File:Ondes cisaillement 2d 20.gif
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Ondes_cisaillement_2d_20.gif (610 × 461 pixels, file size: 528 KB, MIME type: image/gif, looped, 89 frames, 8.9 s)
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Summary
[edit]DescriptionOndes cisaillement 2d 20.gif |
English: Shear wave (transverse wave: seismic S-wave): 2d representation on a 20×20 grid, with an empirical shape (derivative from a gaussian profile, small attenuation with distance); made with Scilab
Français : Onde de cisaillement (onde transversale : onde sismique S) : représentation 2d sur une grille 20×20 grid, avec un profil empirique (derivée d'un profil gaussien, faible d'attenuation avec la distance); réalisé avec Scilab |
Date | |
Source | Own work |
Author | Christophe Dang Ngoc Chan (cdang) |
Permission (Reusing this file) |
GFDL |
Other versions | smaller size: Image:Ondes cisaillement 2d 20 petit.gif; plane wave: Image:Onde cisaillement impulsion 1d 30.gif; other type of body wave: Image:Ondes compression 2d 20.gif |
Source code (scilab)
[edit]Source
clear;
N=25; // taille de la grille
Naff = 20; // taille affichee
centre = N/2; // centre de la grille
L=2; // largeur (loi empirique)
points_initiaux_x = zeros(N,N); // initialisation
points_initiaux_y = zeros(N,N);
for i=1:N
for j=1:N
points_initiaux_x(i,j) = i-centre;
points_initiaux_y(i,j) = j-centre;
end
end
points_finaux_x = points_initiaux_x;
points_finaux_y = points_initiaux_y;
for i=1:N
for j=1:N
d = sqrt(points_initiaux_x(i,j)^2 + points_initiaux_y(i,j)^2);
distance(i,j) = d;
end
end
// fonctions
deff('[e]=profil(r)','e=r*exp(-(r/L)^2)');
// programme principal
unite=0;dizaine=0;
for r=0.1:0.2:centre*1.42 // rayon du front d'onde
intensite = %pi/8*r^(-1/2); // variation avec la distance
for i=1:N
for j=1:N
e = intensite*profil(distance(i,j)-r);
x = points_initiaux_x(i,j) ; y = points_initiaux_y(i,j);
points_finaux_x(i,j) = x*cos(e) + y*sin(e); // rotation
points_finaux_y(i,j) = x*sin(e) - y*cos(e);
end
end
clf;
plot2d(0,0,-1,"010"," ",[-Naff/2,-Naff/2,Naff/2,Naff/2])
for i=1:N
xpoly(points_finaux_x(i,:),points_finaux_y(i,:));
xpoly(points_finaux_x(:,i),points_finaux_y(:,i));
end
nom='test\test'+code2str(dizaine)+code2str(unite)+'.gif';
xs2gif(0,nom,1);
unite = unite+1;
if unite == 10 then
dizaine = dizaine + 1;
unite = 0 ;
end
end
Licensing
[edit]I, the copyright holder of this work, hereby publish it under the following license:
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue |
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license. | ||
| ||
This licensing tag was added to this file as part of the GFDL licensing update.http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue |
File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 15:36, 17 November 2006 | 610 × 461 (528 KB) | Cdang (talk | contribs) | == Summary == {{Information |Description={{en|Shear wave (transverse wave: seismic S-wave): 2d representation on a 20×20 grid, with an empirical shape (derivative from a gaussian profile, small attenuation with distance); made with [http://www.scil |
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