restart: eq1:=m*diff(x(t),t,t)+n*c*(diff(x(t),t))+n*k*x(t)=F(t); NiM+SSRlcTFHNiIvLCgqJkkibUdGJSIiIi1JJWRpZmZHSSpwcm90ZWN0ZWRHRi02JC1JInhHRiU2I0kidEdGJS1JIiRHRi02JEYyIiIjRipGKiooSSJuR0YlRipJImNHRiVGKi1GLDYkRi9GMkYqRioqKEY4RipJImtHRiVGKkYvRipGKi1JIkZHRiVGMQ== F(t):=piecewise(t<10,1.8*m,t>=10 and t<=12,0,t>12,0);
NiM+LUkiRkc2IjYjSSJ0R0YmLUkqUElFQ0VXSVNFR0YmNiU3JCwkSSJtR0YmJCIjPSEiIjJGKCIjNTckIiIhMzEsJkYzIiIiRihGMUY1MSwmRihGOSEjN0Y5RjU3JEY1MiIjN0Yo eq1; NiMvLCgqJkkibUc2IiIiIi1JJWRpZmZHSSpwcm90ZWN0ZWRHRis2JC1JInhHRic2I0kidEdGJy1JIiRHRis2JEYwIiIjRihGKCooSSJuR0YnRihJImNHRidGKC1GKjYkRi1GMEYoRigqKEY2RihJImtHRidGKEYtRihGKC1JKlBJRUNFV0lTRUdGJzYlNyQsJEYmJCIjPSEiIjJGMCIjNTckIiIhMzEsJkZFRihGMEZDRkcxLCZGMEYoISM3RihGRzckRkcyIiM3RjA= eq2:=dsolve({eq1,x(0)=0},x(t)): eq3:=rhs(subs(t=0,eq2))=0: x(t):=rhs(eq2): eq4:=subs(t=0,diff(x(t),t,t))=0: vars:={_C2}; NiM+SSV2YXJzRzYiPCNJJF9DMkdGJQ== eqns:={eq4}; NiM+SSVlcW5zRzYiPCMvLCYqKCwmKiZJIm5HRiUiIiJJImNHRiVGLUYtKiQsJiomRiwiIiNGLkYyRi0qKEYsRi1JImtHRiVGLUkibUdGJUYtISIlI0YtRjIhIiJGMkY1ISIjSSRfQzJHRiVGLSNGLSIiJSosLCZGK0YtRi9GLUYyRjVGOSwmKihGOkYtRixGLUY0Ri0iIiZGNSIiKkYtRixGOEY0RjgjRjgiIz8iIiE= soln:=(solve(eqns,vars)); assign(soln); NiM+SSVzb2xuRzYiPCMvSSRfQzJHRiUsJCouSSJtR0YlIiIiLCgqJkkibkdGJUYsSSJjR0YlIiIjISIiKiZGMEYsLCYqJkYvRjFGMEYxRiwqKEYvRixJImtHRiVGLEYrRiwhIiUjRixGMUYyKiZGN0YsRitGLEYxRixGL0YyRjBGMkY0I0YyRjFGN0YyIyIiKiIjNQ== #_C2:=(F*(c^2+c*sqrt(c^2-4*k*m)-2*k*m))/(2*k*c*sqrt(c^2-4*k*m));
#_C2:=0;
m:=100*1000;
k:=1.9635e+08;
c:=k/1000;
n:=2;
NiM+SSJtRzYiIicrKzU= NiM+SSJrRzYiJCImTic+IiIl NiM+SSJjRzYiJCIrKytdaj4hIiU= NiM+SSJuRzYiIiIj #X(t):=subs(_C2=0,m=100*1000,k=1.9635e+08,c=k/1000,n=2,rhs(eq2)):
X(t):=subs(m=100*1000,k=1.9635e+08,c=k/1000,n=2,_C2=-9/10*m*(n*c^2+(n^2*c^2-4*n*k*m)^(1/2)*c-2*k*m)/(n*c*(n^2*c^2-4*n*k*m)^(1/2)*k),rhs(eq2)); 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 k; NiMkIiZOJz4iIiU= with(plots): Warning, the name changecoords has been redefined
NiM+SSJtRzYiIiYrKyI= NiM+SSJrRzYiJCImTic+IiIl NiM+SSJjRzYiJCIrKytdaj4hIiU= NiMkISt5bVc6eSIiJA== plot(X(t),t=10..10.2,labels=["t(s)","x(m)"], title="Oscillations verticales de la charge selon le temps (acc\351l\351ration de 60 000 rad/s^2) " ); 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 force(t):=k*X(t): plot((force(t)+m*9.81/n),t=10..10.9,labels=["t(s)","T(N)"], title="Tension dans les c\342bles selon le temps (d\351c\351l\351ration de 269 rad/s^2)" ); 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#derive_force:=diff(force(t),t)=0; #temps:=solve(derive_force,t): #temps[1];