×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Control systems with different frequencies.

Control systems with different frequencies.

Control systems with different frequencies.

(OP)
Hello,

I'm new in the forum and also kind of new in the Control systems world.
I'm trying to write the transfer functions of a control system:
------------>G1(z)------------>G2(z)----------->

In the z domain (discrete control). The problem is that G2 works at a different sampling rate than G1. That is, there is two blocks that resample the data.

------------>G1(z)------R1(z)------>G2(z)-----R2(z)------>

G1 works at 10Hz and G2 at 2Hz.
So R1 converts the data from 10 to 2 Hz by means of a zero order hold (MATLAB). And R2 converts from 2Hz to 10Hz with a delay (MATLAB).
How can I write the right transfer function of the system considering this?

Thank you very much!

RE: Control systems with different frequencies.

I'm unclear why you would convert back to 10Hz after you basically destroyed 80% of your data.

TTFN
FAQ731-376: Eng-Tips.com Forum Policies
[IMG http://tinyurl.com/7ofakss]
Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers


Of course I can. I can do anything. I can do absolutely anything. I'm an expert!
There is a homework forum hosted by engineering.com: http://www.engineering.com/AskForum/aff/32.aspx

RE: Control systems with different frequencies.

(OP)
IRstuff, the reason is that G2(z) needs to operate at that frequency, and then the output of G2 is input for G1 that operates at 10Hz.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources