Nyquist Stability Criterion, Part 1

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Nyquist Stability Criterion, Part 1

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Күн бұрын

Get the map of control theory: www.redbubble....
Download eBook on the fundamentals of control theory (in progress): engineeringmed...
An explanation of the Nyquist Stability Criterion. This video steps through the importance of the criterion, how to interpret the Nyquist plot graphically, and why it is the way it is. This is the first video in the series on Nyquist plots.
Errata:
Matlab Scripts:
NyDemo.m - The automated demonstration of Cauchy's Argument Principle
docs.google.co...
Interact.m - The interactive demonstration of Cauchy's Argument Principle
docs.google.co...
arrow.m - www.mathworks.c...
Don't forget to subscribe! I'm on Twitter @BrianBDouglas!
If you have any questions on it leave them in the comment section below or on Twitter and I'll try my best to answer them.
I will be loading a new video each week and welcome suggestions for new topics. Please leave a comment or question below and I will do my best to address it. Thanks for watching!

Пікірлер: 546

@michaelsutanto6757 3 жыл бұрын

7 years after you uploaded this video, in the middle of a pandemic, you saved a uni student from failing his module. Thanks.

@maurycykujawski6344 3 жыл бұрын

*uni students

@AjayPatel-nv7ep 3 жыл бұрын

we out here

@naga7647 3 жыл бұрын

hey there

@Kallum 2 жыл бұрын

Brian douglas is a saviour to the electrical engineering generation today

@mosaaddiab2068 Жыл бұрын

+1 in 2022❤

@anantikamehra1694 9 жыл бұрын

You not only make me understand, but also make me marvel at the beauty of the stuff you're teaching. You are a brilliant teacher! Thank you so much for taking the time out to make these videos and helping us struggling undergraduates with something that can be so simple, but is generally taught in a way that makes the material inaccessible and scary.

@CallmeKaram 7 жыл бұрын

Anantika Mehra 😂 😂 😂 I have become Fan of your English 😛

@rushilvispute7017 7 жыл бұрын

True!

@howardlam6181 4 жыл бұрын

The reason this is so good is because of the example program he made rather than theorems that are very hard to read because they skip all the derivation steps and just say they are trivial and we should do at our own time.

@BrianBDouglas 11 жыл бұрын

Part two is in my head! I'm working on it now and should have it out within the week. Thanks for watching!

@enesog 3 жыл бұрын

What if the RHS zeros of (1+G*H) are compensated by the zeros of G ? Than you will not have Poles in the RHS of the closed loop system CLTF = G / (1+G*H) Is this case even possible?

@coolwinder 2 жыл бұрын

We need a continuation, this is the most amazing video I saw on this topic! Pls continue working and bringing this kind of insight!

@SaeedAcronia 2 жыл бұрын

Hi Brian, would you let me know what reference books you recommend?

@blakerezachek9804 3 жыл бұрын

Just watched 5 hours of university lectures that didn't even come close to explaining the topic with this level of clarity

@hidansektas 5 жыл бұрын

I LITERALLY CRIED WHEN I UNDERSTOOD IT. ENGLISH ISNT EVEN MY FIRST LANGUAGE SO I HAD TO CONCENTRATE EXTRA HARD . THANK YOU SO FREAKING MUCH

@MsShifs 3 жыл бұрын

Feeling the exact same way lol, i was starting to get super-anxious about my upcoming exam ;;

@hidansektas 3 жыл бұрын

@@MsShifs you got this. i actually graduated since writing the comment. i wish you all the luck in the world i believe in you❤

@MsShifs 3 жыл бұрын

@@hidansektas 💖💝❤️

@tarunfirestoned 10 жыл бұрын

you are a lifesaver dude.you made me understand something easily in minutes which i could not understand for hours together

@itaidagan1 8 жыл бұрын

Blown away by how clear and concise this video is, thank you!

@BoutinMathieu 10 жыл бұрын

I really like the way you teach. The sound and image are both very clear, and you seem motived when you speak. Please keep making more videos!

@BrianBDouglas 11 жыл бұрын

I have placed the two scripts I wrote in Google docs and placed the link in the description. I have not modified the existing Nyquist function in Matlab ... it was just a bit of movie magic! After the plots came up I modified them a little by making the lines thicker and such so it's easier for you guys to see. I just edited that part out.

@AhmedMagdy-xb8bl 4 ай бұрын

You helped me grasp control theory like never before. I now think like a control system engineer. Brian, your dedication to teaching is truly appreciated. Just as scientists advance knowledge, educators like you ensure its transmission. Thank you for your invaluable contribution.

@CyberSherriff 11 жыл бұрын

You're an absolute legend, I failed my summer exam in control and I have my repeats in 4 weeks. Your vids are saving me, and I think I'm finally getting the concept of CONTROL. I wish you the best in life, sincerely.

