Вісник Харківського національного автомобільно-дорожнього університету / Вестник Харьковского национального автомобильно-дорожного университета

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A frequency determination method for automotive nanosensors
(Харківський національний автомобільно-дорожній університет, 2021) Gurko, A. G.; Sergiyenko, O. Yu.; Гурко, Олександр Геннадійович; Сергієнко, Олег Юрійович
The growing popularity of nanosensors in various automotive applications requires new methods for counting the frequency of electrical signals, into which the measured non-electrical parameters are converted. This need is because automobile nanosensors are to register very small changes in the measured parameters that, besides, can change very fast. The paper proposes for use in automotive nanosensors a frequency calculation method based on the principle of rational approximation, which meets the above requirements.
The acquisition of intercultural competence in language courses
(Харківський національний автомобільно-дорожній університет, 2019) Samarina, V. V.; Shamrai, O. V.; Самаріна, В. В.; Шамрай, О. В.; Самарина, В. В.; Шамрай, Е. В.
This thesis deals with teaching foreign language and the importance to develop intercultural skills and know-how which include the ability to bring one’s own cultural origins and the for-eign culture into relation with each other, together with the ability to understand and empathize with the values and conditions of others. The language learner needs to develop other skills than sociocultural knowledge and have to improve interpersonal relations and develop intercultural awareness.
ACTIVITY-COMPETENCE APPROACH TO EDUCATION OF FUTURE ENGINEERS
(Харьковский национальный автомобильно-дорожный университет, 2016) Ponikarovska, S.; Поникаровская, С. В.; Понікаровська, С. В.
The essence of the activity-competence approach to higher education is dealt with, which promotes formation of essential for professional activity qualities, knowledges and skills, helping to fulfil professional duties in the chosen area.
ADVANTAGES OF EUROPEAN METHODS OF TEACHING FOREIGN LANGUAGES FOR UKRAINIAN TECHNICAL UNIVERSITIES
(Харьковский национальный автомобильно-дорожный университет, 2017) Hrichchina, A.; Гриччина, А. В.; Гріччіна, А. В.
The necessity and advantages of European methods of teaching foreign languages in Ukrainian technical universities, in particular the Engage-Study-Activate method (ESA), have been considered in the article. Types of tasks for each of the phases of the class have been analyzed. Examples of tasks for the phase of engagement and activation have been given.
Application of fuzzy aggregation norms in vocational guidance for law graduates
(Харьковский национальный автомобильно-дорожный университет, 2018) Mreła, A.; Sokolov, O.
Higher education institutions want to help their graduates to find a job, which is more relevant to their personal traits. The law graduates can apply for a job for a great variety of positions. Some of them require dealing with clients every day, like for example an attorney, and the oth-ers demand preparing legal documents individually. Graduates also differ due to willingness and capacity of working with people or preparing documents alone. The paper presents the mathematical model of an information system designed for analyzing the graduates traits and different job requirements to help the law graduates choose the kind of job to apply to it. The model is based on fuzzy aggregations norms.
Approaches to web application performance testing and real-time visualization of results
(Харківський національний автомобільно-дорожній університет, 2022) Ushakova, Iryna; Plokha, Olena; Skorin, Yuri; Ушакова, Ірина Олексіївна; Плоха, Олена Борисівна; Скорін, Юрій Іванович
Problem. Today, performance testing is an integral part of the web applications quality assur-ance whose performance failures and performance issues affect the business of their owners. Goal. The goal of the work is to generalize approaches and methods to improve the quality of web applications and develop recommendations for improving performance testing using open source tools. The object of research is the processes of testing web applications. The subject of research is the approaches, methods and tools of performance testing. Methodology. The study identified the impact of software performance testing on its quality and its main types, namely load testing, stress testing, volume testing, stability testing. The main stages of performance test-ing and their content were identified. To implement modern automated testing technologies, the advantages and disadvantages of the most popular tools for testing performance in the modern IT market and continuous visualization of their results were analyzed and identified. The follow-ing factors should be considered when selecting a performance testing tool: compatibility, scalability, clarity, and monitoring. Time series databases and visualization tools are used for continuous monitoring of test results together with testing tools. Results. During the practical implementation of the research results, the goals of different types of performance testing, indi-cators of normal operation of the system without exceeding the permissible limits, test scenarios and test results were identified. Visualization of test results in JMeter is shown and a board for continuous real-time visualization is created. Originality. The originality of the study lies in un-locking the potential of open source tools for testing the performance of web applications and visualizing its results. On the basis of comparative analysis the spheres of application of tools for performance testing are substantiated. Practical value. The practical value lies in the devel-opment of methodological bases for testing the performance of web applications in real time on the example of the connection of tools Jmeter ¬– InfluxDB – Grafana.
