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http://hdl.handle.net/11701/229
2019-01-19T15:30:55Z
2019-01-19T15:30:55Z
Low speed wind tunnels
Ryabinin, Anatoly
http://hdl.handle.net/11701/6216
2017-05-04T00:02:24Z
2017-01-01T00:00:00Z
Название: Low speed wind tunnels
Авторы: Ryabinin, Anatoly
Краткий осмотр (реферат): Design of different types of low speed wind tunnels is considered.; Рассматривается устройство различных типов аэродинамических труб малых скоростей
2017-01-01T00:00:00Z
Introduction to experimental aerodynamics
Ryabinin, Anatoly
Рябинин, А.Н.
http://hdl.handle.net/11701/6210
2017-04-27T00:02:34Z
2015-01-01T00:00:00Z
Название: Introduction to experimental aerodynamics
Авторы: Ryabinin, Anatoly; Рябинин, А.Н.
Краткий осмотр (реферат): Start sections of experimental aerodynamics are presented. The basic of similarity theory is described.; Излагаются начальные разделы экспериментальной аэродинамики. Описаны основы теории подобия.
2015-01-01T00:00:00Z
Transport coefficients and heat fluxes in non-equilibrium high-temperature flows with electronic excitation
Istomin, V.A.
Kustova, E.V.
http://hdl.handle.net/11701/6010
2017-02-17T00:02:38Z
2017-02-07T00:00:00Z
Название: Transport coefficients and heat fluxes in non-equilibrium high-temperature flows with electronic excitation
Авторы: Istomin, V.A.; Kustova, E.V.
Краткий осмотр (реферат): The influence of electronic excitation on transport processes in non-equilibrium high-temperature
ionized mixture flows is studied. Two five-component mixtures, N2/N2+/N/N+/e- and O2/O2+/O/O+/e-, are considered taking into account the electronic degrees of freedom for atomic
species as well as the rotational-vibrational-electronic degrees of freedom for molecular species,
both neutral and ionized. Using the modified Chapman-Enskog method, the transport coefficients
(thermal conductivity, shear viscosity and bulk viscosity, diffusion and thermal diffusion) are calculated
in the temperature range 500–50 000 K. Thermal conductivity and bulk viscosity coefficients
are strongly affected by electronic states, especially for neutral atomic species. Shear
viscosity, diffusion, and thermal diffusion coefficients are not sensible to electronic excitation if
the size of excited states is assumed to be constant. The limits of applicability for the Stokes relation
are discussed; at high temperatures, this relation is violated not only for molecular species but
also for electronically excited atomic gases. Two test cases of strongly non-equilibrium flows
behind plane shock waves corresponding to the spacecraft re-entry (Hermes and Fire II) are simulated
numerically. Fluid-dynamic variables and heat fluxes are evaluated in gases with electronic
excitation. In inviscid flows without chemical-radiative coupling, the flow-field is weakly affected
by electronic states; however, in viscous flows, their influence can be more important, in particular,
on the convective heat flux. The contribution of different dissipative processes to the heat transfer
is evaluated as well as the effect of reaction rate coefficients. The competition of diffusion and heat
conduction processes reduces the overall effect of electronic excitation on the convective heating,
especially for the Fire II test case. It is shown that reliable models of chemical reaction rates are of
great importance for accurate predictions of the fluid dynamic variables and heat fluxes.
2017-02-07T00:00:00Z
Modeling and control of robot manipulators with the constraints at the moving objects
Kulakov, Felix M.
Alferov, Gennadiy V.
Efimova, Polina
Chernakova, Svetlana E.
Shymanchuk, Dzmitry
http://hdl.handle.net/11701/2066
2016-04-13T00:00:34Z
2015-01-01T00:00:00Z
Название: Modeling and control of robot manipulators with the constraints at the moving objects
Авторы: Kulakov, Felix M.; Alferov, Gennadiy V.; Efimova, Polina; Chernakova, Svetlana E.; Shymanchuk, Dzmitry
Краткий осмотр (реферат): In this paper a method of constructing a model of control over compliant motion of robot manipulators is considered. In this method the elastic deformations of flexible manipulators elements are used as feedback signals. © 2015 IEEE.
2015-01-01T00:00:00Z
The interception problem of a celestial body with the use of the collinear libration points
Shmyrov, Alexander S.
Shymanchuk, Dzmitry
Sokolov, Leonid L.
http://hdl.handle.net/11701/2063
2016-04-13T00:00:28Z
2015-01-01T00:00:00Z
Название: The interception problem of a celestial body with the use of the collinear libration points
Авторы: Shmyrov, Alexander S.; Shymanchuk, Dzmitry; Sokolov, Leonid L.
Краткий осмотр (реферат): This paper studies the problem of an intercept trajectory construction when using the neighborhood of the collinear libration point L1 of the Sun-Earth system. A celestial body motion is considered in a rotating frame within the Hill's problem of the circular restricted three-body problem. It is known that collinear libration points are unstable but its instability can be used as a positive factor for maneuvering a celestial body in the near-Earth space. Development methodology of control algorithms for the orbital motion of a celestial body when using the instability of collinear libration points is offered. The construction of an intercept trajectory is based on the properties of a specially introduced phase variables function, called 'hazard function'. The results of the numerical integration are graphically illustrated. © 2015 IEEE.
2015-01-01T00:00:00Z
Maneuvering in near-Earth space with the use of the collinear libration points
Shmyrov, Alexander S.
