Control Systems Lectures - Closed Loop Control
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This lecture discusses the differences between open loop and closed loop control. 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!
Don't forget to subscribe! Follow me on Twitter @BrianBDouglas!
List of errata in this video:
There is a missing "e" in the word change near the beginning
There is a missing "l" in the work literally in the sprinkler system example
There should be the reference signal "V" in the transfer function at the end of the lecture (this one I called out in the video).
I hate uni because most professors seem to forget that they were ever students. In two short videos you have made this concept crystal clear. It's sad that it never fails that watching TH-cam videos helps understanding better than 3 hours a week in a lecture. One more vote for YT degrees!
School is a control system... You think they're gonna actually teach you shit.. Lol
psford1 My words that first sentence.
This is just soooo true- sad but true- I came looking to find a simple well defined explanation, without Laplace crap- found it here-
totally aggree!
Totally agree. Can we just ditch the idea of going to class already and do it all from home?
The way you organize the material in a step-by-step logical manner is extraordinary ... huge talent for teaching.
Man, I like from no where arrived here, watched your videos and am thinking, WOW!!!!......so simply put and explained.. For a foreigner studying in China, and not understanding anything the lecturers are bubbling about in classes (because all lectures are in Chinese), these videos are really helping me... Peace and God bless you for the free knowledge....Please continue..and you write very good and as fast as you talk too..cool....:)
I'm posting a video right now on the Laplace Transform. However, it's a graphical approach to the transform to try to give another perspective on what it is doing and how it allows us to solve differential equations. Khan Academy has some great videos on PFE which cover the basics. As far as when to use them with Laplace transforms I'll try to touch on that in a future video.
I just want to say, I am a senior Mechanical Engineering student. I am taking Linear Controls class. I have been in that class for 7 weeks, and we apparently covered all the basics that are outlined in your videos. But every time in class, I have zero clue what is going on, I get how to do it systematically, but the purpose and meaning remained unknown. I just watched your videos and I gotta say everything makes clear sense to me, its like I have been enlightened. I just wanna give you my great thanks for taking the time to share your knowledge and teaching it in such a understandable way!
You and PatrickJMT are probably two of the leading people on TH-cam that help shape the engineers of today and tomorrow.
God bless you!
Unlike websites I've searched for explaining closed loop control, your video gives definition to "Control Loop" and "Control Theory" in a way that is easy to understand. Thank you!
One of the most interesting and understandable lecturers I've ever been lectured by, and i can listen to them over and over! Thank you very much
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3rd Year Mechanical Engineering Student here, this stuff was completely over my head at first seemed so unusual but you do an excellent job of explaining everything, but a little fast. !
i have learnt more from you in 5 minutes than i have on my whole systems and control course which i pay 10 grand a year for...... thank you for taking the time to do this.
I am an M.Sc Control Engineering student at University of Rome. The faculty includes many of the greatest scholars of the field, say Alberto Isidori, Giuseppe Oriolo, Alexadnro De Luca, etc, all of whom are very well-known worldwide. Although being a great scientist doesn't necessarily signify of good teaching skills, I think the instructor here in this video is teaching just as good as them. Best of luck to all of you.
so your profs are great scientist but not good at teaching...mr brian teach as good as them which mean he is not good at teaching either ....failed
Mohamed Magdy You are being fallacious. You need to be inculcated a little bit of logic I guess. Check this page for a start en.wikipedia.org/wiki/List_of_fallacies
Then read my propositions again.
i read your wiki page and it proved that you're wrong
Mohamed Magdy You just made one of the fallacies mentioned on that very page!
NO! You just made the fallacy of "Ignorantio Elenchi"! You established my sentence and inferred a false conclusion! I advised that being a great scientist does not mean that they are good teachers. You mistakenly deduced that I am saying: "They are not good teachers!". Actually they are good teachers, yet, being great in the field does not account for that.
Then I added "I think . . .", to show that I am aware of this fact, but I want to give you my speculation on how they teach and how this person teaches.
As a master's student of control systems, I should say that I just learned what a closed loop control system does. Thank you very much. Please Continue
i dont know if you still use this channel but I wanted to thank you from Poland Politechnika Gdańska, very good tutorial!
There should be no other way to explain this in more easier way than you have done it here. One of the best and accurately explained video. Thank you. It helped me to understand the concept once again and thoroughly.
Awesome lecture series. I'm taking a control class at Berkeley right now and these lectures are much better than my prof. Most people don't realize that you can teach at a faster pace than normal in youtube video because the listener can always pause. It keeps people from getting bored.
