Collection of scientific works of the Ukrainian State University of Railway Transport最新文献

{"title":"THE EFFICIENCY SELF-STRESSED CONCRETE AS THE CORE FOR SQUARE CROSS-SECTION STEEL-CONCRETE COLUMNS","authors":"Євгеній Galagurya, M. Kovalov, L. Kravtsiv, D. Petrenko, Ihor Bychenok","doi":"10.18664/1994-7852.184.2019.175885","DOIUrl":"https://doi.org/10.18664/1994-7852.184.2019.175885","url":null,"abstract":"","PeriodicalId":183715,"journal":{"name":"Collection of scientific works of the Ukrainian State University of Railway Transport","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127023148","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":"REDUCTION OF HUMIDITY IN TUNNELS OF KIEV METROPOLITEN, BY CHANGING THE OPERATION MODES OF VENTILATION INSTALLATIONS","authors":"А. Deineko, P. Krukovskyi, D. I. Skliarenko, Мihаylо Мikоlаyоvich Fedotov, Ольга Юліївна Тадля","doi":"10.18664/1994-7852.183.2019.169636","DOIUrl":"https://doi.org/10.18664/1994-7852.183.2019.169636","url":null,"abstract":"У статті проаналізовано експериментальні значення відносної вологості тунельного повітря службових з’єднувальних гілок КП «Київський метрополітен» при роботі тунельної вентиляції відповідно до діючих графіків. Для дотримання нормованого значення вологості тунельного повітря запропоновано зміну режимів роботи вентиляційних установок упродовж літнього періоду: з видалення на нагнітання. Експериментально підтверджено зниження вологості тунельного повітря при ввімкненні рекомендованого режиму роботи вентиляційних установок.","PeriodicalId":183715,"journal":{"name":"Collection of scientific works of the Ukrainian State University of Railway Transport","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114242222","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 METHOD OF COMBINED BEAMS","authors":"T. Azizov, O. Myza","doi":"10.18664/1994-7852.183.2019.169792","DOIUrl":"https://doi.org/10.18664/1994-7852.183.2019.169792","url":null,"abstract":"was proposed to perform the calculation with taking into account nonlinear properties of material similarly to the reinforced concrete beams calculation with layer-by-layer division of section by height but taking into account the presence of two layers along the section width. In this case, an iterative approach is used with a sequential increase in the magnitude of strains in the marginal compressed fiber of the combined section. Bernoulli hypothesis is used, i.e. it is considered that the strains along the section height are distributed according to a linear law, and the stresses in each layer considered along the section height are determined according to the material diagram. At the same time, the stresses in the reinforced concrete plates and in the stone part are different at the same height in the cross section due to the difference in diagrams of these materials. For the calculation simplification the material diagram is accepted in the form of Prandtl diagram. It is shown that, due to the presence of two different materials in the cross section, there can be four possible cases for the height of a compressed zone determining. It depends on the ratio of the value of deformations in the marginal fiber specified at iterations to the maximum deformations of the layers (stone part and reinforced concrete plates). The height of compressed zone in each case is determined from the quadratic equation solution. It is shown that the iterative calculation converges very quickly. At the same time, the accuracy of calculations by the approximate method is sufficient for carrying out practical calculations. An algorithm for the iterative calculation of the combined beam is given.","PeriodicalId":183715,"journal":{"name":"Collection of scientific works of the Ukrainian State University of Railway Transport","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114959123","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":"ADVANTAGES OF THE USE OF CHEMICAL ANCHORS ARE ON ACRYLIC COMPOSITIONS FOR FASTENING OF TECHNOLOGICAL EQUIPMENT","authors":"N. Zolotova, V. Sklyarov, O. Suprun, D. Vikhrov","doi":"10.18664/1994-7852.183.2019.169785","DOIUrl":"https://doi.org/10.18664/1994-7852.183.2019.169785","url":null,"abstract":"events. Cost of acrylic polymer in 2÷5 times below than other widespread. Development and introduction of progressive methods of works on setting of anchors for fastening of equipment are important reserve of reduction of labour intensiveness, resource-demanding, duration and cost of both construction-works and works from the reconstruction of industrial enterprises and the special actuality in this connection today demonstrate chemical anchors. siloxane,","PeriodicalId":183715,"journal":{"name":"Collection of scientific works of the Ukrainian State University of Railway Transport","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117043786","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":"INCREASE ACCURACY ACCOUNTING AND CONTROL OF DIESEL FUEL CONSUMPTION","authors":"M. Kotov, Volodumur Drobaha","doi":"10.18664/1994-7852.183.2019.169648","DOIUrl":"https://doi.org/10.18664/1994-7852.183.2019.169648","url":null,"abstract":"","PeriodicalId":183715,"journal":{"name":"Collection of scientific works of the Ukrainian State University of Railway Transport","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133670407","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":"INFLUENCE OF MINERAL ADDITIVES ON SULFATE STABILITY OF PORTLAND CEMENT","authors":"V. Gots, O. Kovalchuk, Yaroslav Oleksandrovych Hovdun","doi":"10.18664/1994-7852.183.2019.169660","DOIUrl":"https://doi.org/10.18664/1994-7852.183.2019.169660","url":null,"abstract":"times comparing to the control composition. Use of fly ash is less effective from the cement grade point of view, but it provides 1.5 times better sulfate resistance comparing to Portland cement. Fly ash behavior separates on two directs – as a filler and as an aggregate. In general – as higher fly ash content, as higher sulfate resistance. The efficiency of increasing the sulfate resistance of cements with the use of active mineral additives of different types is considered. It was found that the maximum effect of increase of sulfate stability is observed with the use of combination of granular slag and fly ash in the composition of Portland cement systems, which is accompanied by an increase in sulfate stability of 2 times compared with the control composition. Portland cement systems with active mineral additives have been obtained, their sulfate stability is not inferior to