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x = [650 -450 720 460 750 -750 350 -450 550 70 550]; %%-- Ò¦ÎÀÐÇ£¨2003£© ±í3.4
sigma = [0 300 500 600 700 800]; %%-- Ò¦ÎÀÐÇ£¨2003£© ±í3.2
epslon = [0 0.2 0.4 0.6 1 2];
depslon = diff(epslon);
dsigma = diff(sigma);
nx = length(x);
ns = length(dsigma);
drag_s = zeros(ns,nx);
pres_s = zeros(ns,nx);
drag = ones(ns,1);
pres = ones(ns,1);
xpre = 0; cpre = 0;
sgm = zeros(nx,1); outsgm = [];
epl = zeros(nx,1); outepl = [];
for k = 1: nx
csgm = xpre; cepl = cpre;
ki = 1;
sgm(ki) = csgm; epl(ki) = cepl;
if x(k)> xpre
sgn = 1;
coef = drag;
else
sgn = -1;
coef = pres;
end
%
while ki<= ns
csgm = csgm + dsigma(ki) * coef(ki) * sgn;
cepl = cepl + depslon(ki) * coef(ki)* sgn;
if sgn*csgm < sgn*x(k)
coef(ki) = 0;
ki = ki+1;
sgm(ki) = csgm; epl(ki) = cepl;
else
det = abs(x(k) - sgm(ki))/dsigma(ki);
sgm(ki+1) = sgm(ki) + dsigma(ki) *det *sgn;
epl(ki+1) = epl(ki) + depslon(ki)*det *sgn;
coef(ki) = coef(ki)-det;
break;
end
end
%
if x(k)> xpre
drag = coef;
pres = 2-coef;
else
pres = coef ;
drag = 2-coef;
end
xpre = x(k);
cpre = epl(ki+1);
drag_s(:,k) = drag;
pres_s(:,k) = pres;
plot(epl(1:ki+1), sgm(1:ki+1), 'b+--', 'linewidth',1);
end |
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