by the steering trapezoid kinematics and the calculated turning radius.
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Chasov, D., V. Beihul, V. Molchanov, B. Kolyada, V. Bobrov, and O. Tarasiuk. "INVESTIGATION OF THE PARAMETERS OF THE COMBINED CRUSHER WITH SCREW CONVEYOR." Collection of scholarly papers of Dniprovsk State Technical University (Technical Sciences) 2, no. 41 (2022): 83–88. http://dx.doi.org/10.31319/2519-2884.41.2022.9.
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The object of the study is the study of the process of grinding metal shavings during transportation by a screw conveyor under the condition of using a common drive in order not to increase energy consumption.In the process of work, a fundamentally new scheme for grinding drain chips and chipping chips was proposed, a calculation scheme of a knife crusher was developed, the kinematic scheme of which uses the involved torque of the conveyor drive thanks to the power take-off shaft in order to save energy consumption and resource conservation when not using a separate energy source.The analysis of the research results showed that in domestic and foreign mechanical engineering, there is little information and recommendations for the design and calculation of equipment for chipping during transportation, especially for chipping waste chips of high-alloy, stainless steels and titanium alloys, as well as insufficiently researched technologies for using a common power source for several different additional operations of auxiliary equipment of mechanical industries and enterprises.The work presents theoretical studies on determining the action of moments in different planes, which determine the components of the work, additional coefficients and calculated power of the drive to meet the needs of the crusher. Recommendations are given for the design, calculation and industrial use of knife crushers.Using the developed methods and recommendations, the calculation of all the necessary elements of the complex system of transportation and processing of chips for the conditions of mechanical enterprises was carried out in accordance with the scientific study within the state budget research work "Development and improvement of technological equipment for operating systems of lubricating and cooling fluids of metal cutting machines, taking into account environmental efficiency of processes of transportation, cleaning and processing of technological environments" of the Dnipro State Technical University.The use of the described methodology allows you to use engineering calculations to solve the technological problems of designing and constructing equipment in agrotechnical and agricultural areas.
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Brkić, Dejan, Pavel Praks, Renáta Praksová, and Tomáš Kozubek. "Symbolic Regression Approaches for the Direct Calculation of Pipe Diameter." Axioms 12, no. 9 (2023): 850. http://dx.doi.org/10.3390/axioms12090850.
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This study provides novel and accurate symbolic regression-based solutions for the calculation of pipe diameter when flow rate and pressure drop (head loss) are known, together with the length of the pipe, absolute inner roughness of the pipe, and kinematic viscosity of the fluid. PySR and Eureqa, free and open-source symbolic regression tools, are used for discovering simple and accurate approximate formulas. Three approaches are used: (1) brute force of computing power, which provides results based on raw input data; (2) an improved method where input parameters are transformed through the Lambert W-function; (3) a method where the results are based on inputs and the Colebrook equation transformed through new suitable dimensionless groups. The discovered models were simplified by the WolframAlpha simplify tool and/or the equivalent Matlab Symbolic toolbox. Novel models make iterative calculus redundant; they are simple for computer coding while the relative error remains lower compared with the solution through nomograms. The symbolic-regression solutions discovered by brute force computing power discard the kinematic viscosity of the fluid as an input parameter, implying that it has the least influence.
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Wang, Shuze, Zeyu Wang, and Xintong Huang. "The design and analysis of flapping wing mechanism based on eccentric crank slider." Highlights in Science, Engineering and Technology 46 (April 25, 2023): 147–53. http://dx.doi.org/10.54097/hset.v46i.7696.
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In order to improve the sharp return characteristics of the flutter mechanism, and then increase the downward power of the flutter aircraft, reduce the drag of the wing upward, and increase the flight efficiency, this paper designs a flutter drive mechanism with sharp return characteristics based on the eccentric crank slider flutter structure. Firstly, the kinematic model of the eccentric crank slider mechanism is established through motion analysis, and then the simulation model of the flutter mechanism is established in SOLIDWORKS to simulate its motion and verify its theoretical analysis. The results show that the designed flutter mechanism has an upper limit angle of 17°, a lower limit angle of -34°, and a travel speed ratio of 1.35, which are consistent with the flight parameters of the selected bionic bird, so it has good aerodynamic performance. And the kinematic parameters obtained from the simulation are consistent with the theoretical calculation, which verifies the correctness of the theoretical calculation.
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S.Z., Bovshovsky, Kuntsman V.A., Babintsev A.A., Shvygar V.A., and Starodubov A.V. "METHOD FOR DETERMINING THE DESIGN OPERATING MODE OF HYDRAULIC POWER STEERING AT THE DESIGN STAGE." ИННОВАЦИОННЫЕ НАУЧНЫЕ ИССЛЕДОВАНИЯ 2023. 3-1(27) (April 8, 2023): 82–95. https://doi.org/10.5281/zenodo.7810500.
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The article presents a methodology for determining the design mode of operation of a hydraulic power steering at the design stage. The technique includes: calculation of the moments of forces acting on the car when turning; determination of power and kinetic parameters of the hydraulic power steering; determination of the driving modes of a car with a hydraulic power steering. The article gives the sequence for determining the most loaded operating mode of the hydraulic power steering. The calculation is made when turning the car at different speeds and in different road conditions. The calculation of the most loaded operating mode of the hydraulic power steering of the car will reduce the complexity of theoretical studies of the hydraulic power steering at the design stage.
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Koval, S. V., A. V. Kuzminov, P. A. Rodin, and N. M. Sidorov. "Dynamic seismic analysis of nuclear power plant buildings and bearing stratum." Bulletin of Science and Research Center “Stroitelstvo” 31, no. 4 (2021): 79–88. http://dx.doi.org/10.37538/2224-9494-2021-4(31)-79-88.
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Various approaches are used for simulating seismic loading and collaboration of a structure and a bearing stratum when carrying out dynamic seismic analysis in specialized software. In the present work, the kinematic parameters of various structures and bearing stratum were calculated using SCAD and STAR_T software. Seismic performance of a reference tower type supporting frame was calculated for 7 grade earthquake. As a result, the floor accelerograms were calculated, and the floor response spectra were built. The calculation results obtained by various methods and structure models were analyzed and compared.
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Lagerev, A.V., V.I. Tarichko, and I.A. Lagerev. "The operation of hydraulic drives with frequency-throttle regulation for mobile rope complexes with the consistent installation of throttles." Nauchno-tekhnicheskiy vestnik Bryanskogo gosudarstvennogo universiteta 6, no. 1 (2020): 73–92. https://doi.org/10.22281/2413-9920-2020-06-01-73-92.
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The article discusses the task of modeling the working hydrodynamic processes occurring in hydraulic drives with frequency-throttle regulation of the mechanisms of movement of traction and load-bearing ropes, at all stages of the movement mechanism - the stage of acceleration of the transported cargo, the stage of steady (stationary) movement with constant speed and the stage of braking when approaching the final breakpoint. As a circuit that implements throttle control, possible hydraulic circuit designs for sequential installation of adjustable throttles relative to the hydraulic motor are considered - one-sided installation of one throttle and two-sided installation of two throttles with the same and different settings. To solve this technical problem, a mathematical model of the hydraulic drive and a computer program that implements it were developed. The model provides a computer simulation over time of the processes of change over time of such basic technical characteristics of the hydraulic drive as pressure and volumetric flow rates of the working fluid at characteristic points along the length of the hydraulic system, pressure drop across the hydraulic motor and instantaneous hydraulic drive power, as well as kinematic and power motion parameters of traction and load-bearing ropes (distance traveled, linear speed and acceleration, required power, overcome operating loads). In relation to a specific variant of the mobile rope complex, the calculations of the indicated hydrodynamic, kinematic and power parameters were carried out, as well as the analysis of the results obtained. The effect of various options for installing adjustable throttles and their settings on the calculation results is shown.
