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Finding a transfer function from time series data in simulink

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Zara Freeman
Zara Freeman am 24 Okt. 2021
Kommentiert: Mathieu NOE am 16 Mai 2024 um 9:40
How do you write a code to obtain a transfer function from a graph of time series data that is produced through a simulink model.
  2 Kommentare
Mathieu NOE
Mathieu NOE am 25 Okt. 2021
hello
from time data you can obtain a FRF with matlab function tfestimate

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Antworten (1)

Neelanshu
Neelanshu am 7 Mai 2024
Hi Zara,
As Mathieu mentioned you can obtain a frequency response function with the "tfestimate" function, which assumes the noise is not correlated with either the system input or with the system output.
Furthermore, you can also use the "tfest" function that estimates a continuous-time transfer function system with np poles, using all the input and output signals. The estimation algorithm initializes the estimable parameters using the method specified by the "Initialize Method" estimation option. The initialized parameters are updated using a nonlinear least-squares search method, specified by the "SearchMethod" estimation option. The objective of the search method is to minimize the weighted prediction error norm.
You can also use System Identification app to estimate the transfer function using input and response of the system. You may refer to the following guide for a step-by-step approach to estimate transfer function using the app :
You may refer to the following documentation to learn more about "tfest" function :
Hope this helps.

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