@goodboi42 2 жыл бұрын

I not only passed my semester but also grew an appreciation for Control Systems because of your lectures. Thank you so much!

@yushaos 10 жыл бұрын

Why are you so good at explaining?!

@BrianBDouglas 11 жыл бұрын

I use Photoshop and a screen capture program. You can see exactly how I do it in my video titled "How I make a control systems lecture video". Cheers!

@abhijitmajee6754 4 жыл бұрын

You must understand that you have a unique gift of God that you can explain things so purely. I feel enlightened by the level of insight you present. Thank you, Sir.

@starimakro4292 Жыл бұрын

Nyquist is one of the coolest names i have ever heard of

@andyhong6951 9 жыл бұрын

My god, I owe you my life man LOL This video saved my day

@extend0908 9 жыл бұрын

阿修是你ㄇ

@nyoomba 3 жыл бұрын

This guy blows my lecturer out of the water, kudos man!

@amysmith6068 4 жыл бұрын

You are an amazing teacher! Thank you so much for making this amazing resource publicly available. You are responsible for many engineering students developing a real understanding of important stuff

@Banarasi_guy 9 жыл бұрын

From basic to the top always the best lecture series :D

@mmpmaldo Жыл бұрын

I came to your channel like a year ago to study bode plots and it was so good I subscribed, today i was seraching for nyquist plots and not only you were once again flawless in your explanation but I also found the control theory map that my teacher used to present the module. You are influencing both students and teachers around the globe, thank you very much and greetings from barcelona!

@assil619 2 жыл бұрын

Sir, you are a Control Systems Theory god. Bless thee for allowing us lowly beings ascend the ladder of knowledge.

@chriskorfmann 2 жыл бұрын

I'll be another drop in the bucket when I say this, but I have to say it. This video is phenomenal. All of your videos that I've watched so far are amazing. I think you're the reason I will pass my control systems course. Thank you for your work.

@theliferulz 4 жыл бұрын

You are a Hero. If they could just fire the lecturer and put your videos in a playlist instead the pass rate would skyrocket.

@SoulSurivor 3 жыл бұрын

Amazing! The reader for my system control class dedicated a whole 400-orso words to Nyquist diagrams... So I am glad to have found someone explaining it to this degree of clearness!

@Amplid00 10 жыл бұрын

Hey man, just wanted to say your online classes are worth 10 of my brain-shrivelling books, I wish I had a teacher like you for every class!! Keep it up, you make all of our lives so much easier!

@parthpatel-dg3db 3 жыл бұрын

The best explanation of the Nyquist plot. I gave up this topic but thanks to you now I can imagine what is the Nyquist plot and why it even exists. thanks, man.

@inigo4688 11 жыл бұрын

This series is fantastic. I wish more people who taught Controls could communicate the concepts as effectively as you do in your videos. Keep up the great work!

@lorenzo180596 4 жыл бұрын

Today I just skipped my lesson in Modern Design of Control System, because i didn't understand the previous ones about Nyquist, so it wouldn't have been useful going to lesson today. Thanks to you, maybe I can go to the next lesson! Love u man

@JudahCaruso 4 жыл бұрын

I clicked here by accident but stayed because it sounded so interesting. Literally had 0 knowledge of the topic at hand, but you were such a good teacher that I feel like I learned something anyway haha

@elisamicaelarodriguezstein2975 3 жыл бұрын

OMFG, I really, really enjoy the way you explain. I know there are too many people who are not from an English speaking country and watch your videos, just like me! Regards from Argentina

@superdogmeatmeat 4 жыл бұрын

I can't count the amount of times I've forgotten how this whole stability thing works and I've had to come back to this video.

@abi1231000 3 жыл бұрын

i learned more from this 15 minute video than a 2 hour lecture I just had

@juanpablodiazbraceli2762 3 жыл бұрын

Same here

@ashchan1998 5 жыл бұрын

Before learning the maths behind a topic, its very helpful for a teacher like you to explain the reasoning and overall picture of whats going on. I feel my knowledge is incomplete without watching your videoes. Thanks for the great work!

@merlissoto3923 7 жыл бұрын

Brian, you have the ability to make all control system theory interesting!

@damianomartucci9814 3 жыл бұрын

Congratulations! Now Nyquist theorem is comprehensible.

@chillingmeko 6 жыл бұрын

I may have failed the first time taking Control Systems class, but this second time with your videos I'm passing. :) Thank you, Brian. You da man!

@wandersonpereira9884 10 жыл бұрын

Brian, you are the best one. Please, make a video about state space control. The world needs it!!!! Thaaks.

@tld5843 4 жыл бұрын

Yes please!!!!!