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Shakulikova, G. T., S. M. Akhmetov, N. M. Akhmetov, and Zh U. Iklasova. "Features of mathematical modeling transmission parameters of drilling rigs with planetary gears." Bulletin of the National Engineering Academy of the Republic of Kazakhstan 83, no. 1 (2022): 129–36. http://dx.doi.org/10.47533/2020.1606-146x.148.
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The features of the approach to the mathematical modeling of power transmission parameters of drilling rigs (DR), which include gear planetary gear mechanisms in the kinematic structure, are considered. At the same time, the modeling features consist in the special properties of the kinematics and dynamics of planetary gears, as well as the presence of elements of complex relative motion in them. This circumstance requires a thorough analysis of the parameters at the design stage, which should be based on the use of available and promising methods of mathematical modeling with the possibility of using modern mathematical apparatus and numerical methods of calculations. In order to solve this problem, the authors proposed a method for mathematical modeling of mechanical processes in the transmissions of DR with planetary gears. This makes it possible, based on the results of theoretical studies, to predict the optimal parameters of the power transmission of DR.
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Lagerev, Alexander V., Vadim I. Tarichko, and Igor A. Lagerev. "Modeling operation modes of hydraulic drives with frequency-throttle regulation of mobile transport and overloading ropes complexes." Nauchno-tekhnicheskiy vestnik Bryanskogo gosudarstvennogo universiteta 5, no. 4 (2019): 462–80. https://doi.org/10.22281/2413-9920-2019-05-04-462-480.
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<em>Mobile ropeways, the equipment of which is located on the base chassis of wheeled or tracked vehicles of high carrying capacity, are a promising type of transport and overloading equipment. Specific design features, modes and conditions of their operation in comparison with traditional freight and passenger fixed-line cableways require the development of special design methods and design calculations for this type of machine. The article discusses the problem of modeling working hydrodynamic processes in hydraulic drives with frequency-throttle regulation of the mechanisms of movement of traction and carrying ropes, at all stages of the movement mechanism — the stage of acceleration of the transported cargo, the stage of steady-state (stationary) movement at a constant speed and the stage of braking when approaching the final breakpoint. To solve this technical problem, a mathematical model of the hydraulic drive and a computer program that implements it were developed. The model provides computer simulation of the time-varying processes of such basic hydraulic drive technical characteristics as pressures and volumetric flow rates of the working fluid at characteristic points along the length of the hydraulic system, pressure drop across the hydraulic motor and instantaneous hydraulic drive power, as well as kinematic and force parameters of the movement of traction and carrying ropes (distance traveled, linear speed and acceleration, required power, overcome operational loads). In relation to a specific version of the mobile rope complex, the calculations of the indicated hydrodynamic, kinematic and power parameters were carried out, as well as the analysis of the results obtained. The influence of the adjustable throttle setting on the calculation results is shown.</em>
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Leila, Aliieva, Hrudkina Natalia, Aliiev Igramotdin, Zhbankov Iaroslav, and Markov Oleg. "EFFECT OF THE TOOL GEOMETRY ON THE FORCE MODE OF THE COMBINED RADIAL-DIRECT EXTRUSION WITH COMPRESSION." Eastern-European Journal of Enterprise Technologies 2, no. 1 (104) (2020): 15–22. https://doi.org/10.15587/1729-4061.2020.198433.
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A possibility has been investigated to use an energy method to calculate the energy-force parameters for the cold extrusion processes involving components of complex configuration. A mathematical model has been proposed for the process of combined sequential radial-direct extrusion with compression with the presence of triangular kinematic modules. The use of the triangular kinematic modules with curvilinear and straight-line boundaries has made it possible to describe the sites of intense deformation, which correspond to the steady stage of the deformation process. It has been proposed to apply an upper estimate of the power of forces that deform a kinematic module of the triangular shape of the transition zone from the radial flow of metal to direct extrusion. This has made it possible to derive the magnitude of the reduced deformation pressure in the analytical form as a function of the geometric and technological parameters of the extrusion process. The margin of error, compared to numerical calculations without the use of the upper estimate, does not exceed 0.2‒1 %. The role of an optimization parameter belongs to aÎ(0,1), which is responsible for the shape of the curvilinear boundary of the inner triangular kinematic module. We have derived an analytical expression for the optimal value of the α parameter and analyzed a change in the magnitude of the reduced deformation pressure at different ratios of the process geometric parameters. It has been established that the optimal values of the angle of inclination of the forming mandrel β lie between 20° and 30° for different ratios of the deformation process. It has been justified that the use of combined sequential extrusion in the manufacture of hollow components with a flange, when compared to the application of simple deformation schemes, improves the process technological possibilities. The lack of study of the schemes of the combined radial-direct extrusion process with the compression of components of the type of sleeve, as well as the lack of recommendations for calculating the energy force parameters of the process, have been confirmed. The calculation scheme of a given process, developed on the basis of an energy method, makes it possible to predict the force mode for the steady stage under different technological parameters of the deformation process. The data acquired on the estimation of the optimal parameters for tool configuration would help devise appropriate design and technology recommendations
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Markov, D. P. "Tribology of rail bogie." Vestnik of the Railway Research Institute 77, no. 4 (2018): 230–40. http://dx.doi.org/10.21780/2223-9731-2018-77-4-230-240.
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Railway bogie is the basic element that determines the force, kinematic, power and other parameters of the rolling stock, and its movement in the railway track has not been studied enough. Classical calculation of the kinematic and dynamic parameters of the bogie's motion with the determination of the position of its center of rotation, the instantaneous axes of rotation of wheelsets, the magnitudes and directions of all forces present a difficult problem even in quasi-static theory. The paper shows a simplified method that allows one to explain, within the limits of one article, the main kinematic and force parameters of the bogie movement (installation angles, clearance between the wheel flanges and side surfaces of the rails), wear and contact damage to the wheels and rails. Tribology of the railway bogie is an important part of transport tribology, the foundation of the theory of wheel-rail tribosystem, without which it is impossible to understand the mechanisms of catastrophic wear, derailments, contact fatigue, cohesion of wheels and rails. In the article basic questions are considered, without which it is impossible to analyze the movement of the bogie: physical foundations of wheel movement along the rail, types of relative motion of contacting bodies, tribological characteristics linking the force and kinematic parameters of the bogie. Kinematics and dynamics of a two-wheeled bogie-rail bicycle are analyzed instead of a single wheel and a wheelset, which makes it clearer and easier to explain how and what forces act on the bogie and how they affect on its position in the rail track. To calculate the motion parameters of a four-wheeled bogie, it is represented as two two-wheeled, moving each on its own rail. Connections between them are replaced by moments with respect to the point of contact between the flange of the guide wheel and the rail. This approach made it possible to give an approximate estimation of the main kinematic and force parameters of the motion of an ideal bogie (without axes skewing) in curves, to understand how the corners of the bogie installation and the gaps between the flanges of the wheels and rails vary when moving with different speeds, how wear and contact injuries arise and to give recommendations for their assessment and elimination.
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Chernyavsky, D. I., and D. D. Chernyavsky. "Kinematic calculation of micro mirror elements in micro electro-mechanical systems (MEMS)." Omsk Scientific Bulletin, no. 175 (2021): 5–11. http://dx.doi.org/10.25206/1813-8225-2021-175-5-11.
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Currently, the development and application of micro machines is an important direction in the development of microelectromechanical systems (MEMS) technologies. In these devices, electromechanical energy conversion occurs, as a result of which forces arise that carry out mechanical work within the dimensions of the microcircuit case. The paper considers the kinematic calculation of the design of a micromirror with a reflective layer of high optical quality of the surface for deflecting the reflected laser beam. By changing the angle of inclination of the micromirror, the laser beam enters the various input channels of the optical sensor. In this case, a control signal is generated for the further operation of the microcircuit. Thus, the micromirror performs the function of a switch of input optical channels, connecting in various combinations certain input or output elements of the microcircuit for further processing. The article presents the calculation of the kinematic parameters of the mechanical structure of the micro mirror. Practical recommendations are given for choosing the optimal range of variation of the micro mirror tilt angles in order to increase the strength of its structure, as well as to reduce the power of the mechanical drive of the micro machine required to change the micro mirror tilt angles
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Snezhko, A. V., and V. A. Snezhko. "Optimization of geometrical parameters of jet drive of cleaning centrifuges." Traktory i sel hozmashiny 83, no. 9 (2016): 23–28. http://dx.doi.org/10.17816/0321-4443-66203.
