Труды сотрудников ИВМ СО РАН

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Найдено документов в текущей БД: 30

    Analysis of rotational motion of material microstructure particles by equations of the Cosserat elasticity theory
[Text] / O.V. Sadovskaya, V.M. Sadovskii // Acoust. Phys. - 2010. - Vol. 56, Is. 6. - P942-950, DOI 10.1134/S1063771010060199. - Cited References: 19. - This study was supported by the Russian Foundation for Basic Research (project no. 08-01-00148), Complex Fundamental Research Program no. 2 of the Presidium of the Russian Academy of Sciences, and Siberian Division of the Russian Academy of Sciences (Interdisciplinary Integration Project no. 40). . - 9. - ISSN 1063-7710
РУБ Acoustics
Рубрики:
WAVES
   PROPAGATION

Аннотация: Oscillatory processes in media with microstructure under the action of concentrated impulse and time-periodic perturbations are analyzed within the Cosserat elasticity theory. According to the results of computations, such media are characterized by a resonance frequency equal to the frequency of natural oscillations of particle rotational motion. This frequency is a phenomenological parameter of a material. It was established that the oscillatory rotation of particles changes for monotone rotational motion with increasing intensity of shear strains.


Доп.точки доступа:
Sadovskaya, O.V.; Садовская, Оксана Викторовна; Sadovskii, V.M.; Садовский, Владимир Михайлович

    On the acoustic approximation of thermomechanical model of a liquid crystal
/ V. M. Sadovskii // Proceedings of XLI International Summer School–Conference APM 2013. - 2013. - P493-500

Аннотация: Based on the equations of dynamics of a structurally inhomogeneous elastic medium taking into account the rotational degrees of freedom of the particles of microstructure, a simplified mathematical model is worked out for description of the wave motion in nematic liquid crystals under the influence of weak mechanical and thermal perturbations. It is shown that in the case of plane strain the shear stress in such a medium satisfies the Klein–Gordon equation, describing the oscillatory nature of particles rotation. The results of numerical computations shows that the natural frequency of rotational motion of the particles, determined by this equation, is the resonance characteristic of a material, and it is independent of the size of a sample and of the loading conditions.

Полный текст

Держатели документа:
ИВМ СО РАН : 660036, Красноярск, Академгородок, 50, стр.44

Доп.точки доступа:
Садовский, Владимир Михайлович

    On the acoustic approximation of thermomechanical description of a liquid crystal
/ V. M. Sadovskii, O. V. Sadovskaya // Physical Mesomechanics. - 2013. - Vol. 16, № 4. - P312-318, DOI 10.1134/S102995991304005X . - ISSN 1029-9599

Кл.слова (ненормированные):
Klein-Gordon equation -- micropolar medium -- rotational waves -- thermoelasticity

Аннотация: Based on dynamic equations of a heterogeneous elastic medium which take into account rotational degrees of freedom of microstructure particles, a simplified mathematical model was constructed to describe the wave motions of a nematic liquid crystal under weak mechanical and temperature perturbations. It is shown that in the medium under plane deformation, the tangential stress obeys the Klein-Gordon equation of oscillatory particle rotation. Consideration is given to the possibility of initiating rotational waves in a nematic liquid crystal, which change its optical properties, due to heat sources acting at its boundary. © 2013 Pleiades Publishing, Ltd.

Scopus,
Полный текст

Держатели документа:
ИВМ СО РАН : 660036, Красноярск, Академгородок, 50, стр.44

Доп.точки доступа:
Sadovskaya, O.V.; Садовская, Оксана Викторовна; Sadovsky V.M.

    Solar System magnetospheres
[Text] / M. Blanc, R. Kallenbach, N. V. Erkaev // Space Sci. Rev. - 2005. - Vol. 116: Workshop on Comparative Study of the Outer Planets before the Exploration of Saturn (JAN 12-14, 2004, Bern, SWITZERLAND), Is. 01.02.2013. - P227-298, DOI 10.1007/s11214-005-1958-y. - Cited References: 202 . - ISSN 0038-6308
РУБ Astronomy & Astrophysics

Аннотация: This article proposes a short review of our present knowledge of solar system magnetospheres, with the purpose of placing the study of Saturn's inagnetosphere in the context of a comparative approach. We describe the diversity of solar system magnetospheres and the underlying causes of this diversity: nature and magnetization state of the planetary obstacle, presence or not of a dense atmosphere, rotation state of the planet, existence of a system of satellites, rings and neutral gas populations in orbit around the planet. We follow the "russian doll" hierarchy of solar system magnetospheres to briefly describe the different objects of this family: the heliosphere, which is the Sun's magnetosphere; the "elementary" magnetospheres of the inner planets, Earth and Mercury; the "complex" magnetospheres of the giant planets, dominated by planetary rotation and the presence of interacting objects within their magnetospheric cavities, some of which, like Ganymede, to or Titan, produce small intrinsic or induced magnetospheres inside the large one. We finally describe the main original features of Saturn's magnetosphere as we see them after the Voyager fly-bys and before the arrival of Cassini at Saturn, and list some of the key questions which Cassini will have to address during its four-year orbital tour.