@coltonjohnson3140 2 жыл бұрын

Geesh.... You are such a good teacher, that made understanding Nyquist stuff so much easier

@user-gk8qc8uu9x 6 жыл бұрын

U save my final exam, I love u.

@victorgabrielmoreleduarte5999 4 жыл бұрын

7 years later and still an awesome video. Thanks man.

@user-hs1qk4jz6p 2 ай бұрын

You are a living legend.. thanks for such an amazing video!! Seriously helped a lot. - Undergraduate student from South Korea -

@yasirpunathil7143 3 жыл бұрын

Thanks alot, Nyquist criterion was a topic I hated because of lack of understanding, I tried many resources including some reference books, but I didn't understand it. Now because of your beautiful explanation, not only that I understood it really well, I could appreciate the beauty of the concept, thanks again

@nicolasavellan3067 2 жыл бұрын

I've been wondering about this for a solid 6 months and it's so much clearer now. Thanks !!!

@hasansukkar2306 7 жыл бұрын

Absolute legend, you deserve an honorary PhD for these beautiful videos!

@nikosips 4 жыл бұрын

This is the best series of starting to learn control theory on youtube ! Thank you very much for your time and effort!

@patrickwang9137 6 жыл бұрын

I have an exam in 2 hours and I am watching this now. Thank you so much for making me understand what I am even learning.

@samar1977gh 2 жыл бұрын

Watching your videos just two nights before my finals. Many thanks!! it's great to hear such a great explanation to this subject

@shivranjinighegde1113 6 жыл бұрын

Sir, OMG. You made my life easier!. I was awestruck when you showed the nyquist plots in matla. It makes so much sens e now. Thanks a ton!

@sharshabillian Жыл бұрын

This really ties everything together into one clearer picture. Much appreciated!!

@keylak8078 7 жыл бұрын

these videos are literally saving me this semester. thank you!!

@rreshikraj253 4 жыл бұрын

sem savers

@leolorenzo52raylewis 4 жыл бұрын

You should run for president! you have a gift at breaking down complicated ideas and explain them so easily to the common man!! hahaha

@Roxzefox 11 жыл бұрын

I'd like to take the time to sincerely thank you for preventing me from failing my control systems course this term.

@MadMax300173 8 жыл бұрын

Awesome explanation of the so smokey Cauchy Argument principle that most text books fail to explain, making it impossible to grasp the real thing! Even 20 years ago when i studied this at the university they gave us quite a smokey explanation compared to this one. Great job! Thumbs up!

@chaitanyagunnu8295 Жыл бұрын

I had no interest in controls until I saw this playlist. He is a pro in explanation.

@jagdishkango9753 8 жыл бұрын

Was way interesting then my lecture You saved the day.

@vidushavithanage7449 5 жыл бұрын

You are a genius man!!! I was never going to understand about the control module without you! Thankyou..

@suhaskulkarni4514 9 жыл бұрын

Absolutely amazing videos. I have understood far more through this 17 min video that i have in an entire semester that spans 5 months. Thank you very much.

@sshanto17 2 жыл бұрын

I learn more from youtube than I did from undergrad and grad school :| Thanks @Brian for making this series.

@nikolatodd1755 4 жыл бұрын

Man, this man is better at explaining than my uni professor. Thank you very much!

@arihantjain8347 7 жыл бұрын

watching only 2 or 3 videos had made me a great fan of yours doing a great job,ecstatic to find you on youtube.

@pjggregory 11 жыл бұрын

Wow! Amazing. I am speaking for everyone when I say could you upload the 2nd part because we all love you and need these videos in our lives. You should be paid for what you do!

@girin9388 7 жыл бұрын

Control Systems has become my favourite subject because of you. Thank you! :)

@achm3dz 9 жыл бұрын

wah....was having so much trouble with Nyquist and this one video (well ofcourse with some previous knowledge of the Nyquist plot) clears most of the things! great work Brain!

@BrianBDouglas 11 жыл бұрын

I know I know! I have the script done and will try to draw it and post it tomorrow. The end of summer has been busy and I've been slacking on these videos :( Best of luck with your exam, I'm glad my videos are helping.

@naofumi6685 5 жыл бұрын

You are best teacher, So I am the best student....actually We all are......& it's hard to find someone like you....Thanks for everything

@marcus4536 2 жыл бұрын

I read Ogata and Nise sometimes about Nyquist but this video helped me more. Thanks a lot and keep with the excellent work.

@CarlosRR02 8 жыл бұрын

Control Systems is so much understandable thanks to your videos, I greatly appreciate it!

