Bulletin of the National Technical University «KhPI». Series: New solutions in modern technology最新文献

{"title":"Calculation of the electric field distribution in the vicinity of the conductive rod","authors":"S. Lytvynenko","doi":"10.20998/2413-4295.2020.01.12","DOIUrl":"https://doi.org/10.20998/2413-4295.2020.01.12","url":null,"abstract":"The article reviews the methods of mathematical modeling of electric fields in the vicinity of conducting rods and presents a method developed for calculating the distribution of the electric field strength and potential in systems with conducting rods. This method allows to use a computational spatial grid with a step proportional not to the radius of the rod, but to its length, which is relevant when the ratio of the rods length to its radius is large. The method is applied to the calculation of rods EF, for which this ratio is of the order of 10–10. The proposed method is based on the finite integration method. At the same time, the nonlinear decrease in the levels of strength and potential when moving away from the rod in directions perpendicular to its axis is taken into account. The difference coefficients at the nodes surrounding the rod were obtained by integrating over the computational grid cell surfaces of expressions describing the strength and potential of the electric field for an elongated conducting ellipsoid under potential. With this representation of the conducting rod, it was possible to achieve the greatest accordance of calculations with the analytical solution. In practice, the application of the presented method allows for a more accurate calculation of the electric field in the vicinity of a conducting rod, which is either under potential, or in a homogeneous electric field, using a computational grid with a step proportional not to the radius of the rod, but to its length. The non-linear character of the decrease in the strength and potential of the electric field near the rod is taken into account using analytical expressions for a conductive ellipsoid under potential. In the area surrounding the rod and above its top, when using a spatial grid step proportionate with the length of the rod, and not with its radius, the relative errors in calculating the strength decreased from 27 % to 3 %. The results of calculating the electric field of a lightning rod are presented in order to analyze the conditions for the occurrence of upward leaders.","PeriodicalId":258143,"journal":{"name":"Bulletin of the National Technical University «KhPI». Series: New solutions in modern technology","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122277972","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":"Innovative technologies for monitoring the technical condition of boxing units of cars by the built-in control system","authors":"I. Martynov, V. Petukhov, A. Trufanova, A. Babenko, V. Shovkun","doi":"10.20998/2413-4295.2020.01.03","DOIUrl":"https://doi.org/10.20998/2413-4295.2020.01.03","url":null,"abstract":"The paper considers an integrated system for monitoring the technical condition of axle boxes for new car generation. The general structure of the system, which consists of onboard and ground modules, is considered. The OBD onboard module is mounted on the end face of the wheelset axle and, thus, the temperature sensor has direct contact with the axle journal. BDS ground modules can be both stationary, which are located directly on the stretch, and mobile - in the form of hand-held terminals. The results of full-scale and operational tests in the framework of scientific research work on the cars of the Poltava mining and processing plant for Ukrainian Railways are presented. Operational tests have shown that the system increases the reliability of control, and on the basis of the data obtained, it is possible to analyze the technical condition of the axle boxes. It has also been confirmed that the system is capable of operating reliably under operating conditions. Analyzing the test results, three technologies for the use of embedded systems were proposed: the technology of use at control posts, both separately and in conjunction with existing remote control systems; data collection technology during the parking of cars in maintenance; combined technology combining the first two into one: operational minimum necessary data is collected at control points, and volumetric data for analysis - when the car is parked. It is concluded that embedded systems, in combination with remote ones, increase the reliability and efficiency of control. As well as the integration of embedded systems into the existing infrastructure of remote systems, it will significantly reduce the cost of control, as well as the time of deployment and adaptation of the system. The proposed three methods for monitoring the technical condition of axle boxes in operation, ultimately, will allow not only with high reliability to identify overheated axle boxes in passing trains, but also prevent the installation of cars with potentially emergency axle boxes by analyzing dynamic data obtained from built-in control tools. This one , in turn, will increase the safety of transportation and their rhythm. безопасность их","PeriodicalId":258143,"journal":{"name":"Bulletin of the National Technical University «KhPI». Series: New solutions in modern technology","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114460499","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 effect of sprouted legume flour on the quality of fermented milk product during storage","authors":"Y. Biletska","doi":"10.20998/2413-4295.2020.01.05","DOIUrl":"https://doi.org/10.20998/2413-4295.2020.01.05","url":null,"abstract":"The article presents the results of a study of the effect of germinated legume flour enriched with iodine and selenium on the quality of fermented milk product during storage. The relevance of the research is due to the lack of fermented milk products for people suffering from endocrine disorders, the market void of which reaches about 23 % of total production. As a result of research it is inserted that appearance and a consistence of the sour-milk product made according to a new compounding is jelly-like with equal edges, a uniform clot, milk-beige color. The product has a pure sour milk smell and a pleasant sour milk taste. The complex organoleptic index of the developed product is 0,1 point higher compared to the control. It was found that the mass fraction of fat in the test sample decreases by 1.7%, and the mass fraction of protein by 0,28% increases compared to the control. The use of germinated legume flour affects the change in titratable acidity and fermentation time. The acidity increases by 0,5 ° T, and the fermentation time decreases by 1 hour. According to the studied quality indicators, which are regulated by the normative and technical documentation, the product, where germinated bean flour was used, meets the established norms. Regularities of change of indicators of quality of sour-milk product with use of flour of the germinated bean during storage are defined. It was found that there is a change in acidity, which increases with increasing storage time. Against the background of increasing acidity, there is an increase in the number of lactic acid bacteria. The recommended terms of consumption which make 9 days are established. At this time of consumption, the developed products will have the usual organoleptic characteristics, acidity – 95 ° T. The content of lactic acid bacteria, bifidobacteria and acidophilic bacteria –≤ 10×10. The developed fermented milk product is a carrier of organic iodine and selenium in the amount of 25,2 (n ± 0,2) and 14 (n ± 0,3) μg. Which provides 16,8 and 24,5% coverage of the daily requirement of iodine and selenium for adults and adults and 28 and 46,6 % (respectively) for school-age children.","PeriodicalId":258143,"journal":{"name":"Bulletin of the National Technical University «KhPI». Series: New solutions in modern technology","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117186870","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}