traditional sulfate-resistant slag-portland cement. According to the test results it is shown possibility to obtain high sulfate corrosive resistance materials on Portland cement basis using blast furnace slag and fly ash admixtures. Service properties are meeting requirements of Ukrainian standards for common constructions.","PeriodicalId":183715,"journal":{"name":"Collection of scientific works of the Ukrainian State University of Railway Transport","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127188826","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":"DEFINITION OF THE DUAL WEAR FEATURES OF THE BRAKE SHOES OF FREIGHT CARS","authors":"V. Ravlyuk","doi":"10.18664/1994-7852.183.2019.169643","DOIUrl":"https://doi.org/10.18664/1994-7852.183.2019.169643","url":null,"abstract":"","PeriodicalId":183715,"journal":{"name":"Collection of scientific works of the Ukrainian State University of Railway Transport","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126858959","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":"RESEARCH OF ASYNCHRONOUS ELECTRIC DRIVE, OPTIMIZED ACCORDING TO THE CRITERION OF MAXIMIZING TORQUE-PER-AMP","authors":"D. Tugay, O. Shkurpela","doi":"10.18664/1994-7852.183.2019.169655","DOIUrl":"https://doi.org/10.18664/1994-7852.183.2019.169655","url":null,"abstract":"Досліджено роботу асинхронного електропривода на базі автономного інвертора напруги з векторною системою керування та двигуна АД-906У в режимах його повного та часткового використання за потужністю на математичній моделі у програмному середовищі MATLAB. Показано, що характеристика |ψR|=f(Pdc) має суттєвий вплив на характер протікання перехідного процесу асинхронного електропривода при роботі з потужністю нижчою за номінальну. Такі режими є характерними для тягового привода автономного електричного транспорту. Для підвищення ефективності тягового асинхронного електропривода автономного електротранспорту пропонується проведення оптимізації його системи управління за критерієм максимізації співвідношення момент – струм з урахуванням характеристики |ψR|=f(Pdc). Подано кількісну оцінку відхилення коефіцієнта потужності двигуна при зміні величини споживаної потужності. Ключові слова: асинхронний електропривод, математичне моделювання, оптимізація, МТРА, автономний рухомий склад.","PeriodicalId":183715,"journal":{"name":"Collection of scientific works of the Ukrainian State University of Railway Transport","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129493767","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":"STOCHASTIC CALCULATION OF THE CRITICAL FACTOR COEFFICIENT FOR CENTRALLY CMPRESSED ELEMENTS","authors":"N. Makhinko","doi":"10.18664/1994-7852.183.2019.169758","DOIUrl":"https://doi.org/10.18664/1994-7852.183.2019.169758","url":null,"abstract":"This paper deals with the problem of determining a generalized critical factor. It is the ratio of the generalized efforts to the strength. These values are random. Besides, the study is about the stochastic calculation of the steel constructions’ central-compressed elements. There is a complexity in using stochastic methods of calculation, because the coefficient of longitudinal bending is the function of the element’s flexibility, the yield strength and the type of stability curve. For obtaining the final solution it is necessary to perform complex multi-stage mathematical operations. Therefore, the function’s approximation of the coefficient of longitudinal bending was made by using exponential dependence. Exponential dependence was used for this purpose. The stability curves’ parameters, which depend on the type of the transverse section, were calculated. A graphical comparison of the normative expression for the coefficient of longitudinal bending with the proposed dependence was made. The convergence of the results is sufficient in the values’ range of elements flexibility from 0-100. The differences increase with values of flexibility greater than 100. However, the coefficient values of the longitudinal bending of more than 0.3 are seldom achieved. The expressions are obtained for determining the random value of the critical factor of the central-compressed element in a simple analytical form. It has been numerically proved that the values of an exponent in the formula of a critical factor could be equated to one. It simplifies the calculation greatly. The distribution density of the critical factor’s random value of the central compressed element at the two coordinate planes, the classical and critical probability scale, is presented graphically. Distribution histograms were made for two variants on the basis of numerical simulation using the formulas of the State Construction Standards [1] and, respectively, statistical processing of the simulation results according to the obtained dependencies. The data analysis showed clear correspondence of the element’s critical factor to the reference curve in the area of probability values.","PeriodicalId":183715,"journal":{"name":"Collection of scientific works of the Ukrainian State University of Railway Transport","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129513680","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":"INFLUENCE OF DEGGLATION ON EFFECTIVENESS OF WORK MARINE PORTS OF UKRAINE","authors":"S. Zinchenko","doi":"10.18664/1994-7852.183.2019.169455","DOIUrl":"https://doi.org/10.18664/1994-7852.183.2019.169455","url":null,"abstract":"У статті проаналізовано існуючі підходи до стратегічного розвитку конкурентоспроможності морського транспорту України, зокрема інфраструктури морських портів в умовах дерегуляції їх роботи. Визначено, що такі підходи повинні базуватися на підвищенні обумовленої ефективності, що містить у собі економічну, соціальну, екологічну, функціональну й інші види ефективності роботи транспортних систем морських портів з урахуванням пріоритетності енергоі ресурсозбереження, захисту довкілля, а також гармонізації з міжнародними вимогами до якості і результативності роботи інфраструктури портів. Розвиток транспортних систем морських портів призводить до необхідності проведення подальших досліджень взаємозв’язків матеріальних, інформаційних та інших логістичних потоків України, а також окремих її регіонів. Ключові слова: дерегуляція, ефективність, морський порт, конкурентоспроможність.","PeriodicalId":183715,"journal":{"name":"Collection of scientific works of the Ukrainian State University of Railway Transport","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130605974","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}