Need help with plotting column matrix for bode plot

Forum|Forum|5 years ago
March 15, 2021
2 replies
7017 views

Hi all,

I hope everyone is having a great day!

I am trying to plot a bode plot(i.e gain in dB w.r.t w in rads-1) at specific frequencies inputted in a vector/matrix.

How then do I plot the column matrix('gaindB') with w(rad s-1) on the horizontal axis?

The transfer function is given by f(s) where s represents laplace constant of j*w

I have attached my workings below.

1_Hard-Exam-question.zip

Best answer by LucMeekes

You have to vectorize your expressions (put an arrow above it, look that up in the 'Operators' section on the Math ribbon. It's in the lower-right corner:

I'll leave the phase to you..

The table is easy to reproduce except for the argument at w=0.8. Note that the phase runs on negative continuously, but the argument of a complex number is generally limited to between -pi and pi, or -180 deg and 180 deg.

Success!
Luc

F

Fred_Kohlhepp

23-Emerald I

Because gaindB is a vector taking the magnitude results in a scalar. Vectorize:

1_Hard-Examanswer.zip

L

LS_9861888

1-Visitor

The numeric value on the right-hand side of each equation is substituted for the name on the left-hand side in the expressions that define the model. No checking is done during the substitution to determine whether the substituted value is valid.