Journal of Siberian Federal University: Engineering & Technologies最新文献

{"title":"Strength of Curvilinearly Reinforced Plates in a Polar Coordinate System","authors":"Y. Nemirovsky","doi":"10.17516/1999-494x-0365","DOIUrl":"https://doi.org/10.17516/1999-494x-0365","url":null,"abstract":"А computer simulation of flat structures to create a fiber composite with curved reinforcement along spiral trajectories in the polar coordinate system has been performed. Numerical comparisons of the reachability of limit states for various reinforcement structures by two families of continuous curved fibers have been made. The calculations take into account the influence of a constant temperature field. In this paper, analytical solutions of the reinforcement intensity function of the differential equation of the constancy of the fiber cross sections for the families of logarithmic and algebraic spirals are found. The analysis of the results shows that due to the choice of curved laying of reinforcing fibers, it is possible to obtain a structure with predetermined properties","PeriodicalId":17206,"journal":{"name":"Journal of Siberian Federal University: Engineering & Technologies","volume":"55 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88496720","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 Influence of Manufacturing Technology on the Properties of Chromium-Bronze Electrodes for Contact Relief Welding of Reinforcing Rods","authors":"Sergei L. Busygin","doi":"10.17516/1999-494x-0368","DOIUrl":"https://doi.org/10.17516/1999-494x-0368","url":null,"abstract":"The article discusses an effective, in comparison with common, technology of manufacturing chromium bronze electrodes for resistance projection welding of reinforcing bars. Within the framework of this technology, a method for preparing a melt with alloying with a multicomponent element, including basic elements, a matrix of copper powder and a filler of nanostructured chromium particles, is considered. The technology is based on a combined molding-plastic deformation process and makes it possible to obtain a finished resistance welding electrode of type D in one operation. The results of microstructural, X‑ray micro-spectral and local energy dispersive (micro) analysis of electrode samples obtained by different technologies, explaining the main nature of the loss of electrode performance, are presented. The results of fractographic studies of the contact surface of the electrodes are considered. Electrical conductivity and mechanical properties were studied for all electrode samples. The results of tests on a resistance welding machine with an assessment of the wear of the electrodes and the reasons for their failure are presented","PeriodicalId":17206,"journal":{"name":"Journal of Siberian Federal University: Engineering & Technologies","volume":"228 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75394445","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":"Issues of Development of Solar Collectors with High Efficiency","authors":"M. Uzbekov","doi":"10.17516/1999-494x-0364","DOIUrl":"https://doi.org/10.17516/1999-494x-0364","url":null,"abstract":"The article deals with the creation of energy-efficient solar water collectors. In order to develop energy-efficient solar water collectors (SWC), methods of rational enhancement of heat transfer in the channels of the collectors are proposed. It is noted that the methods used to increase heat transfer from the collector walls to the water should be tailored to a low-speed flow of the heat carrier. With such flow regimes, the most acceptable ways to enhance heat transfer are: flow swirling, the use of artificial roughness, renewal of the hydrodynamic boundary layer through the creation of an alternating pressure gradient in the flow. The analysis of the conducted research shows that the maximum effects of increasing heat transfer occur in the range of Re numbers from 2000 to 8000, i. e. in the laminar flow region and in the region of underdeveloped turbulence. An efficiency criterion is obtained for the conditions under which enhancers are installed inside the pipes. The criterion determines the ratio of the number of pipes with enhancers to the number of smooth pipes. The calculation is carried out for cases in which the heating capacity, flow rate, power for heat carrier circulation and the pipe diameter of the SWC with smooth pipes are equal to the heating capacity, flow rate, power for heat carrier circulation and pipe diameter of the SWC with the pipes with enhancers. In addition to the specified efficiency criterion of the SWC, a heat transfer comparison formula of the SWC having pipes with enhancers and SWC with smooth pipes is obtained","PeriodicalId":17206,"journal":{"name":"Journal of Siberian Federal University: Engineering & Technologies","volume":"71 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83862576","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":"Integral Indicator of the Efficiency Assessment and Energy Saving Potential in the Municipal Public Sector","authors":"Eugenia Yu. Sizganova","doi":"10.17516/1999-494x-0360","DOIUrl":"https://doi.org/10.17516/1999-494x-0360","url":null,"abstract":"The