Кафедра "Інтернет речей"

Постійне посилання колекціїhttps://repository.kpi.kharkov.ua/handle/KhPI-Press/5398

Увага! Поповнення колекції кафедри "Інтернет речей" – призупинено.

Від вересня 2022 року кафедри "Інтернет речей" та "Мультимедійних інформаційних технологій і систем" об’єднані у кафедру "Мультимедійні та інтернет технології і системи".

Первісна назва кафедри – "Розподілені інформаційні системи і хмарні технології".

Переглянути

Зараз показуємо 1 - 20 з 287

About the choice of phase-space coordinates for description of the production systems with in-line type of production
(НТУ "ХПІ", 2016) Pihnastyi, O. M.; Tubychko, K. V.
About the distributed model of composite conveyor
(Kharkiv National Automobile and Highway University, 2018) Nikitina, E. A.; Pihnastyi, O. M.
The problem of energy consumption of composite conveyors is considered. A distributed model of control of production lines is proposed for use. The model of control of composite conveyors in partial derivatives is described. The problem of optimal control of conveyors with leading and driven lines is formulated.
About the kinetic models of controlled production processes
(Національний технічний університет "Харківський політехнічний інститут", 2017) Pihnastyi, O. M.; Likhno, K. V.
About the methods of formalization of technological process
(Брама, 2016) Tubychko, K. V.; Pihnastyi, O. M.
There are mass, serial and single types of production are determined by the coefficient of consolidation of operations at the workplace (GOST 3.1121.84). Mass production is characterized by a type of highly specialized departments and sections on output, limited and stable for a long period of the time range of products. The main objective of planning is to ensure the movement of workpieces on at a given pace of operations. A significant part of the calendar-planned regulations for the type of mass production is sustainable and just laid the basis for the planned regulations of the production lines. Planning is based on the calculation of the rate of release and details of the calculation of interoperable standards groundwork. When a batch type production nomenclature of manufactured products less stable, but still regularly repeated in the release program, the number performed in detail shops operations far exceeds the number of jobs that determines the production of goods parties. Main planning task in batch production, ensuring periodicity of manufacture products in accordance with the scheduled task. Increasing seriality achieved the unification of parts and typed processes. The objective of production planning is to manufacture products on time and uniform loading of production sites for a given production cycle. Each type of production of different methods can be arranged. The main ones are in-line, single party and methods of production. The most effective line method. The set of methods, tools, and principles of organization of the process to form the production planning and control system. Specifically shown what it takes to build a mathematical model of operations.
About the problem of selecting models for production line
(Бердянський університет менеджменту і бізнесу, 2016) Pihnastyi, O. M.; Bondarenko, K. M.
The article presents comparative characteristic of models of industrial production lines operating in transition mode, their advantages and disadvantages are analyzed. For these models the accuracy of calculations of aggregated parameters of industrial production lines is evaluated. The principle of the PDE-models is showed using the statistical theory of describing production systems. The prospects of developing models of industrial production lines that are used in the design of in-line production control systems.
Analysis of a Dataset for Modeling a Transport Conveyor
(2022) Pihnastyi, O. M.; Burduk, Anna
The analysis of the works, which considered the use of neural networks for modeling a multi-section transport conveyor, was carried out. The prospects for the use of neural networks for the design of highly efficient control systems for the flow parameters of a multi-section transport conveyor are studied. The problem that limits the use of neural networks for building control systems for the flow parameters of a multi-section transport conveyor is considered. The possibility of constructing generators for generating a data set for the process of training a neural network is being studied. A method for generating a data set based on experimentally obtained measurements of the instantaneous values of the input material flow as a result of the operation of industrial transport systems is proposed. Using dimensionless variables, a statistical analysis of a stochastic flow of material entering the input of the transport system was performed. An estimate of the correlation time of a stochastic process characterizing the input flow of material is given. The recommendations on choosing the type of correlation function for the model of the input material flow were confirmed. It is demonstrated that the input flow of material is a non-stationary stochastic process. Approximations for modeling the input flow of materials of the operating transport system are considered.
Analysis of dynamic mechanic belt stresses of the magistral conveyor
(2020) Pihnastyi, O. M.; Khodusov, Valery; Kozhevnikov, G. K.; Bondarenko, Tetiana
