7 research outputs found

    Ensuring the specified position of multisupport rotating units when dressing mineral resources

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    Purpose. The solution of the problem for determining a specified vertical displacement of supports in a rotating unit, taking into account the yielding in the crosscut of the supporting node, as well as the peculiarities of the structural design. Methods. When performing the work, the approaches based on the elasticity theory principles are used, taking into account the variable transverse crosscut of the unit and the different high-altitude positions of supports. To determine the general expressions describing the axis position of the studied multisupport structure, the Cauchy’ function method was used. Findings. A system of solvable algebraic equations has been obtained that enables to perform calculations for a beam-type cylindrical structure on rigid and elastic supports. The expressions are presented for determining the value of vertical displacement of the supports, taking into account the operational characteristics of a unit, in particular the presence of the influence of neighboring supports and the value of existing loads. The cases have been studied of implementing the adjusting displacements, using the obtained equation system with the complete unloading of the supporting nodes, as well as with the use of the technical diagnostics data – the determined values of the total displacements of the supports. Expressions have been obtained for calculating the desired adjustment parameters. An algorithm is proposed for performing the computing operations. Originality. The method of adjustment of the specified position of supports in a rotating unit has been further developed, which is carried out through determining the elastic components, rigid displacements, complete displacement in the supporting node, as well as the results of technical diagnostics. Practical implications. The calculations have been made taking into account the yielding of the supports in the range of maximum and minimum values. It is shown that the value of certain supports displacement, which should be taken into account as a result of their yielding, can reach the extremum standard values. The presence of previous displacements of the supports predetermines a significant acting forces redistribution in the rotating furnace body and is determined by their direction. The value of adjusting displacements has been determined, which should be performed to obtain a rectilinear axis of rotation. It has been revealed that it is appropriate to implement a parallel displacement of the projected axis of rotation for reducing the adjustment parameters in the supporting nodes.Мета. Розв’язання задачі про встановлення заданого вертикального переміщення опор обертового агрегату із врахуванням податливості в перерізі опорного вузла та особливостей конструктивного виконання. Методика. При виконанні роботи застосовуються підходи, що ґрунтуються на положеннях теорії пружності із врахуванням змінного поперечного перерізу агрегату та різного висотного положення опор. Для встановлення загальних виразів, які описують положення осі досліджуваної багатоопорної конструкції, застосовувався метод функцій Коші. Результати. Отримано систему розв’язуваних алгебраїчних рівнянь, яка дає змогу виконувати обчислення для балкової циліндричної конструкції на жорстких та пружних опорах. Представлено вирази для встановлення величини вертикального зміщення опор із врахуванням експлуатаційних характеристик агрегату, зокрема наявності впливу сусідніх опор та величини діючих навантажень. Розглянуто випадки реалізації регулювальних переміщень із застосуванням отриманої системи рівнянь при повному розвантаженні опорних вузлів, а також при використанні даних технічного діагностування – встановлених значень сумарних переміщень опор. Отримано вирази для обчислення шуканих регулювань. Запропоновано алгоритм виконання обчислювальних операцій. Наукова новизна. Отримав подальший розвиток метод регулювання заданого положення опор обертового агрегату, що здійснюється із встановленням пружних складових, жорстких зміщень, повного переміщення в опорному вузлі та результатів технічного діагностування. Практична значимість. Проведено обчислення із врахуванням податливості опор у діапазоні максимальних та мінімальних значень. Показано, що величина зміщення окремих опор, яку необхідно враховувати внаслідок їх податливості, може сягати граничних нормативних значень. Наявність попередніх зміщень опор зумовлює значний перерозподіл діючих зусиль в корпусі обертової печі та визначається їх напрямом. Встановлено величину регулювальних переміщень, які необхідно виконати для отримання прямолінійної осі обертання. Показано, що доцільно реалізовувати паралельне зміщення проектованої осі обертання для зменшення регулювань в опорних вузлах.Цель. Решение задачи об установлении заданного вертикального перемещения опор вращающегося агрегата с учетом податливости в сечении опорного узла и особенностей конструктивного исполнения. Методика. При выполнении работы применяются подходы, основанные на положениях теории упругости с учетом переменного поперечного сечения агрегата и различного высотного положения опор. Для установления общих выражений, описывающих положение оси исследуемой многоопорной конструкции, применялся метод функций Коши. Результаты. Получена система решаемых уравнений, которая позволяет выполнять вычисления для балочной цилиндрической конструкции на жестких и упругих опорах. Представлены выражения для установления величины вертикального смещения опор с учетом эксплуатационных характеристик агрегата, в частности наличии влияния соседних опор и величины действующих нагрузок. Рассмотрены случаи реализации регулировочных перемещений с применением полученной системы уравнений при полной разгрузке опорных узлов, а также при использовании данных технического диагностирования – установленных значений суммарных перемещений опор. Получены выражения для вычисления искомых регулировок. Предложен алгоритм выполнения вычислительных операций. Научная новизна. Получил дальнейшее развитие метод регулирования заданного положения опор вращающегося агрегата, который осуществляется с установлением упругих составляющих, жестких смещений, полного перемещения в опорном узле и результатов технического диагностирования. Практическая значимость. Проведены вычисления с учетом податливости опор в диапазоне максимальных и минимальных значений. Показано, что величина смещения отдельных опор, которую необходимо учитывать в результате их податливости, может достигать предельных нормативных значений. Наличие предыдущих смещений опор обуславливает значительное перераспределение действующих усилий в корпусе вращающейся печи и определяется их направлением. Установлено величину регулировочных перемещений, которые необходимо выполнить для получения прямолинейной оси вращения. Показано, что целесообразно реализовать параллельное смещение проектируемой оси вращения для уменьшения регулировок в опорных узлах.The results presented in the article have been obtained without the support of research projects and special financing. However, the work was conducted within the framework of joint research of scientists of the Lviv Polytechnic National University and Dnipro University of Technology. The authors express their gratitude to these Higher Educational Institutions for their support and assistance in conducting the study

