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1
Ivshin, Igor Vladimirovich, Andrey Michailovich Kopylov, and Alfred Robertovich Safin. "Numerical Modeling of Dynamic Processes of the Reciprocating Reversible Electrical Machine." Applied Mechanics and Materials 792 (September 2015): 134–42. http://dx.doi.org/10.4028/www.scientific.net/amm.792.134.
Повний текст джерелаАнотація:
Now rotational electrical machines are used mainly for the implementation a reciprocating motion of working mechanisms and also as the electric generators powered by internal combustion engines. It is achieved by means of the kinematic transfers complicating a design and reducing the drive efficiency. The use of linear reciprocating electric machines allows to eliminate these defects. It should be noted that the most effective ones are the cylindrical designs of reciprocating electric machines with permanent magnets, whose efficiency reaches 93 – 95%. However, the rarity and lack of a mass production of this machine type and special recommendations for their design causes the need of research, directed on search of optimum constructive decisions. The article describes the types of linear electrical machines and summarizes the results of numerical modeling of dynamic characteristics for the three versions of the reciprocating cylindrical machine with permanent magnets of 10 kW with the oscillation frequency of the translator 20 Hz and the length of operating cycle of 120 mm. The most effective design parameters of linear electric machine were determined on the basis of its specific characteristics and analysis of the EMF graphics shape, appearing on the stator windings in the generator mode.
2
Kuklina, Irina Gennadevna. "AUTOMATION OF DESIGN PROCESSES WHEN CREATING AND OPERATING SPECIAL CARS." Computational nanotechnology 6, no. 4 (December 30, 2019): 9–17. http://dx.doi.org/10.33693/2313-223x-2019-6-4-9-17.
Повний текст джерелаАнотація:
The fundamental task of the modern engineer-creator of specialized automotive equipment (the study examines cross- country vehicles and equipment for the construction and maintenance of roads) is a competent and high-performance application of modern information technologies, as noted in the Government Decree of 2014 . The author of the article proposed a structured set of application of object-oriented information methodologies for solving problems of calculation and visualization when creating highly reliable vehicles equipped with long screw rotors . The methodologies of automation and computerization of design processes in calculating the dynamics of a machine (the creation of a competent design of vibration damping in automotive vehicles is one of the most important tasks of car builders) were considered and proposed at the end of the last and the beginning of the modern century by leading foreign and Russian authors [4, p. 53].Snow and swamp vehicles - so often called rotor-screw machines are equipped with long screw rotors [6, p. 23], the use of which significantly increases the cross-country ability of the machine [7, p. 135], but also increases the vibrational loads on the operator and passengers of the all-terrain vehicle. The creation of a methodology for calculating the oscillatory processes of these machines is devoted to the works of famous scientists of Russia . The proposed surveys are devoted to the use of modern information technologies to increase the speed and quality characteristics of calculation processes when creating comfortable and reliable special vehicles with rotary thrusters. Calculation programs are accompanied by video playback of machine units.The article proposes an original object-oriented system for studying dynamic vibration loading of machines with linear contact between the supporting surface and the propulsion. It is the uniqueness of rotor-screw machines that creates difficult conditions for the design engineers of these machines. Automation of complex calculations of the oscillatory system of these machines is an important task for Russian designers.
3
Alimkhodjaev, Kamoliddin, Murakam Mirsaidov, Malika Khalikova, and Jasurbek Nizamov. "Transient processes of vibration machines with inertial electric drives." E3S Web of Conferences 216 (2020): 01121. http://dx.doi.org/10.1051/e3sconf/202021601121.
Повний текст джерелаАнотація:
In order to conduct model experimental studies of the mutual influence of electromagnetic and mechanical transient processes of starting up inertial vibration drives with an asynchronous motor, its mathematical model is being developed. The analytical dependence of the dynamic mechanical characteristics of the vibrator at various values of the rotor acceleration is determined. The mathematical model uses the dynamic mechanical characteristics of an induction motor as a torque.
4
Agarwal, Praveen, Amandeep Singh, and Adem Kilicman. "Development of key-dependent dynamic S-Boxes with dynamic irreducible polynomial and affine constant." Advances in Mechanical Engineering 10, no. 7 (July 2018): 168781401878163. http://dx.doi.org/10.1177/1687814018781638.
Повний текст джерелаАнотація:
In recent years, the need to develop advanced information technology systems in the area of mechanical engineering has been growing continuously to deliver better product quality at reduced cost. Embedding the electronics and software with machines transform them into smart machines sophistically called mechatronic. These software-oriented machines collect big data using sensors and other electronics and share among other smart machines, which further helps them in controlling the manufacturing processes, decision-making, and even in maintenance. Machine-to-machine sharing of data involves the risk of data stealing or modification, which may further disrupt the working of manufacturing process and leads to poor quality product. For data security, block ciphers like advanced encryption standard are needed. Advanced encryption standard is an encryption algorithm which is widely used to provide security to sensitive information by organizations. The main core of advanced encryption standard is its non-liner component that is S-Box, which is also called substitution table. The S-Box provides confusion capabilities in algorithm. The point of interest for cryptanalysis and hackers is S-Box, which is fixed in case of advanced encryption standard. Cryptanalysis and hackers exploit this weakness of advanced encryption standard. Many researchers tried to modify S-Box using different techniques. In this article, we tried to create dynamic S-Boxes which are key-dependent and, at the same time, they are using dynamic irreducible polynomial and affine constant.
5
Tverdokhlib, Igor, and Oleg Omelyanov. "CURRENT STATE OF SCIENTIFIC AND TECHNICAL DEVELOPMENTS IN THE FIELD OF IMPROVING THE EFFICIENCY OF VIBRATION EQUIPMENT AND TECHNOLOGIES." ENGINEERING, ENERGY, TRANSPORT AIC, no. 3(114) (September 28, 2021): 75–90. http://dx.doi.org/10.37128/2520-6168-2021-3-9.
Повний текст джерелаАнотація:
The article considers the state of scientific and technical developments in the field of improving the efficiency of vibration technology. Production activity in most branches of industrial production is provided by the work of various technological machines and vehicles. The operation of machines, equipment, mechanisms, apparatus and devices in the conditions of the need to ensure high productivity is often accompanied by significant dynamic loads, vibration processes and manifestations of shock interactions of machine elements. Ensuring the reliability and safety of machines requires at all stages of their life cycle serious attention to compliance with certain restrictions on the parameters of the dynamic state of technical objects, the development of methods and means of assessing control and management of dynamic interactions. Modern mechanical engineering is a scientific basis for solving the main problems of machine dynamics, which, in general, is based on scientific potential created by domestic and foreign scientists in the field of theoretical and applied mechanics, theory of mechanisms, dynamics and strength of machines, development of scientific directions in automatic control theory. applied system synthesis, etc. The results of scientific research are reflected in the works of famous scientists. The formed practice of pre-design researches of the created machines, the equipment and the equipment is based on wide use of means of mathematical modeling, application of means of computer engineering. The choice of equipment in production is based on cost, productivity, size, energy consumption, etc. In this regard, there is a question of the need to find and develop new approaches, methods and means to ensure the efficiency and reliability of technological machines and equipment.
6
Woźniak, Adam, and Grzegorz Krajewski. "CMM Dynamic Properties of the Scanning Measurement of a 2D Profile." International Journal of Automation Technology 9, no. 5 (September 5, 2015): 530–33. http://dx.doi.org/10.20965/ijat.2015.p0530.
Повний текст джерелаАнотація:
Scanning probe CMMs have come to be considered the standard in coordinate metrology, not only because they provide high-quantity, high-speed data gathering but also because the scanning technology significantly decreases inspection time. Modern manufacturing, especially in today’s highly competitive economy, requires increasingly efficient measuring machines and processes because inspection machines have often become the bottlenecks in the entire manufacturing processes. More efficient coordinate metrology can mean faster measurement cycles with acceptable accuracies. However, increasing scanning speeds has also significantly increased errors. This article proposes a new method of investigating and identifying the principal components of CMM dynamic errors. The principle of the method is presented, and the validity of the method is experimentally confirmed on a bridge coordinate measuring machine.
7
Grischenko, Volodimir Mikolayovich, and Kateryna Serhiivna Leonova. "Application of computer systems for modeling dynamic processes of lifting machines." Bulletin of the National Technical University «KhPI» Series: Dynamics and Strength of Machines, no. 2 (December 31, 2021): 69–77. http://dx.doi.org/10.20998/2078-9130.2021.2.249498.
