written 8.2 years ago by | • modified 5.4 years ago |
Find the value of “K” to limit steady state error to 10, when input to system is {1+10t+20t2}. Here ‘t’ is the time.
written 8.2 years ago by | • modified 5.4 years ago |
Find the value of “K” to limit steady state error to 10, when input to system is {1+10t+20t2}. Here ‘t’ is the time.
written 8.2 years ago by |
G(S)H(S)=k(S2(S+2)(S+3)), r(t)=1+10t+20t^2
=1+10t+40t22
Input is the combination of all the three type, step of magnitude A1=1, Ramp of magnitude A2=10 and parabolic of magnitude A3=40.
Position error kp=\lim_(S\to 0)G(S)H(S)=\lim_(S\to 0)\frac{k}{(S^2 (S+2)(S+3))}=\frac{k}{0}k_p=∞Velocityerror,k_v=\lim_(S\to 0)$ S G(S) H(S)
=lim(S→0) (S.k)(S2(S+2)(S+3))
=k0
kv=∞
Acceleration error, ka=lim(S→0) S2G(S) H(S)
=lim(S→0) (S2k)(S2(S+2)(S+3))
=k((2)(3))
=k6
ka=k6
ess =ess1+ess2+ess3=A1(1+kp)+A2kv +A3ka
=1(1+∞)+10∞+40k6)
=0+0+240k
Since, ess=10
10=240k
k=24010
k=24