Hey Brian! Just wanted to say your videos are helping a whole class of electrical control systems students in Oslo understand what the heck we're doing. Our professor has actually listed your youtube-channel as alternative curriculum since, quote, "Brian Douglas explains it at lot better than I ever could". Good work! And thanks!
@johnnyBrwn
8 жыл бұрын
+Lars Martin Jensvoll Wow, you must have really humble professors. My EE controls professor is a haughty MIT graduate and he'd never think that someone was better at instructing controls than him. It's a shame too because he's taught me in such a pedantic way that enforces nothing but rote memory. So much so that I literally didn't know the difference between a close loop or open loop system or what stability was until I started watching these videos. I made it all the way to senior year not learning anything practical about controls. I kind of feel embarrassed that I paid dozens of thousands of dollars to go to a "highly ranked school" when Brian Douglas has taught me more in less time for free :-/
@footballfan3991
4 жыл бұрын
@@johnnyBrwni feel bad for u bro, but atleast u hopefully got it at the end :)
@javidfarhan1675
3 жыл бұрын
My professor did this too !
@slehar
7 жыл бұрын
Amateur mathematician, retired programmer, WOW this stuff is really interesting! Thank you so much for making it available! You have a talent for making everything clear! By focusing on the graphical! Thank you! Great stuff!
@Lemonickous
10 жыл бұрын
Your explanation is so lucid yet deep! Prof. Feynman would be proud! Thank you very much for this series.
@BrianBDouglas
12 жыл бұрын
Hi Blackhole, I use Adobe Photoshop with a black background and draw on it using a Wacom Bamboo tablet. I capture the screen using a built in function in Quicktime, edit the video in iMovie, and do the voice over in garageband. The last three programs were all standard on my iMac. I copied the style of the videos from Kahn Academy, which I think is a fantastic online source of free educational videos. Thanks for watching.
@Skybagel1
4 жыл бұрын
Seems like teachers really like you and your content, my teacher for online school has pointed us to your videos a few times already
@srinikethr4198
9 жыл бұрын
hi Brian, can you make videos for Lyapunov , non linear systems and state space method
@zakiryne
11 жыл бұрын
Brian, I should say, one of the best lecture series I watched on control systems. God bless you for helping us understanding difficult things in a very effective way. Now I dont need to go through the books. Great!
@Howshallwesay
11 жыл бұрын
Many aircraft types display this stability by having either a high wing, so the centre of gravity is below and acts like a pendulum, or a low wing with dihedral which tends to make the plane fly wings level when there is no control input and to recover from a disturbance. This is also why the tailplane and fin are called "stabilizers" I love your videos and am learning all the time as I associate your ideas with other experiences encouraging me to go deeper into this subject, thanks very much.
@faraza8868
3 жыл бұрын
My Dynamic systems and controls teacher explains things so confusing. I understood this 11min video in the time I couldn't understand him in 1 hr.
@blah148
9 жыл бұрын
these videos are amazing!!
@sad2750
9 жыл бұрын
Your videos are short, but hugely satisfied with the explanation.
@lionellye1337
8 жыл бұрын
A silly idea that only works on metal ball: Place electromagnet as an actuator on the top of the mountain to return the ball to its original position. Still use radar as sensors. :) Nice video as always!
@larimus724
2 жыл бұрын
Great idea! And if the ball is magnetic you could also use induction sensors that registers if the ball creates a current by its motion. Just taking up on your idea ;) Nice videos, Brian! The're really awesome! Helps me alot for my control theory exams at the end of the week :)
@nimaparsa2686
4 жыл бұрын
The explanations regarding the stability was simple and accurate. Great job!
@ramjikolappanv6693
7 жыл бұрын
In the beginning i felt control systems was somewhat difficult and none explained with a proper example. This video was very much useful. Thank you sir. I was searching for videos like this. 👌
@gateINdream
5 ай бұрын
Sensor - strain guage Actuators - that ball is connected to two motors placed at each bottom sides with a Rope whenever the ball is falling that opposite side motor will start and get the ball back to stable position
@khushdeepsinghmann6515
8 жыл бұрын
Hey ! Your lectures are too good for an beginner in the Control Theory. I would like to answer the question that you mentioned at the last in this video. I think that actuators/ sensors have individual transfer functions and we should theoretically model our system ,then consider various control techniques for finding the extent of stability of that system. Once we have done these analysis then we can actually think of whether the transfer functions of actuators/sensors considered were correct or not (as per our requirement). Please comment about my analogy. Cheers !!
