×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• Best Of All, It's Free!

*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.

# The Output of Closed loop control system in the Transfer function.3

## The Output of Closed loop control system in the Transfer function.

(OP)

### RE: The Output of Closed loop control system in the Transfer function.

'a' and 'b' are merely two different viewpoints of the same system... why would Y(s) be different between them? Look at it from an instantaneous instant, not like a digital system where states need time to work through the system.

Dan - Owner
http://www.Hi-TecDesigns.com

### RE: The Output of Closed loop control system in the Transfer function.

(OP)
It’s simultaneously the same thing !?!?

But it’s just hard to understand practically.
Like this example.
We put a desired goal into the system.
And the sensor detect the output.
Then the sensor give a signal back to amplifier to compare the desired goal and generate a new output.
So Y(S) in a will be different than in b

Or it’s a very quick action that it is simultaneous so the output will be the same?

### RE: The Output of Closed loop control system in the Transfer function.

> Or it’s a very quick action that it is simultaneous so the output will be the same?

The output Y(s) is the same output that is fed back through H(s) and subtracted from the input (negative feedback loop).

Is the physical feedback instantaneous? Depends on the physical system.
But either way the definition of H(s) will include any delays or other filtering that occur in the feedback loop of the physical system..

=====================================
(2B)+(2B)' ?

### RE: The Output of Closed loop control system in the Transfer function.

The whole purpose of doing this in Laplace transform space is to replace integrals and derivatives with algebraic equations. In Laplace space, all you care about is the frequency space results. The inverse Laplace transform brings you back into the time domain and its concomitant time and phase delays

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm

### RE: The Output of Closed loop control system in the Transfer function.

(OP)
Oh! Laplace transform!
Now I can managed to grasp the concept a little bit.
It's an instantaneous instant.
Thank you all so much.

#### 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.

#### Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a partâ€™s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. 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:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!