Unobtainable bode plot ?

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aaa
aaa el 2 de Nov. de 2011
Hi,
I am using the bode( and margin( functions. (both are used to make Bode plots)
The issue I am having is with getting the proper "Matlab" form for plotting. it is given here
since i would like to plot the bode plot, matlab needs the transfer function to be in terms of s. in my case, s = j*w_n. However, in the denominator of my transfer function, there is a dependency on 1/(w_n)^2. Using the tf( call convention, i do not believe i can input this transfer function based on what i know.
Does anyone know a way to solve this, or a different way to plot without using tf(? I could not find an obvious way to rewrite and simplify the equation in a form that would satisfy matlab, but at the same time, i highly doubt that it would be "impossible" to plot this.
thanks for all suggestions.

Respuestas (1)

Craig
Craig el 18 de Nov. de 2011
You might want to try this
(j*w_n)^2 = -w_n^2
then you can rewrite the w_n^2 term.

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