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pixel
Joined: 16 Sep 2004
Posts: 569
Helped: 59
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 06 Feb 2005 16:46 Root Locus Technique |
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| Is Root Locus Technique used only for systems with unity gain in feedback loop?
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usernam
Joined: 09 Mar 2004
Posts: 693
Helped: 129
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| 06 Feb 2005 17:50 Re: Root Locus Technique |
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Not necessarily.
You can apply the root locus technique to a system with a feedback gain of H which may not be unity.
To draw the root locus you just have to make the open loop transfer function equal to -1 (for negative feedback) and 1 (for positive feedback).
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JoseLeonardo
Joined: 09 Aug 2004
Posts: 107
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| 07 Feb 2005 21:25 Root Locus Technique |
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| Not, the root locus can be used in all linear systems.
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electron_boy
Joined: 14 Nov 2004
Posts: 193
Helped: 18
Location: Chennai, India
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| 09 Feb 2005 1:34 Re: Root Locus Technique |
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| not necessarily unity feed back system . it is the method used to plot the locus of the poles or zeros of a system when the gain is varied.
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bittware
Joined: 03 Apr 2004
Posts: 199
Helped: 1
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| 14 Feb 2005 14:52 Re: Root Locus Technique |
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Not necessary.
A non unit gain feedback is equivalent to a unit gain feedback with serialized 1/H block at its output. H is the original non unit gain in feedback path.
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djalli
Joined: 10 Nov 2001
Posts: 887
Helped: 15
Location: 1600 Pennsylvania Avenue, Washington DC 20500
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| 15 Feb 2005 9:12 Re: Root Locus Technique |
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| pixel wrote: |
| Is Root Locus Technique used only for systems with unity gain in feedback loop? |
gain varies from zero to infinity
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checkmate
Joined: 25 Feb 2004
Posts: 489
Helped: 35
Location: Toilet Seat
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| 15 Feb 2005 16:20 Re: Root Locus Technique |
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| The very definition of the root locus is the path formed by closed-loop poles as gain varies.
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sabari
Joined: 02 Oct 2004
Posts: 66
Helped: 1
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| 20 Feb 2005 7:48 Root Locus Technique |
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no root locus technique can be evaluated for linear systems whose loop gain varies from zero to infinity
but loop must be closed .
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