I like the way you present your lectures. Simple, clear and to the point.
the handwriting is so neat
the fact that these notes are so neat and pretty makes it so much more interesting to learn !
I am currently working in a plant which uses PID controllers and I have no experience with them as my past 30 years did not involve them. I am scrambling trying to catch up on this technology and this is an excellent source of information. I have gained a much truer grasp of PIDs here than from anything I have read up to now. Thanks for the help!
thanks. had to brush up my basics for an on job exam. your playlist was a lifesaver.
Thanks for your wonderful video on control theory!
For your question at the end of this video, I think it is because the sensor is not directly reading the value of y (the output value of the plant). Rather, you need to introduce another system to describe the external environment (e.g. property of the plates in the case of the dishwasher or the slopes and terrains in the case of the self-driving car), and the sensor's input is the result of the interaction between the plant's output and the environment.
If it is 1/10th as clear, it will still be roughly 100% better than my instructors rendition of how control theory works, no exaggeration, well maybe a little, maybe 98%. The sad part is that I attend a school that is ranked #5 in the US for top electrical engineering schools. Thank you very much. Subscribed!
I literally paused the video to like this video and subscribe to this channel. Excellent video. Thanks a lot. Awesome work
me too , really brother i did the same:)
Great, Brian, just wow. It would seem like a million time repeated comment right here, but I wish I could have had my professor started the course in such a clear way like you did here! Thanks, man
Learned more about control systems in this video than all the lectures and text books put together. Nice job.
These lectures are ABSOLUTELY the Best I have ever encountered on Control Systems! You are brilliant! Thank you Brian. I will defnitely purchase your book. Please add lots of real-world examples + MATLAB/SciLAB in your book.
Although you talk a bit fast, but great job and I am happy to find you at the start point of my term for Modern Control System, I hope you have covered all the topics we need. Thanks for explaining in a very professional and simple manner.
+Mohammad Dawodi You can pause the video.
You have probably heard this too many times but if you see this, damn you are a hero! Thanks for making proper mathematics videos that are available to everyone!
8:34 I think the limiting factor is the assumption of linearity (embodied in the final algebraic expression for the plant) underlying the model. There is nothing that in practice behaves in such an idealised manner so our attempt at control is limited to a range. Nice and easy to follow. Thank you.
Great first video and intro Brian. I'm no newcomer to control systems. Was often thinking about how to begin some introductory videos on the topic. Much admiration from me on your efforts. Well done, great job! 😊😊
This channel is awesome. I am going to watch every video. I am starting my master’s in Control Systems Engineering in Fall 2018, I am going to get a head start on a lot of the material with these videos. :D
how's the masters degree coming
@@TheHaloFan171 ended up getting a masters in software engineering while working full-time. I am hoping to start a PhD in statistics.
@@StonkeyKong oh man, what a turn of events, what was your undergrad in?
@@TheHaloFan171 electrical engineering, minor in physics.
@@StonkeyKong why'd you switch up from the original plan? was thinking about getting a master's in controls too
Please do! I'm studying control systems this semester in school and your videos have helped clarify the basic concepts. Your channel has definitely got the best control systems lectures I could find and I'm sure many others will agree as well so please do continue! Hoping to see some more frequent video updates too! Thanks!
Awesome, i am so glad i found all of this as it will help my Controll Systems Engineering Course. You Brian Douglas is truly awesome!
in answer to your last question at the end of the video:
I would say just by designing controller D, you can not make your plant G behave the way you want. because the plant might have some physical limitations.
if you say I want to maintain a speed of 280 km, no matter what the controller's command is, "a not very strong car" might not be able to reach this speed.
+azin ghaheri sharghi Agreed. I also suspect the following:
1. We are assuming that we have captured a perfect model of the plant when there could be errors. For the car example we might have assumed a certain input-output characteristics for the gas pedal position vs the force generated by the engine, which might not be accurate.
2. What about external uncertainties? Such as in the car example the friction of the road varying at different places, wind etc. These are things that our entire model might not have captured.
Second week into control systems and learned more in 10 mins then I have for the past two weeks. Thanks great video, I might not be dropping controls this semester
2:12 "The plant, which is the grass in this case..." Bringing literal (botanical) meaning to the technical term "plant".
There are two ways to watch this video:
1) you pay attention to what he's writing, and listen to his words in the back of your mind.
