Scientific journal of the Ternopil national technical university最新文献

{"title":"Analysis of the effect of horizontal ties on the deformability of the bottom of the floating pool","authors":"M. Hud, N. Chornomaz, V. Ihnatieva, I. Koval","doi":"10.33108/visnyk_tntu2022.02.133","DOIUrl":"https://doi.org/10.33108/visnyk_tntu2022.02.133","url":null,"abstract":"The paper analyzes the effect of the location of horizontal ties on the deformability of the bottom of the floating pool. The bottom of the pool is a spatial structure, which is made up of trusses connected between the goiter with the help of spacers and ties (elms). The shape and dimensions of the cross-sections for the racks, braces and girders of the trusses have been determined. Two schemes for placement of horizontal ties are proposed. Using the finite element method based on a computer simulation experiment, the influence of the location of horizontal ties on the deformability of the pool bottom was investigated. Numerical values of deflections were calculated for different schemes of arrangement of elms. The optimal layout of connections, which ensures minimal deflections of the bottom, has been identified. The nature and features of the deformation of the bottom of the pool with two schemes for the location of the elms were determined.","PeriodicalId":21595,"journal":{"name":"Scientific journal of the Ternopil national technical university","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78471348","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling of the deformation impact of the main structure framework on the stress and strain state of its individual parts","authors":"M. Kolisnyk, V. Iasnii, Sviatoslav Gomon","doi":"10.33108/visnyk_tntu2022.01.141","DOIUrl":"https://doi.org/10.33108/visnyk_tntu2022.01.141","url":null,"abstract":"The paper presents the calculation of the metal frame of the stairwell under the action of static loads, which was performed using the Dlubal RFEM application software package. The computer modeling technique for the study of metal structures in this software environment was adapted in accordance with building regulations. The general stress calculation in software for the finite element analysis was performed and the selected sections were checked in the RF-STEEL EC3 calculation module for two groups of limit states. Various options for calculating a stairwell made of a metal frame are analyzed. The influence of deformations of the main framework of the structure on the stress-strain state of its individual part was evaluated using software.","PeriodicalId":21595,"journal":{"name":"Scientific journal of the Ternopil national technical university","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83091201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental research of the module for gathering plant of chicory roots","authors":"E. Berezhenko, M. Pankiv, J. Jobbágy, B. Berezhenko","doi":"10.33108/visnyk_tntu2021.01.056","DOIUrl":"https://doi.org/10.33108/visnyk_tntu2021.01.056","url":null,"abstract":"Reduction of energy consumption, which creates hygienic root crops, is achieved with the use of expanded boxes of new technologies and improved pick-up modules, which is an urgent scientific task. Tests of the energy-saving method of growing plants are given and what is more, the scheme of experimental installations (put into operation of the plant harvesting module) and the methods of experimental field factors used in roots have been provided. Analytical and empirical dependencies are obtained, which characterize the change of the second feed and the specific mass of the cut and chopped knife of the rotary saw cutter, depending on the velocity of the module, the yield capacity and the density of chicory root crops plantation. The specific mass of the plant harvested from 3 rows of root crops are, respectively, in the range from 17 to 36 (kg/s) and from 19 to 27 (kg/m2). The results of the experimental studies were processed using Statistics 10, the confidence level P = 0.95, the Fisher F-criterion F = 100.8> Frit and the t-alpha criterion t = 2.05. Based on the graphical constructions it was established that the discrepancy between theoretical and experimental values of the second feed and the specific gravity of the ridge ranges from 10 to 15 (%).","PeriodicalId":21595,"journal":{"name":"Scientific journal of the Ternopil national technical university","volume":"37 5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75662818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of deflections of winded screw flights and auger billets in the processes of their manufacture","authors":"V. Vasylkiv, M.Ya. Pylypets, Larysa Danylchenko, Dmitro Radyk","doi":"10.33108/visnyk_tntu2021.04.033","DOIUrl":"https://doi.org/10.33108/visnyk_tntu2021.04.033","url":null,"abstract":"Analytical dependencies to assess the rigidity of multi-profile screw flights during their manufacture by winding strip blanks with an edge on a mandrel were obtained, which made it possible to determine the profiles of turns with high rigidity and evaluate the accuracy of such blanks. The regularities of deflection of a combined auger billet with open and closed windings in various ways of its fixing in the process of cold winding of strip blanks by a rib onto mandrels have been established.","PeriodicalId":21595,"journal":{"name":"Scientific