@Speechrezz 2 жыл бұрын

This video saved me and the midterm I have to take tomorrow :)

@tusharrohilla7154 6 жыл бұрын

Best lectures on control system in whole you tube

@samrustan 11 жыл бұрын

Thanks for making these videos, Brian. I'm laid-up right now with a broken ankle, so I'm diverting some of my couch and raised-foot time to these lessons. You're really good at driving home the concepts. Just an idea: As a recent EE graduate, I'd like to see a video where you design a simple controls system or model or whatever, but without regard to a generic student. Just a straight-forward, "thinking outloud" version of you working through a problem. Just an idea.

@levuthi 2 жыл бұрын

Brian, you are a funny guy, especially when you expressed your amazement graphing 2 Nyquist plots

@abdurrahimemin1371 4 жыл бұрын

Ms. Braian you are such a brilliant engineer

@AleArg09 6 жыл бұрын

I have a final exam of Control Systems next monday and this helped me a lot to better understanding Nyquist Criterion. Thanks a lot! I subscribed btw

@bigbuckbunny9073 8 жыл бұрын

You've almost saved my life, no words can describe how grateful am I. If you can add some videos about z transform & discrete systems control it will be awesome because my teacher sux :D.

@StefernOKioni 9 жыл бұрын

Thank you! These tutorials have really helped me in learning control engineering!

@BrianBDouglas 11 жыл бұрын

I added the Mathworks link to arrow.m in the description. I'm working on part two now and should have it out within the week!

@alanshalgheen1426 2 жыл бұрын

I'm electronics engineering student and I have to say that because of your tutorials even my smartest control&automation mates at the college will lack the understanding I'm getting here of this basic stiff material..! No one cares for math as it's pure interference with the core of engineering even those elder professors. even if I fail the final for second time, I'm extremely interested in watching this course. Hope you make more content on different areas of "practical control" like microcontrollers and so on. Greetings! 💘

@annikak8101 5 жыл бұрын

Thank you so much! I had already given up on understanding the logic behind Nyquist but now everything makes sense!

@musicbox2310 7 жыл бұрын

I don't knowif your explanation is right or wrong, but I know it's awesome, I don't know why teachers whom I pay lots of money don't explain things like you do. Big like and all the best with your book Brian.

@comradestrawberry1876 3 жыл бұрын

I'm a graduate student in chemical engineering, and for the longest time Nyquist stability criterion was black magic to me.

@danawen555 4 жыл бұрын

thanks for the explanation , you are one of the best youtubers on this area!

@rezajaz6105 7 жыл бұрын

The best teacher i have ever seen

@percywikham7936 3 жыл бұрын

So Douglas, how much information can you pack in 16:39 minutes? Douglas: Yes.

@fedemare92 3 жыл бұрын

I have yet to come across an explanation of this topic that is as clear and intuitive as these videos.

@GabiMartin97 5 жыл бұрын

This video is a masterpiece. I had to watch it many times but I have learned a lot! Thank you very much sir, you are awesome

@SaeEDKh313 8 жыл бұрын

The mickey mouse part made my day :D

@MutianiShawolMVP 7 жыл бұрын

th3FT pUnK looks more like something than a mickey mouse :)

@jeffersonmatalog1534 3 жыл бұрын

@@MutianiShawolMVP yeah a fish ;) C3

@aohua9872 3 жыл бұрын

me too :)) this part is definitely hilarious

@user-qr1en8zn3c 3 ай бұрын

This content is unbelievably good!

@mnada72 3 жыл бұрын

You're awesome, in addition to a great lecture you provide great tools (matlab files)

@user-mw3fe5uj6d 8 жыл бұрын

Brian! YOU are sick man... so good, most clearly explained video ever watched on youtube!

@dogukancetin8906 5 жыл бұрын

you've just saved my engineering carrier , thx bro.

@miguelsoto4628 3 жыл бұрын

Thank you so much, maybe these are the only videos with a good explanation of the theme. Nice job :)

@rodrigosuarez4804 6 жыл бұрын

So clear dude. You are the Man Brian. Infinite thanks to you Sir!

@user-gh7ux5sx1x 7 ай бұрын

Thank you, you just saved my final exam!!!

@flaviusone 11 жыл бұрын

I am also waiting for the second part very anxiously.Exams are coming soon and this is just what i need.

@Ninjinization 9 жыл бұрын

"..This is a topic i didn't really get as an undergraduate student" made me so happy.

@vikasasodariya1368 2 жыл бұрын

My all concepts are cleared regarding the Nyquist plot, after 3 years of learning this in the college lecture. Thank you so much sir.

@SajjQ 5 жыл бұрын

how in the hell can anyone dislike these videos! these are amazing!

@Jnglfvr 3 жыл бұрын

I think that part of the confusion at 14:49 is why you would care about the number of zeros in the RHP. The answer, of course, is that these are zeros of 1 + HG meaning they are the poles of the closed loop transfer function.