Scientific journal of the Ternopil national technical university最新文献

{"title":"Theory of frames use to reduce the information loss in signals transmitting","authors":"Oleksandr Matsiuk","doi":"10.33108/visnyk_tntu2022.01.019","DOIUrl":"https://doi.org/10.33108/visnyk_tntu2022.01.019","url":null,"abstract":"The development of «smart city» conception must involve some new mathematical methods which allow us to reduce any information loss in data transfer in the smart city resource networks. Some possible use of advanced methods of the theory of frames for these problems has been taken into consideration in the article under discussion.","PeriodicalId":21595,"journal":{"name":"Scientific journal of the Ternopil national technical university","volume":"36 3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83380472","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 method of nanotubes causing on polytetrafluoroethylene films surface","authors":"Vitalii Mocharskyi, Oksana Sitkar, B. Kovalyuk","doi":"10.33108/visnyk_tntu2022.04.117","DOIUrl":"https://doi.org/10.33108/visnyk_tntu2022.04.117","url":null,"abstract":"A new method of nanotubes causing on the surface of polytetrafluoroethylene (PTFE) films using a device for laser shock-plasma acceleration of finely dispersed materials was developed in this work,. The formed structures were investigated using scanning electron microscopy. The transmission spectra of the formed films were studied. Physical mechanisms during coating application and changes in transmission spectra are explained.","PeriodicalId":21595,"journal":{"name":"Scientific journal of the Ternopil national technical university","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83994408","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":"Automated ai-based proctoring for online testing in e-learning system","authors":"Oleh Shkodzinsky, Mykhailo Lutskiv","doi":"10.33108/visnyk_tntu2022.03.076","DOIUrl":"https://doi.org/10.33108/visnyk_tntu2022.03.076","url":null,"abstract":"Based on the analysis of existing on the market algorithmic solutions for identity verification during knowledge control in electronic learning systems, the requirements for the target system were formed. The main algorithms and approaches to the detection and recognition of faces were considered, as a result of which an effective combination of algorithms was chosen. The system of photo fixation and identity verification during knowledge control in LMS ATutor was designed and implemented. Its effectiveness was verified on the basis of a sample of test passes during its work in the real conditions of the educational process. Conclusions were made regarding the feasibility of implementation.","PeriodicalId":21595,"journal":{"name":"Scientific journal of the Ternopil national technical university","volume":"203 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77722976","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":"Heat exchange in a chamber apparatus with a circulation circuit during cheese masses production","authors":"Mariia Shynkaryk, Viktor Voroshchuk, O. Kravets, Olha Krupa, Natalia Zvarych","doi":"10.33108/visnyk_tntu2022.04.043","DOIUrl":"https://doi.org/10.33108/visnyk_tntu2022.04.043","url":null,"abstract":"Chamber heat exchangers are used in various branches of the food industry. Different types of stirrers are used in them as the means of intensifying heat transfer. They also give the devices the function of mixing devices. Grinding mechanisms are installed in some designs, which also affect the heat transfer and hydrodynamics of the movement. Grinding and mixing devices are especially widely used in the production of composite products. During heat treatment, uniformity of heating of the whole mass and the same duration of action of the maximum temperature is important for many products. In such cases, it is advisable to use chamber heat exchangers with a circulating circuit for processing thermolabile products. The heat exchange in such a device is complex due to the hydrodynamics of the product. Studies of the heat exchange process in a capacitive device with a circulating circuit are relevant. In particular, the establishment of the criterion equation of heat transfer to determine the heat transfer coefficient from the wall of the device to the product. The article deals with the peculiarities of heat exchange when using chamber heat exchangers with a stirrer and a circulating circuit. The results of research on the heat exchange process at the production of composite products on the basis of cottage cheese are presented. The process of heating the mass is influenced by its movement through the circulating device and in a closed circuit. Therefore, to study the effect of purely mechanical treatment on the heating process of the product, we studied the change in the temperature of the mass at the outlet of the circulation circuit without the supply of a heating agent. According to the results of the research, it was found that the circulation of the product in a closed circuit allows ensuring uniform heating and