Повний текст джерелаАнотація:
The main task of mechanical engineering is to organize the production of a range of machines to meet the needs of all industries. These are power, transport, lifting and transport units, agricultural machinery, construction industry, etc. Among them, one can single out devices in which the relative movement of their parts is assigned, that is, kinematic pairs are included in the calculation models. The real operating conditions of machines are varied, but most often they are associated with periodic starts-stops, which determines the relevance of the study of unsteady modes. The analysis of the operation of such models becomes more complicated. For successful design results, mathematical modeling of individual processes in mechanisms is carried out. One of the first calculations is dynamic. Modern, available CAD / CAE systems for modeling and analysis provide automation capabilities, building more realistic design models. The paper discusses the approbation of the use of CAD for modeling the dynamics of a jib crane with a set of four units: platform, boom, sleeve and rod. The developed model is combined: the platform and the sleeve correspond to the kinetostatic model, and the boom and rod are elastic. The crane is designed to perform lifting operations in a vertical plane, with the possibility of relative movement in 3 rotational and one translational kinematic pairs. The performed calculations of the static, modal and dynamic analyzes of the links of the mechanism confirm the adequacy of their models. Among them is the task of instantaneous load application, which is typical for the "lifting and picking" operating mode of crane lifting mechanisms. The deformation of the entire structure in one of the boom positions is also considered. The determination of the reaction forces in the hydraulic cylinder provides important information for the selection of the power unit.
8
Nesmiyan, Andrey, Lyudmila Kravchenko, Vladimir Khizhnyak, and Elena Zubrilina. "Probabilistic modeling for dynamic processes." E3S Web of Conferences 175 (2020): 05019. http://dx.doi.org/10.1051/e3sconf/202017505019.
Повний текст джерелаАнотація:
The probability of event occurrence can be determined by calculation, however for complex processes, accounting for multiple states is so complex that the probability of the final event cannot be determined differently than by collecting statistical data. This reduces the ability to predict outcomes in any process simulation, which affects the quality of advanced systems. The development of methods for predicting the probability of occurrence of an event when considering complex dynamic processes is a pressing task, the solution of which will help to improve the quality of modeling of technological processes and, as a result, to increase the efficiency of designing machines implementing them. The authors proposed a probability modeling method for dynamic processes, which is a special way of applying probability theory and is workable if the change in the parameters analyzed corresponds to the normal law of distribution. A study carried out on the analysis of the process of sowing corn seeds by vacuum sowing made it possible to predict with reliability more than 95% the probability of formation of “zero seed fodders” depending on their physical and mechanical properties, as well as parameters and adjustment modes of operation of the device.
9
Nikitina, I., and A. Polyakov. "SPECIFIC FEATURES OF THERMAL PROCESSES IN DOUBLE-SIDED FACE GRINDING MACHINES." Bulletin of Belgorod State Technological University named after. V. G. Shukhov 6, no. 1 (February 4, 2021): 82–94. http://dx.doi.org/10.34031/2071-7318-2021-6-1-82-94.
Повний текст джерелаАнотація:
The paper presents an analysis of thermal processes in the bearing system of a double-sided face grinding machine. Experimental data on temperatures and displacements obtained when the machine is idling and when imitating the grinding process with the help of electric heaters of various powers are used for analysis. The performed studies have shown that thermal deformations of double-sided face grinding machines with an arc trajectory of workpiece feed occur in a wide range in magnitude and direction. It can violate the main requirement for the precise operation of the machine - the symmetry of processing conditions at both ends of the workpiece. From the experiments, the absolute value of the non-parallelism of the grinding wheels after three hours of operation is established; it is almost twice the value of the removed allowance. Analysis of the kinetic change in the deformations of the supporting system of the machine tool during operation under thermal load shows that as it warms up, the relative position of the grinding wheels gradually changes from the state "wider at the bottom" to the state "narrower below". This leads to a spontaneous change in the dynamic tuning of the technological system and a corresponding change in the processing accuracy. Changes in the dynamic tuning of the technological system with varying intensity continue throughout the entire operating time of the machine.
10
Chen, Shuxian, Zongqiang Ren, Xikai Yu, and Ao Huang. "A Dynamic Model of Evolutionary Knowledge and Capabilities Based on Human-Machine Interaction in Smart Manufactures." Computational Intelligence and Neuroscience 2022 (April 26, 2022): 1–10. http://dx.doi.org/10.1155/2022/8584888.
Повний текст джерелаАнотація:
The increasing use of smart machines and devices is not only changing production principles but also reshaping the value of cocreation logic. The interaction between human and smart machine is the enabler of generating augmented intelligence. A system dynamics model is abstracted from smart manufacturing practices to represent the evolutionary processes of inertia, capability, and reliability induced by human-machine interaction. Human-machine interaction is conceptualized into two dimensions: technical and cognitive interaction. Simulation experiments illustrate how the improvement of human-machine interaction can leverage the dynamic capability and reduce the inertia in enterprises through multiple nonlinear feedbacks. There are two pathways to improve reliability and performance in enterprises by human-machine interaction: (1) to promote initiative innovation (change) from endogenous enabler by improving dynamic capability and (2) to promote transformation of knowledge and variation triggered by exogenous environmental changes to improve the dynamic capability for the flexibility and reliability.
11
Fariz Qafarov, Fariz Qafarov, Elnarə Səlimova Elnarə Səlimova, and Aybəniz Əmirova Aybəniz Əmirova. "VIBRATION PROCESSES AND THEIR RELATIONSHIP WITH DEFECTS." PAHTEI-Procedings of Azerbaijan High Technical Educational Institutions 11, no. 07 (November 5, 2021): 81–86. http://dx.doi.org/10.36962/pahtei1107202181.
Повний текст джерелаАнотація:
ABSTRACT The article is devoted to vibration diagnostics, an effective method for assessing the parameters of the mechanical state of centrifugal pumping units. The use of vibration diagnostics allows, due to early detection of malfunctions, to improve target operation, increase the turnaround time and reduce the likelihood of emergency destruction of pumping unit elements. Diagnostic signs of the presence of defects in various elements of the pumping unit are presented. During the development of diagnostic methods, the character stages of the development of injuries are selected. These stages are the formation of the injury, the accumulation of injuries, collapse, and so on. consists of stages. Dynamic forces are considered to be the main cause of vibration in machine parts. It is under the influence of dynamic forces that fatigue breaks down in machine parts. The use of vibrodiagnostics in machine parts allows to accurately assess the degree of damage to its individual nodes. This, in turn, leads to improved operating conditions. In conclusion, it should be noted that vibrodiagnostics not only detects malfunctions in machines, but also reveals the causes of its formation. Keywords: vibrodiagnostics, improvement of operational conditions, determination of defects, probability of emergency destruction, repair, assessment.
12
Zakovorotny, V. L., and V. E. Gvindzhiliya. "Synergetic Concept of Software Control of Machining Processes on Metal-Cutting Machines." Proceedings of Higher Educational Institutions. Маchine Building, no. 5 (734) (May 2021): 24–36. http://dx.doi.org/10.18698/0536-1044-2021-5-24-36.
Повний текст джерелаАнотація:
High precision metal-cutting machines ensure that the programmed machine actuator trajectories correspond to the real ones. For lathes these are the trajectories of the longitudinal and transverse calipers of the system, as well as the spindle. The purpose of processing is to produce parts of a given quality while minimizing the manufacturing costs. The condition of the dynamic cutting system, determined by the trajectories of forces and deformations, affects the quality indicators of parts and the cutting efficiency, which depends on the intensity of tool wear. The properties of the system change depending on the phase trajectory of the power of irreversible transformations of the energy supplied to the cutting zone by the work performed. Their changes related with the evolution of the parameters of the dynamic link formed by cutting are manifested in the development of tool wear and changes in the quality of the part. Thus, the power of irreversible energy transformations is one of the internal factors causing changes in the output characteristics of processing and the state of the process. In this regard, when processing on machine tools, there is a problem of synergistic coordination of external control (for example, the CNC program) with internal one, the source of which is the irreversible transformation of the energy supplied to the cutting zone. The article considers the problem of synergetic coordination of external and internal controls during cutting process, the solution of which will allow increasing the efficiency of processing on CNC machines. A mathematical model of a controlled dynamic cutting system and control algorithms are proposed to improve the efficiency of processing parts of a given quality while minimizing the intensity of tool wear. Testing of the developed algorithms has shown that their use reduces the cost of manufacturing parts by 1.2.
