Difference Between Normal Feedback Controller and Robust Controller

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Discussion Overview

The discussion revolves around the differences between normal feedback controllers and robust controllers, particularly in the context of system modeling inaccuracies such as linearization and parameter variations. Participants explore the effectiveness of robust controllers compared to standard feedback mechanisms.

Discussion Character

  • Debate/contested, Technical explanation

Main Points Raised

  • Yaswanth questions whether normal feedback controllers can address model offsets caused by inaccuracies in system representation.
  • One participant suggests that simple feedback does not guarantee system stability and may require additional control mechanisms to manage system errors.
  • Another participant defines robust controllers as those capable of compensating for system variations in both expected and unexpected circumstances, potentially allowing for manageable errors.
  • A participant reminds others to avoid double posting and suggests checking other forums for similar topics.
  • Yaswanth acknowledges the double posting and clarifies the reason for posting in this forum.

Areas of Agreement / Disagreement

The discussion contains multiple competing views regarding the effectiveness and definitions of normal versus robust controllers, and it remains unresolved whether normal feedback can adequately handle model inaccuracies.

Contextual Notes

Participants have not fully explored the implications of system modeling inaccuracies or the specific conditions under which robust controllers outperform normal feedback controllers.

yaswanth_040
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Hi all,
If we misrepresent the Model of the system say we linearized the System Model or any parameter variations like friction, Temp etc.
Will normal feedback takes care of the offset of the Model?
I was confused with Robust Controller. What is it? and How effective is it than normal?

Thank You,
Yaswanth
 
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Simple feedback does not necessarily mean a stable system, normally it doesn't, so you may (more than likely) need some sort of controller to compensate for system error.

What is meant by the term robust is that it can compensate the system adequately in different circumstances, anticipated and (perhaps) unanticipated, without a system hindering error (or just an error you can live with).
 


You should refrain from double posting. Check your post in the Mech Engineering forum.
 


Sorry about that. First I thought that it was Mechanical one and then after not getting any replies I post here.
 

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