Доп.точки доступа:
Blanc, M.; Kallenbach, R.; Erkaev, N.V.; Еркаев, Николай Васильевич

    The role of the magnetic barrier in the solar wind-magneto sphere interaction
[Text] / N. V. Erkaev, C. J. Farrugia, H. K. Biernat // Planet Space Sci. - 2003. - Vol. 51, Is. 12. - P745-755, DOI 10.1016/S0032-0633(03)00111-9. - Cited References: 36 . - ISSN 0032-0633
РУБ Astronomy & Astrophysics

Аннотация: The magnetized solar wind carries a large amount of energy but only a small fraction of it enters the magnetosphere and powers its dynamics. Numerous observations show that the interplanetary magnetic field (IMF) is a key parameter regulating the solar wind-magnetosphere interaction. The main factor determining the amount of energy extracted from the solar wind flow by the magnetosphere is the plasma flow structure in the region adjacent to the sunward side of the magnetopause. While compared to the energy of the solar wind flow the IMF magnetic energy is relatively weak, it is considerably enhanced in a thin layer next to the dayside magnetopause variously called the plasma depletion layer or magnetic barrier. Important features of this barrier/layer are (i) a pile-up of the magnetic field with (ii) a concurrent decrease of density, (iii) enhancement of proton temperature anisotropy, (iv) asymmetry of plasma flow caused by magnetic field tension. and (v) characteristic wave emissions (ion cyclotron waves). Importantly, the magnetic barrier can be considered as an energy source for magnetic reconnection. While the steady-state magnetic barrier has been extensively examined, non-steady processes therein have only been addressed by a few authors. We discuss here two non-steady aspects related to variations of the magnetic barrier caused by (i) a north-to-south rotation of the IMF, and (ii) by pulses of magnetic field reconnection at the magnetopause. When the IMF rotates smoothly from north-to-south, a transition layer is shown to appear in the magnetosheath which evolves into a thin layer bounded by sharp gradients in the magnetic field and plasma quantities. For a given reconnection rate and calculated parameters of the magnetic barrier, we estimate the duration and length scale of a reconnection pulse as a function of the solar wind parameters. Considering a sudden decrease of the magnetic field near the magnetopause caused by the reconnection pulse, we study the relaxation process of the magnetic barrier. We find that the relaxation time is longer than the duration of the reconnection pulse for large Alfved-Mach numbers. (C) 2003 Elsevier Ltd. All rights reserved.


Доп.точки доступа:
Erkaev, N.V.; Еркаев, Николай Васильевич; Farrugia, C.J.; Biernat, H.K.

    Numerical modelling of solar wind flow about nonaxisymmetric magnetospheres: Planets Jupiter and Saturn
[Text] / C. J. Farrugia, H. K. Biernat, N. V. Erkaev // PLANETARY IONOSPHERES AND MAGNETOSPHERES. Ser. ADVANCES IN SPACE RESEARCH-SERIES : PERGAMON PRESS LTD, 1997. - Vol. 20: C3.2 Symposium of COSPAR Scientific Commission C on Planetary Ionospheres and Magnetospheres, at the 31st COSPAR Scientific Assembly (JUL 14-21, 1996, BIRMINGHAM, ENGLAND), Is. 2. - P209-213, DOI 10.1016/S0273-1177(97)00535-8. - Cited References: 15 . - ISBN 0273-1177. - ISBN 0-08-043297-2
РУБ Engineering, Aerospace + Astronomy & Astrophysics + Geosciences, Multidisciplinary + Meteorology & Atmospheric Sciences

Аннотация: We discuss results on the solar wind flow past the non-axisymmetric magnetospheres of planets Jupiter and Saturn obtained by integrating numerically the dissipationless MHD equations under simplifying assumptions. We model these equatorially broadened magnetospheres as paraboloids with two different radii of curvature at the subsolar point. The thickness of the magnetosheath and the width and structure of the plasma depletion layer are found to be strong functions of the orientation of the interplanetary magnetic field (IMF). The effect of the IMF on the magnetosheath is strongest (weakest) when the IMF is directed perpendicular (parallel) to the rotational equator. For any intermediate IMF orientation, a smooth rotation of the magnetosheath magnetic field towards the direction of the planet's rotational axis is superimposed on the field strength enhancement (and the density reduction) as the respective magnetopauses are approached. These effects are more pronounced at Jupiter than at Saturn. (C) 1997 COSPAR. Published by Elsevier Science Ltd.


Доп.точки доступа:
Farrugia, C.J.; Biernat, H.K.; Erkaev, N.V.; Еркаев, Николай Васильевич

    How to distinguish between kink and sausage modes in flapping oscillations?
[Text] / D. I. Kubyshkina [et al.] // J. Geophys. Res-Space Phys. - 2014. - Vol. 119, Is. 4. - P. 3002-3015, DOI 10.1002/2013JA019477. - Cited References: 32. - We thank C. W. Carlson and J. P. McFadden for use of THEMIS ESA data; K. H. Glassmeier, U. Auster, and W. Baumjohann for the use of FGM data provided under the lead of the Technical University of Braunschweig and with financial support through the German Ministry for Economy and Technology and the German Center for Aviation and Space (DLR) under contract 50 OC 0302. The work was partly supported by SPbU grant 11.38.84.12, by RFBR grants 12-05-00152-a and 12-05-00918-a, and by the grant for support of leading Scientific schools 2836.2014.5. The work of S. Dubyagin and N. Ganushkina was partly supported by the Academy of Finland. This work was supported by the Austrian Science Fund (FWF): I193-N16. N. V. E acknowledges the support by the International Space Science Institute (ISSI, Switzerland) and discussions within the ISSI Team 214 on Flow-Driven Instabilities of the Sun-Earth System. The research has received funding also from the European Union Seventh Framework Programme [FP7/2007-2013] under grant agreement 269198-Geoplasmas (Marie Curie International Research Staff Exchange Scheme) and 218816 (SOTERIA project). . - ISSN 2169-9380. - ISSN 2169-9402
РУБ Astronomy & Astrophysics