@varunn.a.5764
10 жыл бұрын
Excellent job Brian.......U R the teacher of the future........:-)
@SanQae
11 жыл бұрын
You're better than most of my teachers
@guttulamanohar8668
9 жыл бұрын
A nice Brief lecture on flight stability and controls
@BWCmike
11 жыл бұрын
I hope you cover Root locus drawing (if you havent already). I've always had a hard time with that.
@renandebritoleme3097
4 жыл бұрын
Great class! You are the best teacher that I have seen!
@ashishmodi13
10 жыл бұрын
Thank you so much Brian. You have explained in a simple language.
@saviozz22
12 жыл бұрын
Very interesting, infinitely better than my lecturer.
@benjamintan9979
9 жыл бұрын
Hi Brian, do you by any chance do videos for State Space Equations (and their stability analysis), BIBO Stability and Lynapunov stability, etc?
@tourniquet84
11 жыл бұрын
I would place my "hill" on a stage that can tilt in all possible directions and cover the "hill" with a very dense set of electrodes to preform capacitative sensing of the position of the ball. I would feed the signal into my controller and output a signal to control a hydraulic lifts to reduce the error term. There would have to be many lifts to have a great deal stability.
@xueyanzhu9785
7 жыл бұрын
OMG, this example is amazing! Thank you so much for making everything so lively!!~
@lucasmmteles
8 жыл бұрын
amazing! continue the good work! u are bringing good free kwnoledge to the world! thanks a lot!
@engr.israrkhan
4 жыл бұрын
Best control system lecture
@jatinderpalsingh2356
10 жыл бұрын
I think if we consider it in terms of two way feedback system with one at sending end (Generation) and second at Receiving end (Distribution) but missing part here is transmission system so take reference when ball is at zero position in centre of crest then it will shift either way sensor at both ends and one at centre to measure if there is any disturbance in the position of ball the feedback system acts between the three sensors then we can bring the system in its stable position more accurately the fans at both ends response to feedback from center and either end on which side ball is moving after disturbance.
@JordanEdmundsEECS
6 жыл бұрын
Excellent video. I don't mean to be pedantic, but for BIBO stability you need to ensure that the impulse response not only goes to zero, but goes to zero fast enough (its energy is finite). Granted for linear systems this distinction won't matter, but math D:
@grpagobo
4 жыл бұрын
Thanks Brian, great help.
@asifmahfuz4564
10 жыл бұрын
Hello Brian!! Your videos are really helpful and helps us to visualize the whole thing. I have almost seen all of your videos in KZitem by now. I wanted to know if you could make a video on state space control and explain on the controllability and observability of a system, which still to me is a bit unclear. Thank you.
@BrianBDouglas
11 жыл бұрын
Thanks for the comment Satish. If you go to my KZitem Channel home page (just click on my name) and then click on playlists they are in the correct order there. If you want to see the correct order for all of the videos then click on the playlist for all lecture videos. Otherwise if you're interested in just a particular topic I have playlists for that as well.
@SumitDebnath-dc2xg
6 жыл бұрын
practical explanation.now i can relate my theory course with practical phenomena. great u r sir. thanks a lot.
@daydreamer0606
12 жыл бұрын
Your videos are great, if you could do a tutorial in the future on frequency filters and their transfer function that would perfect.
@squeakyice-cream441
10 жыл бұрын
build gps and motors into the ball? that'd be potentially expensive electromagnet at the top of the hill with a pressure pad, with the ball made of or coated in iron, when the ball leaves the pressure pad the magnet turns on and draws the ball back? Would require lots of fine tuning. only 2 ideas i could come up with on short notice that other people may not have said
@MultiNova100
11 жыл бұрын
Can't wait for the signal processing series! :-D luv ya
@devn0n
3 жыл бұрын
This is a beautiful video, thank you soo soo much!!!
@mertkrgx6107
Жыл бұрын
I use camera for obtain ball location and I move platform as actuator.
@muralidharan6594
3 жыл бұрын
I will use linear actuator's and image processing :)
@tahakhan1064
8 жыл бұрын
on both left and right id put a conveyor belt (both moving towards the equilibrium position) this would only activate if the sensors are triggered though.
@shivanshtripathi7627
Жыл бұрын
I would use Hall Sensors assuming that the ball I use is magnetic in nature and I would have electromagnet as actuators that would either attract or repel that ball
@KarinaRodriguez-yv7mf
6 жыл бұрын
Hi, I was a little confused on why shooting a dart backward produces an unstable system... The motion of the dart is the same (except its flipped) to the stable system
@priyankaarora8503
4 жыл бұрын
if an impulse input produces constant output, will the system be considered stable? thanks
@abram_saleh
8 жыл бұрын
Great videos! i really appreciate your work
@chanakyasinha8046
4 жыл бұрын
How about building electrostatic charge so that ball will always be attractive towards top of curve, and be repelled by any deviation caused when getiing closer to instability, making the system as a capacitor..