13
Sira, Natalia, Antonina Kolohoida, Oleksandr Lytvyn, and Dmytro Kalchenko. "DEFINITION OF DYNAMIC CHARACTERISTICS GRINDING OF CYLINDRICAL AND NEEDLE ROLLER SURFACE OF A TEXTILE MACHINE." Technical Sciences and Technologies, no. 2(16) (2019): 44–53. http://dx.doi.org/10.25140/2411-5363-2019-2(16)-44-53.
Повний текст джерелаАнотація:
Urgency of the research. In the process of fabricating fabrics, various types of aggregates are used in the textile industry, such as crocheting, crocheting and others. Their working part is the drums and rollers covered with card headset. The quality of the work surface of the card headset is subject to high requirements, since the occurrence of an error in the craft drum or roller of the textile unit causes the formation of an uneven gap between the working elements and, accordingly, the release of the poor-quality product. And not a satisfactory condition of the working surface of the needles causes a gap in the material, which also increases the percentage of the gap. Target setting. Given the large dimensions of the drums and rollers of textile machines, as well as the slight stiffness of the headset, the dynamic impact on the accuracy of the processing has a significant impact. Actual scientific researches and issues analysis. Various aspects of the theory of fluctuations of rigid structures are investigated, which allows us to use an analytical approach to many practical cases. The main issues of the dynamics of metal-cutting machine tools are considered: equivalent and elastic systems, working processes, stability of the dynamic system, stationary and transitional processes. The data on the closed dynamical system of the machine, the indicators of dynamic quality are given. The methods of finishing a grinding of smooth cylindrical and sharpening of needle surfaces of drums and rollers of textile machines are offered. Uninvestigated parts of general matters defining. However, the study of dynamic characteristics in the process of finishing grinding cylindrical and needle surfaces of drums and rollers of textile machines was not conducted. Research of dynamic characteristics of the grinding process of cylindrical and needle surfaces of drums and rollers of textile machines, and determination of dynamic properties of elements of the processing system. The statement of basic materials. The value of the initial deflection of the needles as a result of their impact on the surface of the grinding wheel at the time of entry into the processing zone was determined. A spatial model of the needle was constructed and its frequency analysis in the Solidworks system was performed. Since the processing of textile rollers is proposed to be carried out on the grinding machine VZ-208F3, a modal analysis of its spindle assembly was also carried out. In the experimental study, the amplitude-phase-frequency characteristic is constructed. Conclusions. Through the computer spatial modeling, the first five self-oscillation frequencies were determined, as well as the corresponding oscillation patterns for the needle of the card headset and for the spindle knot of the machine VZ- 208F3. Experimental way is the amplitude-phase-frequency characteristic of the spindle.
14
Bratu, Polidor, Nicușor Drăgan, and Cornelia Dobrescu. "Dynamic Performances of Technological Vibrating Machines." Symmetry 14, no. 3 (March 7, 2022): 539. http://dx.doi.org/10.3390/sym14030539.
Повний текст джерелаАнотація:
Based on the research carried out within the Research Institute for Construction Equipment and Technology—ICECON S.A. Bucharest, consisting of the design and development of vibrating-action machines and of the technical analysis of optimization of the technological processes with vibrating equipment for highway construction works in Romania. Moreover, the physical and mathematical modeling of this mechanical system used the data obtained in the activity of the certification of the technical level of capability of the processing equipment in industry and construction, taking into account the provisions of procedures and regulations legally enforced by normative documents. These are based on a parametric analysis of the dynamics of the technological processing vibratory equipment and machines. Thus, both the evaluation method and the parametric optimization procedure were established. In this context, this paper presents a numerical analytical approach with discrete and continuous parametric variations, from where favorable areas of operation can be established. In this way, the optimization criteria in stabilized harmonic vibration regimes are approached based on the assessment of the vibration amplitude, of the force transmitted to the processed material and of the energy dissipated in the system. The presented dynamic model as well as the specific parameters were used in the design and/or numerical and experimental assessment for vibrating rammers with the amplitude of the perturbing force from 2 kN up to 100 kN, vibrating compactors with the amplitude of the perturbing force from 100 kN up to 200 kN and vibrating sieves for mineral aggregates with surface sieves of 6, 12 and 18 sqm. The symmetry/asymmetry properties are specific to the dynamic response in steady-state technological regime. Thus, the amplitude of vibrations in resonance presents asymmetry through a functional level necessary for the technological regime. The maximum force transmitted in the technological process is asymmetric in relation to the variation of the excitation pulsation; also, the dissipated energy has asymmetries in the postresonance. Hysteresis loops are symmetrical to the main axis. The originality of the research results comes from the establishment of dynamic parameters for the amplitude of technological vibration, the force transmitted to the working part, the energy dissipated on the cycle, hysteresis loops in a steady-state regime with digital display to identify the dynamic regime and the damping in the system. The calculation relations are specific to machines with a vibrating action and, on their basis, the vibrating equipment from Romania were designed, manufactured and tested, as mentioned in this paper.
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Malev, N. A., and O. V. Pogoditsky. "STATISTICAL ANALYSIS OF DYNAMIC CHARACTERISTICS ASYNCHRONOUS ELECTRIC MOTOR WITH CHANGING LOAD PARAMETERS." Proceedings of the higher educational institutions. ENERGY SECTOR PROBLEMS 21, no. 1-2 (April 11, 2019): 120–30. http://dx.doi.org/10.30724/1998-9903-2019-21-1-2-120-130.
Повний текст джерелаАнотація:
Abstract: Research of operation electrical machines in transitional mode is an actual task. Modeling dynamic processes with changing load parameters and probabilistic assessment of simulation results allows taking into account the degree of influence of these changes on transient response. An approach to the study of the dynamics of an asynchronous electrical motor under external and parametric perturbations shown. Recommendations was given on the use of this method in solving the problem of identifying the parameters of electric machines.
16
Маршаков, Владимир Кириллович, Александр Давыдович Кононов, Андрей Александрович Кононов, and Владимир Исламович Гильмутдинов. "MODELING OF SOME DYNAMIC CHARACTERISTICS OF TECHNOLOGICAL MACHINES OF THE ROAD-BUILDING COMPLEX." Housing and utilities infrastructure, no. 4(19) (December 22, 2021): 85–92. http://dx.doi.org/10.36622/vstu.2021.19.4.009.
Повний текст джерелаАнотація:
Рассмотрены варианты моделирования управления мобильными технологическими машинами строительного комплекса для различных задач автоматизации рабочих процессов с целью уменьшения выбросов в атмосферу за счет сокращения расхода топлива. Представлены возможные схемы снижения вредных вибрационных воздействий на оператора машины. На основе анализа динамических характеристик в операторной форме и с учетом передаточных функций, рассмотрены требования к подвеске технологической машины, повышающие защиту машиниста от воздействия вибраций при автоматическом управлении рабочими процессами. Приведены функциональные схемы динамических систем, позволяющие учитывать изменение упругих и демпфирующих свойств обрабатываемой поверхности грунта. We considered some variants of modeling control of mobile technological machines of the construction complex for various tasks in automation of work processes in order to reduce emissions into the atmosphere by reducing fuel consumption. We presented as well possible schemes for reducing harmful vibration effects on the machine operator. Being based on the analysis of dynamic characteristics in the operator form and taking into account the transfer functions, we considered the requirements for the suspension of a technological machine. This increases the protection of the driver from the effects of vibrations during automatic control of work processes. Functional schemes of dynamic systems are given, which allows us to take into account changes in the elastic and damping properties of the processed soil surface.
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Forgó, Zoltán, Ferenc Tolvaly-Roșca, Judit Pásztor, and Attila Kovari. "Energy Consumption Evaluation of Active Tillage Machines Using Dynamic Modelling." Applied Sciences 11, no. 14 (July 6, 2021): 6240. http://dx.doi.org/10.3390/app11146240.