Аннотация: Flapping waves are most noticeable large-scale perturbations of the magnetotail current sheet, whose nature is still under discussion. They represent rather slow (an order of magnitude less than typical Alfven speed) waves propagating from the center of the sheet to its flanks with a typical speed of 20-60 km/s, amplitude of 1-2 R-e and quasiperiod of 2-10 min. The double-gradient MHD model, which was elaborated in Erkaev et al. (2007) predicts two (kink and sausage) modes of the flapping waves with differences in their geometry and propagation velocity, but the mode structure is hard to resolve observationally. We investigate the possibility of mode identification by observing the rotation of magnetic field and plasma velocity vectors from a single spacecraft. We test theoretical results by analyzing the flapping oscillations observed by Time History of Events and Macroscale Interactions during Substorms spacecraft and confirm that character of observed rotation is consistent with kink mode determination made by using multispacecraft methods. Also, we checked how the existence of some obstructive conditions, such as noise, combined modes, and multiple sources of the flapping oscillations, can affect on the possibility of the modes separation with suggested method.

Полный текст (доступен только в локальной сети)

Держатели документа:
ИВМ СО РАН

Доп.точки доступа:
Kubyshkina, D.I.; Sormakov, D.A.; Sergeev, V.A.; Semenov, V.S.; Erkaev, N.V.; Еркаев, Николай Васильевич; Kubyshkin, I.V.; Ganushkina, N.Y.; Dubyagin, S.V.; German Ministry for Economy and Technology; German Center for Aviation and Space (DLR) [50 OC 0302]; SPbU [11.38.84.12]; RFBR [12-05-00152-a, 12-05-00918-a]; grant for support of leading Scientific schools [2836.2014.5]; Academy of Finland; Austrian Science Fund (FWF) [I193-N16]; International Space Science Institute (ISSI, Switzerland); European Union [269198, 218816]
Physics, Multidisciplinary
D30

    Deep potential wells and rotation of atoms in a light field
/ A. P. Kazantsev, I. V. Krasnov // Phys. Lett. A. - 1988. - Vol. 127, Is. 1. - P33-36, DOI 10.1016/0375-9601(88)90960-7. - Cited References: 15 . - ISSN 0375-9601
РУБ Physics, Multidisciplinary

Аннотация: A force of light pressure of a new type is found. This force allows one to form superdeep potential wells resulting in the localization of atoms or a vortex field of forces causing a rotation of particles. В© 1988.

WOS,
Scopus

Держатели документа:
ACAD SCI USSR,CTR COMP,KRASNOYARSK,USSR
ИВМ СО РАН
L.D. Landau Institute for Theoretical Physics, Moscow, Russian Federation
Computer Center, the Siberian Department, the Academy of Sciences, Krasnoyarsk, Russian Federation

Доп.точки доступа:
KAZANTSEV, A.P.; KRASNOV, I.V.; Краснов, Игорь Васильевич

    Numerical simulation of the dynamics of a liquid crystal in the case of plane strain using GPUs
/ O. V. Sadovskaya // AIP Conference Proceedings. - 2014. - Vol. 1629: 6th International Conference for Promoting the Application of Mathematics in Technical and Natural Sciences, AMiTaNS 2014 (26 June 2014 through 1 July 2014, ) Conference code: 109043. - P303-310, DOI 10.1063/1.4902286 . -
Аннотация: Parallel computational algorithm is worked out for numerical implementation of two-dimensional dynamic model of a liquid crystal, which takes into account the mutual influence of three physical effects - transfer of acoustic energy due to translational motion, viscoelastic rotation of the particles under the action of tangential stresses, anisotropic thermal expansion and compression. The algorithm is based on the Godunov gap decay method, the Ivanov scheme with controlled dissipation of energy and the splitting method with respect to spatial variables. The CUDA technology for computer systems with graphic accelerators is used. Results of computations demonstrating the efficiency of proposed method and algorithm are represented.

Scopus,
Полный текст (доступен только в локальной сети),
WOS

Держатели документа:
Institute of Computational Modeling, SB RAS, Akademgorodok 50/44Krasnoyarsk, Russian Federation

Доп.точки доступа:
Sadovskaya, O.V.; Садовская, Оксана Викторовна

    Equations of the dynamics of a liquid crystal under the influence of weak mechanical and thermal perturbations
/ V. M. Sadovskii // AIP Conference Proceedings. - 2014. - Vol. 1629: 6th International Conference for Promoting the Application of Mathematics in Technical and Natural Sciences, AMiTaNS 2014 (26 June 2014 through 1 July 2014, ) Conference code: 109043. - P311-318, DOI 10.1063/1.4902287 . -

Кл.слова (ненормированные):
dynamics -- micropolar medium -- Nematic liquid crystal -- thermal conductivity -- viscoelasticity -- waves of rotational motion

Аннотация: The paper is devoted to the construction of the simplified mathematical model of thermomechanical behavior of a liquid crystal under the influence of weak mechanical and thermal perturbations. This model is based on the nonlinear equations of a micropolar viscoelastic medium with rotating particles. To describe small strains and finite rotations of molecules, the hypothesis of the dependence of potential energy on the volume change, on the angle of relative rotation and on the entropy is used in the framework of the method of internal thermodynamic parameters. The heat conduction process is described taking into account the anisotropy of a material due to the difference in coefficients of thermal conductivity along the axis of orientation of the particles and in the transverse direction. Separate equation for the tangential stress is obtained from the simplified model, which is useful for the analysis of the recently discussed issues of orientational thermoelasticity and resonant excitation of liquid crystals.

