Черкаський державний технологічний університет ПрО Один з МетОдІв ПОБудОви МатеМатичнОї МОдеЛІ знОСОСтІйКОСтІ ПЛІвКОвих ПОтенЦІОМетрІв анотація. Стаття присвячена побудові математичної моделі зносу контактних пар ковзання плівкових потенціометрів, що описує функціональні зв'язки вихідних параметрів з основними процесами роботи. Фізичні явища, що виникають в електричних контактних парах ковзання плівкових потенціометрів відносяться до недостатньо вивчених багатофакторних процесів. Одним з основних факторів тут є величина і рід струму, що породжують електричні розряди, електричну та місткову ерозії, місцеве нагрівання, розплавлення і перенесення металу, що погіршують стан контактуючої поверхні і надійності контактування Для дослідження таких процесів в наш час широко використовується метод ідентифікації, що дозволяє поєднувати наявну неповну гносеологічну і отриману дослідним шляхом стохастичну інформації. З метою визначення оцінки зносу електричних контактних пар плівкових потенціометрів були використані енергетичні критерії. Запропоновано також методику оцінки додаткового зносу контактної пари плівкових потенціометрів під струмом. Отримані рівняння можуть бути використані для аналізу роботи рухомих електричних контактних пар працюючих без мастила. Ключові слова: контактні пари ковзання, математична модель, плівкові потенціометри, динаміка електричних процесів, електрична ерозія. Sytnyk oleksandr, Kyselov vladlen, Kyselova hanna Cherkasy State Technological University on one of the MethodS foR conStRucting a MatheMaticaL ModeL of the weaR ReSiStance of fiLM potentioMeteRS Summary. The article is devoted to the construction of a mathematical model of wear of contact pairs of sliding film potentiometers, describing the functional relationships of output parameters with the main processes of operation. Physical phenomena that occur in electrical contact pairs of sliding film potentiometers belong to insufficiently studied multifactorial processes. One of the main factors is the magnitude and type of current. The current generates electrical discharges, electrical and bridge erosion, local heating, melting, and metal transfer. This improves the condition of the contact surface and the reliability of the contact. Mechanical processes in the contact zone caused by dynamic modes of contact steam operation. This determines the dependence of the transient resistance on the magnitude of contact pressures and stresses, the type of deformation processes in the contact material, the magnitude of shock and vibration loads associated with movement, the speed of movement of current collectors, the coefficient of friction, and other mechanical factors. For the study of such processes, the identification method is widely used nowadays, which allows combining the available incomplete epistemological and empirically obtained stochastic information. Depending on the magnitude of tangential stresses and the state of the surfaces of bodies that connect at the point of contact, all three types of deformation processes can occur: elastic ...

The publication presents the most common and promising models and schemes for replacing the power supply system of industrial enterprises, and an example of their use in practice for power supply to sewage treatment plants of a chemical enterprise. Various types of models are considered (in tabular form, in the form of an electrical replacement circuit or in the form of a finite-state machine), as well as a logical-probabilistic approach to the representation of the power supply system. The use of automation systems in power supply systems of industrial enterprises can reduce the total number of accidents, prevent their development, reduce the time of disconnections of electrical installations and downtime of mechanisms, and also allows to transfer to work without constant maintenance a significant number of electrical installations of substations, which, in turn, leads to a reduction in the number of service personnel, increase labor productivity and reduce maintenance costs. One of the main tasks on the way to automating the power supply system of enterprises is to present it in the form of a model. The list of replacement models and schemes that can be used to represent the power supply system of enterprises is quite large, and choosing the appropriate model, for that best meets the requirements of the final goal is quite a complex scientific task. The purpose of this article is to analyze the most common and promising models and schemes for replacing the power supply system and provide recommendations on their application in practice for power supply to sewage treatment plants of a chemical enterprise. Presenting the power supply system in the form of a table allows you to simplify and visually perform certification of electrical equipment, identify problem and weak points in the power supply system of industrial enterprises. Such a table proves that a large amount of electrical equipment at lower levels depends on a single electrical device at higher levels. The representation of the power supply system in the form of a three-phase symmetric replacement circuit can be used to calculate short-circuit currents in symmetric and unbalanced modes in the MatLab program and similar. Using the model of the power supply system in the form of a finite-state machine allows you to visually check the reliability of power supply to consumers, simplify the design of the power supply system of an industrial enterprise, select the state of switching devices in the power supply system and take into account the advantages and disadvantages of each state. It is advisable to use the methods discussed in this article to represent the power supply system (in tabular form, in the form of a finite-state machine or a three-phase symmetric replacement scheme) and their further application and use in automated power supply systems of industrial enterprises. The logical-probabilistic method allows us to consider the issue of power supply reliability based on the theory of logical algebra.

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