Повний текст джерелаАнотація:
Soil tillage is a very energy-intensive operation. A general expectation is to reduce energy consumption and reduce soil compaction with as few turns and interventions as possible. Thus, more and more attention is being paid to the use of active tillage machines. The aim of the present work is to test a new approach to optimize PTO-driven tilling machine operations regarding energy consumption. A real, active tillage machine, the MSS-140 type spading machine, was investigated in the Matlab® Simscape™ environment. The solid model of the spading machine was built using actual dimensions. The work done by a single spade is broken down into elementary processes. The acting forces on the implement, in each elementary process for different advancing speeds, were modelled and calculated. The model is suitable for illustrating the dynamics of loads and for calculating the mechanical work. The model was also tested in comparison with real fuel consumption. The consumed fuel quantity was measured and the energy requirement for the model calculated at three advancing speeds. A comparison between the measured and calculated energy consumption values was made: the calculated results are similar to the measured values; the mean difference is 9.91%, with a standard deviation 3.3%.
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ZALYUBOVSKYI, Mark, Viktor MALYSHEV, and Igor PANASYUK. "DETERMINATION OF THE DYNAMIC TORQUE OF THE RESISTANCE OF THE DRIVE SHAFT OF THE REPLACING MACHINE FORMED BY THE MOVEMENT OF THE BULK ENVIRONMENT IN THE WORK TANK." HERALD OF KHMELNYTSKYI NATIONAL UNIVERSITY 297, no. 3 (July 2, 2021): 94–99. http://dx.doi.org/10.31891/2307-5732-2021-297-3-94-99.
Повний текст джерелаАнотація:
Galvanizing technological operations include the processes of cleaning the surfaces of parts from burrs, burrs, bumps and scale, corrosion products, rounding of sharp edges, separation of parts from castings, as well as processes to improve the quality of product surfaces: grinding or polishing. These technological operations are implemented using different types of equipment: vibrating, rotary and spindle machines, rotating drums, etc. The most promising are considered to be machines with complex spatial movement of working tanks. Analytical researches of definition of dynamic moment of resistance of a driving shaft of the shredding machine on the basis of laws of movement of loose mass in the middle of working capacity are carried out. The positions of the moving parts of the machine and the bulk array in the middle of the tank, which correspond to the maximum dynamic component of the moment of resistance on the drive shaft created by the bulk array loaded to the working tank. An expression is obtained to calculate the value of the dynamic component of the moment of resistance on the drive shaft of the machine, created by the bulk array loaded to the working tank. The obtained research results can be used by the relevant machine-building enterprises at the stage of designing galvanizing types of equipment with tanks performing complex spatial motion.
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Kabaldin, Yu G., D. A. Shatagin, M. S. Anosov, and A. M. Kuzmishina. "Development of digital twin of CNC unit based on machine learning methods." Vestnik of Don State Technical University 19, no. 1 (April 1, 2019): 45–55. http://dx.doi.org/10.23947/1992-5980-2019-19-1-45-55.
Повний текст джерелаАнотація:
Introduction. It is shown that the digital twin (electronic passport) of a CNC machine is developed as a cyber-physical system. The work objective is to create neural network models to determine the operation of a CNC machine, its performance and dynamic stability under cutting.Materials and Methods. The development of mathematical models of machining processes using a sensor system and the Industrial Internet of Things is considered. Machine learning methods valid for the implementation of the above tasks are evaluated. A neural network model of dynamic stability of the cutting process is proposed, which enables to optimize the machining process at the stage of work preparation. On the basis of nonlinear dynamics approaches, the attractors of the dynamic cutting system are reconstructed, and their fractal dimensions are determined. Optimal characteristics of the equipment are selected by input parameters and debugging of the planned process based on digital twins.Research Results. Using machine learning methods allowed us to create and explore neural network models of technological systems for cutting, and the software for their implementation. The possibility of applying decision trees for the problem of diagnosing and classifying malfunctions of CNC machines is shown.Discussion and Conclusions. In real production, the technology of digital twins enables to optimize processing conditions considering the technical and dynamic state of CNC machines. This provides a highly accurate assessment of the production capacity of the enterprise under the development of the production program. In addition, equipment failures can be identified in real time on the basis of the intelligent analysis of the distributed sensor system data.
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Alukhanyan, Arthur, Olga Panfilova, and Vadim Alukhanyan. "Testing of MTF replacement dynamic model for model example." E3S Web of Conferences 273 (2021): 07022. http://dx.doi.org/10.1051/e3sconf/202127307022.
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The article is devoted to testing of economic and mathematical model for reequipment of machine-tractor fleet (MTF) of agricultural enterprise using the model example simulating real technological and economical processes used at the enterprise. Moreover, the daily capacity of machines, schedule of optimum agrotechnical terms for operations, etc. are given as basic examples of the technological process in the model example. Moreover, the algorithm for correction of optimum solving consisting of eight steps is given in the research. The value of the next controlled variable by its rounding to the integer value is recorded at each step of the algorithm.
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Wang, Yingxu, Yousheng Tian, and Kendal Hu. "Semantic Manipulations and Formal Ontology for Machine Learning based on Concept Algebra." International Journal of Cognitive Informatics and Natural Intelligence 5, no. 3 (July 2011): 1–29. http://dx.doi.org/10.4018/ijcini.2011070101.
Повний текст джерелаАнотація:
Towards the formalization of ontological methodologies for dynamic machine learning and semantic analyses, a new form of denotational mathematics known as concept algebra is introduced. Concept Algebra (CA) is a denotational mathematical structure for formal knowledge representation and manipulation in machine learning and cognitive computing. CA provides a rigorous knowledge modeling and processing tool, which extends the informal, static, and application-specific ontological technologies to a formal, dynamic, and general mathematical means. An operational semantics for the calculus of CA is formally elaborated using a set of computational processes in real-time process algebra (RTPA). A case study is presented on how machines, cognitive robots, and software agents may mimic the key ability of human beings to autonomously manipulate knowledge in generic learning using CA. This work demonstrates the expressive power and a wide range of applications of CA for both humans and machines in cognitive computing, semantic computing, machine learning, and computational intelligence.
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Макаров, Владимир, Vladimir Makarov, Сергей Никитин, and Sergey Nikitin. "Efficiency increase in profile deep grinding of turbine blade on NC multi-axes machines." Science intensive technologies in mechanical engineering 2018, no. 4 (April 19, 2018): 21–29. http://dx.doi.org/10.12737/article_5aacd857ebb357.07694535.
Повний текст джерелаАнотація:
The paper reports the procedure of a cutting mode purpose at deep profile grinding on NC multi-axes machines on the basis of the modeling of thermo-dynamic processes in cutting areas with the purpose of ensuring turbine blade fatigue resistance. There are shown simulators allowing the definition and prediction of the dynamics of elastic, thermal and working processes in a technological system, material removal, cutting force, temperatures in the area of cutting and roughness of each elementary area of the surface profile on the basis of cutting modes, disk characteristics.
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Zarook, Yaser, Javad Rezaeian, Iraj Mahdavi, and Masoud Yaghini. "Efficient algorithms to minimize makespan of the unrelated parallel batch-processing machines scheduling problem with unequal job ready times." RAIRO - Operations Research 55, no. 3 (May 2021): 1501–22. http://dx.doi.org/10.1051/ro/2021062.
Повний текст джерелаАнотація:
This paper considers the minimization of makespan in the unrelated parallel batch processing machines scheduling problem with considering non-identical job size and dynamic job ready time. The considered unrelated machines have different capacity and different processing speed. Each machine processes a number of the jobs as a batch at the same time so that the machine’s capacity is not exceeded. The batch processing time and the batch ready time are equal to the largest processing time and the largest ready time of jobs in the same batch, respectively. In this paper, a Mixed Integer Linear Programming (MILP) model, two categories of the heuristic procedures (six heuristics) and a meta-heuristic algorithm are proposed to solve the problem. A lower bound is also presented by relaxing of the original problem to evaluate the quality of the proposed algorithms. The computational experiments show the performance of the proposed algorithms under the considered measures.
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Poll, Hans Günther, José Carlos Zanutto, and Walter Ponge-Ferreira. "Hydraulic Power Plant Machine Dynamic Diagnosis." Shock and Vibration 13, no. 4-5 (2006): 409–27. http://dx.doi.org/10.1155/2006/203834.
