I need help finding PM and GM for this system.

Answer 1

[Sam Chak]

Hi @marko rois

If you know the dynamic system 'sys', which is commonly described using modeling commands like as tf(), zpk(), and ss(), then use this syntax:

[Gm, Pm, Wcg, Wcp] = margin(sys)

Else, if mathematical model is unknown but you have the frequency response data, consisting of magnitudes (mag) and phase values (pha) measured at the angular frequencies in the ω vector (w), then use this syntax:

[Gm, Pm, Wcg, Wcp] = margin(mag, pha, w)

[marko rois]

the mathematical model is unknown.

can you please show me the calculation method?

[Sam Chak]

Since the model is unavailable, you must have utilized frequency response data. Could you please provide information regarding the source of the data used to generate the Bode diagram displayed below?