entire semester i couldnt get shit about all this root locus thing, and just spending 30 mins watching 3 videos from your channel clarified everything , why don't they hire people liek you in unis
+Ian lucky me my controls professor actually does research in engineering education along with power, however she still sucked at discussing root locus analysis.
+Ian Funny thing is that my prof that teaches this class, doesn't even do research...so explain that shit...not to mention the guy was in industry back in the 70s when process control consisted of physical nobs you turn. He literally still references that...smh
Hey Grisha..... Brian D. doesent need to join any university as he is already a system engineer at PLANETORY RESOURCES ..... I think his work must be that interesting and enjoyable to him, as he work in that great company like PR
Thanks to everyone who requested the Matlab demo. If there is strong enough interest in a topic I will try to cover it, and it sounds like there is for this topic. I'm going to use Matlab to design the controller for the robotic car videos that I'm putting out every other week. I'll cover root locus again there. Stay tuned! :)
Thanks for such a nice comment. Maybe one day I'll compile my notes into a book, or even just something downloadable from a website. I like the UA-cam style lectures though because it reaches a broad audience and people can view it for free. I wouldn't want to exclude anyone from being able to learn from or watch my lectures because they couldn't afford it.
These videos genuinely make me emotional thinking that someone out there cares this much to make this. Thank you so much Brian. You are single-handedly saving thousands and thousands of engineers.
@@rohitronie I've lost the PDFs for my early videos :( For some of the later ones, I've posted to Patreon. I don't charge people on Patreon anymore so if you become a patron you can download the ones I have and then unsubscribe and you won't be charged anything. You can also get a book in progress from my website engineeringmedia.com.
I know this video is from several years ago, but your series of videos about the root locus helped me understand it in ways my professor never has. Thank you so much for making these, they have been a tremendous asset for me.
Hi Brian. Thank you for your great work! I am writing a test tomorrow on the root locus method and you helped me to completely understand it in 40 minutes. I just had to go look up the techniques on how to determine the exact intercepts of the curves, but after this it was easy! For a guy that's a bit lazy when it comes to class attendance, this is a life saver. The prof and the textbook uses so much jargon and excessive amounts of math that this looks really difficult, but it really isn't. The proofs and math can come after you've got the concept. So this is great!! I'm off to watch a few videos about bode plots as well... Greetings from South Africa!
Your videos are amazing, You accomplish what my professors fail to in less time. What makes it even better is youtube allows me to watch you in 2x speed which is surprisingly still easy to comprehend. So instead of going to 50 minute lecture and failing to understand the material. I stay at home, open UA-cam, and become a master of root locus in 25 minutes. You Sr are the future of education. If its not too late please make the matlab video!
Man this is everything i needed, its already been said but i dont know how you can make this all click in 30ish minutes but 6 weeks of lectures and tutorials had me still scratching my head, you sir are the GOAT, sending love from australia 3 years later
you are the best control theory teacher of the world. You might not be the one with the longest CV or most number of researches, but I'm 100% sure you are the best control theory teacher ever.
Brian thank you so much! My professor is a smart guy, he graduated from MIT, but there's just not enough time to explain all of this with this level of detail. Because of you I'll be able to finish my homework I've been stuck on for days! Forget George Washington and Isaac Newton, they need to teach us about you in school! Brian Douglas, my hero!
This series of videos is definitely worth the $500 it cost me to take this course at the university, the problem is, the course at the university is worth $50 for the teaching level we get... but in reality this is free and the university is $500... The paradox of marketing what a degree at a university is really worth. Thank you Brian Douglas, you da man.
After 6 years, this is still better than most professors that teach in top tiers universities. you taught me up to 70% of this course in just one day thanks to your videos about PID, Rootlocus, Bodeplots and compensators. The guy 4 years ago is right, thousends of students owe you some nice beers
Dude you're a lifesaver. I've got a controls exam tomorrow morning and I was nearly at my wit's end trying to understand how to sketch a root locus plot. I think these videos finally helped me "get" it.