2) you pay attention to what he's saying, and look at his sketches but don't really concentrate on them, your attention being occupied by his words.
The second method of watching the video works. Not the first one. It's easier to keep listening to him, without looking at what he's writing. You can look at the screen and try to take on things from time to time, but you have to pay attention to his voice.
Hope this helps someone!
I watched this while doing the dishes and laundry and understood 70 % of it which is close to what a normal person would comprehend in an average classroom environment .
+Syed Saif I was in deep sleep while this video was playing. I only understood 80% of the lecture, something much higher that an avg attentive listener would ;)
Dheeraj Reddy 2 years old, but not necessarily, some people are more auditory learners and some are more visual learners
watched another video and still understood 90% of this vid...what the joke's dead? alright then.........
Creating two different playlists was an excellent idea. Thank you Brian, fantastic job!
I can't believe how late I found this, your channel is gold! diamond! I'm gonna be learning Control science and engineering for the next four years, and your video is truly inspiring and helpful. Knowledge is always sexy anyway
OMG this is awesome please continue the video is amazing you drawing and simple explanation is spectacular you simply said what we gave in two lectures in ten minutes
continue continue continue continue continue continue continue continue continue continue continue continue continue continue continue continue continue continue continue continue continue continue continue continue continue continue continue continue continue continue continue continue :)
Wow thanks Brian, your video helped me a lot to understand this concept.
wow I never became so interested on our subject (Control System) until I watched your video I finally can understand engineering in real life
i was confused by closed versus open loop systems in my Motor Learning class, and even though these examples have nothing to do with human movement, you've made it so clear that i can apply it to anything. some professors are a joke.
Brian THANK YOU SOOO MUCH for sharing your knowledge in this area. I have been looking for an understanding of control loops for quite a while know, and the way you explain things actually makes sense!!
Thank you so much for the video. Helps understand the mechanical engineering class I am taking, linear systems and control.
The control system class that I took a year ago finally makes sense after watching your videos. You do a much better job of explaining the concepts. Great job! Keep rolling out these awesome videos!
Your videos are great! U are genius, man! Complex theories become fun after your explanation. I am gonna download all the videos. I do not understand why professors explain these theories much complex than the theories themselves.
it is such a blessing to find this channel specially a week before ur exam,great job !
thank you so much dude, for me it's easy to understand rather than my lecturer's explanation
Thank God and to you, I found your channel and it's very useful in my study.
Hello Brian. Thanks for these videos. I am preparing for a college course on control systems. I like how you came up with the concept for the transfer function in order to look at a system as open loop.
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All the videos very helpful for my control system exams... Thank you very much...!!!
hi brian, i'm a fan of ur work here. but i'm an engineering student and our teacher tought us abt type of control sytems as natural and artificial, i would happy if do some tutorial abt other kid of classification of control systems
Trunks, thanks for the comment! I've just started the series and I plan on taking it through classical control, modern control, dynamics, sensors and actuation. Or at least as long as there is an interest on TH-cam to have me continue.
Sir your lectures are really really great, the way you tell a brief history about why different techniques where developed creates a sense of interest in this subject...and the way you break complicated concepts into simpler one is icing on the cake!!!
Hi Arsenal, I can't really number my videos because I don't post them in the order that a brand new person should watch them in. I sort of jump all around and it would take me a long time to constantly re-number them. However, I do make playlists of the various topics I cover and place the videos there in the order that people should watch them in. And I do keep those playlists up to date. Hope that helps. Cheers!
Hello Brian. Please can you recommend a textbook on Control Systems?
Great job. I was trying to improve my understanding of open and closed loop engine management in my car and now it makes perfect sense!!!
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Excellent stuff, well done! Although it is a fast delivery it is so logical you just follow the steps. However I download and watch your videos over and over until I can predict what you are about to say, that way proving my learning. I'll look out for the ones on dynamics, sensors and actuation. Thanks - I love the ones on PID - recommended
even though english is my second language i can understand this video more than 2 hours lecture at uni. Great job!!!
I love you man i took the whole course i got good grade in it by cramming but i dont learn anything other then bunch of equation how to apply laplace transforms and if you have given certain thing what to method to apply to solve the exercise problem.
Thanks for your video it really helped
thank you for sharing your talent of teaching with the world. Your contribution is enormous.
I love this! You are amazing. The logic is clear, the art is excellent. It is wonderful. I wish my videos were this good. You are my new role model.
You are the best, everything in your videos are beautiful, thank you.