Scopus,
Полный текст (доступен только в локальной сети),
WOS

Держатели документа:
Institute of Computational Modeling, SB RAS, Akademgorodok 50/44Krasnoyarsk, Russian Federation

Доп.точки доступа:
Sadovskii, V.M.; Садовский, Владимир Михайлович

    The evolution of stellar rotation and the hydrogen atmospheres of habitable-zone terrestrial planets
/ C. P. Johnstone [et al.] // Astrophys. J. Lett. - 2015. - Vol. 815, Is. 1, DOI 10.1088/2041-8205/815/1/L12 . - ISSN 2041-8205
Аннотация: Terrestrial planets formed within gaseous protoplanetary disks can accumulate significant hydrogen envelopes. The evolution of such an atmosphere due to XUV driven evaporation depends on the activity evolution of the host star, which itself depends sensitively on its rotational evolution, and therefore on its initial rotation rate. In this Letter, we derive an easily applicable method for calculating planetary atmosphere evaporation that combines models for a hydrostatic lower atmosphere and a hydrodynamic upper atmosphere. We show that the initial rotation rate of the central star is of critical importance for the evolution of planetary atmospheres and can determine if a planet keeps or loses its primordial hydrogen envelope. Our results highlight the need for a detailed treatment of stellar activity evolution when studying the evolution of planetary atmospheres. © 2015. The American Astronomical Society. All rights reserved.

Scopus,
WOS

Держатели документа:
University of Vienna, Department of Astrophysics, Vienna, Austria
Space Research Institute, Austrian Academy of Sciences, Graz, Austria
Institute for Computational Modelling, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Johnstone, C. P.; Gudel, M.; Stokl, A. ; Lammer, H.; Tu, L.; Kislyakova, K. G.; Luftinger, T.; Odert, P.; Erkaev, N.V.; Еркаев, Николай Васильевич; Dorfi, E. A.
Свободных экз. нет
519.63
А 64

    Анализ резонансного возбуждения слоистых и блочных сред на основе дискретных моделей
[Текст] : статья / В. М. Садовский, Е. П. Ченцов // Вычислительные методы и программирование: новые вычислительные технологии. - 2015. - Т. 16, № 2. - С. 318-327 . - ISSN 1726-3522
   Перевод заглавия: Analysis of resonant excitation of layered and block media on the basis of discrete models
УДК

Аннотация: В рамках дискретных моделей исследуются резонансные процессы в структурно неоднородных материалах со слоистой и блочной микроструктурой. Вычислены собственные частоты продольного движения частиц в линейной моноатомной цепочке, имитирующей слоистую среду, с различными типами граничных условий. Для анализа поведения цепочки в окрестности резонансных частот построены спектральные портреты матриц. Показано, что при предельном переходе от модели моноатомной цепочки с упругими связями, учитывающей сопротивление вращению частиц, к модели моментного континуума выделяется характерная резонансная частота вращательного движения, не зависящая от длины цепочки.
Resonant processes in structurally inhomogeneous materials of layered and block microstructure are studied in the framework of discrete models. Natural frequencies of longitudinal motion in a linear monato\-mic chain modeling a layered medium are determined for various boundary conditions. In order to analyze the behavior of the chain near resonant frequencies, the spectral portraits of the corresponding matrices are specified. It is shown that a special resonant frequency of rotational motion is observed when passing to the limit from a model of a monatomic chain with elastic connections to a moment continuum model. The particle rotation resistance is taken into account in this passage to the limit. This special resonant frequency does not depend on the chain length.

РИНЦ

Держатели документа:
Институт вычислительного моделирования СО РАН

Доп.точки доступа:
Ченцов, Евгений Петрович; Sadovskii V.M.

    A Mathematical Model of the Passage of an Asteroid-Comet Body through the Earth's Atmosphere
[Text] / V. Shaydurov, G. Shchepanovskaya, M. Yakubovich ; ed. M. D. Todorov // APPLICATION OF MATHEMATICS IN TECHNICAL AND NATURAL SCIENCES : AMER INST PHYSICS, 2015. - Vol. 1684: 7th International Conference on Application of Mathematics in Technical (JUN 28-JUL 03, 2015, Albena, BULGARIA). - Ст. UNSP 020003. - (AIP Conference Proceedings), DOI 10.1063/1.4934284. - Cited References:23 . -
РУБ Mathematics, Applied + Physics, Applied

Аннотация: In the paper, a mathematical model and a numerical algorithm are proposed for modeling the complex of phenomena which accompany the passage of a friable asteroid-comet body through the Earth's atmosphere: the material ablation, the dissociation of molecules, and the radiation. The proposed model is constructed on the basis of the Navier-Stokes equations for viscous heat-conducting gas with an additional equation for the motion and propagation of a friable lumpy-dust material in air. The energy equation is modified for the relation between two its kinds: the usual energy of the translation of molecules (which defines the temperature and pressure) and the combined energy of their rotation, oscillation, electronic excitation, dissociation, and radiation. For the mathematical model of atmosphere, the distribution of density, pressure, and temperature in height is taken as for the standard atmosphere. An asteroid-comet body is taken initially as a round body consisting of a friable lumpy-dust material with corresponding density and significant viscosity which far exceed those for the atmosphere gas. A numerical algorithm is proposed for solving the initial-boundary problem for the extended system of Navier-Stokes equations. The algorithm is the combination of the semi-Lagrangian approximation for Lagrange transport derivatives and the conforming finite element method for other terms. The implementation of these approaches is illustrated by a numerical example.