@sholay706
11 жыл бұрын
Hello Brian, I am really enjoying your videos so far. Will you be making future videos on Digital Control systems (z transforms ) or Hybrid systems. Also do you have videos on mason rule?
@sirajuddinsarfaras689
2 жыл бұрын
hi,can you make a video on difference between uniformly stable and sisl system
@vijaybahadur6941
8 жыл бұрын
Really its good approach
@swapneshjoseph8653
11 жыл бұрын
Hey Brian... Excellent videos... Im enjoying them... would it be possible for you to do one on Lyapunov stability... Im having a hard time with that...
@AnujAgrawal08
11 жыл бұрын
What's the software you use to produce these videos? I really like the interface and its functionality.
@abhisheksingh-li6zo
7 жыл бұрын
what is difference between probabilistic model vs control theoretical model
@vivekpokharkar9344
11 жыл бұрын
Thank you , it Help me to understand stability!
@SafeAndEffectiveTheySaid
8 жыл бұрын
Well done!
@marofe
9 жыл бұрын
very nice!
@raghavsingh3764
6 жыл бұрын
I would use a camera as sensor, image processing tool as controller and an accelerating hill as plant
@allesolution6409
4 жыл бұрын
Sir can we use a camera tracking system for the ball on the mountain😄
@md.jafrulhassan5727
Жыл бұрын
Thanks a lot
@ronbrooks3387
11 ай бұрын
Why is phase margin important?
@yashcastiel
7 жыл бұрын
I would use a gyroscope around under the ball
@mhd-2870
8 жыл бұрын
Thanks man
@Edu888777
4 жыл бұрын
I would use a system of weights with a balance engine inside the bol.
@1337CodeMaster
7 жыл бұрын
A gyroscope inside the ball and an little motor with a weight. Now we have BB-8 :D
@NXTangl
4 жыл бұрын
If our goal is always the very top of the mountain, then my actuators and sensors will be the intermolecular forces of a bit of glue. However, for a more general sense, I would likely be designing the ball itself to navigate, so probably GPS and an internal weight.
@shubhambora6758
6 жыл бұрын
Sir, can you make videos on Modern Control Theory please???
@paul1964uk
11 жыл бұрын
Wouldn't the radar gun detect motion (speed) rather than 'location' (position or displacement) and isn't doing that almost as good for the purposes of the thought experiment here?
@electromotivated
10 жыл бұрын
The set point is a measurement of 'position' (at the top of the hill), so we need to actually look at the positional output. Given that we know the initial position of the ball we can integrate the output of the 'speed' measurement to obtain the position of the ball as it moves
@browneyedham
10 жыл бұрын
yes, you can integrate velocity to obtain displacement.
@junweima
10 жыл бұрын
If we are only limited with PID controller, then chances are very limited number of actuators can be used.
@valmormn
6 жыл бұрын
God bless you dude!
@Azurexth
11 жыл бұрын
how come a smart engineer like you can draw such cute drawings...
@danawen555
4 жыл бұрын
thanks!!!!!
@yonghust9674
7 жыл бұрын
It's great!
@freddy88nor
11 жыл бұрын
Hi, I love your videos, really helped me so far. Could you cover MIMO systems? (multiple input, multiple output) I am taking a course in Multivariable and Nonlinear Methods. =)
@panduwilantara3070
Жыл бұрын
good
@MrWandalen
7 жыл бұрын
cool!
@bissketng213
7 жыл бұрын
this video make me more clever again
@Pocketgod2
4 жыл бұрын
I would glue the ball to the top
@IftikharAhmed-ic1lu
7 жыл бұрын
👍
@qwerty-mz8is
10 жыл бұрын
electromagnets, and have the ball be made of metal
@Avalanchanime
3 жыл бұрын
System, actuator, computer? I'll just crank one of the ends of a bungee elastic fiber to the ball and other to the top of the mountain xD
@Avalanchanime
3 жыл бұрын
Or maybe three bungee fiber anchored to the mountain and at one point of the ball
@pritish01234
3 жыл бұрын
@@Avalanchanime But then the ball wont return to the center unless you have a hypothetical bungee... but still, creative comment 👍
@Avalanchanime
3 жыл бұрын
@@pritish01234 hehe, ty
@sk10200x
5 жыл бұрын
Someone explain me the Dart Concept!