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Centrifuges with hydrojet drive were widely used in 1960-70 for oil cleaning in the engines. Nowadays some foreign companies apply them together with filters for oil cleaning in engines of vehicles and tractors. The most complex challenge in designing such centrifuges is the calculation of parameters of nozzle diaphragm. Its optimal solution depends on the specific technical requirements to separator under designing. Research objective is to substantiate the optimal geometrical parameters of hydrojet drive of cleaning centrifuges, and to develop its calculation method under different conditions of designing. Design parameters of hydrojet drive, such as nozzle diameter and its reactive arm, are calculated according to the condition of dynamic balance between the drive moment created by the liquid from nozzles, and the moment of resistance to rotation at the stable motion. Design, kinematic and power parameters of nozzle diaphragm that provide the driving kinetic moment of liquid are analyzed. The factors influencing on rotational resistance are determined. As a result, the equation of balance of specific energies is received: the energy spent for overcoming of rotational resistance, and the motive energy of fluid flow developed by hydrojet drive. The analysis of this equation allows to determine the optimal reactive arm and nozzle diameter. Formulas for calculation of minimal fluid consumption in hydrojet drive that provides the specific angular speed of rotor and the parameters of nozzle diaphragm corresponding to this consumption are received. With optimal design parameters of hydrojet drive, the coefficient of utilization of flow energy is maximal. The expression for calculation of the maximal efficiency coefficient of hydrojet drive is obtained. Results of theoretical researches are presented in graphic form. Design charts of optimal values of flow rate of liquid from nozzles, circumferential speed of nozzles, reactive arm, and also efficiency coefficient of hydrojet drive with its optimal parameters are given. A method and solution algorithm of two problems of hydrojet drive design are offered: the calculation of optimal design parameters of nozzle diaphragm for ensuring the maximal rotating speed of rotor, and also the calculation with the minimal power consumption of drive.
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Kuvykin, V. I., A. V. Kolpakov, and M. A. Meleshkevich. "Viscosity Mixtures Modeling in Optimal Planning Systems." Chemistry and Technology of Fuels and Oils 640, no. 6 (2023): 37–41. http://dx.doi.org/10.32935/0023-1169-2023-640-6-37-41.
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The paper deals with experimental measurements results of kinematic viscosity of processing components mixtures with a focus on the relationship between viscosity and density of a hydrocarbons mixture. It has been developed a technique for adjusting the parameters of the viscosity calculation model in optimal planning systems using the angular cosine distance.Numerical experiments on a refinery optimal planning model are presented.
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Vershina, G. A., L. E. Reut та K. R. Sidorenko. "Саlculation of Cutting Tool Parameters for Production of Split Fluoroplastic Rings". Science & Technique 23, № 6 (2024): 451–60. http://dx.doi.org/10.21122/2227-1031-2024-23-6-451-460.
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The paper considers the technological process of manufacturing fluoroplastic sealing rings, consisting in forced feeding and pulling a polymer tape blank between rotating rollers, plastic bending of the tape in the deformation zone toa given curvature by twisting it on a drive roller and the subsequent operation of cutting off the strip after obtaining a ring of the required diameter. This technology has high productivity due to the automation of the full cycle of manufacturing a split ring and the continuity of the process allowing to minimize waste, reduce the labor intensity and energy intensity of production. The most difficult issue in developing the proposed technology is the design of the working tool, its dimensions and geometry, as well as the power and kinematic parameters of the device that ensure the production of fluoroplastic rings of the required accuracy. The complexity of the issue lies in the fact that fluoroplastic has a number of features that manifest themselves during deformation, and its mechanical behavior under force exposure differs significantly from the behavior of known classical materials. However, unlike other polymers, fluoroplastic is a high-density material and has a structure with a high degree of crystallinity, therefore, as studies show, its behavior under load, as well as the mechanism and sequence of deformations in it, are in many ways similar to the behavior of metals, which allows to use methods and approaches adopted in the mechanics of solid deformable bodies for fluoroplastic. According to the proposed technology, a fluoroplastic tape blank, pulled between rotating rollers and subjected to bending in the deformation zone, experiences pure bending with the occurrence of elastic and residual deformations, of which it is the latter that give the product the necessary shape and ensure the production of a ring of the required diameter. To solve this problem, it is necessary to perform the corresponding force and geometric calculations of the process. Force calculation is aimed at determining the force parameters of bending that create the maximum possible irreversible deformations in the deformed product with the minimum possible elastic recovery (springing) after leaving the deformation zone, and the geometric calculation is aimed at fulfilling force conditions. Based on a study of the stress state during bending of fluoroplastic tape, taking into account the different rigidity of fluoroplastic under tension and compression, as well as the kinematic calculations of the elements of the working unit of the installation, the diameters of the forming roller that creates the necessary bending forces in the deformation zone and the cutting roller-caliber that ensure obtaining a ring of the required diameter are determined. The calculation methods developed by the authors are in fairly accurate agreement with the results of experimental studies.
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Kudzaev, A., R. Kalagova, A. Tsgoev, I. Korobeynik, and T. Urtaev. "Clarification on the soil cutter parameters used for cultivation." IOP Conference Series: Earth and Environmental Science 979, no. 1 (2022): 012193. http://dx.doi.org/10.1088/1755-1315/979/1/012193.
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Abstract The article provides analytical dependences for calculating such important parameters of the cutter for soil cultivation as the number of revolutions of the shaft with the knives fixed on it, the indicator of the kinematic regime, feed to the knife, as well as the power consumed by the cutter. Taking into account the results of research by other authors, numerical calculations were carried out. The following are the results of experimental studies of the process of milling the soil, carried out using a prototype machine. The torque on the drive shaft of the machine was determined using the strain gauge method. To determine the rotational speed of the cutter shaft, optical sensors were used, the translational speed of the machine was determined based on the processing of signals from a speed meter driven by the support wheel of the machine. As a result, it was found that the milling cutter with the values of the parameters determined theoretically provides high quality soil cultivation. The calculated values of the power consumed by the cutter are in good agreement with the experimental results.
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Rekechynsky, Volodymyr. "Application of the method of current functions in stationary plastic deformation processes." Vibrations in engineering and technology, no. 2(97) (August 27, 2020): 157–63. http://dx.doi.org/10.37128/2306-8744-2020-2-17.
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A method of determining the components of the strain rate tensor based on the method of current functions is developed. It is assumed that, with an axisymmetric plastic deformation of the metal in a channel with curvilinear borders, the kinematics of the process are similar to a flat flow. Using the incompressibility equation and the differential equation of the current lines, it is established that the current function maintains a constant value along the current lines. Two infinitely close current lines are considered in the flow plane to explain the kinematic content of the current function. The expression for flow through the finite transverse-sized tube was obtained. In the absence of radial velocity components at the boundaries, we obtain the restrictions imposed on derivatives of the current functions at these boundaries. The method of calculation of kinematic deformation characteristics for established axisymmetric processes will allow to simplify the mathematical processing of the obtained results. Real processes of metal processing are always accompanied by uneven plastic molding, which affects the power and kinematic parameters, the quality of finished products. The main technological factors affecting the appearance of the inhomogeneity and the nature of its distribution are the form factor (geometric parameters of the original workpiece) and the coefficient of contact friction. The study of technological parameters affecting the distribution of non-uniformity of plastic molding will allow to create practical recommendations for reducing the influence of the above mentioned parameters to ensure more uniform plastic deformation. Due to elastic-plastic deformation and local heating, which occur during surface-plastic deformation processing, the stress-strain and physical state of the surface layer is formed. This changes the microgeometry of the surface, the physical and mechanical properties of the surface layer of the workpiece. The surface treated by methods of surface-plastic deformation, has high hardness, residual compression stresses in the surface layer, smoothed out the micro-roughness. Accordingly, increases wear resistance, fatigue strength, resistance to corrosion and more.
