Problem was the funtion subs, now I use A:=algsubs(t=k,Y): :-) THANKS

Thanks, but y033 is variable like any others, not y*0.33

> with(inttrans):

Y:=2.500000*(.859671*s+.141289+1.180386*s^2)*exp(-1.5*s)/(8.*s^3+6.*s^2+s+2.149179*exp(-1.5*s)*s+.353223*exp(-1.5*s)+2.950966*exp(-1.5*s)*s^2)/s;

>

>

> invlaplace(Y,s,t);

>

Can anybody help mi please with this problem? Is there any other method to transfer this function Y to time area? Thank u.

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> with(inttrans):

Y:=2.500000*(.859671*s+.141289+1.180386*s^2)*exp(-1.5*s)/(8.*s^3+6.*s^2+s+2.149179*exp(-1.5*s)*s+.353223*exp(-1.5*s)+2.950966*exp(-1.5*s)*s^2)/s;

>

>

> invlaplace(Y,s,t);

>

Can anybody help mi please with this problem? Is there any other method to transfer this function Y to time area? Thank u.

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My mistake.Sorry. I would like to say: I don`t know how to integrate time delay into the differential equation. restart: with(plots): with(inttrans): with(linalg): Gp:=(2.5*exp(-1.5*s))/(8*s^2+6*s+1); #transfer function with time delay 1.5 OK y:=invlaplace(Gp/s,s,t); plot(y,t=0..25); #OK r0:=0.8596719212: ri:=0.1412895895: r1:=1.180386450: Gr:=r0+ri/s+r1*s; #PID controller OK Y:=(Gr*Gp)/(1+Gr*Gp): #closed loopback OK Y:=normal(Y); #OK y:=invlaplace(Y/s,s,t); #??? this is the problem, should I use differential equation? plot(y,t=0..25); #??? how? Or should I transfer it to differential equation??Thanks

My mistake.Sorry. I would like to say: I don`t know how to integrate time delay into the differential equation. restart: with(plots): with(inttrans): with(linalg): Gp:=(2.5*exp(-1.5*s))/(8*s^2+6*s+1); #transfer function with time delay 1.5 OK y:=invlaplace(Gp/s,s,t); plot(y,t=0..25); #OK r0:=0.8596719212: ri:=0.1412895895: r1:=1.180386450: Gr:=r0+ri/s+r1*s; #PID controller OK Y:=(Gr*Gp)/(1+Gr*Gp): #closed loopback OK Y:=normal(Y); #OK y:=invlaplace(Y/s,s,t); #??? this is the problem, should I use differential equation? plot(y,t=0..25); #??? how? Or should I transfer it to differential equation??Thanks

I used with(inttrans) of course and I used 9.5 version of Maple...My problem is more mathematical maybe, cause I don`t know how to use differential equation and integrate time delay to them.

I used with(inttrans) of course and I used 9.5 version of Maple...My problem is more mathematical maybe, cause I don`t know how to use differential equation and integrate time delay to them.