Cloud сomputing автомобільного трансферу та утримання доріг
(Харківський національний автомобільно-дорожній університет, 2019) Алексієв, О. П.; Алексієв, В. О.; Неронов, С. М.; Хабаров, В. О.; Алексеев, О. П.; Алексеев, В. О.; Неронов, С. М.; Хабаров, В. О.; Aleksiyev, O.; Aleksiyev, V.; Neronov, S.; Khabarov, V.
Розглядається проведення фундаментальних та прикладних досліджень у галузі синергетики, телематики та мехатроніки автомобільних комп’ютерних систем. Оцінено створення програмно-апаратного забезпечення віртуального управління, його інтелектуалізація. Застосовано віртуальне управління транспортного або дорожнього підприємства. Наукова та практична основа – своєрідна віртуальна логістика автотранспортної системи з транспортним порталом ХНАДУ http://ikt.khadi.kharkov.ua.
Collisions of particles in limited space analyzed by molecular dynamics methods
(Харьковский национальный автомобильно-дорожный университет, 2018) Ungson, Y.; Burtseva, L.; Garcia-Curiel, E. R.; Valdez Salas, B.; Flores-Rios, B. L.; Werner, F.; Levterov, A.; Petranovskii, V.
The objective of this work is to propose a model to obtain velocities and directions when spherical hard-bodies collide by Molecular Dynamics (MD). The simulation was executed in MATLAB, the results: packing-fraction, radial distribution functions and collisions frequencies, are presented.
COMPARATIVE ANALYSIS OF GASEOUS FUELS COMBUSTION HEAT
(Харьковский национальный автомобильно-дорожный университет, 2011) Voronova, Ye.; Pozdnyakova, O.; Ilіuyshchenko, A.; Воронова, Е. М.; Позднякова, Е. И.; Илющенко, А. Н.; Воронова, Є. М.; Позднякова, О. І.; Ілющенко, А. М.
The estimation of the calorific value of gaseous fuels such as pyrolysis gas, biogas, landfill gas, natural shale gas was done. The results showed that the calorific value of pyrolysis gas was comparable to the calorific value of biogas and shale gas.
COMPLEX ECOLOGICAL ASSESSMENT OF AEROINDUSTRIAL LOADING IN THE AREA OF CEMENT ENTERPRISE INFLUENCE
(Харьковский национальный автомобильно-дорожный университет, 2011) Valter, G.; Voronova, Ye.; Perekhrest, A.; Вальтер, Г. А.; Воронова, Е. М.; Перехрест, А. С.
Dynamic changes of major components of forest ecosystems in relation to distance from the plant as a loading factor on the environment are considered.
Cучаcні інтерактивні методи навчання в галузі алгоритмізації та тестування програмного забезпечення як концепція підвищення ефективності навчального процесу
(Харківський національний автомобільно-дорожній університет, 2021) Скорін, Ю. І.; Щербаков, О. В.; Skorin, Yuri; Shcherbakov, Alexander
Визначено, що впровадження концепції сучасної вищої школи вимагає глибокого аналізу підго-товки кадрів усіх сфер вищої освіти, що сприяє створенню нових підходів в організації навчаль-ного процесу в закладах вищої освіти з використанням сучасних методів навчання, зокрема активних й інтерактивних методів, які нині набувають провідного значення. На основі здійс-неного аналізу спеціальної літератури та узагальнення практичного досвіду підготовки фахівців у ЗВО були розглянуті декілька активних методів навчання, орієнтованих на активну участь саме студента в саморозвитку з огляду на його особистості. Зазначено, що організація інтера-ктивного навчання передбачає вирішення творчих завдань і проблем, моделювання життєвих ситуацій тощо. Під час аналізу доведено, що використання активних та інтерактивних мето-дів навчання в процесі підготовки майбутніх фахівців сприяє як активізації пізнавальної діяль-ності студентів, так і якісному засвоєнню навчального матеріалу та навичок командної робо-ти, досягненню рівня високої професійної компетентності.
Dependence of the properties of the Fe-Cr-Ni alloy on the composition and properties
(Харківський національний автомобільно-дорожній університет, 2024) Hlushkova, D.; Глушкова, Д. Б.
This study employed a multifractal approach to assess the heterogeneous structure of the Fe-Cr-Ni alloy. Goal. The calculation of the spectrum of dimensionalities for microstructural elements (pearlitic matrix, carbides, and graphite) was conducted using the Rényi formula. Methodology. New relationships were established between the structure and properties of the alloy (such as hardness and impact strength), which are described by models allowing prediction of properties from microstructure images. Results. Most of the derived correlations exhibit a linear nature, indicating that not only does the percentage content of a particular structural element influence its properties, but also the shape of the element, as characterized by its fractal dimension, contributes to those properties. Analytical method that can be useful for assessing and improving the characteristics of alloys. Practical value. The essence of the work has a practical value particularly when precise determination of properties is critically important for their application in various fields of science and engineering.
Determination of the influence of the geometric parameters of rope blocks on the durability of the rope
(Харківський національний автомобільно-дорожній університет, 2023) Fidrovska, Nataliia Mykolaiivna; Karavan, Ruslan Andriyovich; Ptushka, Anastasiia Serhiivna; Yazlovytska, Olena Volodymyrivna; Фідровська, Наталя Миколаївна; Караван, Руслан Андрійович; Птушка, Анастасія Сергіївна; Язловицька, Олена Володимирівна
Problem. The durability of crane ropes is very important, as it ensures not only the main costs of operating the lifting machine, but also the safety of loading and unloading operations The operating conditions of the rope have a very significant effect on the period of its use, but they are not always taken into account. Yes, the method of calculating the rope, which is reflected in the standard, does not take into account the operating conditions of the rope, so it is very difficult to accurately predict its durability. In modern educational and reference literature, the influence of the size and geometry of rope blocks on the durability of lifting ropes is underestimated. The main criterion that is taken into account when choosing a rope according to existing methods is the tensile strength of the rope, although as shown by the research of many famous scientists, the wires of the rope break precisely as a result of bending on the blocks and the drum. The diameter of the block is selected depending on the diameter of the rope and the mode of operation of the lifting mechanism. The material of the block and its geometry are not taken into account at all when choosing the type of rope and its diameter, while the wear of the surfaces of the rope and the block greatly affects the durability of these elements of the lifting mechanism. Determining the factors that affect the wear of the rope and the reduction of its durability is quite an important task and requires not only theoretical, but also experimental research. At the same time, ropes of different designs and diameters were considered. At the same time, ropes of different designs and diameters were considered. This made it possible to evaluate the influence of various elements of the rope and the block on the predicted durability of the rope. The conducted research made it possible to improve the formula of B. Kovalsky, which he proposed for choosing the diameter of the rope according to the service life. The dependence of the influence of the opening angle of the block groove, which is determined from the condition of the reduction of rope torsion during its deviation, on the durability of the rope was obtained. In order to obtain a more realistic picture of the load of the rope that bends on the block and drum, the calculation scheme was improved and the number of factors that have a significant impact on the durability of the rope was increased. The results of the research significantly bring the rope load conditions during bending on the block and drum closer to real values.
Development and properties of new powder materials
(Харківський національний автомобільно-дорожній університет, 2024) Hlushkova, D.; Глушкова, Д. Б.
The study analyzed powder materials to obtain wear-resistant coatings. Field tests for wear resistance were conducted using the method of friction between two surfaces. The tests were carried out on the universal test bench SMC-2 at a rotation speed of 200 rpm. A pressure of 100 kgf was applied to the test sample. Goal. The wear resistance test cycle comprised 200,000 revolutions, with lubrication provided through the drop method. Special powders were used in the experiment, including PG-SR3, PN55T45, and PR-Ni70Cr17S4R4 + 20 % PT-Al5N with a PT-Al5N under layer. Methodology. The selection of wear-resistant coatings was based on the analysis of the following properties: adhesion strength of the coating to the base material, wear resistance of the coatings, hardness, and porosity. Results. Metallographic analysis of the structure of plasma coatings obtained from powders PG-SR3, PN55T45, and PR-Ni70Cr17S4R4 + 20% PT-All5N with three different plasma heater power levels (10 kW, 15 kW, and 20 kW) indicated that the densest and most reliable coating among those studied is the coating made from PR-Ni70Cr17S4R4 + 20 % PT-Al5N powder. Practical value. Therefore, there is no need to increase the heater power beyond 15 kW when spraying this type of powder. The research concluded that when obtaining wear-resistant coatings, the optimal choice is PR-Ni70Cr17S4R4 + 20 % PT-All5N powder with a PT-Al5N under layer.
Development of grammatical activities In a digital learning environment
(Харьковский национальный автомобильно-дорожный университет, 2018) Samarina, V.; Shamrai, О.; Самаріна, В. В.; Шамрай, О. В.; Самарина, В. В.; Шамрай, Е. В.
The article aims at highlighting the usefulness of grammatical explanations when associated with prototypes of actual productions of utterances. At the same time, textual functions of grammatical markers will be associated to complete the analysis of the textual structure.
Experimental and theoretical determination of the duration of surface runoff formation
(Харківський національний автомобільно-дорожній університет, 2021) Havryshchuk, V. V.
