Problem plotting a transient in edxcel

Discussion in 'Math' started by amilton542, Jan 26, 2013.

  1. amilton542

    Thread Starter Active Member

    Nov 13, 2010
    494
    64
    Hi,

    I want to plot the following transient by means of an edxcel spreadsheet, where:-

     i(t) = 5e^{-3t}\sin(\omega t) and  \omega = 1\ r/s

    Now, I've plotted it using a time interval of up to 3 seconds and it looks nothing like what it should do?

    I think it's down to the sine function operating on time only as an argument, what can I do about this?

    I've made an attempt to post a picture on what it should like, but it says "invalid file."
     
  2. blah2222

    Well-Known Member

    May 3, 2010
    554
    33
    Well, you have two things going on here. You have a very low frequency sine wave (1 rad/s = 159 mHz) that is being tacked onto a very quickly decaying exponential function which dictates the shape of the curve.

    Make sure you to have enough data points to show the curve.
     
  3. amilton542

    Thread Starter Active Member

    Nov 13, 2010
    494
    64
    It's ok, false alarm. The coefficient of 'e' was 0.5 not 5 :p
     
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