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".

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The problem of combined optimal load flow control of main conveyor line
(Technical University of Kosice, 2022) Pihnastyi, O. M.; Khodusov, V. D.; Kotova, Anna
The combined method of flow parameters control of conveyor transport system is researched in this article. A transport system a distributed model with input accumulative bunker is developed for the optimal control synthesis. The transport system model is presented in dimensionless form. Expressions are obtained that determine the states of flow parameters along the transport route. The amount of transport delay was calculated for each technological position of the transport route at an arbitrary point in time. A system of characteristic equations is written down, the solution of which determines the trajectory of movement of a separate element of the transported material. Conditions are considered under which the material output flow does not depend on the initial filling of the conveyor section with the material. The algorithm of optimal control development of the material flow rate at the output from the accumulative bunker and the conveyor belt speed, which ensures the minimum deviation of the output cargo flow from a planned amount, is given. The optimal control algorithm takes into account the restrictions on the control modes of flow parameters and the volume of the accumulating bunker. It is shown that the developed control algorithm ensures the maximum filling of the transport system with material and forms a uniform distribution of material along the transportation route.
Modelling the dynamics of production line control systems in the context of technological safety
(Akademia Pomorska, 2019-06-14) Pihnastyi, Oleh; Khodusov, Valery
The report analyzed the multi-section conveyor systems and made a forecast of technological accidents of transport systems. The causes of technological accidents are shown.
Synthesis of algorithms for stabilization ofthe level of inter-operative backlogs of the production flow line
(Національний технічний університет "Харківський політехнічний інститут", 2020) Pihnastyi, O. M.; Khodusov, V. D.
The report discusses methods for constructing algorithms for optimal stabilization of the value of inter-operational backlogs of the production flow line.
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.
Application of statistical theory for mass product output mathematical models
(2007) Pihnastyi, O. M.; Khodusov, Valery; Demutsky, Victor
To a question on application of the statistical theory for the description of industrial systems
(2009) Khodusov, V. D.; Pihnastyi, O. M.
The application of the methods of Statistical Physics for its description is possible owing to the representation of the manufacturing firm with mass production output as a system with a large number of elements (the basic products) of stochastic nature, which is in the production process. The behavior of the basic products along the technological chain depends on the definite manufacturing and technological laws in accordance with the technological process of the manufacturing firm, its production plan, the availability of manpower resources and equipment. The state of the production system’s basic products at any instant of time is given as the point in two-dimensional phase space. The function of the basic product’s distribution in the rate of expense’s variation is set and the equation similar to the kinetic equation in Physics is written down. The engineer-production function, which is analogous to the force moving the basic product along the technological chain of the production process, is set and can be determined from the technical documentation of the manufactured article approved in the manufacturing firm. The producer function, which describes the interaction of the basic products (the system’s elements) during their moving along the technological chain of the production process with technical equipment, is based on the equipment disposition schemes and its technical characteristics according to the operating mode of half-finished products. Using the kinetic equation a closed system of balances equations is written down in a zero approximation on a small parameter for the moments of the distribution function. The system of balances equations describes the behavior of the basic economic macroscopic quantities of the production system, such as reserve, pace, and dispersion of the production output along the technological chain. From the balances, equations were obtained the well-known relations in business operation theory for the calculation of reserves and places of the production output.
The statistical theory of industrial systems
(2009) Khodusov, V. D.; Pihnastyi, O. M.; Mikhailenko, V.; Didichenko, N.; Dubrovin, A.
The dynamic model of conveyor belt stresses
(2020) Khodusov, V. D.; Pihnastyi, O. M.; Kozhevnikov, G. K.
The article considers the causes of dynamic stress when moving a conveyor belt with a material. The main factors of the occurrence of the dynamic resistance in the conveyor system are defined. It is demonstrated what the propagation speed of perturbations substantially depends on the loading level of the conveyor system with the material. When constructing a model of dynamic stresses, Hooke's law was used, which is an accurate approximation for most sol-id bodies, as long as the forces and deformations are small enough. The main attention in the article is given to the causes of dynamic stresses at the start of the conveyor system. When calculating the deformations, the inertia forces of the moving material and tape are taken into account. The analysis of the appearance of dynamic stresses at a constant value of the conveyor belt acceleration and the linear nature of the change in the value of the conveyor belt acceleration was carried out.
Статистическая теория описания производственно-технических систем
(Харківський національний університет ім. В. Н. Каразіна, 2010) Пигнастый, Олег Михайлович; Ходусов, Валерий Дмитриевич
Hydrodynamic Kelvin-Voigt model transportation system
(Харківський національний університет ім. В. Н. Каразіна, 2020) Pihnastyi, O. M.; Khodusov, V. D.
The hydrodynamic Kelvin-Voigt model of production systems with a flow method of organizing production is considered. The main macro parameters of the state of the production line and the relationship between them are determined. The analysis of the main characteristics of models of elastic elements, which are used to analyze the occurrence of the dynamic stresses in a moving conveyor belt, is presented. A boundary value problem for elastic longitudinal vibrations in a conveyor belt with a moving material is formulated. It is assumed that the deformation of the conveyor belt element corresponds to the Kelvin-Voigt model and there is no sliding of the moving material on the belt. When determining the forces of resistance to motion acting on an element of the belt, the recommendations of DIN 22101: 2002-08 were used. The analysis of the Kelvin-Voigt model of the elastic element is carried out and the distinctive features of the model are demonstrated. The justification of the choice of the Kelvin-Voigt model of an elastic element for describing the process of occurrence of the longitudinal vibrations in a conveyor belt is given. The dependence of the non-uniform flow of material and the magnitude of tensions in the belt is estimated. An expression is written for the speed of propagation of disturbances along a moving conveyor belt with the material. The reasons for the acceleration and deceleration of the conveyor belt associated with the uneven supply of material at the entrance of the transport system are determined. The relationship between the speed of a conveyor belt and the mass of material along a section of the conveyor is demonstrated. It is shown that an increase in the power of the electric motor at the start and acceleration of the conveyor belt, as well as a decrease in power during the braking and stopping of the conveyor belt, is the cause of the appearance of dynamic stresses in it. The characteristic phases of the initial movement of the conveyor belt with the material are analyzed. The process of occurrence of dynamic tensions with the constant and variable acceleration of the conveyor belt for the phase of acceleration and deceleration of the conveyor belt is investigated. For the analysis, a dimensionless model of a conveyor line was used. An expression is obtained for static and dynamic tensions in the conveyor belt. The amplitude of oscillations of dynamic stresses and the characteristic time of damping of oscillations in a conveyor belt is estimated. A quadratic dependence of the speed of damping of a wave of dynamic tensions with an increase in the oscillation frequency is demonstrated. An inversely proportional dependence of the characteristic decay time of the generated dynamic tensions on the value of the viscosity coefficient of the composite material of the conveyor belt is shown.