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Держатели документа:
SB RAS, Inst Computat Modeling, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Shchepanovskaya, G.I.; Щепановская, Галина Ивановна; Yakubovich, M.V.; Якубович, Максим Викторович; Todorov, M.D. \ed.\; Шайдуров, Владимир Викторович
535.015; 53.082.6
О-62

    Оптимизация рабочих характеристик твердотельного лазера с диодной накачкой для космических применений
[Текст] : статья / Д. А. Архипов [и др.] // Научно-технический вестник информационных технологий, механики и оптики. - 2015. - Т. 15, № 6. - С. 1000-1007 . - ISSN 2226-1494
   Перевод заглавия: Performance optimization of the diode-pumped solid-state laser for space applications
УДК

Аннотация: Предмет исследований. Теоретически и экспериментально исследованы теплофизические и оптические методы стабилизации характеристик твердотельного лазера с диодной накачкой для его применения в системах лазерной космической связи и лазерной дальнометрии. Методы. Исследования проведены с использованием оригинальной конструкции лазерного модуля твердотельного лазера с диодной накачкой, которая включает в себя Nd:YAG активный элемент лазера в виде слэба с оптической накачкой излучением линейки лазерных диодов типа QCW 400W производства фирмы NORTHROP GRUMMAN, неустойчивый двухпроходный резонатор с поворотом апертуры пучка на 180° и выводным зеркалом с переменным коэффициентом отражения, систему термостабилизации режимов генерации линеек лазерных диодов на основе гипертеплопроводящих пластин. Гипертеплопроводящие пластины позволяют исключить традиционные проточные системы охлаждения рабочих элементов твердотельных лазеров. Режим стабилизации температуры обеспечивается с помощью алгоритма широтно-импульсной модуляции мощности дополнительных электрических нагревателей. Для компенсации нестационарных тепловых искажений показателя преломления слэба в схему резонатора лазера включен призменный отражатель с углом при вершине 120°. На его узкие грани нанесено отражающее покрытие, а на широкую - просветляющее. В результате тройного отражения пучка внутри отражателя происходит поворот апертуры пучка на 180°. При осевой симметрии температурных искажений слэба такая процедура приводит к компенсации фазовых искажений выходного лазерного пучка. Для подавления паразитной генерации в слэбе используются диэлектрические оптические покрытия широких граней слэба. Основные результаты. Теоретически и экспериментально показано, что применение гипертеплопроводящих пластин совместно с алгоритмом широтно-импульсной модуляции позволяет обеспечить стабилизацию температуры подложек линеек лазерных диодов с точностью ± 0,1 °С и, одновременно выравнивать распределения температуры по ее поверхности с отклонением менее 1 °С. Оптическая схема резонатора лазера позволяет сохранить угловую расходимость излучения, превышающую дифракционный предел не более чем в два раза, при мощности накачки до 100 Вт. Показано, что для повышения эффективности световой накачки и коэффициента полезного действия лазера в целом необходимо использовать многослойные покрытия широких оптических поверхностей слэба на основе чередующихся слоев SiO2 и ZrO2. Практическая значимость. Предложена оригинальная конструкция лазерного модуля твердотельного лазера с диодной накачкой, позволяющая за счет температурной стабилизации линейки лазерных диодов и компенсации искажений оптического качества активного элемента оптимизировать режимы накачки и генерации излучения твердотельных лазеров. Разработанные методы оптимизации характеристик твердотельного лазера с диодной накачкой применимы и в космических условиях, что становится определяющим фактором при разработке лазеров космического базирования.
Subject of Research. Thermophysical and optical techniques of parameter regulation for diode pumped solid-state laser are studied as applied to space laser communication and laser ranging lines. Methods. The investigations are carried out on the base of the original design of diode pumped solid-state laser module that includes the following: Nd:YAG slab element, diode pumped by 400W QCW produced by NORTHROP GRUMMAN; two-pass unstable resonator with rotation of the laser beam aperture about its axis through 1800; the output mirror of the resonator with a variable reflection coefficient; hyperthermal conductive plates for thermal stabilization of the laser diode generation modes. The presence of thermal conductive plates excludes conventional running water systems applied as cooling systems for solid-state laser components. The diodes temperature stabilization is achieved by applying the algorithm of pulse-width modulation of power of auxiliary electric heaters. To compensate for non-stationary thermal distortions of the slab refractive index, the laser resonator scheme comprises a prism reflector with an apex angle of 1200. Narrow sides of the prism are covered with reflective coating, and its wide side is sprayed with antireflection coating. The beam aperture is turned around its axis through 1800 because of triple reflection of the beam inside the prism. The turning procedure leads to compensating for the output beam phase distortions in view of symmetric character of the aberrations of slab refractive index. To suppress parasitic oscillations inside the slab, dielectric coatings of wide sides of the slab are used. Main Results. We have demonstrated theoretically and experimentally that the usage of hyperthermal conductive plates together with the algorithm of pulse-width modulation provides stabilizing of the diode substrate temperature accurate within ± 0.1 °С and smoothing the temperature distribution along the plate surface accurate within 1 °С. Optical schematic diagram of the laser resonator keeps the laser beam divergence not exceeding a diffraction limit more than twice under a light pump power of 100 W. We have also shown that to increase the lasing efficiency, slab multilayer dielectric coatings made of SiO2 и ZrO2 should be used. Practical Relevance. We have proposed original design of the diode pumped solid-state laser module optimizing the generation and pump modes of solid-state lasers by the temperature stabilization technique for laser diode array and by compensation of the slab aberrations. The techniques are also applicable under space conditions; that is an important factor at developing the space-based lasers.

