Nyquist plot from experimental data

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Niam
Niam 2017-1-31
回答： Star Strider 2017-1-31
I'm trying to make a Nyquist diagram based on experimental data obtained with frequency,output,input respectively as attached in excel for the system.
Unfortunately I couldn't get any help with this problem so far and I haven't found anything relevant online.
I have 3 values containing the collected data (frequency in Hz,output V, input V). Is there a method to ploy the nyquist diagram using the experimental data and not by the transfer function method wher Matlab can generate a nyquist plot from my data obtained.
I dont understand why the plot have 2 graphs individually and maybe my sequence of (Frequency,output,input) in excel is wrong ?
If it has to be done manually, then how should I approach this?
Any explanation, sample code, or perhaps links would be greatly appreciated.

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回答（1 个）

Star Strider
Star Strider 2017-1-31
‘Is there a method to plot the nyquist diagram using the experimental data and not by the transfer function method where Matlab can generate a nyquist plot from my data obtained.’
From the documentation for the nyquist function:
  • nyquist creates a Nyquist plot of the frequency response of a dynamic system model. (emphasis mine)
So in a word, no.

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