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


How to define s + 2, no denominator, in a transfer func block in simulink ??

How to define s + 2, no denominator, in a transfer func block in simulink ??

How to define s + 2, no denominator, in a transfer func block in simulink ??

hi to all, have this problem, matlab doesnot allow me to enter just s + 2 defining in the numerator os a transfer func block and leaving nothing or just 1 as denominator, anyway to overcome this? thanks in advance for any help

numerator coefficient = [1 2] , denominator coefficient = [0 1] doesnt work in transfer func block parameters screen

RE: How to define s + 2, no denominator, in a transfer func block in simulink ??

s + 2 isn't a causal transfer function since there is no such thing as a pure derivative, i.e., the s term. You can either send a signal to both a derivative block and a gain of 2 in parallel with each other and then add the output of the two blocks, or you can add a denominator with a high frequency pole (i.e., add a low-pass filter to the derivative function) and normalize the gain, e.g., (as+2a)/(s+b), where b is a positive integer >> 2 and a is b/2. If you have need of the signal into the function to be a step signal, use the latter suggestion, or the derivative block may cause the output signal to blow up.

"Live and act within the limit of your knowledge and keep expanding it to the limit of your life." Ayn Rand, Atlas Shrugged.
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.

RE: How to define s + 2, no denominator, in a transfer func block in simulink ??

thank you xnuke

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!


Overcoming Cutting Tool Challenges in Aerospace Machining
Aerospace manufacturing has always been on the cutting edge, from materials to production techniques. However, these two aspects of aerospace machining can conflict, as manufacturers strive to maintain machining efficiency with new materials by using new methods and cutting tools. Download Now
3D Scanning in the Automotive Industry
With over 100 years of production history, the automotive industry has been at the forefront of manufacturing technology since its inception. Whether the transformative technology of the day was the assembly line, the integration of robotics into the manufacturing process, or the switch from steel to aluminum frame chasses, the automotive industry has consistently implemented advanced technology into its manufacturing and production workflow to improve manufacturing and product performance. Today, the same is true. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close