There are theoretical and experimental results of the study of the duration of surface runoff formation presented. The prospects of application of this method are defined at designing of sanitary technical measures on highways of public use and artificial constructions. There is prospective direction of increase of efficiency of sewerage rain network designing and local treatment facilities on highways defined. The issue of increasing the accuracy of hydraulic calculation has been studied. The main advantages of implementation of modern drainage solutions are investigated. It is proposed to use a monogram to determine the duration of the formation of surface concentration, in accordance with climatic characteristics.
FEATURES OF LASER BORATING OF PISTON RINGS
(Харьковский национальный автомобильно-дорожный университет, 2017) Glushkova, D.; Makovyey, R.; Ryzhkov, Yu.; Demchenko, S.; Глушкова, Д. Б.; Маковей, Р. Г.; Рижков, Ю. В.; Демченко, С. В.; Глушкова, Д. Б.; Маковей, Р. Г.; Рыжков, Ю. В.; Демченко, С. В.
Piston rings in the process of operation are subject to wear. Non-sufficient wear resistance of piston ring materials often limits the growth of productivity of machines and the timing of their operation. Use of laser heating at boriding provides the formation of a new layer with special properties. The research results can be extended to other parts subject to intensive wear.
FOREIGN LANGUAGE TEACHING OF FUTURE ENGINEERS: PROFESSIONALLY-ORIENTED APPROACH
(Харьковский национальный автомобильно-дорожный университет, 2016) Chevychelova, O.; Чевычелова, Е. А.; Чевичелова, О. О.
In the article the peculiarities of foreign language teaching at higher technical school are described, the importance of professionally-oriented approach to foreign language teaching is grounded and its essence is analyzed. The ways of implementing professionally-oriented ap-proach in higher technical education are considered.
Generalized relation of bitumen stress at shear to its penetration in a range from softening point temperature to breaking point temperature
(Харківський національний автомобільно-дорожній університет, 2022) Zolotaryov, Victor; Золотарьов, Віктор Олександрович
The problem of assessing the quality of bitumen is in the fact that the common quality indicators are empirical. They do not allow the objective characterization neither the consistency of bitumen no its transition from one state of matter to other. Goal. The solution to this problem is based on the principle that the resistance of bitumen to the penetration of the needle is a shear characteristic under conditions of complete adhesion to the surface of the needle. Methodology. The practical confirmation of this approach is based on the Core & Laurent method, which takes into account the rate of the bitumen layer and the resistance force to this displacement based on the geometric parameters of the needle and the force applied to it. Attempts to estimate bitumen viscosity with the depth of needle penetration have failed for two reasons. Firstly, bitumen viscosity is principally a technological characteristic. Secondly, in the simple conversion of the penetration value into viscosity neither the shear rate nor flow anomalies and a units ratio were taken into account. Results. In this research work the shear stress at penetration at the softening point temperature and breaking point temperature is taken as a mechanical characteristic of the states of matter. This statement of the problem is based on the linearity of the relationship between the test temperature and log of penetration, established by Hekelom. Later, this relationship was supplemented with a temperature of equal penetration T31 as a midpoint of the plasticity interval of bitumen with the same penetration but different penetration indexes. Practical value of this work is results in finding the relation between penetration and the reverse pliability G*/sin φ, which is applied in the Superpave system to evaluate the bitumen component in the rutting resistance of asphalt concrete.
Improving wear resistance of responsible hydraulic hammer details with ion-plasma treatment
(Харківський національний автомобільно-дорожній університет, 2020) Glushkova, D. B.; Ryzhkov, Yu. V.; Kostina, L. L.; Chigrin, A. A.; Stepanyuk, A. I.; Глушкова, Д. Б.; Рижков, Ю. В.; Костіна, Л. Л.; Чигрин, А. О.; Степанюк, А. І.; Глушкова, Д. Б.; Рыжков, Ю. В.; Костина, Л. Л.; Чигрин, А. А.; Степанюк, А. И.
Details of the hammer during operation are subject to wear, which leads to a decrease in their service life. In accordance with the literature data in the practice of engineering uses many methods of hardening, which do not give a significant effect. Therefore, the application of new methods of surface hardening has become topical. These methods include ion-plasma chromium plating. On the basis of experimental studies, the effect of ion-plasma chromium plating on the wear resistance and mechanical properties of hydraulic hammer parts has been established, structural changes in the material have been analyzed. Ion-plasma chromizing of the parts pro-motes the increase of their wear resistance in 1.75 times as compared to those which are not strengthened. The technology of ion-plasma chromizing secures the running of the strengthened parts without breaking off and chipping. The zones of structural changes are marked on the sec-tions of parts damages, which are typical for the effects of the second hardening.