16 Jan 2012

Open & Closed Loop Control System - Advantages & Disadvantages

Open & Closed Loop System - Advantages & Disadvantages [Control System].

In control systems engineering, a system is actually a group of objects or elements capable of performing individual tasks. They are connected in a specific sequence to perform a specific function.



A system is of 2 types:

  1. Open loop system which is also called as Manual control system.
  2. Closed loop system which is also named as automatic control system.

In this post, we will be discussing various advantages and disadvantages of the 2 types of control systems.

Open Loop System:
Advantages:
  1. Simplicity and stability: they are simpler in their layout and hence are economical and stable too due to their simplicity.
  2. Construction: Since these are having a simple layout so are easier to construct.

Disadvantages:
  1. Accuracy and Reliability: since these systems do not have a feedback mechanism, so they are very inaccurate in terms of result output and hence they are unreliable too.
  2. Due to the absence of a feedback mechanism, they are unable to remove the disturbances occurring from external sources.

Closed Loop System:
Advantages:
  1. Accuracy: They are more accurate than open loop system due to their complex construction. They are equally accurate and are not disturbed in the presence of non-linearities.
  2. Noise reduction ability: Since they are composed of a feedback mechanism, so they clear out the errors between input and output signals, and hence remain unaffected to the external noise sources.

Disadvantages:
  1. Construction: They are relatively more complex in construction and hence it adds up to the cost making it costlier than open loop system.
  2. Since it consists of feedback loop, it may create oscillatory response of the system and it also reduces the overall gain of the system.
  3. Stability: It is less stable than open loop system but this disadvantage can be striked off since we can make the sensitivity of the system very small so as to make the system as stable as possible.

If you have any queries regarding this topic, you can post your comments below and I will make sure your queries are answered well.
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37 comments:

  1. Thank you for posting the great content…I was looking for something like this…I found it quiet interesting, hopefully you will keep posting such blogs….Keep sharing

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  2. Hello amitbiswal.blogspot.com! My Dad is an electrical engineer and also a mechanical engineer. The Open & Closed Loop System - Advantages & Disadvantages article just opened my mind how a certain design works. I now know that closed loop system is more complex in design and since I am familiar with hi-tech devices as a consumer I am for the close loop system.

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  3. thankx for such publish really helps

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  4. Thank you for the information.

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  5. Thanks for the information.

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  6. This is such a Great resource that you are providing and you give it away for free. It gives in depth information. Thanks for this valuable information.

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  7. thanks alot for this valuable information.

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  8. Anonymous7/03/2012

    I would like to know how feedback loop can create oscillatory response of the system

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  9. Anonymous8/02/2012

    Number of fins in FPC for open loop system

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  10. Anonymous8/13/2012

    what are the control elements of both

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  11. how a open loop is more stable than a close loop system.by making close loop we can make a unstable system to stable also.like if a transfer function is 1/S+1 ,if we make close loop it will become 1/S+2 then close loop pole of the system moving away from imaginary axis and will become more stable also the response time decrease when it becomes close loop. please mail me the answer chhatoi_prabhat@yahoo.co.in i will thank full to you.

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  12. Amazing post publish by you , i think it's very effective information share, thanks for sharing a good knowledge.
    closed loop marketing

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  13. how to get transfer function from a process

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  14. please give me a brief description of equations which are derived from transfer function.

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  15. please give me a brief description of equations which are derived from transfer function.

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  16. if u don't mind please give the example of open and closed loop system at least 25 examples.

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  17. Thankyou for shareing a valueble information

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  18. Thank you for shareing valueble information. I think you can give some ex. And give the such as reasion put on that it's very useful. Thankyou.

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  19. Anonymous1/29/2013

    Thanks a lot. How does the feedback reduce the overall gain of the system in close loop system.

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  20. srikanth1/31/2013

    thanks dude

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  21. Anonymous2/15/2013

    what is differne between the control system and communication systems \

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  22. Excatly what I needed, what a good post

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  23. first i would like to thank you for that great publish information
    second of all can u tell me please which one of these control system is used more frequently and why. i will be so grateful if u gonna answer my
    albhadly87@gmail.com

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  24. first of all i would like to thank you so much for publishing such a good information , secondly can you tell me what kind of them is most frequently used and why ?
    your cooperation is so appreciated
    albhadly87@gmail.com

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  25. • Give the examples for the same for day-to-day and industrial applications.

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  26. • Give the examples for the same for day-to-day and industrial applications.

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  27. Hi Sir, do you modules for Electronic Control Systems? Advantages and Disadvantages of using such system. Thanks!

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  28. thank you too mach and could you list biomedical equipments related to that

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  29. Thank tou all of tou to share information about that I hope tou guys still contribute in our student life thank tou keep help people like us.

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  30. Thank you so much for sharing this information... It was very helpful...

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  31. Thank you for sharing this information... It was very helpful to me :)

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  32. thnx for the information ......but i have small confusion if in close loop system stability is less than open loop system than how it is helpfull to the system.....

    ReplyDelete

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