Controlling the amount of material flow coming from the input accumulate bunker to the input of the conveyor line and controlling the speed of the conveyor belt are common ways to reduce the energy consumption of the transport system. However, most works do not take into account transients associated with a change in the speed of the conveyor belt or a change in the input material flow. As a result of transient processes, acceleration or deceleration of the conveyor belt occurs, and as a result, dynamic stresses arise in the conveyor belt, which can exceed the permissible values. This article examines the dynamic stresses that occur during transient modes. When constructing a model of dynamic stresses, Hooke's law was used. The model of resistance to movement of the conveyor belt is adopted in accordance with DIN 22101: 2002-08. The analysis of the propagation of waves of dynamic stresses in the conveyor belt has been done. The formation of dynamic stresses as a result of the addition of the forward and backward waves is considered.
Analysis of Dynamic Stresses during Acceleration and Deceleration of a Conveyor Belt (Maxwell Element Model)
(2021) Pihnastyi, O. M.; Kozhevnikov, G. K.; Vasyuchenko, Pavel
The wave equation which allows researching the occurrence and the dynamic stress propagation in the conveyor belt is obtained for the conveyor belt, the material of which corresponds to the Maxwell element model. The boundary and initial conditions were written for power switching modes to consider the mechanical characteristics of the asynchronous engine with the phase rotor, which determine the dependencies between the traction torque and the rotational speed of an asynchronous electric engine with a phase rotor. The estimate is given to separate wave equation terms. The expression is obtained for the calculation propagation belt speed of the dynamic stress along the conveyor belt. The conditions are shown by which the wave equation will correspond to the model of Hooke’s element. By designing the dependencies between the traction torque and the rotational speed for a specified interval of the mechanical characteristic, the linear approximation is used. It is shown that the change of the material flow value coming into a section input doesn’t render a special influence on the dynamic stresses propagation process along the conveyor belt. The expressions are obtained for the dynamic stress propagation speed calculation. By deriving the wave equation it is assumed the uneven material distribution along the conveyor section.
Analysis of methods for stabilization flow parameters of the production line
(ТОВ "Планета-Прінт", 2021) Pihnastyi, O. M.
The report discusses methods for stabilizing the flow parameters of a production line with a flow method of organizing production.
Analysis of stress in the conveyor belt (Maxwell-element model)
(Дніпровська політехніка, 2021) Pihnastyi, O. M.; Cherniavska, S. M.
Purpose. For a conveyor belt, the material of which corresponds to the Maxwell-element model, to analyze the causes of the occurrence of longitudinal dynamic stresses and investigate the peculiarities of the propagation of dynamic stresses along the route of material transportation. Methodology. To calculate the value of static and dynamic stresses arising in the conveyor belt, the apparatus of mathematical physics was used. Findings. A wave equation is written that determines the propagation of longitudinal vibrations in a conveyor belt, the material of which corresponds to the Maxwell-element model. An expression is obtained for calculating the speed of propagation of elastic vibrations along the conveyor belt, the frequency of vibrations and their wavelength. The characteristic relaxation time of disturbances is determined. The method of successive approximation was used to solve the wave equation. The estimation of the characteristic time of acceleration of the conveyor belt, at which there is no destruction of the material of the conveyor belt, is given. Originality. PDE-models of conveyor-type transport systems are improved, which are used to design belt speed control systems under restrictions on speed control modes. It is shown that under the modes of acceleration or deceleration of the conveyor belt, the effects associated with the occurrence and propagation of dynamic stresses along the conveyor belt, due to the characteristics of the material corresponding to the Maxwell-element model, are insignificant. Practical value. The results obtained make it possible to determine the limitations on the modes of acceleration or deceleration of the conveyor belt, preventing its damage and increased wear. This opens up prospects for designing effective control systems for the parameters of a conveyor belt, unevenly loaded with material along the transport route.
Analysis of the input material flow of the transport conveyor
(Національний гірничий університет, 2023) Pihnastyi, O. M.; Sobol, Maksym
Purpose. To develop a method for analyzing the material flw entering the input of a conveyor section, based on the decomposition of the input material flw into a deterministic material flw and a stochastic material flw. Methodology. The analysis of experimental data characterizing the input material flw was performed using the methods of the canonical Fourier representation of a random process. Findings. A method for representing a stochastic material flw as a combination of a deterministic process and a stationary random process with ergodic properties is proposed. Originality. The originality of the obtained results lies in the fact that, for the fist time, a method of analysis based on the decomposition of the input material flw for a conveyor section has been proposed, which, unlike the existing methods of input flw typing for the mining industry, will allow us to independently perform deterministic flw typing and stochastic material flw typing in transport conveyors. The proposed approach makes it possible to highlight special characteristics separately for deterministic and stochastic material flws. This will make it possible to use the obtained regularities to increase the accuracy of the conveyor model and will accordingly increase the quality of the belt speed control systems and the flw of material coming from the input bunker. The obtained results are of particular importance due to the fact that the