Jesus Christ these videos are so good. Why don't professors teach like this guy. I understand you have to learn all the theory, proofs and derivations. I'm ok with that but they never "close the loop" by telling you why all this matters. What the big picture is. I stopped reading my controls book and decided to watch a few videos on youtube. It is amazing that I can watch 30 minutes (two videos) from this guy and save myself 3 hours of time if I were to read the book and work the examples. These videos are great. Keep up the good work man!
OMG!! where have you been since I started control systems. I have been watching most of your videos like bode plots and root locus and I clearly understood them. I spent 12 weeks going to uni and not getting anything. Thank you Brian
Hi Michael, you've come across a tricky one! If you simplify hp it will be more obvious. hp = -6 * (s-1)*(s+1) / (s*(s+2)*(s+3)). When you solve for the root locus you are adding a gain, k, in line with this. However, since the gain of this transfer function is negative (-6), when you sweep k from 0 to +inf, the gain actually goes from 0 to -inf. This flips the root locus to the other side. In matlab you can do rlocus(-sys) to get the positive gain root locus.
Hi Randy, thank you for the offer but you don't need to send me any money. I make a small amount of money from the ads and that's fine by me. I did post a PO Box under the "about" section on my channel page. Some people have wanted to send me t-shirts and other things to feature in an up coming video. I love getting mail and things like that are always fun. Thanks for watching.
Also, please don't ever stop drawing your cartoons during your videos! They help take the seriousness away from the topic but equally they are a great way of conveying information in a casual and understandable way. Cheers.
Brian, your videos are awesome and it really help me to grasp the basics and then go to the books. A MATLAB tutorial on this, root locus, and on how to design a PI and a PID controller along with a plant would be very helpful. Keep your good work.
You Sire, are a hero. No seriously, how are you NOT part of the Avengers team is beyond me. You're saving lives here - mine included. Thank you, wonderful lecture, so easy to grasp even for thick folks like me.
I just want to commend and thank you on this video. Not only did it help clear up a bunch of questions I had, but the links and suggestions you provided in the description was also extremely helpful.
Thanks mate really! At first I came here with the intention of just learning the procedure to solve the root locus! But after watching your first video I found out that it's a subject that I have to learn! your method is awesome! Now I feel it's something fun to do,rather that a pain in the a**!! THANKS AGAN.
Hello Raja, no the rules do not change ... however you have to be careful when dealing with roots in the RHP. The basic transfer function for a real pole is [ Wo / (s + Wo) ]. If you place a pole in the RHP then Wo would be negative which then makes the numerator negative (e.g. -5/(s-5)). This negative gain will switch the direction of the root locus to K = 0 to -infinity. So as long as you keep track of the sign and account for it the rules for the root locus are the same. Hope that helps.
Brian, Your lectures are just brilliant! I was having a really hard time with this topic, but you have helped me so much. Please, keep doing this videos with so much dedication, you are just right.
Brian, you're the best. Thanks for putting these out, it really helped solidify my understanding of root locus plots beyond what I'm getting in class. Keep up the great stuff!
You are saving my skin bro. I need only to pass this course to get my Computer Hardware degree. I took this course as an optional one and became totally lost. Your Video is the best explanation I could find over the internet.....and the competition isn't even close. You Rock.
I love your videos, they make the material a lot more accessible than my textbook or professor and you really show the big picture and get me excited about learning this.
Awesome, I just finished the chapter about root locus and watching this video was a awesome resume! Especially the end put everything in some context by showing actually application! Thank you so much ! Great videos!!!
i struggled in the 2nd video and 3rd video but when i went back to the introduction video, everything is pretty clear. thanks sir! u saved alot of students worldwide =)
Your videos are a huge help for getting a better understanding of control systems. Thank you for making them! I'd love to see one about the Kalman filter in the future.
Thanks so much, this video was extremely helpful! I really appreciate how clear and concise you make the topic. Much easier to follow than my professor's notes!
@ Brain Douglas after 7 years of posting this video i am greatful to watch at this moment. Much appreciated best video regarding root locus. Kudo's to you man.
From now on, I am not going to class anymore. Why waste two weeks of my precious time and gas by going to class and learn absolutely nothing when I can learn two chapters in a 16 minute BD video. Merci dude
First off, job well done here with all three videos. Second, you should come teach my chemical engineering process control class at Oregon State University. My professor is about 1000 years old and has zero idea how to connect the physical explanation with the theoretical and mathematical concepts. You have done this brilliantly. Jokes aside, you should actually consider teaching this course...thank you so much!