reduces the duration of the process. And for portions of the product weighing up to 5 kg, the required temperature can be achieved even only through machining. The criterion equation of heat transfer to determine the heat transfer coefficient from the wall to the product was obtained by the method of dimensions. A circulation number is entered, which is the ratio of the volume of the circulating product to the volume mixed by the stirrer.","PeriodicalId":21595,"journal":{"name":"Scientific journal of the Ternopil national technical university","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89746098","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":"Algorithms for automatic of metrological characteristics of transducers","authors":"Serhiy Babiuk, Ivan Sysak, O. Buniak, Yaroslav Osadtsa","doi":"10.33108/visnyk_tntu2022.03.067","DOIUrl":"https://doi.org/10.33108/visnyk_tntu2022.03.067","url":null,"abstract":"The algorithms for automatic correction of metrological characteristics of high-voltage instrument transformers in the absence of benchmark measurement signals at the source input are proposed. The investigated algorithm can be applied for automatic correction of metrological characteristics of measuring channels in the case of multiplicative distortions caused by the nonlinear dependence of the transmission coefficient on the input value.","PeriodicalId":21595,"journal":{"name":"Scientific journal of the Ternopil national technical university","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86402403","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":"Methodology for refining the performance of screw conveyor","authors":"M. Pankiv, M.Ya. Pylypets, V. Pankiv, Yulia Pankiv, N. Dubchak","doi":"10.33108/visnyk_tntu2022.01.095","DOIUrl":"https://doi.org/10.33108/visnyk_tntu2022.01.095","url":null,"abstract":"Improving the existing designs of screw conveyors can significantly increase productivity and expand the functionality of transport mechanisms, which leads to further development of production. One of the reserves to increase the functionality of screw transport mechanisms is to improve the transportation process by developing combined screw working bodies that will ensure the simultaneous movement and grinding of materials. The objestive of the work is to refine the mathematical model of productivity of the improved screw conveyor basing on coordination of supply of root crops from the loading channel to the auger and complex geometrical factor of filling the working space of a trench. The developed refined mathematical model allows to determine at the highest level the real productivity of simultaneous transportation and grinding of root crops on a separate technological unit, which is installed, for example, in the line of preparation and processing of root crops for biofuels. This allows to optimize the parameters and modes of operation of the entire processing complex at a practical level and ensure its estimated productivity of the manufacturing process.","PeriodicalId":21595,"journal":{"name":"Scientific journal of the Ternopil national technical university","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82346587","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":"Method of calibration mems accelerometer and magnetometer for increasing the accuracy determination angular orientation of satellite antenna reflector","authors":"M. Palamar, Taras Horyn, A. Palamar, Vitaliy Batuk","doi":"10.33108/visnyk_tntu2022.04.079","DOIUrl":"https://doi.org/10.33108/visnyk_tntu2022.04.079","url":null,"abstract":"The paper is devoted to the measurement errors investigation that arise due to the influence of MEMS accelerometers' nonlinear characteristics. They appear at large inclination angles of the antenna system support-rotary platform, as well as in the presence of a magnetic inclination, which is due to the peculiarity of the Earth's magnetic field for the magnetometer. The study was conducted to assess the possibility of using such devices to increase the accuracy of a satellite antenna control with a classic rotary platform. The experimental setup for researching the parameters of MEMS sensors allows comparison of measurement results with data obtained from precision optical encoder. The experimental results show the main sources of MEMS sensors errors. An accuracy increasing method of antenna system angular position determining using a triaxial accelerometer and a magnetometer is proposed. The main advantage of the proposed estimation vector determining approach using the least squares method is the possibility of carrying out the calibration procedure without reference to the coordinate system. The method makes it possible to get rid of the zero offset error, as well as compensate for the non-unit scale of the sensor axes and the error of the magnetometer angular orientation. This method can be used for many applications including robotics, design of unmanned aerial vehicles and many other technical systems. The proposed method makes it possible to increase the reliability and reduce the cost