Register to reply

Bode Plot Question(Phase and Gain Margin)

by JohnielWhite
Tags: bode, gain, margin, plot, questionphase
Share this thread:
JohnielWhite
#1
May2-11, 02:54 PM
P: 47
I have been drawing a few bode diagram by hand and i am ask to find the phase and gain margin of the plot. Can someone please explain what are phase and gain margin, including how to determine it from the bode plot?
Phys.Org News Partner Science news on Phys.org
New type of solar concentrator desn't block the view
Researchers demonstrate ultra low-field nuclear magnetic resonance using Earth's magnetic field
Asian inventions dominate energy storage systems
berkeman
#2
May2-11, 05:40 PM
Mentor
berkeman's Avatar
P: 40,926
Quote Quote by JohnielWhite View Post
I have been drawing a few bode diagram by hand and i am ask to find the phase and gain margin of the plot. Can someone please explain what are phase and gain margin, including how to determine it from the bode plot?
http://en.wikipedia.org/wiki/Bode_pl...d_phase_margin

These are related to the stability of the system producing the Bode plot. Remember that you have an oscillation condition if your gain is >=1 and you have 180 degrees of phase shift in your negative feedback leg. Gain and Phase margin are two measures of how stable your system is.
JohnielWhite
#3
May2-11, 08:52 PM
P: 47
I now have a better understanding of the significance of the bode plot to a control system. Thanks for your post.


Register to reply

Related Discussions
Bode Plot Question Engineering, Comp Sci, & Technology Homework 2
Finding gain from a bode plot Engineering, Comp Sci, & Technology Homework 1
Bode Phase plot of a second order system Electrical Engineering 4
Question regarding Gain/Phase Margins and Bode Plots Electrical Engineering 3
Phase and gain margin (control) Electrical Engineering 2