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Träfflista för sökning "AMNE:(TEKNIK OCH TEKNOLOGIER) AMNE:(Maskinteknik) ;spr:rus"

Search: AMNE:(TEKNIK OCH TEKNOLOGIER) AMNE:(Maskinteknik) > Russian

  • Result 1-10 of 34
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  • Shakhverdiev, A. K., et al. (author)
  • Alternative concept of monitoring and optimization water flooding of oil reservoirs in the conditions of instability of the displacement front
  • 2019
  • In: Neftânoe hozâjstvo. - : Neftyanoe Khozyaistvo. - 0028-2448. ; 2019:12, s. 118-123
  • Journal article (peer-reviewed)abstract
    • It has always been an urgent issue for the oil and gas industry to improve oil, gas, and condensate recovery at liquid and gaseous hydrocarbon fields developed with the use of artificial formation pressure maintenance techniques that involve injection of water or water combined with other displacement agents. Therefore, due to the aforesaid issues, permanent attention should still be paid to the practical problem of optimizing the non-stationary hydrodynamic pressure applied to a reservoir by regulating the operating conditions of the production and injection wells, development process optimization in general, and water flooding in particular. The theory of Buckley and Leverett, does not take into account the loss of stability of the displacement front, which provokes a stepwise change and the triple value of water saturation. Traditionally a mathematically simplified approach was proposed-a repeatedly differentiable approximation to eliminate the “jump” in water saturation. Such a simplified solution led to negative consequences well-known from the water flooding practice, recognized by experts as “viscous instability of the displacement front” and “fractal geometry of displacement front”. The core of the issue is an attempt to predict the beginning of the stability loss of the front of oil displacement by water and to prevent its negative consequences on the water flooding process under difficult conditions of interaction of hydro-thermodynamics, capillary, molecular, inertial, and gravitational forces. In this study, catastrophe theory methods applied for the analysis of nonlinear polynomial dynamical systems are used as a novel approach. Namely, a mathematical growth model is developed and an inverse problem is formulated so that the initial coefficients of the system of differential equations for a two-phase flow can be deter mined using this model. A unified control parameter has been selected, which enables one to propose and validate a discriminant criterion for oil and water growth models for monitoring and optimizing. 
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  • Berbyuk, Viktor, 1953, et al. (author)
  • Mathematical modeling and optimization of human walking on a below-knee prosthesis
  • 2005
  • In: Int. J. Problems of Control and Informatics. - 0572-2691. ; :3, s. 128-144
  • Journal article (peer-reviewed)abstract
    • The methodology is proposed for determining kinematic, dynamic and energetic characteristics of human walking on a below-knee prosthesis in the case of experimentally prescribed angles at the leg joints. To human walking the approach is used that is based on the formulation of the optimal control problem for corresponding nonlinear dynamical system with phase restrictions and nonsmooth objective function of is evaluated energy consumption. The algorithm for a numerical solution of the problem is developed via parameterization of systems generalized coordinates by cubic smoothing splines, utilization of an inverse dynamics approach, as well as methods of external penalty functions and minimization of nonsmooth functions in the orthogonal directions. The efficiency of the proposed methodology and created algorithm are illustrated by computer simulation of human walking on a below-knee prosthesis over a horizontal surface.
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  • Result 1-10 of 34
Type of publication
journal article (15)
conference paper (12)
book (3)
doctoral thesis (2)
book chapter (2)
Type of content
peer-reviewed (29)
other academic/artistic (5)
Author/Editor
Nosko, A.P. 1983- (11)
Kudinov, Pavel (9)
Nosko, A.L. (8)
Leckner, Bo G, 1936 (5)
Yericheva, V.A. (5)
Bechta, Sevostian (3)
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Palchonok, G.I. (3)
Granovsky, V. S. (2)
Baskakov, A.P. (2)
Belyakov, N.S. (2)
Borodulya, V.A. (2)
Prykhodko, O.A. (2)
Kuklane, Kalev (1)
Holmér, Ingvar (1)
Shestopalov, Yury, 1 ... (1)
Afanasieva, Rallema (1)
Bessanova, Nina (1)
Burmistrova, Olga (1)
Burmistov, V.M. (1)
Breitholtz, Claes, 1 ... (1)
Belov, Ilja (1)
Nosko, Oleksii, 1983 ... (1)
Almjashev, V.I. (1)
Gusarov, V.V. (1)
Khabensky, V.B. (1)
Lopukh, D.B. (1)
Sulatsky, A. A. (1)
Tullin, C (1)
Berbyuk, Viktor, 195 ... (1)
Chernoray, Valery, 1 ... (1)
Tishkin, Vladimir (1)
Bespalov, Michail (1)
Klochkova, Ludmila (1)
Suzan, Dmitriy (1)
Kuleshov, Alexander (1)
Demydyuk, Myroslav (1)
Lytwyn, Bogdan (1)
Borodulya, A.V. (1)
Dikalenko, V.I. (1)
Hansson, Karl-Martin ... (1)
Vinogradov, L.M. (1)
Rabinovich, O.S. (1)
Khutskaya, N.G. (1)
Bulat, A.F. (1)
Voloshin, A.I. (1)
Skrigan, I. N. (1)
Martinov, A. (1)
Vavilov, I.N. (1)
Munts, V.A. (1)
Pavliok, E. Yu. (1)
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University
Royal Institute of Technology (24)
Chalmers University of Technology (7)
Luleå University of Technology (1)
University of Gävle (1)
Jönköping University (1)
Language
Russian (34)Undo refine
Research subject (UKÄ/SCB)
Engineering and Technology (33)
Natural sciences (3)
Social Sciences (1)
Humanities (1)

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