hi mike
i am really new to dsp and control systems etc.and there is actually no one who can sit down and explain all this stuff to me.So u see its more of a self study.I am much dependent on the forum and replies from people like you.
i shall see if i can get hold the book u mentioned.I am...
hi berkeman
Thanku for the response.I am actually learning control systems now and came across this DSP stuff in it.
As far as i know DSP is way too hifi to begin in this priliminary stage.Is it not?So i tot i wud stick with understanding Control systems then move on to DSP.I have heard its...
hello
Why shud one use convolution ?Inorder to get the state transition matrix
from
x'=Ax+Bu
x(t)=exp(at)x(0) + integral[exp(a(t-tau)) bu(tau) dtau
where tau is the variable of convolution.
i have read that convolution is used when integration is reqd,for instance,in capacitors and...
Hi all
I read that Q,the quality factor of series resonant circuits is wL/R
------------>1/R sqrt(L/C).This i understand
1.but for parallel resonant it is R/wL....hmm but why is that?this i don quite get.
2.Then what do u mean by loaded resonant circuit and unloaded resonant circuit...
but then sgt,i also read that ip shud be assumed as
acos(wt+phi) + bsin(wt+phi)
not Kcos(wt+phi) as the supply is Vcos(wt+phi).they need not be in phase...
i am confused now.
how u get the steady state and coomplementary solution.
i understood quite a few things from ur replies but not how to reach the
final equations.i am going wrong whenever i try it.
so cud u please help out?thanku again
V=Acos(wt+phi)=Acoswt+Bsinwt
L d^2i/dt +Rdi/dt +i/C=dV/dt
i=A1exp(s1t)+A2exp(s2t)
di/dt=s1A1exp(s1t)+s2A2exp(s2t)
d^2i/dt^2= s1^2A1exp(s1t)+s2^2A2exp(s2t)
i(0)=V/R
if its dc dV/dt=0
ac then dV/dt=-Awsinwt+wBcoswt
is this going wrong?
thanx for the quick response.
For example,
The overdamped case has the solution
v=A1exp(s1t)+A2exp(s2t)
and the equation is of the form
series rlc
L d^2i/dt +Rdi/dt +i/C=dV/dt
cud u please help me?
okay i understand.
Is this used in second order equations as well?
hmm.... an underdamped case for instance
there r two coefficients in it right?
how is that found?
i hope i am notgetting onto ur nerves!
thankyou for all the help.
:smile:
SGT...thanx a million.
i hope i am right this time....
-L(Awsinwt+Bwcoswt)+R(Acoswt+Bsinwt)=RIcoswt
(-LBw+RA)coswt=RIcoswt
-LBw+RA=RI
-LAw+RB=0
solve this to get A and B
w=2 pi f
this approach is used for second order also right?
thankyou once again!!! :approve:
SGT,Thanx again ALOT!!!
So,
for particular solution i assume i=Acoswt
putting in first eqn
Ldi/dt+Ri=RIcoswt
-Lwsinwt+RAcoswt=RIcoswt
equating the coefficients on LHS and RHS
looks like i am going wrong...is it?
please help.
Thankyou corneo,
Okay
so i get
Ldi/dt+Ri=RIcoswt
to get the complementary solution assume
Ldi/dt+Ri=0
int di/i=- intR/L dt
ln i= -R/Lt+K
i=exp(-t/tau+k)
at t=0 initial condition i is V/R
then its..?is it right?
for particular solution i assume i=Acoswt
putting in...
thanx for the reply, corneo
hmm... okay.but i was wondering why shud i assume the solution
Acos(wt+Phi)?
Is this what is assumed for first order circuits subject to ac supply?i read its Acoswt+Bsinwt for second order circuits.am i right?
:confused:
Thanx for the response.I have already seen that and din help me much.
The problem is with getting the transient solution.
RC parallel -If the input is Vcoswt then current throu R will be V/Rcoswt.throu C is
-CwV sinwtThis is te steady state i understand.But the transient and getting to it...