Curve Fitting a Transfer Function

2015 7 13
1 个回答
更新时间：2015 7 14
23 次查看（30 天）

0 个投票

I have a transfer function in the frequency domain and I am looking to curve fit it into a numerator and a denominator for a system. Is there a specific function that I can use to do so if there are both poles and zeros in the transfer function? I have the standard student version toolboxes as well as the system ID toolboxes.

请先登录，再回答此问题。

回答（1 个）

Sebastian Castro
Sebastian Castro 2015-7-14

0 个投票

In System Identification Toolbox, there is a "tfest" function. Notice that one way to call it is by specifying the data, as well as the number of poles (np) and zeros (nz):
http://www.mathworks.com/help/ident/ref/tfest.html
http://www.mathworks.com/help/ident/ug/how-to-estimate-transfer-function-models-at-the-command-line.html
>> sys = tfest(data,np,nz)
- Sebastian

1 个评论
显示 -1更早的评论 隐藏 -1更早的评论

Michael Harris
Michael Harris 2015-7-14
Thank you Sebastian. I had attempted to use the tfest command previously and the system that I was getting was not even close to a good approximation of my transfer function. The system I was given was just an exponential decay function with no distinct poles or zeros. Do you have any suggestions as to how I can get the tfest command to give me better results?

请先登录，再进行评论。

类别

在 帮助中心 和 File Exchange 中查找有关 Transfer Function Models 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by