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.

This post generated using the online HTML conversion tool

Download the original worksheet

**> 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.

This post generated using the online HTML conversion tool

Download the original worksheet

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.