It actually doesn't matter since you can't have a root off the real line (with an imaginary component) without having a second one on the opposite side of the real line (the complex conjugate). Therefore, since they are always mirrors of each other once they leave the real line it doesn't matter which one goes up and which one goes down. In fact, if I had drawn the root locus with the same color instead of two colors you woudn't be able to tell which I drew up and which down. Hope this helps.
You probably hear this too often, but truly from my heart: thank you so much!! My control theory teacher can learn a lot about teaching from you haha!!
If you did tutorials on how to design and analyze control systems on Matlab and Simulink that would be beyond amazing. I wish you were my control system professor I would have learned so much, but it's never to late to learn. Thank you so much for these videos.
entire semester i couldnt get shit about all this root locus thing, and just spending 30 mins watching 3 videos from your channel clarified everything , why don't they hire people liek you in unis
+Grisha Gevorkyan University professors couldn't give less of a shit lol
+Grisha Gevorkyan Because university is about doing research they just teach so they can afford to do the research.
+Ian lucky me my controls professor actually does research in engineering education along with power, however she still sucked at discussing root locus analysis.
+Ian Funny thing is that my prof that teaches this class, doesn't even do research...so explain that shit...not to mention the guy was in industry back in the 70s when process control consisted of physical nobs you turn. He literally still references that...smh
Hey Grisha..... Brian D. doesent need to join any university as he is already a system engineer at PLANETORY RESOURCES ..... I think his work must be that interesting and enjoyable to him, as he work in that great company like PR
MAN, it is not that my teacher is bad, but this explanation is incredible.
Thanks to everyone who requested the Matlab demo. If there is strong enough interest in a topic I will try to cover it, and it sounds like there is for this topic. I'm going to use Matlab to design the controller for the robotic car videos that I'm putting out every other week. I'll cover root locus again there. Stay tuned! :)
Thanks for such a nice comment. Maybe one day I'll compile my notes into a book, or even just something downloadable from a website. I like the UA-cam style lectures though because it reaches a broad audience and people can view it for free. I wouldn't want to exclude anyone from being able to learn from or watch my lectures because they couldn't afford it.
These videos genuinely make me emotional thinking that someone out there cares this much to make this. Thank you so much Brian. You are single-handedly saving thousands and thousands of engineers.
why our instructors cant explain the way you did... and yes i wan the MATLAB video
thanks to you man
Zalan Mahmood Working on it at this very moment! Thanks for the comment.
@@BrianBDouglas can i get the link of that video please!
@@rohitronie I think it was this video: ua-cam.com/video/pG3_b7wuweQ/v-deo.html. But that was forever ago so I could be wrong :)
@@BrianBDouglas how about sharing pdf of yours lectures to we beginners.
@@rohitronie I've lost the PDFs for my early videos :( For some of the later ones, I've posted to Patreon. I don't charge people on Patreon anymore so if you become a patron you can download the ones I have and then unsubscribe and you won't be charged anything. You can also get a book in progress from my website engineeringmedia.com.
I know this video is from several years ago, but your series of videos about the root locus helped me understand it in ways my professor never has.
Thank you so much for making these, they have been a tremendous asset for me.
Hi Brian. Thank you for your great work! I am writing a test tomorrow on the root locus method and you helped me to completely understand it in 40 minutes. I just had to go look up the techniques on how to determine the exact intercepts of the curves, but after this it was easy! For a guy that's a bit lazy when it comes to class attendance, this is a life saver. The prof and the textbook uses so much jargon and excessive amounts of math that this looks really difficult, but it really isn't. The proofs and math can come after you've got the concept. So this is great!! I'm off to watch a few videos about bode plots as well... Greetings from South Africa!
Awe bra! waar studeer jy? Ek is by UCT
The world needs more teacher like you. Taiwan needs more professors like you. So helpful, thank you so much!!
You sir, are a legend. And YES PLEASE to a matlab tutorial!!