Повний текст джерелаАнотація:
A method how to perform an entire structural and hydraulic diagnosis of prototype Francis power machines is presented and discussed in this report. Machine diagnosis of Francis units consists on a proper evaluation of acquired mechanical, thermal and hydraulic data obtained in different operating conditions of several rotary and non rotary machine components. Many different physical quantities of a Francis machine such as pressure, strains, vibration related data, water flow, air flow, position of regulating devices and displacements are measured in a synchronized way so that a relation of cause an effect can be developed for each operating condition and help one to understand all phenomena that are involved with such kind of machine. This amount of data needs to be adequately post processed in order to allow correct interpretation of the machine dynamics and finally these data must be compared with the expected calculated data not only to fine tuning the calculation methods but also to accomplish fully understanding of the influence of the water passages on such machines. The way how the power plant owner has to operate its Francis machines, many times also determined by a central dispatcher, has a high influence on the fatigue life time of the machine components. The diagnostic method presented in this report helps one to understand the importance of adequate operation to allow a low maintenance cost for the entire power plant. The method how to acquire these quantities is discussed in details together with the importance of correct sensor balancing, calibration and adequate correlation with the physical quantities. Typical results of the dynamic machine behavior, with adequate interpretation, obtained in recent measurement campaigns of some important hydraulic turbines were presented. The paper highlights the investigation focus of the hydraulic machine behavior and how to tailor the measurement strategy to accomplish all goals. Finally some typical recommendations based on the experience obtained on previous diagnostic reports of Francis turbines are performed in order to allow a better and safe operation of these power plant units.
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Uchitel, A. D., Yu A. Malinovsky, A. N. Panchenko, G. V. Danilina, and S. Y. Datsenko. "BACKGROUND TO THE ARRANGEMENT OF AUTOMATING AND VOLVOUS PROCESSES IN THE FORM-FORMING MACHINES WHEN TREATING THE PREPARATIONS AND DETAILS BY THE PLASTIC DEFORMATION METHOD." Metallurgicheskaya i gornorudnaya promyshlennost, №6, 2018, no. 6 (December 2018): 21–29. http://dx.doi.org/10.33101/s063456734.
Повний текст джерелаАнотація:
Purpose. Analysis of surface-hardening technology for cold processing of metals, taking into account the deformation-wave processes occurring in the area in front of the shaping tool. Methodology. To establish the reasons for obtaining finished products with increased roughness, insufficient contact strength, fracturing and peeling of the surface layers, as well as the occurrence of significant dynamic loads in the mechanisms of machines for machining parts using plastic deformation, a two-mass design model is used in which the working tool is connected by friction with the moving processed workpiece. Findings. The results of determining the conditions for the occurrence of self-oscillations in the system “workpiece - tool” are presented. Based on the analysis of the friction characteristics as a function of the mutual slip rate between the workpiece and the shaping tool, the range of slip speeds is set, at which the self-oscillating processes for the friction pair can be excited: "tool - workpiece". Originality consists in the fact that the influence of the variable friction force on the occurrence of sustained self-oscillations between the workpiece being processed and the tool in the machines for “cold” plastic deformation of the metal has been established. The conditions for the occurrence and absence of self-oscillations in the zone of contact between the tool and the workpiece are found. Practical value lies in the fact that the modes of operation of machines for processing products by plastic deformation have been revealed under which unregulated roughness, fracturing and “peeling” of the parts being machined can occur, as well as a high dynamic background during the operation of the shaping tool of driving and power mechanisms. Practical recommendations are given to improve the performance of finished products and reduce vibroactivity in the drive. Keywords: running in, dragging, knurling, plastic deformation, elastic deformation wave, roller, tool, blank.
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Kurowski, Piotr. "Modal-Model Applications for Large Energetic Machines." Key Engineering Materials 347 (September 2007): 221–26. http://dx.doi.org/10.4028/www.scientific.net/kem.347.221.
Повний текст джерелаАнотація:
Modal models are commonly encountered forms of dynamic characterization of mechanical structures. They are applied in machine-condition diagnosing as well as in monitoring processes. In research practice the most frequently applied method is Experimental Modal Analysis, and in exploitation - Operational Modal Analysis. Difficulties associated with the EMA and OMA have contributed to the increase of OMAX model applications, especially in case of energetic machines. Theoretical assumptions related with modal analysis are very strong. In reality when big and heavy structures are considered often those assumptions are not fulfilled. In the paper such situations are considered and practical solutions are showed.
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Kharlamov, Viktor, and Denis Popov. "Mathematical modeling of physical processes in the complex for testing of induction machines." MATEC Web of Conferences 239 (2018): 01055. http://dx.doi.org/10.1051/matecconf/201823901055.
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The paper is devoted to the simulation of the test complex designed for energy-efficient load testing of induction machines by the method of mutual load with the exchange of electrical energy through the network. It is noted that for other similar test schemes, the mathematical model will have a slightly different form, but it will be identical in terms of asynchronous machines, network and frequency converter. The compiled mathematical model of the test complex allows studying the variable parameters of the system in all elements of the test scheme in static and dynamic modes of operation as well. The synthesized mathematical model can be used to determine the parameters of the equipment in the designed test complexes if the parameters of the test and load machines are known. The results of simulation of the test complex for the given parameters of the test and load induction machines are obtained.
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Cheshchin, Dmitriy O., Vadim V. Plokhikh, and Andrey K. Tkachuk. "ABOUT THE POSSIBILITY OF APPLICATION OF ENERGY STORAGE IN IMPACT MACHINES." Interexpo GEO-Siberia 2, no. 4 (May 21, 2021): 181–89. http://dx.doi.org/10.33764/2618-981x-2021-2-4-181-189.
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The article discusses the possibility of using energy storage devices in the form of pneumatic and mechanical springs for hydraulic percussion machines as part of robotic drilling systems. New design schemes are proposed that allow changing the energy parameters of the machine in accordance with the external operating conditions for the implementation of adaptive technological processes. Simulation modeling of the proposed schemes in the ITI SimulationX software package made it possible to determine the dynamic parameters and study the working cycle of the hydraulic hammer. The analysis of the results obtained showed the possibility of creating these types of machines, taking into account their advantages and disadvantages.
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STEPCHYN, Yaroslav, Valentyn OTAMANSKYI, and Illia MALYSHEV. "DYNAMIC PROCESSES ANALYSIS IN HIGH-SPEED SPINDLE ASSEMBLIES OF MACHINES TOOL WITH ACCOUNT DIFFERENT TYPES NONLINEARITY." Herald of Khmelnytskyi National University 305, no. 1 (February 23, 2022): 130–35. http://dx.doi.org/10.31891/2307-5732-2022-305-1-130-135.
Повний текст джерелаАнотація:
The productivity and accuracy machine parts often depend on the dynamic processes during machine and cutting operation. The increase requirements for machining operation and quality machine parts leads to the need to evaluate and take into account all the capabilities of the technological processing system (TS) to ensure the stability of the cutting process and increase speed. One of the features emergence and existence of self-oscillating processes, the least studied and dangerous in terms of the effect on sustainability ТS is the nonlinearity parameters elastic system of the machine tool and the processes occurring during cutting operation. Therefore, to assess the conditions for implementation of the cutting process with a steady limited amplitude of oscillations, it is necessary to analyze and take into account the main nonlinearities dynamics of the TS. The article considers dynamic processes in high-speed processing systems on the example of high-precision spindle assemblies, with analysis and following review of their different types nonlinearity. The machine tool spindle unit for the case of high-speed processing according to the working conditions approaches the scheme of the rotor system which self-oscillations can be caused by the action of non-conservative circulation-type forces that are not associated with external periodic loads or any resonant relationships: internal friction forces, hydrodynamic forces in sliding bearings and seals, electrodynamic and electromagnetic forces in the electrical components of motor-spindles. It is shown that if the nonlinearity is associated only with internal external friction and coefficients of friction forces do not depend on frequency, the amplitude and frequency of self-oscillations (unlike linear system) will depend only on relationship of friction forces.
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Nguyen, Loc Huu, and Thuy Van Tran. "Advances in the dynamic characteristics of high -speed machine structure." Science and Technology Development Journal 20, K5 (August 31, 2017): 73–80. http://dx.doi.org/10.32508/stdj.v20ik5.1162.