paper presents a method to assess the efficiency and the potential of energy saving in the municipal public sector on the example of the network of Krasnoyarsk municipal educational institutions. It is performed according to criteria expressions based on the law of optimal formation of technocenosis by comparing two integral indicators, one of them characterizes a positive effect, and another one expresses costs","PeriodicalId":17206,"journal":{"name":"Journal of Siberian Federal University: Engineering & Technologies","volume":"97 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86167104","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":"Electrolytic Processing of Pb-Bi Alloy","authors":"A. A. Korolev","doi":"10.17516/1999-494x-0362","DOIUrl":"https://doi.org/10.17516/1999-494x-0362","url":null,"abstract":"Metal bismuth is mainly produced as a by-product in the production of lead, tungsten, copper, silver, gold, tin and zinc. Approximately 90 % of all extracted bismuth is obtained from lead, copper and other concentrates. The main source of bismuth is lead concentrates obtained during the processing of lead, as well as lead-zinc and other polymetallic ores. During the processing of these concentrates, bismuth almost completely enters the rough lead, from which it is removed during its refining. The most common technologies for the recovery of bismuth from lead ingots are the Kroll-Betterton process and the Betts electrolytic process. During the electrolysis of the Bi-Pb alloy, the separation of three products has been established, they are anode and cathode alloys, as well as salt melt. The complexity of pyroelectrometallurgical processing of a bismuth-poor alloy with the production of rough bismuth in one stage is confirmed, which necessitates the use of two stages of electrolysis. At the first stage of electrolysis, the anode product‑1 (17.3–48.5 % of the initial Pb-Bi alloy) of the composition has been isolated,%: 16.6–48.4 Bi; 51.4–83.2 Pb; operational extraction,%: 92.2–96.6 Bi; 9.8–44.4 Pb; main phases Bi0,3Pb0,7 and Bi0,95Pb0,05. A six-fold bismuth enrichment is achieved in the anode product. At the second stage of electrolysis of the previously isolated anode product of the composition,%: 26.7 Bi; 73.1 Pb; 0.13 Cu; 0.08 Zn, the anode product‑2 (28.1 % of the enriched Pb-Bi alloy) of the composition has been separated,%: 93.6 Bi; 4.1 Pb; 0.086 Ag; 0.0066 As; 0.006 Sb; 0.0013 Cu; 0.001 Sn; 0.0014 Zn; stage extraction,%: 98.6 Bi; 1.6 Pb; main phase Bi0,95Pb0,05. As a result of pyroelectrometallurgical processing of a Pb-Bi alloy (~10 % Bi) with anode polarization in two stages, an anode product (8.7 % of the initial alloy) of the composition has been isolated,%: ≥ 93.6 Bi; 4.1 Pb; extraction from the initial alloy,%: 93.0 Bi; 0.4 Pb has been obtained. The following modes are recommended for pyroelectrometallurgical processing in two stages of Pb-Bi alloy: process temperature 550–600 °C; anode current density: 0.5 A/cm2 at the first stage; 0.2–0.3 A/cm2 at the second stage; cathode current density: 1.5 A/cm2 at the first stage; 1.0 A/cm2 at the second stage; operating voltage on the tub: at the first stage 8–12 V; at the second stage 5–8 V; the composition of the electrolyte at both stages,%: 7 NaCl; 35 KCl; 18 PbCl2; 40 ZnCl2; the amount of electrolyte output for processing: at the first stage – 10 % of the mass of the Pb-Bi alloy after alkaline treatment; at the second stage – 10 % of the mass of the anode product of the first stage","PeriodicalId":17206,"journal":{"name":"Journal of Siberian Federal University: Engineering & Technologies","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78253471","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":"Machine Learning Approach to Simulation of Continuous Seeded Crystallization of Gibbsite","authors":"V. Golubev","doi":"10.17516/1999-494x-0366","DOIUrl":"https://doi.org/10.17516/1999-494x-0366","url":null,"abstract":"Continuous seeded crystallization is characterized by oscillations of particle size distribution (PSD) and liquor productivity. To describe these oscillations using analytical methods is a complicated task due to non-linearity and slow response of the process. This paper uses a statistical approach to the preparation of initial data, determination of the significant factors and arrangement of the said factors by their impact on the dynamics of crystal population development. Various methods of machine learning were analyzed to develop a model capable of forecasting the time series of particle size distribution and composition of the final solution. The paper proposes to use deep learning methods for predicting the distribution of crystals by grades and liquor productivity. Such approach has never been used for these purposes before. The study shows that models based on long short-term memory (LSTM) cells provide for better accuracy with less trainable parameters as compared with other multilayer neural networks. Training of the models and the assessment of their quality are performed using the historical data collected in the hydrate crystallization area at