Труды сотрудников ИВМ СО РАН

[Текст] : статья / Г. Г. Крушенко, М. А. Воеводина // Технология металлов. - 2015. - № 1. - С. 26-30 . - ISSN 1684-2499
   Перевод заглавия: Influence of modifier type and filtration on cutting of cast iron with nodular graphite

УДК

621.9

Аннотация: Представлены результаты исследования влияния различных видов модификаторов и материала фильтра на обрабатываемость резанием чугуна с шаровидным графитом.
The study results of influence of different modifiers and a filter material on cutting of cast iron with nodular graphite are presented.

РИНЦ

Держатели документа:
Институт вычислительного моделирования СО РАН
Сибирский государственный аэрокосмический университет им. акад. М. Ф. Решетнева
Хакасский технический институт

Доп.точки доступа:
Воеводина, М.А.; Krushenko G.G.

[Текст] : статья / А. Н. Рогалев, С. В. Доронин // Системы. Методы. Технологии. - 2016. - № 2. - С. 91-99, DOI 10.18324/2077-5415-2016-2-91-99 . - ISSN 2077-5415
   Перевод заглавия: Conditioning criteria in numerical computation of the stress state of load-bearing structures

УДК

539.3

519.612

Аннотация: Одним из основных вопросов при конечно-элементном моделировании высокоответственных технических систем является анализ точности полученных результатов. Решение этого вопроса позволяет обосновать надежность характеристик технических объектов. На точность результатов влияют ошибки округления и погрешность приближенных методов линейной алгебры, применяемых в конечно-элементном анализе, а также ошибки, имеющие непосредственное отношение к методу конечных элементов при выборе (построении) сетки конечных элементов, что прямо отражается в свойствах обусловленности матрицы жесткости и величине ошибки решения системы линейных уравнений с матрицей жесткости. Для численных решений, полученных методом конечных элементов, характеристика точности вычислительной ошибки может определяться как величина ошибки решения системы линейных уравнений с матрицей жесткости. Для анализа точности реализован апостериорный анализ ошибок численных вычислений путем двукратного решения системы линейных уравнений с матрицей жесткости, имеющей специально подобранную правую часть. Для полноты анализа результатов конечно-элементного моделирования изучаются числа обусловленности матрицы коэффициентов системы, что позволяет в первом приближении выявлять степень вырожденности матрицы коэффициентов и определять степень чувствительности численных решений к ошибкам. Применение этих процедур позволяет контролировать точность численного решения и анализировать сходимость. Развиваемый подход весьма актуален для конструкций ответственных технических объектов, так как ошибки при проектных расчетах здесь приводят к серьезным последствиям. Оценки вычислительной ошибки численного решения системы линейных алгебраических уравнений с матрицей жесткости применяются в статье для контроля точности в задачах расчета коэффициента концентрации напряжений в круговой пластине с эксцентричным круговым разрезом. Результаты вычислений подтверждают теоретические рассуждения.
One of the main problems in the finite element modeling of highly responsible technical systems is analysis of the accuracy of the results obtained. The solution of this problem allows to prove reliability of technical objects. Rounding errors and errors of approximate methods of linear algebra, used in the finite element analysis, influent the accuracy of the results as well as errors that are directly related to the method of finite elements in the selection (construction) of the finite element grid. This influence is reflected directly in the properties of a stiffness matrix and the size of the error while solving a system of linear equations with the stiffness matrix. For numerical solutions, obtained by finite element method, the characteristics for the accuracy of the computation error can be defined as the value of the error of the solution of linear equations with the stiffness matrix. To analyze the accuracy, a posteriori analysis of numerical computation errors has been realized by solving doubly the systems of linear equations with the stiffness matrix, having specially selected right side. To complete the analysis of the results of the finite element modeling, the condition number of the coefficients matrix of system has been studying which allows to identify the degree of degeneracy of the coefficient matrix at a first approximation and to determine the degree of sensitivity of numerical solutions to the errors. The use of these procedures allows to control the accuracy of the numerical solution and analyze the convergence. The approach proposed is very important for structuring the important technical objects, as errors in the design constructions lead to serious consequences. Estimates of computational error of the numerical solution of a system of linear algebraic equations with the stiffness matrix used in the article for accuracy control in problems of calculation of stress concentration factor in a circular plate with an eccentric circular cutting. The results confirm the theoretical reasoning.

РИНЦ

Держатели документа:
Институт вычислительного моделирования СО РАН
Специальное конструкторско-технологическое бюро «Наука» Института вычислительных технологий СО РАН

Доп.точки доступа:
Доронин, С.В.; Doronin S.V.; Rogalev A.N.

/ A. A. Gosteva, A. K. Matuzko, O. E. Yakubailik // IOP Conference Series: Materials Science and Engineering : Institute of Physics Publishing, 2019. - Vol. 537: International Workshop on Advanced Technologies in Material Science, Mechanical and Automation Engineering - MIP: Engineering-2019 (4 April 2019 through 6 April 2019, ) Conference code: 149243, Is. 6, DOI 10.1088/1757-899X/537/6/062051 . -
Аннотация: Changes in the microclimate of the urban environment often occur as a result of changes in urban development, artificial changes in the relief, and the cutting down of forest plantations. Due to changes in the urban environment there is a change in the microclimate of the city, which entails a direct change in the land surface temperature. Changes in the urban environment can be detected using space images of different spatial resolution in the visible and far infrared range. Landsat data is currently the most accessible, complete, and open for studying these changes. Thermal imaging is widely used for monitoring urban sites. To increase the spatial resolution, synthesis of Landsat-8 images with higher spatial resolution images of Planet Scope is used, which allows increasing the spatial resolution of surface temperature maps produced from Landsat-8 images from 30 meters to 3 meters. The paper presents the results of an assessment of the land surface temperature in the city of Krasnoyarsk for a two-year period from September 2016 to September 2018 based on the analysis of Landsat-8 and Planet Scope satellite images. © 2019 IOP Publishing Ltd. All rights reserved.