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Nhan, TRAN Huu, NGUYEN Ngoc Thanh, VO Ba Khanh Trinh, and NGUYEN Van Nguyen. "Dynamic analysis of small gasoline car model powertrain using MATLAB / SIMDRIVELINE." Science & Technology Development Journal - Engineering and Technology 3, SI2 (2021): first. http://dx.doi.org/10.32508/stdjet.v3isi2.575.
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The powertrain model of a vehicle using a small gasoline engine is designed based on the analysis results of the Matlab/Simdriveline simulation model. In which, the vehicle's powertrain model parts include: engine, clutch, gearbox, differential and wheels, and overall vehicle modeled by Matlab/ Simdriveline. Mathematical basis of the corresponding models for systems or components are used to build simulated models for the entire vehicle's powertrain system. The input parameters for the simulation problem include parameters of the size, mass, structural and technical parameters of each system such as transmission ratio, power, velocity, efficiency, determined based on actual vehicle model and empirical calculations. The simulation calculation process is done on the basis of the variation of the engine power, from which, the corresponding input and output kinetic and dynamic parameters of each system in the powertrain system consists of clutch, gearbox, differential, are obtained in the time domain. The results of simulation calculation of the kinematics and dynamics of each system in the vehicle's powertrain are analyzed as a basis for design improvement to improve the dynamic performance of the vehicle model.
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I., Rehei, Behen B., Ternytskyi S., and Koval T. "DRIVE POWER OF THE EQUIPMENT FOR THE MANUFACTURE OF CORRUGATED BOARD INVOLUTES OF DISTRIBUTION PACKAGING (JUSTIFICATION OF THE CALCULATION METHOD)." Technological Complexes 1, no. 15 (2018): 66–71. https://doi.org/10.5281/zenodo.2669571.
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It has been established that the provision of modern industrial goods by the large-sized distributional packaging of corrugated board is related to the complexity of manufacture of involutes using die-cutting equipment. Large-sized involutes are obtained from several individual by gluing or binding with saddle stitching, that greatly complicates the technological process. A new technological process is proposed to eliminate the drawbacks and the unit for manufacturing large-sized involutes by means of scissor cutting with moving disk tools is developed, driven by a crank-sliding mechanism. In the article has been obtained mathematical expressions for invariants of kinematic parameters, relative instantaneous power, which spent by the unit for the manufacture of the large-sized involute of corrugated board.
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Yu, Fujie, and Yuan Chen. "Trajectory tracking control of an amphibian robot with operational capability." International Journal of Advanced Robotic Systems 16, no. 4 (2019): 172988141986542. http://dx.doi.org/10.1177/1729881419865423.
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Although the traditional amphibious robot has the ability of multi-space motion, it has the disadvantage of low power utilization and no operational capability. In order to make it competent in an extremely complex environment, we studied the structural design and control of amphibian robot with operational capability. First, in order to make the robot have the ability of flying in the sky, moving on land, and swimming in the water, a “bevel variant” mechanism for power switching is designed. Then, taking the uncertainty of the kinetic parameters and external influences into account, the kinetic and kinematic models of the system are established. Next, a sliding mode controller that outputs control force for the system and a quadratic calculation optimization algorithm for inverse kinematics solution are designed. Finally, the simulation platform for the system is built based on MATLAB. The simulation results show that when the system is in the land and air flight stages, the vehicle position and orientation tracking error are within ±0.05 m and ±2°, respectively. When the system is in the underwater stage, the end effector position and orientation tracking error are within ±0.15 m and ±3.0°, respectively.
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Badalyan, Liparit Kh, Vladimir N. Kurdjukov, and Alla M. Ovcharenko. "Assessment of car emission masses at the change of kinetic energy of the “engine – transport vehicle” system." MATEC Web of Conferences 226 (2018): 04041. http://dx.doi.org/10.1051/matecconf/201822604041.
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Negative anthropogenic impact on the environment can lead to global changes in the natural cycle of substances in the biosphere and the climate change in general. Assessment of the mobile sources emission is an important component of the diagnosis of the urbanized landscapes ecosystem state. The effective power of the car engine is accepted as the characteristic unambiguously reflecting the movement of the vehicle. The algorithm of determination of pollutants emission masses is stated in the article and unique calculation of relative effective power of the engine is presented. The current value of the engine effective power taking into account transformation of variable parameters to the coded sizes depending on kinematic and dynamic factors is calculated from the equation of the car movement at the change of kinetic energy of the “engine - transport vehicle” system in the form of Lagrange. Such dynamic characteristics as coefficient of the rotating masses and coefficient of mechanical efficiency of transmission are presented by functions of the engine relative effective power. Results of the research considerably simplify calculation of pollutants emission masses by traffic flow into the atmosphere and can be used for assessment of negative anthropogenic impact on the ecosystem.
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Leontiev, Aleksandr, Vitalii Tauger, Evgenii Volkov, and Volkov Volkov. "The dynamics of a laden skip of the shaft pneumatic winding plant during acceleration." Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal, no. 1 (February 17, 2021): 115–21. http://dx.doi.org/10.21440/0536-1028-2021-1-115-121.
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Introduction. Ratios for calculating the laden skip acceleration and speed at the motion start are required to calculate skip pneumatic winding plant cycle components. The ratios are the solution to the skip dynamics equation which takes into account the relationship between the flow generated by a power unit and air pressure. Research methodology. The dynamics equation including the dependence of the pressure on the flow rate (aerodynamic characteristic) in a general form is compiled. In a special case of the unit’s physical model, a discharge unit with a linear aerodynamic characteristic is used. Research result. For a particular case, equations are obtained that allow to theoretically describe the kinematic parameters of a skip in the period of unsteady motion. It is established that the skip acceleration, velocity and displacement are asymptotic functions. The obtained expressions for kinematic parameters make it possible to theoretically determine the duration of the acceleration period and the path that the ISSN 0536-1028 «Известия вузов. Горный журнал», № 1, 2021 121 skip takes during this period. A method for calculating skip dynamics during acceleration is proposed, which contains approximating formula conclusion for the power unit aerodynamic characteristics, its substitution into the dynamics equation, and obtaining skip kinematic parameters by solving the dynamics equation. Conclusion. The obtained relations allow to calculate skip dynamics during acceleration taking into account power unit aerodynamic characteristics, which is necessary to determine the working cycle time of the pneumatic winding plant.
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Sharkov, O. V., and A. V. Kalinin. "Analytical Evaluation of the Velocity Fluctuation of Pulse Continuously Variable Transmissions." Proceedings of Higher Educational Institutions. Маchine Building, no. 5 (746) (May 2022): 35–42. http://dx.doi.org/10.18698/0536-1044-2022-5-35-42.
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Pulse continuously variable transmissions allow to change gradually the speed and power characteristics of machine drives in motion and under load. When operating such transmissions, the transforming mechanism has the most complex kinematics. It transforms the rotational motion of the input link into the vibrational motion of intermediate links with different amplitudes and frequencies. The article considers the problem of analytical research of the kinematics of the transforming mechanism of a pulsed continuously variable transmission with six free-running mechanisms. To solve the problem, a calculation scheme is proposed and mathematical expressions are obtained for describing the relationship between the geometric parameters of the transforming mechanism and the speeds of the points of its links. The kinematic analysis was performed for the most compact design - a transforming mechanism based on a four-link lever. Graphs characterizing the change in the angular velocity of the output link during the forward and reverse motion of the rocker arm are given. The values of the coefficient of velocity fluctuation are found. It is shown that it is preferable to transfer the rotational motion by free-running mechanisms in the forward stroke.
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Rubio, Francisco, Carlos Llopis-Albert, and Ana M. Pedrosa. "Analysis of the Influence of Calculation Parameters on the Design of the Gearbox of a High-Power Wind Turbine." Mathematics 11, no. 19 (2023): 4137. http://dx.doi.org/10.3390/math11194137.