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Держатели документа:
«Научно-исследовательский институт оптико-электронного приборостроения» (ОАО «НИИ ОЭП»)
ФГБУН Институт вычислительного моделирования Сибирского отделения Российской академии наук

Доп.точки доступа:
Архипов, Д.А.; Arkhipov D.A.; Венглюк, В.И.; Venglyuk V.I.; Деревянко, В.А.; Derevyanko V.A.; Егоров, М.С.; Egorov M.S.; Резунков, Ю.А.; Rezunkov Yu.A.; Степанов, В.В.; Stepanov V.V.

    Обратное вращение Венеры и ее холодное ядро - реальность или ошибка интерпретации геофизических данных?
[Текст] : статья / В. А. Кочнев // Глубинное строение, геодинамика, тепловое поле Земли, интерпретация геофизических полей : материалы конференции. - Екатеринбург : Институт геофизики им. Ю.П. Булашевича УрО РАН, 2015. - С. 203-207
   Перевод заглавия: Reverse rotation of Venus and its cold core - reality or an error of interpretation of geophysical data?
УДК

Аннотация: "Изучая другие планеты, мы приближаемся к новым разгадкам тайн нашей планеты Земля". Из фольклора исследователей.Приведена краткая историческая справка о результатах исследования периода и направления вращения Венеры. Изложены результаты анализа аргументов и признаков ретроградности вращения планеты и сделан вывод об их ошибочности. В пользу нормального вращения планеты приводятся результаты моделирования магнитного поля Венеры, установленная слабая сейсмологическая активность (практическое ее отсутствие) и модель формирования вращения планет в теории О.Ю. Шмидта, В.С. Сафонова и других.
A brief historical background is given concerning the results of investigating the period and direction of Venus rotation. The analysis results of the evidence and features of the retrograde planetary rotation are presented, with the conclusion about the evidence incorrectness being made. Presented in favor of the normal planetary rotation are the results of modeling the magnetic field of Venus, the weak planetary seismic activity (its actual absence) as well as the model of the planetary rotation formation described in the theory by O.Y. Schmidt, V.S. Safronov et al.

РИНЦ,
Источник статьи

Держатели документа:
Институт вычислительного моделирования СО РАН

Доп.точки доступа:
Kochnev V.A.; Российский фонд фундаментальных исследованийИнститут геофизики им Ю.П. Булашевича; Российская академия наук; Уральское отделение РАН; Федеральное агенство научных организаций; Восьмые научные чтения памяти Ю.П. Булашевича "Глубинное строение, геодинамика, тепловое поле Земли, интерпретация геофизических полей" (2015 ; 14.09 - 18.09 ; Екатеринбург)
539.374
А640

    Анализ веерных волн в лабораторной модели, имитирующей распространение сдвиговых трещин в горных породах
[Текст] : статья / Борис Григорьевич Тарасов, Владимир Михайлович Садовский, Оксана Викторовна Садовская // Вычислительная механика сплошных сред. - 2016. - Т. 9, № 1. - С. 38-51, DOI 10.7242/1999-6691/2016.9.1.4 . - ISSN 1999-6691
   Перевод заглавия: Analysis of fan waves in a laboratory model simulating the propagation of shear ruptures in rocks
УДК

Аннотация: Анализируется веерный механизм передачи вращательного движения в системе упруго связанных пластин на плоском основании, имитирующий распространение сдвиговых трещин в горной породе с аномально высокой хрупкостью. Такие трещины возникают в земной коре на глубинах сейсмической активности. Они продвигаются за счет формирования множественных наклонных микротрещин отрыва, приводящих к образованию веерной домино-структуры в головной части трещины. Создана лабораторная физическая модель, которая наглядно демонстрирует процесс распространения веерных волн. Получены уравнения динамики вращательного движения пластин как механической системы с конечным числом степеней свободы. На основе метода Мерсона решения задачи Коши для систем обыкновенных дифференциальных уравнений разработан вычислительный алгоритм, учитывающий контактное взаимодействие пластин. В рамках упрощенной математической модели динамического поведения веерной системы в приближении сплошной среды оценены зависимости длины веера от скорости движения. Показано, что в отсутствие трения веер может двигаться по инерции с любой скоростью, не превосходящей критическое значение, которое определяется размером, моментом инерции и начальным по отношению к плоскому основанию углом пластин, а также коэффициентом упругости связей. При наличии трения веер останавливается. С помощью дискретной и непрерывной моделей исследованы основные качественные закономерности поведения веера, движущегося под действием приложенных касательных усилий, величина которых в лабораторной физической модели регулируется изменением угла наклона основания. Установлено, что результаты расчетов хорошо согласуются с наблюдениями и данными измерений по лабораторной модели.
The fan-shaped mechanism of rotational motion transmission in the system of elastically connected plates on a plane base is analyzed. This mechanism governs the propagation of shear ruptures in super brittle rocks of the Earth’s crust at seismogenic depths. A laboratory physical model was created which demonstrates the process of fan wave propagation. Equations of the dynamics of a fan system as a mechanical system with a finite number of degrees of freedom are obtained. A computational algorithm taking into account contact interaction between plates is worked out. Within the framework of a simplified continuous model, the approximate estimates of the length of a fan depending on the velocity of its propagation are obtained. It is shown that in the absence of friction a stationary fan can move with any velocity that does not exceed the critical value, which depends on the size, the moment of inertia of plates, the initial angle and the coefficient of elasticity of connection, and that the length of a fan decreases with increasing velocity. In the absence of distributed shear stress, when the system of plates is in a horizontal position, the fan stops due to the friction forces. The action of distributed shear stress leads to the incomplete disclosure of a fan, and besides the angle of opening decreases with increasing friction. In a system with friction the velocity of a traveling fan is uniquely determined by the opening angle, and in the case of neglecting friction it can take any value within an allowable range. On the basis of a discrete model, the computations demonstrating the incomplete disclosure of fans with different opening angles due to rapid or slow change in the velocity of rotation of the first plate are performed. Comparison of the results of computations of the length and velocity of the fan by means of a discrete model with computations based on analytical formulas and laboratory observations showed a good correspondence between the results.