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Держатели документа:
Federal Research Center Krasnoyarsk Science Center, SB RAS, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Institute of Computational Modelling, SB RAS, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Gosteva, A. A.; Matuzko, A. K.; Yakubailik, O. E.

/ A. V. Dergunov [et al.] // International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM : International Multidisciplinary Scientific Geoconference, 2019. - Vol. 19: 19th International Multidisciplinary Scientific Geoconference, SGEM 2019 (30 June 2019 through 6 July 2019, ) Conference code: 150486, Is. 2.2. - P517-524, DOI 10.5593/sgem2019/2.2/S10.063 . -
Аннотация: Response to anthropogenic disturbances, recorded according to remote sensing of the Earth, has a long-term manifestation not only in the spectral characteristics of the channels of visible and near infrared ranges of satellite imagery, but also in the study of the temperature field. The paper deals with the local excess temperature of the underlying surface in the areas of cutting the territory of the Angara region, compared with the background values identified by satellite data Landsat 5 and 8 for the seventeen-year period. Estimates of the relative difference in the temperature of the underlying surface of the cutting area in comparison with the average background values are obtained. To this end, a number of software products to automate the archiving and conversion of satellite information has been developed. These software products are designed for calculation of the radio-brightness temperature of the underlying surface of disturbed and undisturbed areas of forest vegetation in the pre-selected areas of the territory. They are also used to average the obtained data of radio-brightness temperature and to calculate the difference between the average values of the radio-brightness temperature of the underlying surface of the disturbed areas relative to the undisturbed, that is, the background. This approach can significantly reduce the processing time of a large amount of information and optimize the amount of data storage. Separately, the study area was analyzed according to the NDVI vegetation index. The data obtained demonstrate a high rate of recovery of grass cover and grass-shrub layer immediately after damage to forest vegetation. It is shown that during the considered period of time (17 years) the value of excess temperature decreases, which is determined by the processes of vegetation restoration, including stand on felling. It is established that the increased temperatures of the underlying surface in the place of cuttings are remained for at least 15 years, and the temperature increase over the background values in the conditions of the observed successional processes is not less than 10%. As a limiting factor in the restoration of the temperature background of the underlying surface, fires can act. © SGEM2019. All Rights Reserved.

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Держатели документа:
Federal Research Center Krasnoyarsk Science Center of the SB RAS, Krasnoyarsk, Russian Federation
Institute of Computational Modelling SB RAS, Krasnoyarsk, Russian Federation
Sukachev Institute of Forest SB RAS, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Dergunov, A. V.; Krasnoshchokov, K. V.; Ponomarev, E. I.; Yakubailik, O. E.

/ A. A. Gosteva, A. K. Matuzko, O. E. Yakubailik // InterCarto, InterGIS : Lomonosov Moscow State University, 2019. - Vol. 25: InterCarto, InterGIS, ) . - С. 90-100, DOI 10.35595/2414-9179-2019-2-25-90-100
   Перевод заглавия: ВЫЯВЛЕНИЕ ИЗМЕНЕНИЙ ГОРОДСКОЙ СРЕДЫ НА ОСНОВЕ СПУТНИКОВЫХ ДАННЫХ ИНФРАКРАСНОГО ДИАПАЗОНА (НА ПРИМЕРЕ КРАСНОЯРСКА)
Аннотация: A big city in the modern world has a strong influence on climate formation; specific micro-climatic conditions are created on certain streets, determined by urban development, street coverage, distribution of green areas. The city, especially with a highly developed industry, pollutes the atmosphere above itself, increases its turbidity and thereby reduces the influx of solar radiation. The decrease in solar radiation is further enhanced by high buildings in narrow streets. Due to the same shroud of smoke and dust in the city, reduced effective radiation, and hence night cooling. At the same time, radiation reflected by walls and pavements joins the scattered radiation in the city. An important feature of the city is the change in the microclimate of the urban environment. Such changes often occur as a result of changes in urban development, artificial relief changes, and the cutting down of forest plantations. Due to changes in the urban environment, there is a change in the microclimate of the city, which entails a direct change in the temperature of the earth’s surface. Changes in the urban environment can be detected using space images of different spatial resolution in the visible and far infrared range. To study these changes, Landsat data is currently the most accessible, complete, and open. The method of visual analysis conducted on visible spectral channels makes it difficult to assess changes, especially in large areas. Thermal imaging is widely used for research and monitoring of man-made objects such as pipelines, urban facilities, industrial facilities and pollution. It is important that thermal images contain information that is almost impossible to obtain in any other way, for example, using images in the visible and near infrared range. In order to improve spatial resolution, Landsat 8 uses the synthesis of this image with images of a higher spatial resolution Planet Scope, which allows increasing the spatial resolution of Landsat 8 surface temperature maps from 30 to 3 meters. Due to the active development of the city, there is a change in the microclimate of the city, which entails a direct change in the temperature of the earth’s surface. The paper presents the results of the assessment of the temperature of the earth’s surface in the city of Krasnoyarsk for a two-year period from September 2016 to September 2018 based on the analysis of Landsat 8 and Planet Scope satellite images. © 2019 Lomonosov Moscow State University.

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Держатели документа:
Siberian Federal University, Kirenskogo St. 26, ULK building., Krasnoyarsk, 660074, Russian Federation
Institute of Computational Modelling of the Siberian Branch of the Russian Academy of Sciences (ICM SB RAS), Akademgorodok 50/44, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Gosteva, A. A.; Matuzko, A. K.; Yakubailik, O. E.