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As wind turbine power requirements have evolved from the order of kilowatts (kWs) to the order of several megawatts (MWs), wind turbine components have been subjected to more demanding and critical operating conditions. The wind turbine must cope with higher wind loads due to larger blade sizes, which are also time-varying, and, ultimately, higher power levels. One of the challenges in the manufacture of high-power wind turbines lies in the gearbox and consists of achieving ever-greater power density without compromising efficiency, i.e., greater load capacity with lower weight (and production cost) and reduced power losses. Epicyclic geartrains are used to build the gearbox due to various advantages in relation to conventional gear systems, such as higher feasible gear ratios, higher efficiency, compactnesss, and lower weight. In this paper, several epicyclic geartrains with different structures will be analysed to reveal the influence that certain design parameters have on the size and weight of the gearbox components in the selected model and, therefore, of the gearbox itself. For this purpose, the theoretical model of the gearbox will be planned and the influence of the calculation parameters on the gearbox design will be analyzed following ISO 6336. Special emphasis is placed on the influence of the material used; the modulus and tooth width on the size and weight of the gearbox will be observed. Critical stresses are also calculated. The goal is to prepare the theoretical basis for an optimization process subject to geometric, kinematic, and dynamic constraints that will result in a gearbox as compact, energy-dense, and light as possible without compromising the service life of the components.
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Rubio, Francisco J., Carlos Llopis-Albert, and Ana M. Pedrosa. "Analysis of the Influence of Calculation Parameters on the Design of the Gearbox of a High-Power Wind Turbine." Mathematics 11, no. 19 (2023): 4137. https://doi.org/10.5281/zenodo.10641172.
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As wind turbine power requirements have evolved from the order of kilowatts (kWs) to the order of several megawatts (MWs), wind turbine components have been subjected to more demanding and critical operating conditions. The wind turbine must cope with higher wind loads due to larger blade sizes, which are also time-varying, and, ultimately, higher power levels. One of the challenges in the manufacture of high-power wind turbines lies in the gearbox and consists of achieving ever-greater power density without compromising efficiency, i.e., greater load capacity with lower weight (and production cost) and reduced power losses. Epicyclic geartrains are used to build the gearbox due to various advantages in relation to conventional gear systems, such as higher feasible gear ratios, higher efficiency, compactnesss, and lower weight. In this paper, several epicyclic geartrains with different structures will be analysed to reveal the influence that certain design parameters have on the size and weight of the gearbox components in the selected model and, therefore, of the gearbox itself. For this purpose, the theoretical model of the gearbox will be planned and the influence of the calculation parameters on the gearbox design will be analyzed following ISO 6336. Special emphasis is placed on the influence of the material used; the modulus and tooth width on the size and weight of the gearbox will be observed. Critical stresses are also calculated. The goal is to prepare the theoretical basis for an optimization process subject to geometric, kinematic, and dynamic constraints that will result in a gearbox as compact, energy-dense, and light as possible without compromising the service life of the components
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Panchenko, O. "Assessing the accuracy of modeling the tubbing erector manipulator mechanism in solidworks motion program." Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, no. 3 (June 30, 2023): 75–80. http://dx.doi.org/10.33271/nvngu/2023-3/075.
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Purpose. To estimate the calculation error in determining the kinematic and dynamic characteristics of the UT62 tubbing erector manipulator mechanism movement. Methodology. Modern computer analysis methods are used, which are implemented in a number of computing complexes. Due to the task complexity, a mathematical model for the manipulator mechanism fragment, which is a hydraulic cylinder with two degrees of freedom, has been developed to estimate the error of computer modeling. This model is used as a test model. Findings. On the example of the model study, it is shown that when simulating the mechanism movement, errors in the calculations are possible due to incorrect problem formulation, as well as to the inaccurate settings of the modules for converting the initial data. Under these circumstances, it has been concluded that when the input link movement is specified as a vector, then when determining the kinematic and dynamic characteristics of the mechanism, it is necessary to use a cubic spline in the “interpolator” module. Originality. For the first time, the direct problem of the manipulator mechanism dynamics has been solved, which consists in determining the static and dynamic characteristics of the device according to the given motion law of its drives. It is noted that when the motion is specified in the form of smooth analytical functions, then there is a complete coincidence of the calculation results performed by the SOLIDWORKS MOTION program with those obtained by mathematical modeling. In addition, when the mechanism link input movement is modeled as a vector, which is formed from a discontinuous function, then the cubic spline used in the “interpolator” module provides smooth harmonic functions of the movement, acceleration and jerk processes. As a result of modeling the manipulator mechanism parameters, it turned out that it is not expedient to use more than 50 points of discrete time in the research. Thus, the errors in calculating the maximum power values of the manipulator motors do not exceed 20 % for the power hydraulic cylinder and 5 % for the hydraulic motor. Practical value. The proposed algorithm can be used to model the movement of complex mechanisms in machines.
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DUDLEY, R., and C. P. ELLINGTON. "Mechanics of Forward Flight in Bumblebees: I. Kinematics and Morphology." Journal of Experimental Biology 148, no. 1 (1990): 19–52. http://dx.doi.org/10.1242/jeb.148.1.19.
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Using high-speed cinematography, bumblebees in free flight were filmed over a range of forward airspeeds. A detailed description of the wing tip and body kinematics was obtained from a three-dimensional reconstruction of the twodimensional film image. A technique for determining quantitatively the angle of attack of the wing was developed. Kinematic parameters found to vary consistently with airspeed were body angle, stroke plane angle, geometrical angle of attack, and rotational angles of the wings at the ends of half-strokes. Results of a morphological analysis of the wings and bodies of thoseinsects filmed in free flight are presented for use in later calculations of the lift and power requirements of forward flight.
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Tynianova, Iryna, Viktor Drankovskiy, Oleksandr Tynianov, and Dmytro Savenkov. "ADJUSTMENT OF THE ELEMENTS OF THE FLOW PART OF THE HIGH-EFFICIENCY OF PUMP- TURBINE." Bulletin of the National Technical University "KhPI". Series: Hydraulic machines and hydraulic units, no. 1 (November 29, 2024): 38–43. https://doi.org/10.20998/2411-3441.2024.1.05.
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The problem of the development of pumped storage power plants in Ukraine is considered, especially in the conditions of military operations, which damaged the energy infrastructure and created capacity shortage. The pumped storage power plants will help stabilize the power system by storing energy during periods of low load and efficiently using it during peak needs or accidents. All this has a positive impact on the role of energy autonomy and the integration of renewable energy sources. Efficiency increase of the hydro-turbine equipment of the PSPP requires the improvement of the water passage of the reversible hydraulic machines. This work shows that the creation of high-efficiency reversible hydraulic equipment depends on the correct selection of the geometry of the pater passage elements of the reversible hydraulic machines, consequently ensure the necessary level of energy characteristics of the hydraulic equipment. The equation of the optimal mode was used for the calculated assessment of kinematic and energy characteristics, analysis of their formation and search for rational variants that provide the specified requirements for the runner energy characteristics of the reversible hydraulic machines. Calculations are carried out using dimensionless kinematic parameters, which simplifies the process and eliminates the need for complex calculations. The numerical analysis data on the influence of the hydrodynamic parameters of the water passage on the parameters of the optimal mode can be used both for profiling the blade system of the runner, with the aim of improving energy characteristics (increasing power, efficiency level, etc.), and for modifying the blade system. The numerical study method for finding optimal variants of the runner blade system is given. The proposed approach was used to estimate the kinematic and energy characteristics of water passages of Francis turbines, as well as high-head reversible hydraulic machines ОRО200 and ОRО500 (both for basic and modified variants of the water passage).
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Sharipov, V. M., Yu S. Shchetinin, S. V. Gaev, and O. V. Troshkin. "POWER ANALYSIS OF DUAL-FLOW HYDROMECHANICAL GEARS." Traktory i sel hozmashiny 84, no. 2 (2017): 35–41. http://dx.doi.org/10.17816/0321-4443-66273.
