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Träfflista för sökning "hsv:(NATURVETENSKAP) hsv:(Matematik) hsv:(Beräkningsmatematik) srt2:(1985-1989)"

Sökning: hsv:(NATURVETENSKAP) hsv:(Matematik) hsv:(Beräkningsmatematik) > (1985-1989)

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1.
  • Asadzadeh, Mohammad, 1952 (författare)
  • Analysis of a fully discrete scheme for neutron transport in two-dimensional geometry.
  • 1986
  • Ingår i: SIAM Journal on Numerical Analysis. ; 23:3, s. 543-561
  • Tidskriftsartikel (refereegranskat)abstract
    • We derive error estimates for a fully discrete scheme for the numerical solution of the neutron transport equation in two-dimensional Cartesian geometry obtained by using a special quadrature rule for the angular variable and the discontinuous Galerkin finite element method with piecewise linear trial function for the space variable
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  • Asadzadeh, Mohammad, 1952 (författare)
  • $L_p$ and eigenvalue error estimates for the discrete ordinates method for two-dimensional neutron transport
  • 1989
  • Ingår i: SIAM Journal on Numerical Analysis. ; 26:1, s. 66-87
  • Tidskriftsartikel (refereegranskat)abstract
    • The convergence of the discrete ordinates method is studied for angular discretization of the neutron transport equation for a two-dimensional model problem with the constant total cross section and isotropic scattering. Considering a symmetric set of quadrature points on the unit circle, error estimates are derived for the scalar flux in $L_P $ norms for $1 \leqq p \leqq \infty $. A postprocessing procedure giving improved $L_\infty $ estimates is also analyzed. Finally error estimates are given for simple isolated eigenvalues of the solution operator.
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  • Berbyuk, Viktor, 1953, et al. (författare)
  • Mathematical design of gantry robots for automating assembly processes
  • 1989
  • Ingår i: Soviet journal of computer and systems sciences. - 0882-4002. ; 27:2, s. 1-8
  • Tidskriftsartikel (refereegranskat)abstract
    • A methodology for an automatic selection of the structural schema and the parameters of an assembly robot based on an optimization procedure is described. A finite collection of so-called test positions for the operating element which are determined by the robot purpose and by its characteristic movements is specified. The dynamic, strength, etc. characteristics are computed at these test positions for each structural schema and the constraints for the optimization problem are formulated. The procedure for selecting the structural schema of the robot and its technical parameters consists of minimizing some functional for the indicated constraints. An example of computing the parameters of a gantry robot is given.
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10.
  • Berbyuk, Viktor, 1953 (författare)
  • The use of first integrals in problems of synthesizing optimal control systems
  • 1986
  • Ingår i: Journal of Applied Mathematics and Mechanics (English translation of Prikladnaya Matematika i Mekhanika). - 0021-8928. ; 50:1, s. 11-16
  • Tidskriftsartikel (refereegranskat)abstract
    • The problem of synthesizing optimal control of the motion of a non-linear unsteady system is considered. The control quality is evaluated by a functional of mixed type (a Boltz functional). A method of synthesizing optimal control systems is worked out for systems of variational problems with a fixed time and a free right end, based on the use of first integrals of the equations of a free uncontrolled object. The effectiveness of the proposed method is illustrated by examples.
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  • Resultat 1-10 av 42

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