Hello Mr. Brian, count me in too for the Matlab Controls Tutorial. And thank so much for the Videos, It's a awesome,
count me in
Your videos are amazing, You accomplish what my professors fail to in less time. What makes it even better is youtube allows me to watch you in 2x speed which is surprisingly still easy to comprehend. So instead of going to 50 minute lecture and failing to understand the material. I stay at home, open UA-cam, and become a master of root locus in 25 minutes. You Sr are the future of education. If its not too late please make the matlab video!
I highly encourage the 2 times speed for all online video lecture watchers, i find myself paying more attention and having overall more time to work
My man still educating people for almost a decade now. Thank you very much.
Man this is everything i needed, its already been said but i dont know how you can make this all click in 30ish minutes but 6 weeks of lectures and tutorials had me still scratching my head, you sir are the GOAT, sending love from australia 3 years later
you are the best control theory teacher of the world.
You might not be the one with the longest CV or most number of researches, but I'm 100% sure you are the best control theory teacher ever.
Brian thank you so much! My professor is a smart guy, he graduated from MIT, but there's just not enough time to explain all of this with this level of detail. Because of you I'll be able to finish my homework I've been stuck on for days! Forget George Washington and Isaac Newton, they need to teach us about you in school! Brian Douglas, my hero!
This series of videos is definitely worth the $500 it cost me to take this course at the university, the problem is, the course at the university is worth $50 for the teaching level we get... but in reality this is free and the university is $500... The paradox of marketing what a degree at a university is really worth. Thank you Brian Douglas, you da man.
After 6 years, this is still better than most professors that teach in top tiers universities. you taught me up to 70% of this course in just one day thanks to your videos about PID, Rootlocus, Bodeplots and compensators. The guy 4 years ago is right, thousends of students owe you some nice beers
Dude you're a lifesaver. I've got a controls exam tomorrow morning and I was nearly at my wit's end trying to understand how to sketch a root locus plot. I think these videos finally helped me "get" it.
Jesus Christ these videos are so good. Why don't professors teach like this guy. I understand you have to learn all the theory, proofs and derivations. I'm ok with that but they never "close the loop" by telling you why all this matters. What the big picture is. I stopped reading my controls book and decided to watch a few videos on youtube. It is amazing that I can watch 30 minutes (two videos) from this guy and save myself 3 hours of time if I were to read the book and work the examples. These videos are great. Keep up the good work man!
OMG!! where have you been since I started control systems. I have been watching most of your videos like bode plots and root locus and I clearly understood them. I spent 12 weeks going to uni and not getting anything. Thank you Brian
These videos are life-savers. Thank you for your clear explanations!
I wish I would have found these videos much, much earlier in the semester. I owe my grade, and quite possibly my life to you, sir. Keep it up!
Hi Brian, Thank you so much, viewing after 10 years of upload and still no other video has done better.
Hi Michael, you've come across a tricky one! If you simplify hp it will be more obvious. hp = -6 * (s-1)*(s+1) / (s*(s+2)*(s+3)). When you solve for the root locus you are adding a gain, k, in line with this. However, since the gain of this transfer function is negative (-6), when you sweep k from 0 to +inf, the gain actually goes from 0 to -inf. This flips the root locus to the other side. In matlab you can do rlocus(-sys) to get the positive gain root locus.
13 weeks of control systems and i didnt understand this until i watched 30 mins worth of videos. Great teacher
Yes! Good idea. I want to do a few videos on filtering building up to the Kalman filter. Thanks for the comment.
Our guy made this 10X more complicated than it needed to be. Thanks for saving me!!!
Hi Randy, thank you for the offer but you don't need to send me any money. I make a small amount of money from the ads and that's fine by me. I did post a PO Box under the "about" section on my channel page. Some people have wanted to send me t-shirts and other things to feature in an up coming video. I love getting mail and things like that are always fun. Thanks for watching.
Also, please don't ever stop drawing your cartoons during your videos!
They help take the seriousness away from the topic but equally they are a great way of conveying information in a casual and understandable way.
Cheers.
There's only one speed Douglas comes in, and that's CLUTCH!