Shymanchuk, Dzmitry
http://hdl.handle.net/11701/2061
2016-04-13T00:00:35Z
2015-01-01T00:00:00Z
Название: Maneuvering in near-Earth space with the use of the collinear libration points
Авторы: Shmyrov, Alexander S.; Shymanchuk, Dzmitry
Краткий осмотр (реферат): The use of the neighborhood of collinear libration point (L1 or L2) of the Sun-Earth system has long been of practical importance in connection with projects implemented by NASA and ESA. A celestial body motion is considered in a rotating frame within the Hill's problem of the circular restricted three-body problem. It is known that collinear libration points are unstable but its instability can be used as a positive factor for maneuvering a celestial body in the near-Earth space. For example, it may be used to solve the problem of comet and asteroid hazard to monitor space objects posing threat to the Earth. We offer a methodology for constructing control algorithms for the orbital motion of a celestial body. This methodology is based on the properties of a specially introduced phase variables function called hazard function. Numerical simulation results are given. © 2015 IEEE.
2015-01-01T00:00:00Z
Structural-temporal approach for dynamic strength characterization of gabbro-diabase
Petrov, Y.
Bragov, A.
Evstifeev, A.
Cadoni, E.
http://hdl.handle.net/11701/1950
2016-04-08T00:00:44Z
2015-01-01T00:00:00Z
Название: Structural-temporal approach for dynamic strength characterization of gabbro-diabase
Авторы: Petrov, Y.; Bragov, A.; Evstifeev, A.; Cadoni, E.
Краткий осмотр (реферат): This paper presents some of the results of dynamic compression, splitting and direct-tensile tests of gabbro-diabase using two split Hopkinson bar apparatus. The results of laboratory experiments on specimens without and with notch for a wide range of loading parameters are given. Strength and deformation characteristics of gabbro-diabase were determined experimentally at high strain rates up to 103 s-1. Mechanical characteristics were found to be strongly depended on the strain rate. A uniform interpretation of the rate effects of fracture of the tested gabbro-diabase is given on the basis of structural-temporal approach based on a set of fixed material constants. It is shown that temporal dependences of both the compressive and tensile strengths of the tested material can be effectively calculated using the incubation time fracture criterion.
2015-01-01T00:00:00Z
Structural-temporal approach for dynamic strength characterization of rock
Bragov, A.M.
Konstantinov, A.Y.
Petrov, Y.V.
Evstifeev, A.D.
http://hdl.handle.net/11701/1948
2016-04-08T00:00:46Z
2015-01-01T00:00:00Z
Название: Structural-temporal approach for dynamic strength characterization of rock
Авторы: Bragov, A.M.; Konstantinov, A.Y.; Petrov, Y.V.; Evstifeev, A.D.
Краткий осмотр (реферат): Test results of rock obtained by split Hopkinson bar apparatus and his modifications. A uniform interpretation of fracture rate effects of the tested marble samples is given on the basis of the incubation time approach based on a set of fixed material constants. Time dependences of both compressive and tensile strengths are calculated using the incubation time fracture criterion. © 2015, Institute of Problems of Mechanical Engineering.
2015-01-01T00:00:00Z
Incubation Time Approach to Rock Dynamic Strength Characterization
Evstifeev, A.
Cadoni, E.
Petrov, Y.
http://hdl.handle.net/11701/1947
2016-04-08T00:00:45Z
2012-01-01T00:00:00Z
Название: Incubation Time Approach to Rock Dynamic Strength Characterization
Авторы: Evstifeev, A.; Cadoni, E.; Petrov, Y.
Краткий осмотр (реферат): The dynamic characterization of rocks under intermediate and high strain rates is fundamental to understand the material behaviour in case of heavy earthquakes and dynamic events. The implementation of material constitutive laws is of capital importance for the numerical simulation of the dynamic processes as those caused by earthquakes. These data are necessary and require experimental techniques able to induce on the rock materials state of loading reproducing the actual dynamic condition. Consider the work [1]. The dynamic characterization has been carried out by means of two special apparatus: the split Hopkinson tension bar and the hydro-pneumatic machine. These equipments are briefly described with a discussion on the results of dynamic tension tests at three different strain rates (0.1, 10, 100 strain/s) on Onsernone Orthogneiss for loading directions 0°, 45° and 90° with respect to the schistosity. Results of the tests show a significant strain rate sensitive behaviour, exhibiting dynamic tensile strength increasing with strain rate, up to about two times with respect to the quasi-static conditions in the case of 0° and 45° orientation and more than three times in the case of 90° at high strain rates. © Owned by the authors, 2012.
2012-01-01T00:00:00Z
Temporal peculiarities of brittle fracture of rocks and concrete
Petrov, Y.
Smirnov, I.
Evstifeev, A.
Selyutina, N.
http://hdl.handle.net/11701/1946
2016-04-08T00:00:17Z
2013-01-01T00:00:00Z
Название: Temporal peculiarities of brittle fracture of rocks and concrete
Авторы: Petrov, Y.; Smirnov, I.; Evstifeev, A.; Selyutina, N.
Краткий осмотр (реферат): When we want to compare the strength of two materials, we compare the table values of quasi-static strength. However results of some experiments show that the strength ratio of the materials can change
with increase in rate of loading. Such "substitution effect" of material strength at different strain rates is studied in this paper. It is shown that one material can have a lower dynamic strength for a higher static strength compared to the other material. Tests of two different materials, tests of mortar and concrete, and tests of concrete with different water content are considered. It is shown that load-carrying capacity of materials and the substitution effect of material strength in a wide range of loading rates can be predicted by the incubation time criterion.
2013-01-01T00:00:00Z