РИНЦ

Держатели документа:
University of Western Australia
Институт вычислительного моделирования СО РАН

Доп.точки доступа:
Садовский, Владимир Михайлович; Sadovskii V.M.; Садовская, Оксана Викторовна; Sadovskaya O.V.; Tarasov Boris Grigorievich

    Discrete modeling of oscillatory processes in a blocky medium
/ V. M. Sadovskii, E. P. Chentsov // (15 June 2016 through 22 June 2016 : Springer Verlag, 2017. - Vol. 10187 LNCS. - P583-590, DOI 10.1007/978-3-319-57099-0_66 . -
Аннотация: Resonance phenomena in inhomogeneous layered and blocky media are investigated on the basis of the discrete model of transverserotational oscillations in linear monoatomic chain. To analyze the behavior of the system in near-resonance region, spectral portraits are built. It allows to visualize resonant frequencies and to analyze alteration of an amplitude vector. Using mentioned model, a set of resonant frequencies are found. It is shown that there exists one specific frequency, which does not depend on the number of particles in the chain. In passing to the limit as the chain length tends to infinity, this frequency, related to rotational particles vibration, is the unique resonant frequency. The discussed property is associated with the previously studied property of the Cosserat continuum, where the resonant frequency of rotational motion exists, which does not depend on the specimen size and on the conditions of loading at its boundary. © Springer International Publishing AG 2017.

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Держатели документа:
Institute of Computational Modeling SB RAS, Akademgorodok 50/44, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Chentsov, E.P.; Ченцов, Евгений Петрович; Садовский, Владимир Михайлович

    On the numerical analysis of fan-shaped waves
/ B. G. Tarasov, V. M. Sadovskii, O. V. Sadovskaya // (15 June 2016 through 22 June 2016 : Springer Verlag, 2017. - Vol. 10187 LNCS. - P657-664, DOI 10.1007/978-3-319-57099-0_75 . -
Аннотация: The fan-shaped mechanism of rotational motion transmission in a system of elastically bonded slabs on flat surface is studied. This mechanism governs the propagation of shear ruptures in super brittle rocks at stress conditions of seismogenic depths. The current paper analyzes a built laboratory physical model, which demonstrates the process of fan waves propagation. Equations of the dynamics of the fan-structure as a mechanical system with a finite number of degrees of freedom are obtained. Computational algorithm, taking into account contact interaction of slabs, is worked out. The computations, showing the incomplete disclosure of fans with different opening angles due to fast or slow change in the velocity of rotation of the first slab, are performed. Comparison of the results of computations of length and velocity of a fan by means of a discrete model with laboratory measurements and observations shows good correspondence between the results. © Springer International Publishing AG 2017.

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Держатели документа:
Centre for Offshore Foundation Systems, University of Western Australia, Stirling Highway 35, Perth, WA, Australia
Institute of Computational Modeling SB RAS, Akademgorodok 50/44, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Sadovskii, V.M.; Садовский, Владимир Михайлович; Sadovskaya, O.V.; Садовская, Оксана Викторовна
629.78
Э 15

    Эволюция проекта «Морской старт» космических аппаратов
[Текст] : научное издание / Н. А. Тестоедов [и др.] // Вестник Сибирского государственного аэрокосмического университета им. академика М.Ф. Решетнева. - 2017. - Т. 18, № 1. - С. 160-167 . - ISSN 1816-9724
   Перевод заглавия: The evolution of the project “Sea launch” of spacecraft
УДК