I am into my graduate school! and this is the simplest and most lucid explanation of root locus I have found! Thanks
Such a great teacher you are!
What I could not get after attending dozens of classes, I understood in half an hour!!
Great work
Thanks a lot
Very precious, thanks a lot...The teachers at the univ do nothing but messing around. Millions of Likes man...
Brian, your videos are awesome and it really help me to grasp the basics and then go to the books.
A MATLAB tutorial on this, root locus, and on how to design a PI and a PID controller along with a plant would be very helpful.
Keep your good work.
Helpful, interesting, I'm lucky for finding this tutorial on UA-cam. Thanks a lot!
Matlab tutorial would be awesome Brian! We are truly in your debt. Thanks man.
A Matlab tutorial covering the control toolbox and SISO would be very appreciated. Thank you for all the work you've put into these videos.
You Sire, are a hero. No seriously, how are you NOT part of the Avengers team is beyond me. You're saving lives here - mine included. Thank you, wonderful lecture, so easy to grasp even for thick folks like me.
Very nice videos. First time I have seen an engineering video this good that was not from Khan Academy. Keep up the fantastic work!
This video is incredible. We need more people like you teaching at university
My actual hero, would definitely fail my control systems module without you!
Brian your videos are honestly lifesavers!!!! I can't stress enough on how great they are and how much they have helped me!!!!!!!
Still years later this guy is contributing to many many students. Thank you for your videos!
This was the most clutch video ever, week 6 into linear control theory!
I speak Spanish, but all these things are much easier for me listening to you in English than listening to my teacher in Spanish. Thank you so much!
BEFORE THIS COMPLETE BLANK ABOUT ROOT LOCUS AND WATCHING THIS FOR 30 MIN CLEARED EVERYTHING
I just want to commend and thank you on this video. Not only did it help clear up a bunch of questions I had, but the links and suggestions you provided in the description was also extremely helpful.
You are the king man, you told why we have to use PD control, just in 10 sec. !!! Yeaaahhh thanks! All hail to the Brain
Thanks mate really! At first I came here with the intention of just learning the procedure to solve the root locus! But after watching your first video I found out that it's a subject that I have to learn! your method is awesome! Now I feel it's something fun to do,rather that a pain in the a**!! THANKS AGAN.
Superb explanation -- and 15:16 onward brings it all together in a magical way. Thank you!
You probably saved so many people in your life with these awesome videos, thanks man
Man, you are AWSOME.
I think I may discovered the channel a little too late but soo intrested in videos explaining how to model systems on matlab.
Hello Raja, no the rules do not change ... however you have to be careful when dealing with roots in the RHP. The basic transfer function for a real pole is [ Wo / (s + Wo) ]. If you place a pole in the RHP then Wo would be negative which then makes the numerator negative (e.g. -5/(s-5)). This negative gain will switch the direction of the root locus to K = 0 to -infinity. So as long as you keep track of the sign and account for it the rules for the root locus are the same. Hope that helps.
Brian, Your lectures are just brilliant!
I was having a really hard time with this topic, but you have helped me so much. Please, keep doing this videos with so much dedication, you are just right.
Brian, you're the best. Thanks for putting these out, it really helped solidify my understanding of root locus plots beyond what I'm getting in class. Keep up the great stuff!
God you're a lifesaver!! Better than all those useless lectures at uni. Thanks a million!
You are saving my skin bro. I need only to pass this course to get my Computer Hardware degree. I took this course as an optional one and became totally lost. Your Video is the best explanation I could find over the internet.....and the competition isn't even close. You Rock.
Thanks for the video Brian Douglas and I would definitely appreciate a MATLAB companion video.
You sir are awesome. Half of my class was able to get through our recent control systems thanks to your videos.
Send me your address I ow you a case of beer...
Haha yeah!
Trudat
his patreon is linked in the video descirption
i never thought that root locus is so powerful, you made me realized that, thanks a lot Mr. Douglas!!
More than six years and these are still some good videos to watch
Absolutely phenomenal Brian! I've been binge watching these and they are just didactically perfect. Best regards from Brazil.