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Dual-flow hydromechanical transmissions are becoming increasingly widespread in the designs of modern land transport and traction machines (tractors, automobiles and high-speed crawler vehicles). This happens mainly due to the desire to increase the efficiency of transmission, although the capabilities of dual-flow hydromechanical transmissions are broader. In order to select a dual-flow hydromechanical transmission scheme in relation to specific operating conditions, it is necessary to know the advantages and disadvantages of various schemes, their potential capabilities. The evaluation of the operation of each circuit can be made on the basis of their kinematic and force analysis. The article deals with 12 dual-flow schemes of hydromechanical transmission with a differential element in inlet and outlet with a mixed meshing of gears, the results of the power analysis are shown. For the estimated parameters of a double-flow hydromechanical transmission were taken: й - power ratio of a double- гмп flow hydromechanical transmission; ан - coefficient of loading of the pump wheel of the torque converter; ам -load factor of the mechanical branch of the closed transmission contour; аa - load factor of the solar gear of the three-link differential mechanism. For each of the schemes considered, analytical dependencies of the estimated parameters on the internal parameters of the hydromechanical transmission were obtained. For the parameters were used the characteristic k of planetary gear set, power йгт and kinematic игт gear ratios of torque converter. It is assumed that, at the boundaries of the range й = да and й = 0. Calculations have been performed to determine the parameters й , гмп гмп гмп ан , ам u аа for different values of k and й , results of which made possible to evaluate the potential transforming properties of the schemes of two-flow hydromechanical transmissions independently of the model of the used hydrotransformer.
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Chernenko, Sergii, Eduard Klimov, Andrii Chernish, Olexandr Pavlenko, and Volodymyr Kukhar. "Simulation Technique of Kinematic Processes in the Vehicle Steering Linkage." International Journal of Engineering & Technology 7, no. 4.3 (2018): 120. http://dx.doi.org/10.14419/ijet.v7i4.3.19720.
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The results of the investigation of the turning kinematics of the steerable wheels of the KrAZ-7634NE off-road vehicle with a wheel formula 8x8 and two front steer axles are given. The theoretical relations between the steer angles of the steerable wheels on the basis of the scheme of double-axle steering turning of the vehicle are shown. The mathematical model of flat four-bar vehicle steering linkage is developed, it determines the relation between the steering linkage left and right steering arms turning angles at any turning radius of the vehicle. KrAZ-7634HE steering three-dimensional model was created and simulation technique of its work was carried out using Creo software. It has been shown that the flat steering linkage model provides sufficient accuracy of calculations in analysis of turning kinematics. The design data can be used for any vehicles that have a similar steering linkage, they allow to analyze the impact of the vehicle design parameters on the turning kinematics and optimize them. Further study of the impact of the kingpin inclinations on the steering linkage kinematic and power characteristics are required.
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Hrytsay, Ihor, Vadym Stupnytskyy, and Andrii Slipchuk. "Simulation of a Power Skiving Gear Cutting Process." Strojnícky časopis - Journal of Mechanical Engineering 73, no. 1 (2023): 103–16. http://dx.doi.org/10.2478/scjme-2023-0008.
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Abstract The results of the computer simulation of the cutting process of gears by the power skiving method are presented. Following the kinematics of the process, a method for generating 3D geometric models of undeformed sheared layers were developed, and their parameters were analyzed. The influence of tool geometry and technological parameters on cutting conditions is investigated. The simulation results and calculation of the tangential force and torque on the tool axis and their influence on the error due to angular elastic deformation of the tool are given.
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Nikolayev, V. A. "Geometric, kinematic and dynamic parameters of the disc ripper." Russian Automobile and Highway Industry Journal 18, no. 5 (2021): 476–87. http://dx.doi.org/10.26518/2071-7296-2021-18-5-476-487.
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Introduction. The unit of continuous action for the formation of the underlying layer is designed to increase labour productivity in the construction of roads and other objects, for the construction of which it is necessary to remove the upper layer of soil. For loosening of soil in the unit used bit-like working bodies. Often, disc working bodies are used to cut the soil. Therefore, the expediency of using passive discs in road-building technical means, in particular, in the unit of continuous action for the formation of the underlying layer of highways, is of practical interest. Despite the large number of works, a detailed analysis of the operation of passive disks was not made. Therefore, in order to compare the energy costs for cutting the soil with passive discs and chisel-shaped working bodies, it is necessary to make a theoretical analysis of the operation of passive disks. Analysis of the energy costs of the disk ripper cannot be carried out without having the approximate values of its geometric, kinematic and dynamic parameters.The method of research. As part of a continuous unit to form the underlying layer of roads, each disc would be clamped with soil on both sides and carried out clamped cutting. Therefore, a disk ripper is adopted for analysis, aggregated with a separate energy device. On the basis of the constructive layout, rational geometric parameters of the disk ripper are revealed. The method of calculation of its kinematic and dynamic parameters is developed. In particular, the method of determining the weighted average circumferental velocity of the disk, the angular velocity of the disk and the circumferental velocity of the point on the edge of the disk blade is considered. The modes of cutting the soil by various parts of the disk are considered.Results. On the basis of the developed technique, the dependence of the minimum diameter of the disk on the depth of soil development was revealed. The moment of resistance of the soil to the rotation of the disks is calculated. The horizontal and vertical component of soil resistance to the front disc carrying out clamped cutting and subsequent discs carrying out semi-clamped cutting of the soil are determined. The necessary thrust force of the energy device for cutting the soil with a disk ripper and the dependence of the thrust force of the energy device for cutting the soil on the depth of soil development were revealed. The performance of the unit, including the power device and the disk ripper, is calculated.Conclusion. Since as part of the unit of continuous action for the formation of the underlying layer of roads, the disks will carry out clamped cutting of the soil, for preliminary loosening of the soil with disks, it is more expedient to use a separate unit, including an energy device and a disk ripper. On the basis of the theoretical studies carried out, the necessary thrust force of the energy device for cutting the soil and the total traction force necessary to move the disc ripper were revealed. The performance of the unit is calculated. To compare the energy costs for cutting the soil with passive discs and chisel-shaped working bodies, it is necessary to make a theoretical analysis of the energy costs for the operation of passive disks.
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Sharipov, V. M., Yu S. Shchetinin, S. V. Gaev, and O. V. Troshkin. "Energy analysis of dual-flow hydromechanical gears." Traktory i sel hozmashiny 84, no. 10 (2017): 39–49. http://dx.doi.org/10.17816/0321-4443-66342.
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Two-flow hydromechanical transmissions are becoming increasingly common in the construction of modern land transport and traction machines (tractors, automobile and high-speed crawler vehicles). This is mainly due to the desire to increase the efficiency of transmission. In order to select a dual-flow hydromechanical transmission scheme in relation to specific operating conditions, it is necessary to know the advantages and disadvantages of various schemes, their potential capabilities. The evaluation of the operation of each circuit can be made on the basis of their kinematic, power, and energy analysis. The results of the kinematic and force analysis of two-flow hydromechanical gears were previously developed by the authors of this article. In energy analysis, the following estimated parameters were used to compare the performance of the transmission: г|ГМП - efficiency of transmission; РМ - power factor in the mechanical branch of the transmission; РН - power factor on the pump wheel of the torque converter; РТ - the power factor on the turbine wheel of the torque converter. The paper considers 12 schemes of two-flow hydrome-chanical gears with a differential link at the input and output with mixed gear coupling, the results of their energy analysis are given. For each of the schemes considered, analytical dependencies of the estimated parameters on the internal parameters of the hydromechanical transmission were obtained, which were used as the characteristic k of the planetary gear set, the power transfer ratio йгт of the torque converter, and the kinematic gear ratio игмп of the hydromechanical transmission. The results of calculations performed on a computer using the external characteristic of a specific torque converter are obtained and presented in graphical form. The obtained results can be used in developing recommendations for the choice of a two-flow hydromechanical transmission scheme.