journal of the Ternopil national technical university","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74962257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanical and mathematical modeling of the load movement on the thread wound on cylindrical drum with movable axis","authors":"Serhii Podliesnyi, M. Dorokhov, Oleksandr Stadnyk, Yurii Yerfort","doi":"10.33108/visnyk_tntu2021.02.054","DOIUrl":"https://doi.org/10.33108/visnyk_tntu2021.02.054","url":null,"abstract":"A mechanical system, where the load in the form of material point is suspended on inextensible thread screwed on the rotating cylindrical drum, but the drum is connected to the boom rotating around fixed horizontal axis is considered. Using the Lagrange equation of the second kind, a mathematical model of the motion of the mechanical system is obtained. The system has three degrees of freedom, two of which are cylindrical. The investigation of the system motion is carried out using computer technology. As a result, the dependences of linear and angular coordinates and velocities in time at different values of the output data for two main modes of the system operation, namely – under the conditions of lifting and lowering the load are obtained. Appropriate graphs are constructed, including the trajectories of the cargo motion. The mathematical model takes into account nonlinearities of the system and allows you to find the amount of tension of the hoisting rope at any time. The analysis showed that vertical oscillations occur twice as fast as horizontal ones. The phase portrait of the generalized coordinate (angle of the rope with the vertical axis) is the focus, which is untwisted when lifting due to nonlinearity in the system, and when the load moves down, the focus, which twists and approaches the mathematical pendulum is obtained. The obtained results can be used in modeling of controlled pendulum motions for different mechanical systems. The methodology and program are recommended to the students and graduate students in terms of learning the principles of construction and analysis of complex nonlinear dynamical systems.","PeriodicalId":21595,"journal":{"name":"Scientific journal of the Ternopil national technical university","volume":"355 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80125829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The process of shells formation by electric arc spraying method and optimization by the criterion of their geometric shape accuracy","authors":"Taras Dubynyak, Roman Dzhydzhora, O. Manziy, S. Andreichuk","doi":"10.33108/visnyk_tntu2021.04.024","DOIUrl":"https://doi.org/10.33108/visnyk_tntu2021.04.024","url":null,"abstract":"The process of shells formation, finding the position of grid elements after deformation is investigated. Minimization of potential energy is carried out numerically by iterative method. The result is the formation of antenna array by electric arc spraying method.This techonology of manufacturing shells from mesh material can be used for the manufacture of axisymmetric and non-axisymmetric reflectors or individual elements of mirror antennas.","PeriodicalId":21595,"journal":{"name":"Scientific journal of the Ternopil national technical university","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79164829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Traffic optimization in wifi networks for the internet of things","authors":"Vyacheslav Starchenko","doi":"10.33108/visnyk_tntu2021.04.131","DOIUrl":"https://doi.org/10.33108/visnyk_tntu2021.04.131","url":null,"abstract":"One of the main problems of modern IoT networks is the large amount of automated traffic generated by their nodes. This puts a significant strain on modern communications networks, which will only increase over time. One way to overcome this problem is to optimize the data structure and improve the methods of data collection, transmission and processing. The purpose of this study is to optimize traffic in the IoT network at the level of software architecture and data representation. The object of the study is the FireBeetle Covers-24 x 8 LED Matrix ESP32, which is controlled by the HOLTEK HT1632C controller, connected via WiFi - interface with the IoT network, implemented on the basis of the ESP8266 microcontroller. The subject of the research is the process of optimizing program code by choosing the most efficient software architecture. The article considers the three most common software architectures and gives examples of their implementation. The architecture based on REST technology was the first to be considered. This technology is the most popular and widespread due to the simplicity of concept and implementation. But its disadvantage is the significant congestion of the communication line with a large amount of the same type of service information. Reducing the amount of service information by optimizing the HTML page code using JavaScript is demonstrated by the example of the second software architecture. But such optimization does not allow to completely separate the static and dynamic components of the information transmitted by the communication line. This division can easily be done within the software architecture based on Ajax & JSON, an example of which is given in the third. The great advantage of this architecture is that the static component is