I love your videos, they make the material a lot more accessible than my textbook or professor and you really show the big picture and get me excited about learning this.
you cant imagine how your videos helped me and i will be so glad if you made the matlab video thanks alot man
Awesome, I just finished the chapter about root locus and watching this video was a awesome resume! Especially the end put everything in some context by showing actually application! Thank you so much ! Great videos!!!
Every second on your videos, your place at heaven enlarges and goes to infinity :) what a good deed
The end of this video really drove home the power of root locus to me.
Brian Douglas aka wizard. Thanks man these videos are better than my seasoned phD vet profs lectures by a mile.
Brian, this is really great work and your voice and tempo do not drive me insane like Khan Academy does.
Please do matlab controls tutorials, I would love to watch it!
Thank you for the videos.
i struggled in the 2nd video and 3rd video but when i went back to the introduction video, everything is pretty clear. thanks sir! u saved alot of students worldwide =)
Even after 10 years people are still watching this thanks a lot. Please make a Matlab tutorial.
Your videos are a huge help for getting a better understanding of control systems. Thank you for making them! I'd love to see one about the Kalman filter in the future.
I'm actually in love with you right now. I'll definitely be watching your Nyquist videos aswell! Great job guy!
Thanks so much, this video was extremely helpful! I really appreciate how clear and concise you make the topic. Much easier to follow than my professor's notes!
Write a book man! this is GOLD.
Brian, Matlab videos on control systems are always welcome :)
I never understood why i was learning this until now.Thanks Brian.I really want to get this control design well
wonderful, i wish you were my teacher !
Please Continue to posting videos, We all need you !!
@ Brain Douglas after 7 years of posting this video i am greatful to watch at this moment. Much appreciated best video regarding root locus. Kudo's to you man.
7 years, yikes! Thanks for the comment.
you can't imagine how much I've learned by watching this. thank you very much man
This is an AMAZING video series. My professor is extremely unclear and this was great prep for an upcoming exam. Thank you!
WHAT a beautiful lecture it is!!!! I'm so lucky to see this video before the exam !!! so~~~thanks !!
From now on, I am not going to class anymore. Why waste two weeks of my precious time and gas by going to class and learn absolutely nothing when I can learn two chapters in a 16 minute BD video. Merci dude
you saved me, you saved many others, thank you my good sir, THANK YOU
Hi Jon, if your university is in Hawaii (or equally exotic place) then I'm in! Thanks for the comment, and best of luck with your exam.
You're the best man. This is REALLY helpful for reviewing Control Theory.
3:20 Brian was ahead of his time
mr douglas i dont feel so good
Thomas Sowell?
Hahahaha, it took me a second to understand what you meant!
I was thinking the exact same thing looool. Caught me off guard too hahahahaha.
You know how good this video is when there is no thumb down. I wish you are my professor =D
you are a lifesaver, thank you for all vids. Matlab tutorials would be great
First off, job well done here with all three videos. Second, you should come teach my chemical engineering process control class at Oregon State University. My professor is about 1000 years old and has zero idea how to connect the physical explanation with the theoretical and mathematical concepts. You have done this brilliantly. Jokes aside, you should actually consider teaching this course...thank you so much!
Thank you for taking the time to make these videos. They are very helpful!!
Matlab tutorial will be greatly appreciated. Thanks for your amazing vidoes @Brian.
A Matlab video will be great! Thanks for the awesome videos thus far! :)
It actually doesn't matter since you can't have a root off the real line (with an imaginary component) without having a second one on the opposite side of the real line (the complex conjugate). Therefore, since they are always mirrors of each other once they leave the real line it doesn't matter which one goes up and which one goes down. In fact, if I had drawn the root locus with the same color instead of two colors you woudn't be able to tell which I drew up and which down. Hope this helps.
You probably hear this too often, but truly from my heart: thank you so much!!
My control theory teacher can learn a lot about teaching from you haha!!
If you did tutorials on how to design and analyze control systems on Matlab and Simulink that would be beyond amazing. I wish you were my control system professor I would have learned so much, but it's never to late to learn. Thank you so much for these videos.
You are absolutely amazing! I have no words. Everything now makes sense!!! Thank you, and please please keep up the insanely good work!
I love your video! Those concepts on textbook just become sooo clear, thanks!