    Development of the Quantitative Method for Automated Text Content Authorship Attribution Based on the Statistical Analysis of N-grams Distribution

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    The peculiarities of the application of linguo-statistics technologies for the identification of the style of the author of text content of scientific and technical profile are considered. Quantitative linguistic analysis of a text uses the benefits of content monitoring based on the NLP methods to identify and analyze the set of stop words, keywords, set phrases and to study N-gram. The latter are used in the linguometry methods to determine in per cent if the given text belongs to a particular author. The quantitative method for automatic text content authorship attribution was developed based on statistical analysis of the 3-gram distribution. The approach to the implementation of identification of the author of the text in the Ukrainian language of the scientific and technical profile was proposed. Experimental results of the proposed method to determine the belonging of the analyzed text to a specific author in the presence of the reference text were obtained. Application of the linguo-statistical analysis of the 3-grams to a set of articles will make it possible to form a subset of publications that are similar in linguistic descriptions. Imposing additional conditions in the form of statistical and quantitative analyses (a set of keywords, set expressions, stylometric, linguometric analyses, etc.) on a subset will allow a significant reduction of this subset by specifying the list of the most likely author. For qualitative and effective content analysis when determining the degree of authorship of a particular author, we propose to analyze the reference text and the one under consideration at several stages: linguometric analysis of the coefficients of the diversity of the author's speech, stylometric analysis, analysis of set expressions, linguo-statistical analysis of 3-grams. For automated text processing, not only the frequency of occurrence of a certain category, but also its existence in the studied text in general are important. Quantitative computation makes it possible to draw objective conclusions about the orientation of materials by the number of using the units of analysis in the studied texts. Qualitative analysis does the same, but as a result of the study of whether (and in what context) there is a certain important original category in genera

    Design of a Recommendation System Based on Collaborative Filtering and Machine Learning Considering Personal Needs of the User

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    The paper reports a study into recommendation algorithms and determination of their advantages and disadvantages. The method for developing recommendations based on collaborative filtering such as Content-Based Filtering (CBF), Collaborative Filtering (CF), and hybrid methods of Machine Learning (ML) has been improved. The paper describes the design principles and functional requirements to a recommendation system in the form of a Web application for choosing the content required by user using movies as an example. The research has focused on solving issues related to cold start and scalability within the method of collaborative filtering. To effectively address these tasks, we have used hybrid training methods. A hybrid recommendation system (HRS) has been practically implemented for providing relevant content recommendations using movies as an example, taking into consideration the user's personal preferences based on the constructed hybrid method. We have improved an algorithm for developing content recommendations based on the collaborative filtering and Machine Learning for the combined filtration of similarity indicators among users or goods. The hybrid algorithm receives initial information in a different form, normalizes it, and generates relevant recommendations based on a combination of CF and CBF methods. Machine Learning is capable of defining those factors that influence the selection of relevant films, which improves development of recommendations specific to the user. To solve these tasks, a new improved method has been proposed, underlying which, in contrast to existing systems of recommendations, are the hybrid methods and Machine Learning. Machine Learning data for the designed HRS were borrowed from MovieLens. We have analyzed methods for developing recommendations to the user; existing recommendation systems have been reviewed. Our experimental results demonstrate that the operational indicators for the proposed HRS, based on the technology of CF+CBF+ML, outperform those for two individual models, CF and CBF, and such their combinations as CF CBF, CF+ML, and CBF+ML. We recommend using HRS to collect data on people's preferences in selecting goods and to providing relevant recommendations

    Design of the Architecture of an Intelligent System for Distributing Commercial Content in the Internet Space Based on SEO-technologies, Neural Networks, and Machine Learning

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    We have considered a task on designing an intelligent system of commercial distribution of informational products using a personalized approach to visitors based on the categories and tags of content that interests visitors. A general standard architecture of appropriate system has been developed using methods and personalization tools in the Internet environment with a core of automated recommendation of tags (categories) in the form of a neural network with controlled training. A personalized approach to the web site user results in a higher rate of sales. The system that was developed on the basis of modern SEO technologies considering the metrics for assessing the operation of an information and search module in the system makes it possible to select relevant content according to the user's personalized interests. The system has classes and subclasses that include real commercial informational products, interrelated by the built logical links, whose application promotes the intelligent supply of content based on the personalization of needs and interests of the user. In addition, based on modern methods of Machine Learning, the designed system learns to refine the results from searching the content in demand according to the personalized user's preferences. Personalization algorithms make it possible to associate each user with a list of products that are most likely to be of interest, and can predict what customers may want to see even if they are not aware of it yet. The aim of the intelligent system of e-commerce is to represent unique content based on the personalization approach and the use of tags. In addition to a standard text introduction of categories and tags based on images and product descriptions, the designed automation process defines tags and product categories. Recognition of context using deep neural networks now provides a technology for automated addition of tags to the description of goods at e-commerce web sites. The methods can be used to categorize facial expressions and recognize emotion
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