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Alimova, F. A. "Mathematical modeling of small soil channel laboratory stand drive and evaluation of its energy state." IOP Conference Series: Earth and Environmental Science 1284, no. 1 (2023): 012031. http://dx.doi.org/10.1088/1755-1315/1284/1/012031.
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Abstract The article presents data on improving the design of the Small Soil Channel research laboratory stand. The possibilities of experimental works on study of kinematic parameters and structural parameters, spatial dynamometering of working elements of tillage and sowing machines are described. The article considers the method for assessing the energy state of the laboratory stand small soil channel and studying the power distribution in its moving mechanisms. Based on the parameters obtained as a result of solving the equations of motion and energy state, using the full differential of the Hamelton function, the power distribution in the mechanisms under the action of external forces and the total mechanical energy of the stand are determined. The traction resistance of stand working body was determined using the Goryachkin formula. Based on the developed kinematic scheme, a mathematical model has been developed that imitates the movement of the belt transmission mechanism of the stand. Based on the developed mathematical model, calculation experiments were carried out using the Runge-Kutt numerical method, the results made it possible to find the motion parameters of the belt transmission mechanism of the stand. The results obtained when solving the mathematical model of the belt transmission mechanism of the stand made it possible to determine the parameters of movement of the stand engine and the drum. This article presents the results of determining the stiffness and elasticity coefficients of the belt, the moment of resistance of the drum, the driving moment of the driving pulley, angular speed, angular rooting, the moment of inertia of the driving and driven pulleys by compiling a mathematical model of the Laboratory Stand Small Soil Channel that imitates the working process of tillage and sowing machines.
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Xu, Jinchao, Wensong Wang, Wei Li, Qijun Zhu, and Hui Lu. "Kinematic and Dynamic Analysis of Eccentric Balanced Positive Torque Pumping Unit." Machines 12, no. 4 (2024): 240. http://dx.doi.org/10.3390/machines12040240.
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Beam pumping units have numerous energy transfer links, significant net torque fluctuations and negative net torque in gear boxes, which lead to a high installed power and low system efficiency. In order to improve the efficiency of the pumping unit, in this paper, an eccentric balanced positive torque pump unit was designed based on the principle of eccentric balance that is small in size and adopts a flexible energy transfer system instead of a rigid structure to significantly reduce the energy transfer link. The kinematics and dynamics of the eccentric balanced positive torque pumping unit were analyzed and the ability to operate with positive torque over the entire cycle was verified using theoretical computations. And the results of the theoretical calculation were verified by using the virtual prototype simulation and analysis software ADAMS (Automatic Dynamic Analysis of Mechanical Systems); the pumping unit was optimized for relevant parameters such as the balance crank angle λ and the counterweight center of mass offset angle δ. Indoor testing and comparative field application have demonstrated that the installed power has been reduced by 80%, the weight of the entire prototype has decreased by 25% and the system efficiency has reached 24.3%. Additionally, electricity savings of over 50% have been achieved. These results indicate that the pumping unit has been designed correctly, has high reliability and has significantly improved system efficiency while also providing an obvious energy-saving effect.
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Maksimov, R. O., and I. V. Chichekin. "A virtual test bench for determining the loads in the air suspension of the rear trolley of a truck at the early stages of design." Izvestiya MGTU MAMI 15, no. 3 (2021): 76–86. http://dx.doi.org/10.31992/2074-0530-2021-49-3-76-86.
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To determine the maximum loads acting in the rear air suspension of a truck at the early stages of design there was used computer modeling based on solving equations of dynamics of solids and implemented in the Recurdyn software. The components of the developed virtual test bench, including hinges, power connections, drive axles, a wheel-hub assembly with a wheel and a support platform, are considered in detail. The test bench is controlled using a mathematical model created in the environment for calculating the dynamics of rigid bodies and associated with a solid suspension model by standard software tools of the application. The test bench is controlled using a mathematical model created in the environment for calculating the dynamics of rigid bodies and associated with a solid suspension model by standard software tools of the application. The use of such a test bench makes it possible to determine the loads in the hinges and power connections of the suspension, to determine the mutual positions of the links for each load mode, to increase the accuracy of the calculation of loads in comparison with the flat kinematic and force calculation. The mathematical model of the virtual test bench allows to carry out numerous parametric studies of the suspension without the involvement of expensive full-scale prototypes. This makes it possible at the early stages of design to determine all hazardous modes, select rational parameters of the elements, and reduce design costs.
 The paper shows the results of modeling the operation of a virtual test bench with an air suspension in the most typical loading modes, identifying the most dangerous modes. The efficiency and adequacy of the mathematical model of the suspension was proved. Examples of determining the force in all the joints of the structure, the choice of maximum loads for design calculations when designing the air suspension of vehicle were shown.
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Hrudkina, Natalia. "Process modeling of sequential radial-direct extrusion using curved triangular kinematic module." FME Transactions 49, no. 1 (2021): 56–63. http://dx.doi.org/10.5937/fme2101056h.
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In this article new engineering calculations such as the value of the relative strain pressure for the combination of a triangular kinematic module with external modules of various configurations are developed. This allowed us to describe qualitatively the nature of the metal flow in the reversal zone before radial extrusion. This made it possible to achieve a decrease in the predicted assessment of the power mode for the deformation process with comparison by the use of rectangular modules. The greatest reduction in the value of the relative strain pressure corresponded to a combination with an adjacent rectangular module (with the missing vertical component CPVF) and can obtain 7-8%. The deviation of the theoretical results in the power parameters of the process by using a triangular kinematic module are 12-15% for a process with a developed flow radial component. The resulting calculations can be used to model new cold extrusion processes.
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Nikolaiev, V. A. "Minor rotor tines and knives soil interaction. Total power calculation for minor rotor drive." Russian Automobile and Highway Industry Journal 21, no. 1 (2024): 12–25. http://dx.doi.org/10.26518/2071-7296-2024-21-1-12-25.
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Introduction. The problem of fast and high-quality road construction, when economic facilities and settlements are spatially separated, located at a considerable distance from each other, cannot be solved without the use of a complex of continuous units. An important element of the continuous unit forming the ditch and the unit for tunneling is the direct-flow rotary ripper. Current theoretical studies are not sufficient to calculate the interaction with the soil of the elements of a direct-flow rotary ripper. The lack of theoretical justification for the parameters of direct-flow rotary rippers hinders their use. Therefore, there is a need for theoretical research to identify the geometric, kinematic, dynamic and energy parameters of structural elements.The method of research. Methods for calculating the required power to drive the teeth, to separate the seam from the soil mass with knives and divide it into fragments, to overcome the inertia force of the incoming soil on two small rotor knives, to accelerate the soil towards the large rotor, to move the soil towards the large rotor, to overcome the friction force of the soil on the front surface of the knives have been developed. The total power required to drive the small rotor corresponds to the sum of the powers: for the introduction of a cone with a spiral knife into the ground, for the drive of the teeth and for the drive of the knives.Results. On the basis of the developed methods, the parameters were calculated. From the flat and spatial model of the forces of interaction with the ground of the elements of the small rotor, their resultant, their components, and normal forces are revealed. The friction force of the soil on the front surface of the knife is calculated. The total power for the drive of the small rotor and the volumetric energy for the introduction of the small rotor into the ground are calculated.Conclusion. The energy costs for driving small rotor knives include: energy for separating the reservoir and dividing it into fragments, energy for overcoming the pressure of the soil on the front surface of the knife, energy for accelerating the soil, energy for moving the soil, energy for overcoming the friction force of the soil on the front surfaces of the knives. The total energy cost of the small rotor drive includes the energy required to introduce the spiral knife cone, teeth and knives of the small rotor into the ground. As a result of the calculations, the power to drive the teeth of the small rotor is 735 W, the total power required to drive the small rotor is 2.2 kW. The volumetric energy for the introduction of a small rotor into the ground is 33.1 kJ / cubic meter.
