[Scilab-users] System Identification for First order delay and dead time

[Fukashiimo]

Dear Denis,


Thank you for your message.

"s" is the Laplace operator and it is not a process input.

 f(u)= (K/(Tau*s+1))*exp(-Td*s)*u

 f(u) is the proess output and u is the process input, such as step input.
 K is the constant, process gain
 Tau is the constant, first order delay time constant
 Td is th constant, dead time

Such case How we can get these constant values from datafit?
Could you please advise?


Thanks.

----- 元のメッセージ -----
差出人: "Denis Crété [via Scilab / Xcos - Mailing Lists Archives]" <ml-node+s994242n4034614h10 at n3.nabble.com>
宛先: "Fukashiimo" <noguchi.japan at gmail.com>
送信済み: 2016年9月25日(日曜日) 06:23:27
件名: Re: System Identification for First order delay and	dead time




Hello, 

If ymodel is (experimentally) proportional to u (and u is not too close to 0), it seems better to adjust z= ymodel/u = f(s). 

I frequently use “datafit” for this purpose. Here f(x)=  (K/(Tau*x+1))*exp(-Td*x). 

HTH, 

Denis 

  

[@@ THALES GROUP INTERNAL @@] 

  

De : users [mailto: [hidden email] ] De la part de Fukashiimo 
Envoyé : samedi 24 septembre 2016 2 3:11 
À : [hidden email] 
Objet : Re: [Scilab-users] System Identification for First order delay and dead time 

  

s is the Laplace operator, u is the process input vatiable, y is the process output variable, 


  


2016/09/24 23:44 "Samuel GOUGEON [via Scilab / Xcos - Mailing Lists Archives]" < [hidden email] >: 

Le 24/09/2016 15:59, Fukashiimo a écrit : 





> Hello, 
> 
> I am looking for a Scilab software which is similar to Matlab System ID tool 
> box. 
> 
> I would like to obtain values of parameters, Tau, K and Td for following 
> first order delay + Dead time model from time series data. 
> ymodel = (K/(Tau*s+1))*exp(-Td*s)*u 
> ymodel: process output, u: process input 
> SISO continuous time 



. 

What is s? What's the input variable: s or u? And is the other a known parameter? 


_______________________________________________ 
users mailing list 
[hidden email] 
http://lists.scilab.org/mailman/listinfo/users 









If you reply to this email, your message will be added to the discussion below: 

http://mailinglists.scilab.org/System-Identification-for-First-order-delay-and-dead-time-tp4034608p4034610.html 


To unsubscribe from System Identification for First order delay and dead time, click here . 
NAML 

  



View this message in context: Re: System Identification for First order delay and dead time 
Sent from the Scilab users - Mailing Lists Archives mailing list archive at Nabble.com. 
_______________________________________________ 
users mailing list 
[hidden email] 
http://lists.scilab.org/mailman/listinfo/users 

Denis Crété 




If you reply to this email, your message will be added to the discussion below: http://mailinglists.scilab.org/System-Identification-for-First-order-delay-and-dead-time-tp4034608p4034614.html 
To unsubscribe from System Identification for First order delay and dead time, click here . 
NAML




--
View this message in context: http://mailinglists.scilab.org/System-Identification-for-First-order-delay-and-dead-time-tp4034608p4034627.html
Sent from the Scilab users - Mailing Lists Archives mailing list archive at Nabble.com.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.scilab.org/pipermail/users/attachments/20160926/bf284e99/attachment.htm>