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Wyświetlanie 1-3 z 3
Tytuł:
Internal wave diffraction by a strip of an elastic plate on the surface of a stratified fluid
Autorzy:
Dolai, P.
Dolai, D. P.
Powiązania:
https://bibliotekanauki.pl/articles/265771.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
równanie Kleina-Gordona
płyn warstwowy
metoda Wienera-Hopfa
stratified fluid
Klein-Gordon equation
Wiener-Hopf technique
steepest descent method
Opis:
The problem of internal wave diffraction by a strip of an elastic plate of finite width present on the surface of an exponentially stratified liquid is investigated in this paper. Assuming linear theory, the problem is formulated in terms of a function related to the stream function describing the motion in the liquid. The related boundary value problem involves a hyperbolic type partial differential equation (PDE), known as the Klein Gordon equation. The method of Wiener-Hopf is utilized in the mathematical analysis to a slightly generalized boundary value problem (BVP) by introducing a small parameter, and the problem is solved approximately for large width of the plate. In the final results, this small parameter is made to tend to zero. The diffracted field is obtained in terms of integrals, which are then evaluated asymptotically in different regions for a large distance from the edges of the plate and the results are interpreted physically.
Źródło:
International Journal of Applied Mechanics and Engineering; 2013, 18, 1; 5-26
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Finite Termination Property of an Algorithm for Solving the Minimum Circumscribed Ball Problem
Autorzy:
Gläser, Andreas
Grossman, Christian
Lunze, Ulrich
Powiązania:
https://bibliotekanauki.pl/articles/1373551.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
minimum circumscribed
maximum inscribed
minimum zone
geometrical form elements
coordinate measuring
mini–max problem
steepest
descent
Opis:
In this paper basic mathematical tasks of coordinate measurement are briefly described and a modified optimization algorithm is proposed. Coordinate measurement devices generate huge data set and require adapted methods to solve related mathematical problems in real time. The proposed algorithm possesses a simplified step size rule and finds the solution of the minimum circumscribed ball fitting after only a finite number The iteration is of the steepest descent type applied to the related distance function. But, in contrast to standard algorithms it uses a modified step size rule that takes into account the specific properties of the occurring objective function. This small difference in the code improves the performance of the algorithm and it enables real time use of the proposed method in coordinate measurement machines. The efficiency of the prosed algorithm will be illustrated by some typical examples.
Źródło:
Schedae Informaticae; 2012, 21; 127-139
0860-0295
2083-8476
Pojawia się w:
Schedae Informaticae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimizing properties of an inertial dynamical system with geometric damping : link with proximal methods
Autorzy:
Attouch, H.
Bolte, J.
Redont, P.
Powiązania:
https://bibliotekanauki.pl/articles/205719.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
dynamical systems in optimization
entropic methods in optimization
proximal regularization method
steepest descent method
Opis:
The second-order dynamical system x + [alpha]x + Beta[...] = 0, alpha > 0, Beta > 0, where the Hessian [...]Phi(x) acts as a geometric damping, is introduced, mainly in view of the minimization of [Phi]. Minimizing [Phi] is a problem equivalent to the minimization of the functional [Psi]a,b(x, y) = 1/b^2Phi(x) + 1/2|ax + by|^2, a > 0, b > 0. The latter naturallv appears in the proximal regularization of Phi ; it may also be viewed as an energy. The continuous steepest descent method applied to [Psi]a,b yields a first-order system, which proves to he equivalent to the above-mentioned second-order system, when [Phi] is of class [C^2].
Źródło:
Control and Cybernetics; 2002, 31, 3; 643-657
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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