@sarathkk4848
3 жыл бұрын
The center of mass of a body in motion should be in line to the path of motion to attain stability. If the darts is not aligned in position to the direction of its motion, the center of mass of dart will be out of its trajectory of motion. Then the feathers at the rear end of the dart is designed to create pressure with air incident on the feathers. If the dart is aligned to the trajectory of motion, then all the feathers will be having equal pressure and the position is maintained. If the dart is misaligned to the trajectory of motion, then one of the feathers will cause more pressure on the dart due to more air resistance and push the dart back to its position i.e center of pressure and center of mass aligned to the trajectory of motion which is the stable position for the dart.
@jihadsamarji
5 жыл бұрын
I will rotate the whole Mountain if it's a globe as an actuator, and use a Camera to track the ball.
@Johansorell
7 жыл бұрын
i would use a human to hold the ball
@brandon-eg5iu
8 жыл бұрын
bruuuuuh im so confused....
@Deepakkumar-tq1xv
7 жыл бұрын
better stand on with your friend and pass the ball..... left to right... right to left... or what about super glue
@nomoreheroes93
10 жыл бұрын
I think Khan must have disliked this because you stole his colour scheme
@nathikdiaries
10 жыл бұрын
Khan wouldn't care even he copied the lecture frame to frame, because to khan it is not about who gets credit, it it about if the student understood. Same goes brian douglas, which is why they make it free and put so much passion into it that most professors who get paid to do teach can't match them.
@Mith02
7 жыл бұрын
Sir please speaking slowly because in some vidio u speaking fast
@onclick9787
9 жыл бұрын
why r u in so hurry ..... ur lectures r good but poroblem is that u r writtng , speaking , drawing evrything simultaneously ... those vibrant colours n unnecessary cartoon drawing ...these things just alter my concentration ...bcoz we hv to listen u also what r u speaking ....and as a non english person i hv to take care ur accent too ...... hope u r getting my point
@longalexislong
9 жыл бұрын
ricky rann Please note that there is an option to slow down videos if they are too fast, and there is nothing to stop you from pressing the 'j' key a couple times to skip back over parts you weren't paying attention to. For me at least the drawings, diagrams and differing colours help me to remember points that he's talking about.
@eecakir
7 жыл бұрын
I was watching 2x.
@theanupamkumarYT
8 жыл бұрын
What my professor couldn't explain in hours, you explained in minutes. You are amazing sir!
@manoharp6800
4 жыл бұрын
Hours also made from minutes so your sir.. also.. Explain in minutes.. 😎😎😇
@jamienash5263
8 жыл бұрын
I would use a magnetic ball or add a magnetic core to the ball and then use magnets for actuation and triangulation to locate the ball.
@gershoma5538
8 жыл бұрын
his artistic talent never ceases to amaze :')
@mmm222ish
6 жыл бұрын
first of all this is extremely helpful , thank you very much secondly, i wound use a curved up (positive slope) slides that would convert the unstable system into a stable one like the example of stable system, and that is triggered by a sensor when the ball comes near it
@BrianBDouglas
12 жыл бұрын
Hello Naze, thanks for the comment. I'm working on a stability theme right now but I like your suggestion. In the near future I'll put out a series on signal processing and cover topics like high and low pass filters, band pass, butterworth filters, Kalman filters etc.
@BrianBDouglas
11 жыл бұрын
I have one video this week and one next week to finish a few backgroup topics first. The third video this year will begin Root locus drawing. Stayed tuned!
@eniyavanrameshbabu1977
3 жыл бұрын
Hi Brian the lecture series is very nice and i was going through it you concluded that too stable system will be rigid but when system is too stable then the time constant will be small so the response will be faster so how can it be unresponsive .Could you please let me know ur thoughts
@SaurabhRautIR
8 жыл бұрын
Which software did you use to make this demonstration?
@mohamadhallab2282
2 жыл бұрын
him: explaining stability me: such fascinating drawing skills!
@raysa5887
8 жыл бұрын
this lecture is Pleasurable your explanation and your drawing let person enjoy learning keep going...
@EngineeringSimplified
2 жыл бұрын
The ball example was great to explain the stability of a system and how to make an inherently unstable system stable. Love your videos!
@OaklandMann
11 жыл бұрын
Bro, these videos are absolutely amazing. I am excited to see your coverage of modern control theory (nonlinear)
@wissalzaher4868
3 жыл бұрын
As a student in Germany your videos are helping to a degree that I can't even express at this point. Seriously, you are the best. I thank you to the moon and back :)
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