Повний текст джерелаАнотація:
The quality of machining is dependent on the machine’s dynamic behavior throughout the operating process. Because of the loads or vibration during operation, the rigidity of the machine structure can be reduced. Therefore, the study of advances in the dynamic characteristics has great significance for the development of machine tools, especially for high-speed machines. This paper presents the design and analysis of a rigid gantry structure with a spindle speed in the range of (6.000 ÷ 24.000)rpm, corresponding to the natural frequency of the machine structure more than (100 ÷ 400)Hz. Use CAE (computer-aided engineering) analysis software to analyze the natural frequency of machine structure. The research results show that the machine structure will have good stiffness, high vibration resistance and avoid resonance to achieve the best machining surface. In addition, it is the basis for selection of cutting mode suitable for the machining process in order to improve the reliability and efficiency of work of the machine structure and the accuracy of the processed products.
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Godzhaev, Zakhid, Sergey Senkevich, Victor Kuzmin, Ekaterina Ilchenko, Mikhail Chaplygin, Ilya Alekseev, and Alexander Prilukov. "Simulation of the dynamic processes of a low-capacity combine harvester movement." E3S Web of Conferences 164 (2020): 06009. http://dx.doi.org/10.1051/e3sconf/202016406009.
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To automate the process of harvesting crops, different types of harvesting machines are required. The most common type of machines used to automate ingathering are harvesters. The use of harvesters for collecting grain crops is rational in fields from 2 hectares. On smaller areas it is not profitable and difficult to apply. For applications in small areas, low-capacity harvesters with a throughput of the thresher up to 1 kg/s (small-sized) may be suitable. The purpose of this study is to analyze the cushioning mass control system of a low-capacity unmanned combine harvester using computer simulation, as well as the simulation of directional stability and turning. To calculate vertical vibrations in the Matlab/Simulink software package, a model of a cushioning system for a wheeled agricultural combine was prepared. In the same software package, simulation of directional stability and turning implementation was carried out. The parameters of vibration displacement, vibration velocity and acceleration, as well as the vibration frequency indicators on the operator's seat are determined. Comparison of the simulation results of the initial and corrected direction of movement of the harvester showed that for this model the maximum deviation from the planned path is a maximum of 10%, which is within acceptable limits. The maximum deviation of the harvester from the course does not exceed the permissible values, which is acceptable accuracy to ensure directional stability.
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MÖHRING, H. Christian, Thomas STEHLE, and Matthias SCHNEIDER. "LIGHTWEIGHT MACHINE ENCLOSURES FOR DYNAMIC AND EFFICIENT PRODUCTION PROCESSES." Journal of Machine Engineering 19, no. 2 (June 9, 2019): 46–53. http://dx.doi.org/10.5604/01.3001.0013.2350.
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Usually machining centres for processing wood-based and composite materials have moving partial machine enclosures in the X-axis direction. Because the workpieces to be machined are often large (e.g. aircraft doors), these partial enclosures have prevailed on the market compared to voluminous complete enclosures. Owing to the general trend towards complete machining through process integration, an increasing number of additional units are integrated into machining centres in addition to the main spindle. This leads to an increase of the mass to be moved as well as a larger and thus heavier partial enclosure. This inevitable increase in mass leads to a deterioration of the dynamic properties of the machine. To counteract this increase in mass, the use of lightweight design materials for machine enclosures becomes in the focus of attention. The lightweight materials to be used must comply with the requirements of modern mechanical engineering and legislation: retention in the event of tool breakage, reduction in the noise exposure of the machine environment and cost-effective solutions compared to the materials used nowadays. The sheet steel used today as material for partial enclosures is therefore to be supplemented or replaced with suitable lightweight design materials. Different lightweight materials are qualified for suitability as machine enclosure. Apart from mass reduction, ecological as well as economic aspects of the used materials play an important role. For this purpose, the safety properties (impact resistance in case of tool breakage / collision) of these weight-reduced materials have to be determined. In addition, an improvement in the acoustic behaviour of the machine is achieved by the new lightweight materials since the machine enclosure shields the distinctive sound sources.
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Zhang, Ruirui, and Xin Xiao. "Study of Immune-Based Intrusion Detection Technology in Virtual Machines for Cloud Computing Environment." Mobile Information Systems 2017 (2017): 1–15. http://dx.doi.org/10.1155/2017/2301970.
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Cloud computing platforms are usually based on virtual machines as the underlying architecture; the security of virtual machine systems is the core of cloud computing security. This paper presents an immune-based intrusion detection model in virtual machines of cloud computing environment, denoted as IB-IDS, to ensure the safety of user-level applications in client virtual machines. In the model, system call sequences and their parameters of processes are used, and environment information in the client virtual machines is extracted. Then the model simulates immune responses to ensure the state of user-level programs, which can detect attacks on the dynamic runtime of applications and has high real-time performance. There are five modules in the model: antigen presenting module, signal acquisition module, immune response module, signal measurement module, and information monitoring module, which are distributed into different levels of virtual machine environment. Performance analysis and experimental results show that the model brings a small performance overhead for the virtual machine system and has a good detection performance. It is applicable to judge the state of user-level application in guest virtual machine, and it is feasible to use it to increase the user-level security in software services of cloud computing platform.
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Kravchuk, Volodymyr Ivanovych, Heorhiy Leonidovych Baranov, Karnil Salai, Tetyana Viktorivna Haidai, and Olena Serhiyivna Komisarenko. "Guaranteed-Adaptive Control of Agricultural Machines Working Processes and Its Efficiency." Journal of Computational and Theoretical Nanoscience 17, no. 9 (July 1, 2020): 4779–83. http://dx.doi.org/10.1166/jctn.2020.9378.
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Theoretical researches of formation of necessary and sufficient conditions of the guaranteed adaptive control (GAC) of the intellectualized agricultural machines working processes in the real-time modes for increase of quality and efficiency of technical and technological solutions of crop products production are carried out. It is investigated that in the conditions of natural uncertainty of factors of agriculture and changing environment during elaboration of GAC of agricultural machines it is expedient to use the principles of guaranteeing and adaptation. The advantage of GAC against the traditional automatic control system (ACS) is the unconditional use of criterion conditions of efficiency under any form of spectral interference density. Quality is guaranteed by a special searchless adaptation procedure (automatic tracking) and modeling of subsystems of agricultural machines, taking into account their complexity in a single hierarchical system. Within the analytical solution of the optimization problem and the search for the optimal functional efficiency of technical and technological solutions, the need for additional formalization of the function of minimizing real losses is proved, which is taken into account at the stages of designing of planned modes of operation and mechanical specifications of machines, determination of optimal combinations of actuators, as well as optimization of dynamic parameters for different load modes.
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Mancisidor, Iker, Xavier Beudaert, Gorka Aguirre, Rafael Barcena, and Jokin Munoa. "Development of an Active Damping System for Structural Chatter Suppression in Machining Centers." International Journal of Automation Technology 12, no. 5 (September 5, 2018): 642–49. http://dx.doi.org/10.20965/ijat.2018.p0642.
Повний текст джерелаАнотація:
The presence of chatter vibrations is one of the main limitations of machining processes in terms of productivity, as they prevent obtaining the required surface finishes and decrease the life of tools and the mechanical elements of the machine. The use of active dampers governed by a control strategy permits an increase in structural damping without significantly changing the machine design. The main objective of this study is to improve the dynamic capabilities of the machine, and to increase the chatter-free region. This objective is achieved by the addition of an electromagnetic actuator located as close as possible to the cutting point. The electromechanical design of the actuator is described, and a novel double flexure guarantees a constant gap between the moving magnets and the coils. This smart mechatronic system allows the introduction of new additional functions: process and machine monitoring, chatter avoidance by spindle speed modification, and machine dynamics calibration. All of these functions enhance standard milling machines.
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Azab, Eman, Mohamed Nafea, Lamia A. Shihata, and Maggie Mashaly. "A Machine-Learning-Assisted Simulation Approach for Incorporating Predictive Maintenance in Dynamic Flow-Shop Scheduling." Applied Sciences 11, no. 24 (December 10, 2021): 11725. http://dx.doi.org/10.3390/app112411725.