of such systems.","PeriodicalId":21595,"journal":{"name":"Scientific journal of the Ternopil national technical university","volume":"85 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83576551","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":"Utilization of OLP method in the analysis of a robotic 3d scanning process","authors":"Łukasz Sobaszek, M. Woźniak, Daniel Szczypiór","doi":"10.33108/visnyk_tntu2022.02.047","DOIUrl":"https://doi.org/10.33108/visnyk_tntu2022.02.047","url":null,"abstract":"In the paper the assessment of the feasibility of using a selected off-line robot programming environment in the design process of a robotic 3D scanning process was presented. First of all, basic information about modern industrial robots implementations were outlined. Secondly, a developed virtual model of an analyzed robotic cell was described. Moreover, analyses on selected aspects of the considered issue were discussed. The study has confirmed that utilization of OLP method is very useful and needed for improvement of robotic production processes.","PeriodicalId":21595,"journal":{"name":"Scientific journal of the Ternopil national technical university","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84151888","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 the spatial motion of a body with distributed mass connected by an inextensible cable to a moving trolley","authors":"Serhii Podliesnyi","doi":"10.33108/visnyk_tntu2022.02.083","DOIUrl":"https://doi.org/10.33108/visnyk_tntu2022.02.083","url":null,"abstract":"The article considers the spatial motion of a mechanical system where a heavy beam of a given mass and dimensions is suspended at one end by a weightless inextensible cable to a trolley, which can move along horizontal guides without resistance. The system has five degrees of freedom. Based on the apparatus of analytical mechanics and Lagrange equations, a mathematical model of the considered mechanical system in the form of a system of five nonlinear differential equations of the second order is obtained. The mathematical model is implemented in the form of a computer program that allows you to determine the coordinates (positions) of the beam at any time, build the trajectory of the center of mass, determine the kinematic characteristics of the movement, calculate the cable tension and determine its extreme value. Based on the numerical experiment, graphs and phase trajectories of these parameters are constructed, including the 3D trajectory of the center of mass of the beam. The system can show quite complex dynamics depending on the initial conditions, as evidenced by the results of numerical calculations. Under certain conditions, chaotic behavior of the system is possible. Having a mathematical model and a calculation program, it is possible to conduct further studies of the system under consideration, revealing the positions of stable and unstable equilibrium, modes of self-oscillations, revealing areas of periodic and chaotic modes, bifurcations, and so on.","PeriodicalId":21595,"journal":{"name":"Scientific journal of the Ternopil national technical university","volume":"110 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74834665","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":"Computer modeling of cardiac rhythm based on vector of stationary random sequences","authors":"Petro Onyskiv, S. Lupenko, I. Lytvynenko, Anatolii Lupenko, Oleksandr Volianyk, Olena Tsitsiura, 𝑙, 𝑚 𝜔′𝑡, 𝑚 𝜔′, 𝑙 ∈ 𝑍","doi":"10.33108/visnyk_tntu2022.04.131","DOIUrl":"https://doi.org/10.33108/visnyk_tntu2022.04.131","url":null,"abstract":"The article is devoted to a computer modeling method of electrocardiogram rhythm based on a mathematically justified model in the form of a vector of stationary random sequences. The developed computer modeling method allows for generating realizations of vector electrocardiogram rhythm signal (vector components of stationary random sequences) for different types of electrocardiogram signals, both normal and with various types of rhythm pathologies. The modeling of electrocardiogram rhythms was carried out based on the obtained statistical information in the form of estimates of the mathematical expectation and variance of the components of the vector of stationary random sequences. It has been shown that the obtained estimates of statistical characteristics of the modeled vector components (components that describe the electrocardiogram rhythm) are within confidence intervals, which is an indication of the correctness of the experiments conducted using the developed computer simulation method. The accuracy of the computer simulation method for generating realizations of the vector components of stationary random sequences has been investigated, and the error of the computer simulation does not exceed 13% for the investigated vector components.","PeriodicalId":21595,"journal":{"name":"Scientific journal of the Ternopil national technical university","volume":"103 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79409835","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}