System Identification

Dear friends I use matlab system identification of matlab to identify a vibrating system. I use “linear parametric model” for my purpose. The problem is that this procedure gives me the discrete model. And for my problem which is a continuous problem I have to change the system back to continuous which as far as I know is not a good procedure. I wonder is the any way to ask the toolbox to generate the model directly in the continuous form.

special thanks for your attention.

[Gurudatha Pai]

I wonder why you would say that discrete modelling is not a good procedure! (could you explain?) I did some of continuous time adaptive models for an adaptive control course using Simulink and that is all I know about that. In any case, some adaptive control book might give you good idea about continuous time modelling. My experience with it is that you need to have explicit knowledge about the structure of the system and then you could estimate the parameters of these structures. The discrete modelling allows you much more flexibility!

see: K. S. Narendra and A. M. Annaswamy, "Stable Adaptive Systems", Prentice Hall, Inc., New Jersey, 1988.

Answer 1

[Arkadiy Turevskiy]

The capability to identify continuous-time transfer functions has been added in R2012a which just came out. Here is more info:

http://www.mathworks.com/products/sysid/whatsnew.html http://www.mathworks.com/products/demos/sysid/estimating-transfer-functions-and-process-models.html

HTH.

Arkadiy