Повний текст джерелаАнотація:
In this paper, a machine-learning-assisted simulation approach for dynamic flow-shop production scheduling is proposed. This is achieved by introducing a novel framework to include predictive maintenance constraints in the scheduling process while a discrete event simulation tool is used to generate the dynamic schedule. A case study for a pharmaceutical company by the name of Factory X is investigated to validate the proposed framework while taking into consideration the change in forecast demand. The proposed approach uses Microsoft Azure to calculate the predictive maintenance slots and include it in the scheduling process to simplify the process of applying machine-learning techniques with no need for hard coding. Several machine-learning algorithms are tested and compared to see which one provides the highest accuracy. To gather the required dataset, multiple sensors were designed and deployed across machines to collect their vitals that allow the prediction of whether and when they require maintenance. The proposed framework with discrete event simulation generates optimized schedule with minimum makespan while taking into consideration predictive maintenance parameters. Boosted Decision Tree and Neural Network algorithms showed the best results in estimating the predictive maintenance slots. Furthermore, the Earliest Due Date (EDD) model produced the minimum makespan with 76.82 h while scheduling 25 products using 18 machines.
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Chen, Y. S., Y. D. Cheng, J. J. Liao, and C. C. Chiu. "Electromagnetic—rotordynamic integrated vibration analysis for electrical machines." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 223, no. 11 (July 21, 2009): 2549–59. http://dx.doi.org/10.1243/09544062jmes1459.
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A systematic approach for analysing vibration-related problems of electrical machines, integrating both complex electromagnetic and rotordynamic analyses, is completely presented with an in-house finite-element solution module, formulated from related theories in rotor-dynamics. The electromagnetic analysis processes with the MagNet software are described herein to obtain the performance curves of electrical machines. They are integrated into the equation of motion to investigate the corresponding vibration characteristics. Based on the previously published work, the squirrel-cage-type induction motor is employed as an extended case study to demonstrate the integrated procedure. Three types of silicon steel core materials are considered in order to explore their effects in the dynamic properties of the system. Also, what happens on the vibration amplitude of rotor critical positions at the instant right before and after passing the critical speed are investigated thoroughly. The corresponding results exhibit that the complete procedures in using the proposed methodology can solve the reliability issues of electrical machines effectively.
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Sand, Christian, Dominik Manke, and Jörg Franke. "Virtual Process Data Linkage of Assembly Stations in High Variance Workshop Production." Applied Mechanics and Materials 871 (October 2017): 60–68. http://dx.doi.org/10.4028/www.scientific.net/amm.871.60.
Повний текст джерелаАнотація:
The advance of digitalization changes the requirements of processes in industrial production and assembly. For this reason, production and assembly must now be able to execute complex process steps. This is about quality and productivity expectations, as well as flexibility and reliability of production, lines and plants [1]. Today, data is generated by almost every system, machine and sensor, yet it is hardly used for process optimization. Manufacturing processes are usually organized as workshop production or chained production systems, in addition to standalone machines [2,3]. Most analytic projects focus on chained systems and serial production, unlike individual machines and specific workshop production. Depending on manufacturing IT, process data from serial production is stored in data bases, which are usually optimized for traceability. Standalone machines and machines within workshop production are scarcely connected to a common data base. The required process data is stored either on the module itself or inside a local data base [4]. The identification of dependencies between individual assembly processes, energy data and the quality of the finished product is necessary for an extended optimization. These optimizations can be process-specific, as well as environmental and resource related. Due to decentralized process data storages, an overall view of a dynamic order-oriented value chain is denied. Therefore, the potential of the machines is largely unused. Based on Data Mining, this advanced development can be counteracted by process monitoring and optimization. Therefore, this paper provides a solution for a virtual process data linkage of assembly stations. This enables the acquisition, processing, transformation and storage of unstructured raw data by special software and methods, which is also able to cope with chained production systems and standalone machines. For further analysis of interdependencies, a visualization is developed for advanced monitoring and optimization [5,6].
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Tolvaly-Rosca, Ferenc, Judit Pásztor, and Zoltán Forgó. "Kinematic and Dynamic Modeling of the Rotary Harrow." Acta Universitatis Sapientiae, Electrical and Mechanical Engineering 13, no. 1 (December 1, 2021): 25–38. http://dx.doi.org/10.2478/auseme-2021-0003.
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Abstract The actual energy situation and the significant energy demand of agricultural production require the exploration and analysis of the general laws of the main processes in the field of energy, which is part of the borderline between the technical sciences and the agricultural sciences. Tillage machines change the physical properties of the soil, but at the same time the mechanical properties of the soil react to the implement. One of the basic works of seedbed preparation is harrowing. In this work we study the kinematics and dynamics of the active rotary harrow implements, taking into account the cutting resistance of the soil. The results obtained with the developed modeling methods, give reliable approximations to the experienced tilling processes.
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Kononov, Dmytro, Viktor Yermokratiev, and Yevhen Miroshnyk. "Investigation of transitional processes of vibration machine with inertionic vibrator and asynchronous motor." System technologies 2, no. 133 (March 1, 2021): 97–109. http://dx.doi.org/10.34185/1562-9945-2-133-2021-11.
Повний текст джерелаАнотація:
Strict compliance with technological requirements in the production of steel is one of the main factors that determine the quality of products. In the mining industry, at metallurgical enterprises and transport hubs, all kinds of vibrating machines are widely used, and in particular vibrating conveyors (VTM): vibrating conveyors, vibrating conveyors and feeders, vibrating screens and screen feeders, and vibratory loaders. The main type of drive of such machines is an inertial drive, which consists of unbalanced vibrators. This drive is simple and has been widely used in vibrating machines of various types. To ensure stable operation (constancy of the oscillation amplitude when changing any system parameters) of such a vibrating machine with an inertial drive, a resonant setting is used. In this regard, there are difficulties that arise during start-up and run-out of the vibrating feeder: increasing the amplitude of oscillations, load on the foundation, power consumption, which leads to the fact that the motor does not reach rated speed and fails during start-up. Purpose: to study the dynamics of transients in VTM, which accompany the start of VTM from rest and run. The idea of the work is computer simulation of VTM dynamics based on numerical integration of a system of nonlinear differential equations describing the motion of a machine. As well as comparing them with experimental data. A mathematical model of VTM has been developed, differential equations of VTM motion have been compiled taking into account the characteristics of an induction motor. To solve the system of differential developed a program in the application Simulink. The obtained dependences confirm the increase in the amplitude of oscillation of the VTM tray when empty and stop VTM, which must be taken into account to calculate the parameters of the systems with vibrating machines. The experimental data are compared with the calculated ones, there is a good coincidence of results.
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Yang, Jung-Min, and Seong-Woo Kwak. "A Survey on Dynamic Corrective Control of Asynchronous Sequential Machines." Applied Sciences 12, no. 5 (March 1, 2022): 2562. http://dx.doi.org/10.3390/app12052562.
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As a feedback control methodology exclusively targeting asynchronous sequential machines (ASMs), corrective control has been rapidly developing for the past two decades. This paper presents a comprehensive survey on the theory and application of dynamic corrective control in which the controller also has the form of an ASM. First, basic notions and principles of dynamic corrective control, including models of ASMs and configurations of closed-loop systems, are reviewed. Next, assorted dynamic corrective control schemes are presented aiming at solving specific control problems of ASMs, such as model matching and fault-tolerant control. Variations of control aspects are classified according to modeling formalisms of controlled ASMs—input/state, input/output, and composite ASMs—and involved fault characteristics, such as transient, permanent, and intermittent faults and intelligent attacks. Representative results on the application of fault-tolerant corrective control to real-world engineering systems are also provided with an emphasis on space-borne digital systems. Finally, some challenging topics for future studies on corrective control are discussed.
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Zolotov, Aleksandr N., Vladislav N. Kovalnogov, and Ruslan V. Fedorov. "SOFTWARE AND INFORMATION SYSTEM FOR ANALYZING THE THERMAL STATE OF TURBINE MACHINE BLADES." Автоматизация Процессов Управления 62, no. 4 (2020): 103–8. http://dx.doi.org/10.35752/1991-2927-2020-4-62-103-108.
Повний текст джерелаАнотація:
Increased input parameters of the pressure and temperature of the working fluid in gas turbine installations result in the complex gasdynamic and temperature operation modes of the blade apparatus, but it is the principal tool for improving the energy efficiency of gas turbine installations in general. Applying the efficient methods of mathematical modeling and numerical study of gas-dynamic processes of a turbine machine may simplify this process and reduce financial costs. The article considers the main methods of increasing the energy efficiency of modern gas turbine machines are considered. One of the implementation ways is the use of software systems for calculating the thermal state of turbine machine blades.
