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Natural frequency/​discretiza​tion/trans​fer function/Simulink

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Gustavo Araujo
Gustavo Araujo 2020-10-10
评论： Gustavo Araujo 2020-10-11
Hi everyone!
I'm having a issue about how to get a natural frequency on a Matlab Function Block on Simulink. Here's what I got:
- g2 = ((G1*(G2+2*G_previous1+G_previous2))-(g_previous1*(2*C-2*A))-(g_previous2*(C+A-B)))/(A+B+C);
where g2 is a discretized signal based on a second order transfer function (G/ (s^2 + 2ksi wn + 2 wn^2))
where:
A = 4/(T^2);
B = (4*ksi*wn)/T;
C = (wn)^2;
my point is: I fixed the values of wn and ksi, but how can a give a step or damp to get the natural frequency of the system, since the g2, G2 and the previous ones are getting updated when I run my model?
  2 个评论
VBBV
VBBV 2020-10-11
Use damp function to get the natural frequency and damping ratio
%if true
% code
% end
[wn zeta] = damp(sys)
Where sys is the discrete time transfer function of your model obtained using tf

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