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Control system  open loop transfer function and open loop gain 
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#1
Nov2012, 04:25 AM

P: 117

Is there any difference between open loop transfer function and open loop gain ?



#2
Nov2112, 02:22 AM

P: 3,143

What if the transfer function was
y = Acos(xt + θ) where θ was a phase shift. What would the gain be? What if the open loop gain varies with frequency? 


#3
Nov2112, 04:54 PM

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PF Gold
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A transfer function gives gain and phase shift at any given frequency. Gain is the first part of that.



#4
Nov2212, 05:47 AM

P: 117

Control system  open loop transfer function and open loop gain
Does this mean that transfer function can provide with negative value due to phase shift !



#5
Nov2212, 07:58 AM

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#6
Nov2212, 08:04 AM

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#7
Nov2212, 09:59 AM

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PF Gold
P: 4,842

Consider H(s) = 1/s^{2}. Letting s = jω you get a gain of 1/ω^{2}, in other words a phase shift of 180 degrees. (This is two integrators in cascade FYI). 


#8
Nov2312, 01:07 AM

P: 296

Open loop transfer function and open loop gain are almost used interchangeably. It's assumed to be the 'A' part (or 'G' part) of your standard feedback loop diagram. Loop gain is the gain after making one lap around the feedback loop from the output of the summer to the input of the summer and is Aβ (or GH) of your standard feedback loop diagram. 


#9
Nov2312, 04:33 AM

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