transmitted by the network only once at the beginning of the communication session. Then only the dynamic component is transmitted. According to the results of testing the developed hardware and software module and comparing the amount of generated data transmitted by WiFi network, it is shown that the software architecture based on Ajax & JSON has the highest network efficiency, significantly reducing network traf6fic compared to others.","PeriodicalId":21595,"journal":{"name":"Scientific journal of the Ternopil national technical university","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84430008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Determination of the calorific value of natural gas using predictive modelling","authors":"Halyna Kuz, L. Zamikhovskyi, V. Shulha, M. Kuz","doi":"10.33108/visnyk_tntu2021.03.110","DOIUrl":"https://doi.org/10.33108/visnyk_tntu2021.03.110","url":null,"abstract":"The analysis of the measured data on the calorific value of natural gas in different regions of Ukraine for 2014–2019, which are in the public domain, has been carried out. Since 2020, such data has not been published. This predetermines the need to use calculation methods for determining this physical quantity for subsequent years in different regions of Ukraine. It is proved that during 2018–2019 there was a trend for the stability of calorific value of natural gas, and fluctuations of calorific value had a smaller amplitude (within the range of 9.31–9.80 kW·h/m3), the spread in the values of the calorific value almost halved: from 0.88 to 0.49 kW·h/m3 compared to 2014–2017. Therefore, the measured data for the calorific value of natural gas for the period 2018–2019 were taken as a basis for predictive modeling of this physical quantity. It has been established that for most regions of Ukraine it is possible to use a single average value of the calorific value of natural gas for the subsequent determination of the energy of this energy carrier. The exceptions are Donetsk, Ivano-Frankovsk, Lugansk and Chernivtsi regions, in which the measurement data of the calorific value of natural gas are described with sufficient accuracy by the trigonometric cosine function. By the method of predictive modeling, a mathematical model has been developed to determine the calorific value of natural gas for a specific month of the year in Ukraine. The adequacy of the developed model has been verified by the example of measuring data on the calorific value of natural gas along route 406 (Ivano-Frankivsk region). It was found that the relative error in calculating the combustion heat of natural gas on this route does not exceed plus 1, minus 3%, which is comparable with the accuracy of measuring the volume of natural gas with household gas meters (the volume of gas and its heat of combustion are parameters for determining the energy of natural gas). Thus, a predictive mathematical model has been developed with sufficient accuracy to describe the change in the calorific value of natural gas and can serve as a basis for calculating this gas parameter in the absence of measurement data.","PeriodicalId":21595,"journal":{"name":"Scientific journal of the Ternopil national technical university","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81788106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ways to reduce the influence of high frequency currents on the human body under induction surfacing","authors":"Ch.V. Pulka, Ihor Okipnyi, V. Senchyshyn, O. Levchenko, Sergii Ryskalchik","doi":"10.33108/visnyk_tntu2021.04.015","DOIUrl":"https://doi.org/10.33108/visnyk_tntu2021.04.015","url":null,"abstract":"Devices with thermal and electromagnetic shields for induction heating and surfacing of machine parts using a ferrite magnetic circuit with a single-turn inductor, devices with double-turn and three-turn inductors, in which the surfacing zone is completely closed from the influence on workers are designed. This allows to improve the working conditions, as well as to develop new technological processes using high frequency currents. It is shown that the use of thermal and electromagnetic screens can reduce the surfacing time by 10–20 s and decrease the energy consumption by 15–20%, depending on the powdered hard alloy, taking into account health and safety issues.","PeriodicalId":21595,"journal":{"name":"Scientific journal of the Ternopil national technical university","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87689606","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Calculation of some turbulent wall currents","authors":"V. Mamchuk, L. Romaniuk","doi":"10.33108/visnyk_tntu2021.01.089","DOIUrl":"https://doi.org/10.33108/visnyk_tntu2021.01.089","url":null,"abstract":"A mathematical model for the calculation of turbulent boundary layers and wall stream has been developed. The results of calculations are compared with the results of other authors on the compliance of the calculated values with the experimental data. The currents that are formed under the influence of positive pressure gradients and lead to the phenomenon of separation of the turbulent boundary layer are studied.","PeriodicalId":21595,"journal":{"name":"Scientific journal of the Ternopil national technical university","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88496725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}