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Denkena, Berend, Benjamin Bergmann, and Tobias H. Stiehl. "Transfer of Process References between Machine Tools for Online Tool Condition Monitoring." Machines 9, no. 11 (November 10, 2021): 282. http://dx.doi.org/10.3390/machines9110282.
Повний текст джерелаАнотація:
Process and tool condition monitoring systems are a prerequisite for autonomous production. One approach to monitoring individual parts without complex cutting simulations is the transfer of knowledge among similar monitoring scenarios. This paper introduces a novel monitoring method which transfers monitoring limits for process signals between different machine tools. The method calculates monitoring limits statistically from cutting processes carried out on one or more similar machines. The monitoring algorithm aims to detect general process anomalies online. Experiments comprise face-turning operations at five different lathes, four of which were of the same model. Results include the successful transfer of monitoring limits between machines of the same model for the detection of material anomalies. In comparison to an approach based on dynamic time warping (DTW) and density-based spatial clustering of applications with noise (DBSCAN), the new method showed fewer false alarms and higher detection rates. However, for the transfer between different models of machines, the successful application of the new method is limited. This is predominantly due to limitations of the employed process component isolation and differences between machine models in terms of signal properties as well as execution speed.
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Artiomov, Mykola, Dmytro Klets, Volodymyr Boldovskyi, Andrii Makovetsky, and Kateryna Kostyk. "The Influence of the Driving Speed and Vertical Acceleration of the Mobile Machine on the Change of Soil Packing." International Journal of Engineering & Technology 7, no. 4.3 (September 15, 2018): 179. http://dx.doi.org/10.14419/ijet.v7i4.3.19730.
Повний текст джерелаАнотація:
The article deals with the processes of changing the vertical forces acting on the propulsion of mobile machines, causing soil compaction when changing the driving speed and vertical accelerations of a mobile machine moving on a deformable soil. The influence of parameters and characteristics of the running gear system of the wheeled tractor, as well as the traction load on the value of vertical accelerations when moving along the soil, is determined. The dependence of the influence of vertical accelerations on the dynamic loads on the axle of the tractor front and rear axles is determined. The dependence of the soil density variation caused by the action of dynamic loads from the propulsion of the tractor front and rear axles has been determined.
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Brunetti, Jacopo, Walter D'Ambrogio, and Annalisa Fregolent. "Analysis of the Vibrations of Operators’ Seats in Agricultural Machinery Using Dynamic Substructuring." Applied Sciences 11, no. 11 (May 21, 2021): 4749. http://dx.doi.org/10.3390/app11114749.
Повний текст джерелаАнотація:
The vibrations produced by an agricultural machine are transmitted to the seat of the tractor operator and must comply with the limitations imposed by international and national regulations. An agricultural machine is generally composed of a tractor that can be linked to different machines required to perform a large number of agricultural tasks. In this paper, substructuring techniques are proposed to investigate the dynamics of the agricultural machine and to evaluate the resulting vibration exposure to the tractor driver in different configurations of the machine. These techniques allow one to couple reduced-order models or experimental models of the component subsystems to obtain the response of the whole system. In the results, the vibration exposure of the tractor operator is evaluated for different configurations of the agricultural machine, by observing the frequency response function (inertance and transmissibility) and the transient response to a given excitation. In conclusion, these techniques allow one to investigate a large number of different configurations and a wide range of operating conditions with a light computational burden and without asking the manufacturers to share sensitive design details.
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Idrisova, Yu V., R. G. Kudoyarov, S. I. Fetsak, and A. R. Maslov. "Influence of dynamic processes on the machined surface." Russian Engineering Research 35, no. 12 (December 2015): 887–91. http://dx.doi.org/10.3103/s1068798x15120096.
Повний текст джерела
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Kernytskyy, Ivan, Serhii Baranovych, Serhii Berezovetskyi, Bohdan Diveyev, Orest Horbay, and Ihor Stukalets. "Vibration absorber optimization for boom-sprayer." Przegląd Naukowy Inżynieria i Kształtowanie Środowiska 27, no. 4 (January 10, 2019): 504–15. http://dx.doi.org/10.22630/pniks.2018.27.4.47.
Повний текст джерелаАнотація:
The main task of this work is to analyze optimal design-system of the booms of boom-sprayers. The discrete-continue models of machines dynamics of such wheeled machines as boom-sprayer with elongated boom element with the attachment of dynamic vibration absorbers are offered. The algorithms for vibration decreasing of boom are received. The new vibroabsorbing elements are proposed. The paper contemplates the provision of dynamic vibration absorbers (DVA) of buffered impact masses and particle type. Such originally designed absorbers reduce vibration selectively in maximum vibration mode, without introducing vibration in other modes. The damping results from the exchange of momentum during impacts among the masses and masses and stops as the structure vibrates. A technique is developed to give the optimal DVA’s as single degree of freedom (SDOF) buffered system. The one-digit values are established not only for the dynamic vibration absorber parameters, but also for mechanical parameter of base structure – boom in connection points of the dynamic vibration absorbers. Finally, present research develops the genetic algorithms for optimal design searching by discrete-continuum DVA’s system – base system modeling.
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Latifi, Ahmet, Arsim Abazi, and Astrit Shartari. "The amortization of vibrations on machines - case study." International Journal of Engineering & Technology 6, no. 3 (June 9, 2017): 54. http://dx.doi.org/10.14419/ijet.v6i3.7657.
Повний текст джерелаАнотація:
When determining the static rigidity of the machine, only loads of constant forces are taken into account. However, machine details are not loaded only with static forces but also with external and internal dynamic forces. Components of static forces affect the form errors, while dynamic instability, and as a result of dynamic forces have negative impact on: the severity of processed surface, the wear of the metal cut-ting tool, wear of the machine details and productivity.
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Nazimbekova, A. E., D. A. Tlevlessova, and A. E. Kayrbaeva. "Physical and mathematical model of the processes of a device for processing watermelons." Journal of Almaty Technological University, no. 1 (April 10, 2022): 71–80. http://dx.doi.org/10.48184/2304-568x-2022-1-71-80.
Повний текст джерелаАнотація:
The knowledge of the grinding processes of the pulp of fruits and vegetables is not sufficient. In this article, we examined the processes of destruction, grinding, mixing the pulp of watermelon. The criterion equations of these processes are derived taking into account the indicators of the pulp and peel of the watermelon. The derivation of criteria equations for calculating the characteristics of the processes used in the processing of watermelon fruits is considered. The mechanic-technological basis for calculating and designing machines for processing watermelons for food purposes is outlined. The results of experimental studies to determine the optimal kinematic and structural parameters of these machines are presented. The basic physic mechanical and rheological properties of watermelon fruits are given. One of the tasks set for the researcher was to choose a physical model of the processes of separation of pulp from the crust, destruction, grinding of pulp and mixing of the pulp. The values of these quantities depend both on the kinematic parameters of the dynamic interaction and on the physic mechanical and rheological properties of the fruits of melons. The obtained criteria equations can be used to determine the technological parameters of machines where it is necessary to destroy the fetus with minimal energy costs.
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Rumaherang, Wulfilla M., J. Louhenapessy, Mesak F. Noya, and Cendy S. Tupamahu. "STUDI EKSPERIMENTAL PERFORMANCE KAVITASI WATERJET PROPULSI." ALE Proceeding 4 (August 17, 2021): 112–20. http://dx.doi.org/10.30598/ale.4.2021.112-120.
Повний текст джерелаАнотація:
Cavitation is a complex phenomenon of dynamic processes in hydraulic machines that can cause a decrease in energy performance, vibration and damage the blade surfaces. Analysis of cavitation symptoms in hydraulic machines is carried out through cavitation performance studies, namely the relations between energy parameters. Each hydraulic machine has a critical value on a different cavitation performance curve. Therefore, a study of the effect of cavitation changes is needed to determine the working zone of hydraulic machines without cavitation. In this study, cavitation performance analysis was carried out on a waterjet propulsor model with 5 impeller blades and 7 stator blades using experimental methods. The cavitation coefficient was varied at σ = 2.25 to 0.25 by setting and controlling the inlet pressure on the cavitation test rig. The critical point value will be observed at the point where the thrust coefficient decreased to 3.28%. The results showed that cavitation begins at σ = 1, the critical point is obtained at σ = 0.75. From these studies, we find that waterjet must be operated at conditions where is σ > 0.75.