Thanks Brian this is much appreciated. My Control Systems class left me with a lot of questions I'm hoping your lecture will start to answer.
Outstanding ability to introduce the material!
Thx man .. U r amazing.. for 9 yrs studying Control in Uni .. always used to hate those Subjects and the dumb doctors as well .. now 4 yrs after graduating .. Im in need to change my career from a Cisco network engineer to a control related field .. and suddenly with help of ur lectures I found out it wasnt tht bad ..lool :D .. thx man .. wishto hear from u ..blessings from Overseas ..Egypt :)
About 2 years ago, I saw this same video because I had to do a paper about PID controllers. Back them, this made no sense to me. Now since I've learned about convolution theory and LTI systems, it's really easy to understand.
Thank you for the errata list, I was looking for the missing "V" in the last "Y" equation. You're classes are very interesting, congratulations :-)
Went into the comments just for this "V" I'm not going mad it seems :)
Man, you know how to teach. Brazil thanks you.
Hi there! I am from Ukraine. My English is not fluent. But even I understand everything!!! It is awesome!!! You are genius! :-)
thanks man you clearly explained that . the best tutorial video ever !
Thank you Brian
Nice presentation, very helpfull
I permit to download this video
Amazing video, same info as my 50 minute lecture in a much more engaging and easy to understand manner. Keep it up!
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This is really amazing work....!
Now I dont need to wait for this course to be taught in my class which is next year!!
I wish my profs would teach stuff this way.....giving emphasis on the physical significance...KEEP UP THE GOOD WORK :D Hope to see more of your videos coming up!! Thanks a lot :)
thank you so much!!your video really make me understand even more about control system.
i want say some well deserved yters drop the channel due to no views but we can't blame them in 2019 actors makes more than engineer s but man if ever read my comment keep ur work and upload atleast 2mnth once ,a movie is onetime but knowledge is something incomparable
So here is when all started... A legend was born.
wow thanks a lot for this video. It was easy to follow the block diagram and the sketches on a piece of paper on the side and work through the equations. Sometimes the sketching is a little out of sync with the speech, but it's still easy to follow. Thanks again!
Thank you for your videos.They are very helpful and full of information given in a short time.You have excellent teaching skills.
Well a friend showed me this and I'm a little confused, but fascinated at the same time thumbs up.
omg, i now understand what i'm learning at the uni. the professors are absolutely tragic, no one has any idea what they are talking about... THANK YOU
Very well done sir! Hope you will continue in future..wish you all lights green
Amazing , Amazing , you don,t know how much problems you solved for me . bless you.thanks
Don't know why, but the 'plant, literally' joke cracked me up. I was thinking about the exact same thing. Anyway, good videos, your videos are super easy to follow.
Great class! You are the best teacher that I have seen!
Thanks a lot. I've been reading my lecture notes and didn't really get much info. But this video is awesome. Thank you guru.
E is the error between the input signal and the signal from the sensor. D is the controller which will convert the error from a signal lets say to a torque provided by the engine of the car. According to the torque then the vehicle (according to its inertia, wind resistance etc) will increase its actual speed (y). Note: if the error is 0, it does not mean that the actual speed of the car will be 0, as the controller instead of stoping to provide torque, will instead provide a steady torque.
thank you so much these lectures have cleared all my questions regarding my this semester course i.e. linear control system
Great video Brian! Helped me a lot! Thanks.
Your creativity made this more interesting reason why you as a teacher, did a great job.
Dear Sir, Thanks a lot for these nice videos. We learned the control system better.
Stumbled upon this with 0 background (software engineer with high school math background)
Was interested and followed up until about 7:00 where the math broke out with notationand concepts that were glossed over as "a bit of algebra"
I get that there are prerequesites but since the intro video framed this as being a sort of casual introduction giving a quick overview of math topics and\or referring to terminology\videos to lookup would be really helpful.
Why do Professors get paid so much. This man taught me more in 9 minutes than my professor did in 4 hours of lectures.
Best control system lecture
Could you please make a video on State Space representation. Really appreciate your work.I'm glad I found your channel today
Guys watch all series. Best control systems lectures on Internet.
Awesome material! I think your video are so much better than the lecture I attended. Subscribed!
Brian Dougles! Wish you were my lecturer for control theory at my university. Great video!
Great videos, short, precise and also the way you make this presentation colourful and innovative makes it easier to not lose focus. Thank you so much. You also paint nicely. :-)
Instant subscription.
Thanks for your video helped me a lot in understanding the concepts