Nichols Chart, Nyquist Plot, and Bode Plot | Control Systems in Practice
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- Опубліковано 10 лип 2024
- Explore three popular methods to visualize the frequency response of a linear time-invariant (LTI) system: the Nichols chart, the Nyquist plot, and the Bode plot. Learn about each method, including their strengths and weaknesses, and why you may choose one over another.
Find out how each plot presents the gain and phase shift of an LTI system across frequency, and discover how the different ways to present the information can help with system identification and closed-loop controller design.
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the best Brian Douglas
Enforcing lectures with Brain Douglas lessons since nearly 2 years ago. Now, starting lectures about plotting Nichols Charts from Bode Plots. Video posted 3 days after... I'm very lucky haha. Thanks.
Nichols Plot is actually very useful if you have a multi-body system of a very high-order where you need to make sure that all the Eigenfrequencies and Eigenmodes of the system or bodies attached with springs and dampers stay in stable regions. Loop shaping is more intuitive by shifting these curves left and right by also using a combination of controllers such as combining a PID with an Anti-Notch filter simply by knowing their effects on Nichols Plot and adjusting the critical frequencies of the controller parameters.
can you help me like how to draw the graph of amp vs time @ 8:10 for a step response(in matlab)
I like Bode plot bcz i understand them well...And Thank You for such a great video.
Well, this would have been helpful yesterday......before my Control Systems final ;)
You're not supposed to be watching control videos AFTER your final. You're supposed to be core dumping everything you learned during the term to make room for next term!
Core dump complete; except for Microwave Engineering. Need that for later
@@nated1971 man I can feel your pain.
I know it's been a year, but I just came across your comment and was curious. If I might ask, how'd the final turn out?
@@PunmasterSTP I got an A; my Control Systems professor was amazing
Thank you sir, you give me a clear concept.
that man was right about forgiving him for adding trouble to understand with his speed! Man I have never lagged so much in my entire life. but that reminded of a meme, "SAY THAT AGAIN BUT SLOWLY", which is when I realized I could reduced the speed of video, at 0.75x. AND Man I understood!
Thank-you MATLAB and Brian
Perfect explanation, thanks...
Very well explained
I agree that Nicholas plot is the best.
Столько узнал за один короткий урок. Спасибо огромное!
Спасибо!
Great explanation . Thanks
I use Bode and Nichols most often, only used the Nyquist in school.
Brian, could you make a video about Bode Plots as a tool for controller design and stability margins in discrete systems (Z domain) in Matlab?
Thank you so much for your videos, you're the best!
Thank you so much
Nice one Brian
Thank you so much!
Very useful thank you
really appreciated and keep doing
Another upside of the Nyquist plot is that one does not have to worry about phase wrapping. While phase wrapping could cause confusing in a Bode plot or Nichols chart, especially when dealing with noisy experimental frequency response data.
Please make a video on PID tuning methods too......
Wow!
At 6:16 what does "lighty damped mode at 1 rd/s" mean ? At 1rd/s we have the highest gain what's damp got to do with it ?
Hi thank you for video it is very helpful. I have input and output experimental data from time domain with constant frequency. For example, 0.01 rad/s, 0.1 rad/s, 1 rad/s, 10 rad/s. How can I convert these datas to frequency domain and plot bode ?
Brian
am i right? if we want to check stability margins of our Control System we use those plots for open-loop systems and when we want to check for example BW(bandwidth) of our Control System we check closed-loop system?
No. Stability of either an open loop or closed loop system can be checked with these plots. Presumably in many interesting control situations the open loop plant is unstable and the closed loop system makes it stable - you would generally apply this to closed-loop systems - he changes the plots with gain so you can see the changing margin. Bandwidth is the -3dB frequency.
First time hearing Nichols plot
What do you mean by minimum phase? As in minimum shift in phase over the change in frequencies?
I explain it here ua-cam.com/video/jGEkmDRsq_M/v-deo.html
@@BrianBDouglas thank you. Your explanation is on point. Probably the clearest to understand the intuition behind the idea of frequecy sweep.
Türkçe alt yazı ekler misiniz. Perfect explanation, thanks....
But how will we obtain the Nyquist plot of Unstable system experimentally?
with open loop transfer func; as an input.
13:50 When I right click there I don't get the same menu and I tried everything I just don't have these options. Any idea how to get the ''All stability margins''?
Hmm, what version of MATLAB are you using? Do you see a menu at all and what options do you have?
You meantion Links in the description, I do not see any links to read further on the topic :(
I think that you have to add mikhailov plot actually
i dont understand, why (-1,0) is unstable?
It was a good leacture, can someone please tell me why '20' is used in the dB equation at 4:14
(Just copy paste here)
The factor of 20 comes from the properties of logarithms and is related to the base-10 logarithm used in the decibel scale. When we express the voltage gain in dB, we are essentially taking the base-10 logarithm of the ratio of the output voltage to the input voltage and then multiplying by 10 to convert the result to decibels.
The factor of 20 specifically arises from the fact that power is proportional to the square of voltage. In other words, power is proportional to voltage squared (P ∝ V²). When we convert power ratios to decibels, we use 4010 \log_{10}41 because power is proportional to voltage squared. Since voltage is proportional to the square root of power, we need to multiply by 2 to account for this relationship when converting voltage ratios to decibels. This is why we use 4020 \log_{10}41 to convert voltage ratios to decibels.
Therefore, the factor of 20 in the formula is a result of the relationship between power and voltage in the context of expressing gain in decibels.
can anyone help me like how to draw the graph of amp vs time @ 8:10 for a step response(in matlab)
When I add links to comments they get rejected so instead, search for "step function MATLAB" and you'll see how to generate the step response of a dynamic system using the command step().
I prefer Bode plott
Türkçe alt yazı ekler misiniz
Video on PID control:
ua-cam.com/video/71o4lFRBZnk/v-deo.html
make sure that all t
bienvenue les gens de SCL
Is it Brain Douglas..??
Yup, The best.
👋👋👋
@@BrianBDouglas hi brain can you group your video to create separate playlist on your channel .. I found you did for control system in practice, sensors, state space.. for MATLAB channel.. it will be easier to trace these videos through your channel..!!
@@dineshguleria1945 I link to all of my MATLAB Tech Talk Videos at engineeringmedia.com/videos. They are grouped ... but not in a playlist.
@@BrianBDouglas very nice.. learner a lot .. from your videos... Helped to make a strong foundation on a control system..
so this is what my GARBAGE professor was trying to explain!!!