Why open loop transfer function ?

AI Thread Summary
The use of open loop transfer function G(s)H(s) for drawing root locus is preferred because it is readily available in factor form, simplifying the modeling process. This approach allows for easier identification of poles and zeros by multiplying the transfer functions of individual components. In contrast, the closed loop transfer function presents challenges in finding its roots. The clarity and accessibility of open loop transfer functions make them a practical choice for analysis. Understanding these advantages clarifies the rationale behind using open loop transfer functions in control system design.
reddvoid
Messages
118
Reaction score
1
I don't understand why always we use open loop transfer function G(s)H(s) to draw the root locus.
can somebody please clarify my doubt.




Thanks in advance.
 
Engineering news on Phys.org
because G(s)H(s) is easily available in factor form as it is obtained by simply modelling the transfer functions of individual components and multiplying them . this helps in obtaining the poles and zeroes easily as opposed to closed loop transfer function whose roots are hard to find.
 

Thread '3-terminal device external modeling'

Very basic question. Consider a 3-terminal device with terminals say A,B,C. Kirchhoff Current Law (KCL) and Kirchhoff Voltage Law (KVL) establish two relationships between the 3 currents entering the terminals and the 3 terminal's voltage pairs respectively. So we have 2 equations in 6 unknowns. To proceed further we need two more (independent) equations in order to solve the circuit the 3-terminal device is connected to (basically one treats such a device as an unbalanced two-port...
View full post »

Thread 'Question about the voltage between two charged capacitors'

suppose you have two capacitors with a 0.1 Farad value and 12 VDC rating. label these as A and B. label the terminals of each as 1 and 2. you also have a voltmeter with a 40 volt linear range for DC. you also have a 9 volt DC power supply fed by mains. you charge each capacitor to 9 volts with terminal 1 being - (negative) and terminal 2 being + (positive). you connect the voltmeter to terminal A2 and to terminal B1. does it read any voltage? can - of one capacitor discharge + of the...
View full post »
Thread 'Weird near-field phenomenon I get in my EM simulation'

Thread 'Weird near-field phenomenon I get in my EM simulation'

I recently made a basic simulation of wire antennas and I am not sure if the near field in my simulation is modeled correctly. One of the things that worry me is the fact that sometimes I see in my simulation "movements" in the near field that seems to be faster than the speed of wave propagation I defined (the speed of light in the simulation). Specifically I see "nodes" of low amplitude in the E field that are quickly "emitted" from the antenna and then slow down as they approach the far...
View full post »

Similar threads

Stability of an open loop controller
Replies
3
Views
1K
Open loop vs Closed loop Transfer Functions
Replies
16
Views
25K
Concept of 'encirclement' in Nyquist plot
Replies
1
Views
3K
H(ω) and H(s) as transfer functions
Replies
1
Views
3K
Why Does the Open Loop Transfer Function Include H(s)?
Replies
1
Views
10K
Open Loop Representation of Closed Loop System
Replies
5
Views
3K
Magnitude of the transfer function
Replies
30
Views
5K
Resonant Frequency and Transfer Functions
Replies
1
Views
3K
Can a Transfer Function be Used with a Fuzzy Controller for a Prosthetic Hand?
Replies
1
Views
1K
Help with a control system for a hydroelectric tank
Replies
3
Views
1K

Hot Threads

Recent Insights

Back
Top