characteristics of the deterministic material flw are directly related to the technical or technological factors of material extraction. Practical value. The obtained results allow determining statistically stable regularities for the incoming flw, which makes it possible, based on these regularities from the set of available control algorithms, to choose the optimal control algorithm for the parameters of the operating conveyor section. This allows reducing the enterprise’s energy costs of the transportation of material. The proposed method can be successfully applied to build random number generators simulating the sequence of values of the input flw of material. The developed generators can be used both for validating existing belt speed control systems and creating new control systems based on neural networks. This opens perspectives for the design of effctive systems for controlling the flw parameters of transport system, based on the transport conveyor model, which takes into account the stochastic nature of the incoming material flw.
Analysis of the models transition processes controlled manufacturing
(НТУ "ХПИ", 2016) Pihnastyi, O. M.; Bondarenko, K. M.
An Analytical Method for Generating a Data Set for a Neural Model of a Conveyor Line
(Institute of Electrical and Electronics Engineers, Inc., USA, 2020) Pihnastyi, O. M.; Kozhevnikov, G. K.; Bondarenko, Tetiana
Models using neural networks are a rather promising class of models for designing highly efficient control systems for a dynamic distributed transport system of the conveyor type. An important problem in constructing a model of a conveyor-type transport multi-section system is the formation of a data set for training a neural network. This study discusses a method for generating data for training a neural network based on an analytical model of a conveyor-type transport system. A detailed analysis of the most common models of the transport conveyor is performed and the choice of an analytical model for the formation of a training data set is theoretically justified. An algorithm for calculating the flow parameters of individual sections of the transport system is proposed. An estimation of the transition period is given. Graphical representation of a data set for training a neural network using an analytical model of a transport system is demonstrated.
Analytical methods for designing technological trajectories of the object of labour in a phase space of states
(Національний гірничий університет, 2017) Pihnastyi, O. M.
Purpose. The development of analytical methods for designing technological motion trajectories of objects of labour in the state space with the purpose of construction of closed PDE-models, used to describe the manufacturing system. Methodology. For derivation of an equation of the labour object movement in the phase space of states, there has been applied a mathematical tool and the variational calculation methods of analytical mechanics. Findings. An equation of labour object movement in the state of space has been derived and motion integrals, related to the uniformity of time and state space have been considered. Originality. PDE-models of manufacturing systems, used for the engineering of the high performance manufacturing control systems have been improved. The offered model of technological resources transfer to the object of labour is based not on the traditional phenomenological description of the static production phenomena, but on conservation laws, which characterize the transfer process of technological resources to the object of labour and space-time structure of the manufacturing process. It allowed deriving the equation of the objects of labour movement along the manufacturing route, followed by the construction of non-steady-state equations of the PDE models on their ground for the description of the parameters status of the manufacturing process. While deriving the equations of the technological path of movement of the object of labour there were taken into consideration differential constraints, being applied by the manufacturing system to the transfer process of technological resources of the objects of labour, resulting from their interaction with production equipment and against each other in the course of transfer from one manufacturing operation to another. Practical value. Methods for driving the equation of technological path of the object of labour allow developing high-quality models of the transfer processes of the manufacturing system, which are the basis for the high quality enterprise management system engineering with a straight flow method of industrial organization.
Application of statistical theory for mass product output mathematical models
(2007) Pihnastyi, O. M.; Khodusov, Valery; Demutsky, Victor
An approximate method for constructing linear regression models for prediction of a severe bronchial asthma course
(Institute of Electrical and Electronics Engineers, Inc., USA, 2021) Pihnastyi, O. M.; Kozhyna, O. S.
Diagnosis of a bronchial asthma course in children determines further preventive activities and personalized approaches to treating a child with such pathology. An uncontrolled type of asthma course requires conducting a careful analysis of the factors affecting the formation of severe forms of the disease. The use of linear regression models is a widespread approach that helps to calculate the probability of severe bronchial asthma or the uncontrolled course of the disease development. During this study, 90 children aged from 6 to 18 years old were examined. Of these, there were 70 children suffering from bronchial asthma with different severity and 20 healthy children. The examination included an interviewing of patients as well as a definition of clinical features and results of clinical and laboratory examination in the disease course. 142 factors were analyzed to build a three-parameter model. A correlation ratio and numerical characteristics of model regressors were calculated. Conditions of the use of approximate linear regression models were shown and the model accuracy was estimated. A technique of an approximate model of linear regression building both in dimensional and nondimensional forms was considered. The relationship among model ratios was shown.