Аннотация: Для выведения космических аппаратов (КА) на геостационарную орбиту желательно производить запуск из зоны, наиболее близкой к экватору, что позволит при запуске ракеты-носителя (РН) максимально использовать скорость вращения Земли. Для решения этой проблемы в 1995 г. в Калифорнии была зарегистрирована компания Sea Launch. Для запусков КА при этом была использована двухступенчатая РН «Зенит». Пусковая установка и технологическое оборудование были смонтированы на доработанной самоходной нефтедобывающей платформе. C 1999 г. до консервации проекта «Морской старт» в 2014 г. с плавучей платформы в экваториальных водах Тихого океана было произведено 36 пусков КА. Однако в 2009 г. Sea Launch столкнулась с финансовыми трудностями, подала заявление о банкротстве и договорилась с РКК «Энергия» о выходе из процедуры банкротства. Появилась информация, что РКК «Энергия» продает космодром российской коммерческой авиакомпании S7 Airlines. Тем не менее, как технические, так и экономические проблемы останутся на прежнем уровне, в связи с чем прорабатывается возможность более экономичного запуска КА с использованием подводных лодок. И такой опыт уже имел место. Так, 7 июля 1998 г. впервые из подводного положения ракетным подводным крейсером Северного флота «Новомосковск» с акватории Баренцева моря с помощью ракеты-носителя «Штиль» были выведены на низкую околоземную орбиту два микроспутника. А 26 мая 2006 г. также из акватории Баренцева моря с АПЛ «Екатеринбург» с помощью РН «Штиль-1Н» был выведен на гелиосинхронную орбиту спутник «Компасс-2». Представленный материал показывает перспективность пуска КА из любой точки Мирового океана на различные орбиты с помощью подводных лодок, что является более надежным и экономичным, чем пуски с применением проекта, использующего тандем из пусковой платформы и сборочно-командного судна. Сопоставление габаритов пусковых шахт подводных лодок, по крайней мере тех, с которых уже производились пуски, и массово-габаритных характеристик КА различного назначения подтверждает такую возможность.
For launching a spacecraft to the geostationary orbit, it is desirable to start from the area closest to the equator that will allow the launch of vehicle to maximize the speed of rotation of the Earth. To resolve this problem in 1995 in California the Sea Launch Company was registered. For launches of satellites a two-stage rocket “Zenit” was used. Launcher and the technological equipment were mounted on a modified self-propelled oil platform. From 1999 to the conservation of the project “Sea launch” in 2014, with a floating platform in the Equatorial waters of the Pacific ocean 36 launches of spacecraft were made. However, in 2009 Sea Launch ran into financial difficulties and filed for bankruptcy, and the company agreed with the RSC “Energia” on the exit from bankruptcy. And it was reported that RSC Energia sold commercial spaceport to the Russian airline, S7 Airlines. However, both technical and economic problems will remain at the same level. Therefore the possibility of more cost-effective launch of the SPACECRAFT using submarines was studied. Such experience has already taken place. On July 7, 1998 for the first time from a submerged position with missile submarine cruiser of the Northern fleet project “Novomoskovsk” with the waters of the Barents sea with the help of the carrier rocket two micro-satellites were launched into low earth orbit. And on May 26, 2006, also from the waters of the Barents sea from the nuclear submarine “Yekaterinburg” using rocket “Shtil-1” the satellite “Compass-2” was launched into heliosynchronous the orbit. The material shows promising start of the spacecraft from any point of the World Ocean at different orbit using submarines, which is more reliable and efficient than launches from the application project that uses the combination of a launch platform and Assembly-command ship. A comparison of the dimensions of the silos of the submarines, at least, those which have already been carried out launches and mass-overall characteristics of the spacecraft for various purposes, confirms this possibility.

РИНЦ

Держатели документа:
АО «Информационные спутниковые системы» имени академика М. Ф. Решетнёва»
Институт вычислительного моделирования СО РАН
Сибирский государственный аэрокосмический университет имени академика М. Ф. Решетнева

Доп.точки доступа:
Тестоедов, Н.А.; Testoedov N.A.; Двирный, В.В.; Dvirnyi V.V.; Крушенко, Г.Г.; Krushenko G.G.; Двирный, Г.В.; Dvirnyi G.V.

    Dynamo models created on the planets under the influence of tidal forces of the satellite and the sun
/ V. A. Kochnev // International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM : International Multidisciplinary Scientific Geoconference, 2017. - Vol. 17: 17th International Multidisciplinary Scientific Geoconference, SGEM 2017 (29 June 2017 through 5 July 2017, ) Conference code: 130800, Is. 62. - P899-906, DOI 10.5593/sgem2017/62/S28.115 . -
Аннотация: It is known that the movement of the liquid core creates electric currents, inducing a main magnetic field of the planet. The liquid core of the high temperature becomes ionized plasma (plasma), which It is quasi-neutral (not neutral) - by definition. One of the major geodynamo questions: what is the source of strength, causing fluid movement in the core of the planet? Many authors have investigated geodynamo: planetary rotation around its axis, the temperature difference and pressure as well as the Coriolis force. Moffatt (1980), at the end of his book, as expressed the problem mentioned above “… For example, it is not yet known that the ultimate source energy is the basic movements of the Earth’s disk Dynamo”. In this study, the role of the driving forces of the liquid core considered tidal forces created axial rotation of the planet and the influence of external objects (the Sun and planets, satellites). The value of the tidal force on the equator of the planet depends on the radius and the period of the axial rotation of the planet, mass, radius and the orbital period of the satellite around the planet. The paper presents the formula and the results of the calculation of tidal forces and forecast the relative values equatorial magnetic fields of the planets all the planets of the solar system. The interpretation of the results illustrated with drawings. The new version of the dynamo It helps to explain the reasons high intensity magnetic Jupiter's field compared to Saturn’s fields, Uranus and Neptune, and much more Earth field intensity compared with fields of Venus, Mercury and Mars. The calculations of the correlation values the magnetic field at the equator: on the model according to the forecast and observations on the planets. Correlation coefficient is 0.997, that indicates a close relationship observed and estimates fields, and this is indirect evidence of the correctness of the adopted model. © SGEM2017 All Rights Reserved.

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Держатели документа:
Institute of Computational Modelling of the Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Kochnev, V. A.