the operating alumina refinery","PeriodicalId":17206,"journal":{"name":"Journal of Siberian Federal University: Engineering & Technologies","volume":"41 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74690164","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":"Statistical Multimode Accounting in the Problem of Optimal Reactive Load Compensation when Constructing Smart Grids","authors":"A. Gerasimenko","doi":"10.17516/1999-494x-0359","DOIUrl":"https://doi.org/10.17516/1999-494x-0359","url":null,"abstract":"The article deals with the development prospects for smart grids. An approach to optimizing the modes of electric power systems in terms of reactive power is presented in detail. The solution of this problem considers the multimodality, determination of the integral characteristics of the modes, etc. Analytical modeling of load changes by means of the method of factor analysis allows to reduce the amount of information drastically without a significant loss of the accuracy of the obtained solutions. For this purpose, the actually correlated electrical loads of various nodes of electric power systems are represented in the form of a linear combination of independent random variables, namely, generalized load graphs. It is shown that the inclusion of multimode by orthogonal graphs results in a significant simplification of the solution of multimode problems. The choice of the dependent and independent variables composition when solving the optimization problem with the power consumption modes has a fundamental effect both on the modeling of constraints, the formation of the reduced gradient and the main calculation expressions, and on the speed of the optimization search as a whole","PeriodicalId":17206,"journal":{"name":"Journal of Siberian Federal University: Engineering & Technologies","volume":"2010 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89512397","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":"Development of an Algorithm for Defining Thyristors Opening Angle Value at the New Configuration of Grid Commutation of Reversible Converter Arms of Electric Locomotive","authors":"Oleg V. Chikirkin","doi":"10.17516/1999-494x-0361","DOIUrl":"https://doi.org/10.17516/1999-494x-0361","url":null,"abstract":"The article presents a new approach in the application of a diode discharge arm which is aimed at increasing the energy indicators of traction mode of AC locomotives. The method implies the utilization of electromagnetic energy stored in the commutate current circuit for closing exhausted thyristor arms of traction converters through a buffer contour provided by the discharge arm. A mathematical simulation of electromagnetic processes of the standard and proposed converters has been performed. The analysis of the results allows to find the most optimal value of thyristor arms opening angle when the discharge arm closes fully the exhausted thyristor arms in compliance with the condition of increasing the power factor of the electric locomotive. The developed control method of the proposed converter is presented by a table of pulses fed to the thyristors electrodes, as well as by the algorithm of point-of-time calculation of the impulses generation","PeriodicalId":17206,"journal":{"name":"Journal of Siberian Federal University: Engineering & Technologies","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74770964","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":"Model of the Method of Autonomous Navigation of Unmanned Aerial Vehicles Based on Infrared Images of the Terrain","authors":"I. Ischuk, M. Likhachev","doi":"10.17516/1999-494x-0346","DOIUrl":"https://doi.org/10.17516/1999-494x-0346","url":null,"abstract":"The article presents a descriptive model of autonomous navigation of unmanned aerial vehicles based on infrared images. The method and algorithm for implementing the autonomous navigation model are considered. Numerical estimates of the efficiency of autonomous navigation based on multispectral multi-time photographic survey of the Earth's surface are obtained","PeriodicalId":17206,"journal":{"name":"Journal of Siberian Federal University: Engineering & Technologies","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79166408","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 Improve the Effectiveness of Defeating Group Air Targets in Anti-Aircraft Combat","authors":"Alexander A. Antsiferov","doi":"10.17516/1999-494x-0355","DOIUrl":"https://doi.org/10.17516/1999-494x-0355","url":null,"abstract":"This article discusses ways to improve the efficiency of anti-aircraft guided missiles to intercept group air targets. An effective way to defeat the elements of group air targets using anti-aircraft guided missiles is the joint guidance of several missiles at several air targets from the group. The basic technical requirements for anti-aircraft guided missiles for the implementation of this principle are defined","PeriodicalId":17206,"journal":{"name":"Journal of Siberian Federal University: Engineering & Technologies","volume":"78 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91479114","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}