Calculation of the parameters of the composite conveyor line with a constant speed of movement of subjects of labour
(National Mining University, 2018) Pihnastyi, O. M.; Khodusov, V. D.
The development of analytical methods for calculating the parameters of a composite conveyor line using the models containing partial differential equations. To calculate the parameters of the conveyor line with a constant speed of movement of subjects of labour, the apparatus of mathematical physics is used. The solution is given in an analytic form that specifies the state parameters of the production line for a given technology's position as a function of time. The scientific novelty of the results is the improvement of PDE-models of production systems of a conveyor type. The method for calculating the parameters of conveyor production, consisting of two connecting conveyor lines with a constant speed of movement of subjects of labour is offered. The considered method of calculation of conveyor production can be extended in case of a system with an arbitrary number of connecting conveyor lines. The practical significance lies in the fact that the proposed method for calculating the parameters of conveyor production can be used to design control systems for conveyor production with an arbitrary number of conveyor lines. An essential advantage of this method is that each conveyor line is described by a single partial differential equation, the solution to which is obtained analytically. Such a representation makes it possible to use solutions for predicting the state parameters of a production line.
Calculation of throughputs of intermediate centers in three-index transportation problems
(Технологический Центр, 2017) Raskin, L.; Sira, O.; Karpenko, V.
A transportation problem of linear programming with intermediate centers was considered. For cases where throughputs of intermediate centers are not specified, a problem of calculating rational distribution of the total throughput in order to minimize the average value of total transportation costs has been stated. Several options of constructing the method for solving the problem were proposed. The first option implements the iterative procedure of successive improvement of the initial distribution of throughputs of the centers by the Nelder-Mead method. Increase in speed of this method was achieved using the duality theory. The second option is based on a preliminary solution of the problem of finding optimal routes for all pairs "supplier-consumer" taking into account a possible intermediate center. In this case, the usual two-index transportation problem of delivering products from the system of suppliers to the system of consumers arises. The optimal plan of this task contains necessary data to calculate required throughput for each of the intermediate centers. Advantage of this method consists in the possibility of its effective propagation for solving problems with a multilayered structure of intermediate centers.
Choosing the optimal quantity of factors for prediction the severity of bronchial asthma in children using linear regression models
(2021) Pihnastyi, O. M.; Kozhyna, O. S.; Kulik, Tetiana
The severity of the course of bronchial asthma depends on many factors. Clinical and laboratory studies were carried out on 90 children aged 6 to 18. 70 children with bronchial asthma of various degrees of severity as well as 20 healthy school-aged children were included into the main group. 142 predictors were studied, 11 factors were selected from the bottom in accordance with the selection method. Multivariate linear regression models have been developed and analyzed to predict the severity of bronchial asthma disease. The dependence of the forecast quality of the observed value on the number of model regressors is analyzed. The MSE value was used as a characteristic of forecast quality. An estimate of the number of regressors required for a significant increase in the forecast quality is presented. The law of distribution of the error in predicting the severity of bronchial asthma disease in a multifactorial linear regression model has been substantiated. The visual representation of multivariate models is made using the residual plot.
Conceptual positions statistical modeling of production processes. Building PDE-models
(Національний технічний інститут "Харківський політехнічний інститут", 2014) Pihnastyi, O. M.; Krasovskykh, Karina
In work formulated the concept of statistical modeling of technological processes of production and technical systems. In conformity with this concept, the state macroparameters of the technological process are determined by the state microparameters a large number of objects of labor, distributed in interoperation reserves on the technological route. It is shown that at a sufficiently large number of objects of labor located in interoperation reserves along the technological route, appear special type laws characterizing state macroparameters of the technological process. The characters of these laws do not depend on the behavior of microparameters which determine the state of an individual item of work. Although the with increasing amounts the objects of labor unimaginable increases complexity and intricacy of relations which determine the state macroparameters of the technological process, however, at that appear the peculiar laws which on no account can not be reduced to the laws of behavior of an individual element of a macroscopic system.