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  1. N

    Why should one use convolution ?

    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...
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    Why should one use convolution ?

    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...
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    Why should one use convolution ?

    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...
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    3 phase power

    thanx a lot russ,i really needed this. :smile:
  5. N

    3 phase power

    hey dlgoff thanx a lot.i shall look into each link and hopefully find what i am loking for and more. Thanx a loooooot!!!
  6. N

    Books Please

    hi es that is a very useful bit of info.I really needed it.Thanx for the same. :smile:
  7. N

    3 phase power

    Hi all, 3 phase power is measured using 2 and 3 wattmeter methods.Correct? can someone explain how these 2 work?I cudn get enuf info on it.
  8. N

    Books Please

    hi, Can someone suggest some good books in Control Systems engg. which includes all from laplace to bode plots,nyquist etc etc. Thanx for any help.
  9. N

    Q is the quality factor of series resonant circuits

    Can someone tell me how to find the Quality factor of a loaded resonant circuit? PLEASEEEEEEEEEEthanks a lot.
  10. N

    Q is the quality factor of series resonant circuits

    i am sorry to be a dumbo but i wish u spelled it out. :redface:
  11. N

    Q is the quality factor of series resonant circuits

    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...
  12. N

    Parallel RL circuit

    okay sgt,now i get it. thanx a loooooooooooooot!
  13. N

    Parallel RL 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.
  14. N

    Parallel RL circuit

    SGT,Thankyou very much indeed. I think i got the stuff in my head atlast. Thankyou. :smile:
  15. N

    Parallel RL circuit

    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
  16. N

    Parallel RL circuit

    I am sorry but I donno how to go abt with the equations.
  17. N

    AC Electrical Theory

    hey astronuc,thanx a looooooooooot! :smile:
  18. N

    Parallel RL circuit

    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?
  19. N

    Parallel RL circuit

    yes,but how to find the values of A1 and A2?
  20. N

    Parallel RL circuit

    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?
  21. N

    Parallel RL circuit

    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.
  22. N

    Parallel RL circuit

    :biggrin: just one more question... why cant it be Acoswt?why the phi? why shud it be coswt?why not sinwt? (am i being really stupid? :rolleyes: )
  23. N

    Parallel RL circuit

    :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:
  24. N

    Parallel RL circuit

    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.
  25. N

    Parallel RL circuit

    Okay i get it.thanx SGT. but ...heheh :biggrin: how do u find the value of A?
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    Parallel RL circuit

    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...
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    Parallel RL circuit

    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:
  28. N

    Solving natural/step response in RL/C circuits

    astronuc,isnt natural response called transient response as well? ng
  29. N

    Parallel RL circuit

    hey sgt,thankyou for that reply.yeah,how stupid of me.....u r right. thanx again.
  30. N

    Parallel RL circuit

    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...
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