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Shlepkin, A., A. Morozov, A. Sakhipgareev, and D. Kalyakin. "DETERMINATION OF THE COMPLEX OF THERMOPHYSICAL PROPERTIES OF BORIC ACID WATER SOLUTIONS AT PARAMETERS CHARACTERISTIC FOR VVER EMERGENCY MODE." PROBLEMS OF ATOMIC SCIENCE AND TECHNOLOGY. SERIES: NUCLEAR AND REACTOR CONSTANTS 2021, no. 2 (2021): 268–80. http://dx.doi.org/10.55176/2414-1038-2021-2-268-280.
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The article presents the results of experimental studies of the thermophysical (density, viscosity) and physicochemical (degree of acidity - pH) properties of water solutions of boric acid. A review of the available literature data on the effect of the properties of boric acid solutions on heat removal from the reactor core is presented. It has been established that the available information is very general and does not cover the entire range of parameters (temperature, pressure, acid concentration) characteristic of a possible emergency at a nuclear power plant with a VVER reactor. Methods and facilities for conducting experimental studies are described. The results of experimental studies are presented. The density of aqueous solutions of boric acid with a concentration of 2.5-450 g/kg H2O at a temperature of 25-130 °C was determined. The dependence of the investigated characteristic on temperature and concentration was also obtained. The results of an experimental study of the kinematic viscosity of water solutions of boric acid with a concentration of 2.5-200 g/kg H2O at a temperature of 25-90 °C were obtained. The total error in measuring the viscosity of aqueous solutions of boric acid did not exceed 2 %. The pH values of water solutions of boric acid in the temperature range 25-50 and concentrations of 2.5-450 g/kg H2O were determined. The dependence for calculating the degree of acidity of boric acid is obtained. Experimental data on the thermophysical and physicochemical properties of water solutions of boric acid can be used to refine the results of calculations of emergency heat removal processes in a reactor facility, carried out using both one-dimensional calculation programs and three-dimensional CFD codes.
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Chorshanbiev, Umar, Ahmadjon Ibadullaev, Durdona Toshpulatova, Askar Babaev, and Baxadir Kakharov. "Modification of dispersed systems and its effect of the internal corrosion of hydrotransports." E3S Web of Conferences 383 (2023): 04032. http://dx.doi.org/10.1051/e3sconf/202338304032.
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Studies The impact of the modification of dispersed systems of kinematic and dynamic parameters of hydraulic windows, as well as wear in pressure pipes, taking into account the variability of the mechanical composition and the number of hydraulic windows. It is recommended for the modifying additives of the GosIpol resin for dispersed systems and its movements in the cylindrical pipes. The current model that takes into account the concentration of turbidity in the stream and the structural composition of dispersed systems, developed methods of calculation in the process of hydrotransport of modified dispersed systems. The method of calculating the rate of internal corrosion of hydrotransports, specific pressure losses for fluid and solid flow and the effect of variability of the mechanical composition of particles and concentration of turbidity to the flow rate and power of the modified dispersion system is justified, the dependence of the hydraulic friction coefficient from the flow movement mode, taking into account the variability of the solid flow concentration in modified dispersed systems of hydrotransport.
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Dobretsov, Roman, Sergey Voinash, Andrey Karnaukhov, Aleksandr Ivanov, and Alexander Scherbakov. "Active trailer with variable base for the timber industry." E3S Web of Conferences 402 (2023): 10043. http://dx.doi.org/10.1051/e3sconf/202340210043.
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For forest machines (skidders, forwarders), due to the peculiarities of work cycles and a wide range of changes in resistance to movement, a power plant with a heat engine most of the time operates in a non-optimal mode. It is proposed to overcome this disadvantage by using an active trailer link. The issues of the features of the use of active trailers as part of road trains of forest machines are considered. A trailer with a variable base was chosen as the basis, as the most popular and widespread in the forestry complex. The structure of an electromechanical transmission based on the principle of using a central electric motor and a controlled interwheel power distribution mechanism is proposed. The principles of determining the power of thermal and electric motors are considered. A method for calculating the external parameters characterizing the power distribution mechanism based on the principle of matching the radii of the kinematic and power turn is proposed, and a design scheme for turning the road train is given. The main assumptions are formulated to justify the possibility of the proposed calculated dependencies. The way of synthesis of kinematic schemes of such mechanisms, approaches to design and production are indicated. A technology for controlling such mechanisms is proposed. An example is considered, a variant of the kinematic scheme of the power distribution mechanism is given. The ways of project realization are shown.
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Sevost'yanov, M. "THEORY AND PRACTICE OF BRIQUETTING OF POLYDISPERSE MATERIALS AND PRODUCTION WASTE IN PRESS-ROLL INSTALLATIONS." Bulletin of Belgorod State Technological University named after. V. G. Shukhov 5, no. 9 (2020): 89–96. http://dx.doi.org/10.34031/2071-7318-2020-5-9-89-96.
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The article deals with theoretical and experimental studies of the compaction processes of various types of powdered polydisperse materials for the study of kinematic, design-technological and energy-power parameters of units. The basic laws of briquetting in press-roll units and the need for their constructive and technological implementation have been established. The calculation of the main energy-power parameters of the equipment for briquetting (pressing force; power expended by the roller and jaw pre-compactors; total power consumed by the roller press) is presented. It allows considering the physicomechanical characteristics and physicochemical properties of technogenic materials. The paper presents patent-protected designs of aggregates for briquetting polydisperse waste with both high and low bulk density. The necessity of preliminary compaction of briquetted charges during their molding is shown, which is effective in the implementation of any compaction process. The use of devices for preliminary compaction of the material and the forming elements of the grooved-toothed and cell-type rolls make it possible to obtain briquettes of a given geometric shape and dimensions, taking into account the requirements of the consumer. The results of theoretical and experimental studies can be used not only for the processing and disposal of secondary raw materials (polydisperse waste) of individual industries, but also for the production of various types of marketable products.
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Błażkiewicz, Michalina, Ida Wiszomirska, Katarzyna Kaczmarczyk, Grażyna Brzuszkiewicz-Kuźmicka, and Andrzej Wit. "Lower limb loading during knee up in step aerobics: a pilot study." Biomedical Human Kinetics 8, no. 1 (2016): 124–30. http://dx.doi.org/10.1515/bhk-2016-0018.
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SummaryStudy aim: Step aerobics is a form of aerobic power distinguished from other types of aerobic exercise by its use of an elevated platform. The purpose of this study was to examine how the aerobic exercise “knee up” affects kinematic and kinetic parameters and, above all, the length of the muscle contractions. Material and methods: The study analysed ten female fitness instructors with at least six years of experience. The task consisted in the knee up move performed using a 15 cm step and music with the beat frequency of 148 BPM. Kinematic and kinetic parameters were recorded using the Vicon system synchronized with two Kistler force plates. OpenSim software was used for calculation of the length of involved muscles. Results: Ranges in angles and torques suggest that the location that is the most prone to injuries and overtraining is the knee joint, followed by the hip and ankle joints. Greater values of the vertical component of ground reaction forces were observed during stepping down, which suggests greater load to the joints. The greatest work in the move analysed in this study was performed by the sartorius muscle and the tensor fasciae latae muscle. Conclusions: Despite the benefits that have been demonstrated when step classes are structured correctly and adapted to the participants, further research is needed concerning biomechanical load, exercise prescription, and injury prevention.
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Gmyrya, N. G., V. M. Sharipov, Y. S. Schetinin, A. V. Denisov, A. P. Marinkin, and E. E. Baulina. "Building of crawler transporters of extra light weight category on the basis of units and components of automobiles." Izvestiya MGTU MAMI 7, no. 2-1 (2013): 23–33. http://dx.doi.org/10.17816/2074-0530-68114.
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The authors propose new schemes of steering mechanisms of tracked vehicles made on the basis of units and components of automobiles. The mathematical model of the steady turning of tracked vehicles with such steering mechanisms are developed as well as methods for calculating kinematic parameters, power and energy loading of the elements in the scheme taking into account the power losses in the transmission and suspension. The accuracy of the mathematical models is confirmed by the results of field tests of a tracked crawler "Vegus" with the proposed schemes of steering mechanisms.