System Identification Methods

[@BrianBDouglas]

"I don't always watch KZbin videos, but when I do, I prefer Control System Lectures and funny cat videos" - The Most Interesting Man in the World

[@theKiroo]

amazing This is exactly why I'm losing fate in the school teching system...just books formulas and exams that are needed to cut the number of students... I learned more about control system in these 4 days that I've been watching you that in one semester of Control system... You sir are just inspiring

[@chronohax7186]

its 2024 and i've learned and understood more about control system and finally deciphered my lecturers' cryptic slide in just 3 days watching Brian's video

[@_pawan]

Sir Brian, only one request, don't let this channel die, keep it alive and of course you've our support ✌️👏👏

[@Postermaestro]

10:41 - 12:02 This was extremely satisfying, thanks!

[@BrianBDouglas]

Hi Daruko, thanks for the comment. Determining zeta through some white box method would be tough but it can be done. You'd have to find or develop an equation that uses the spring parameters like material type, number of loops, radius of the loop, etc in order to calculate it. Realistically though you'd just test for it (similar to how we found the spring constant). More often than not developing a model takes both methods - writing equations and testing for the parameter values.

[@samfisherXXI]

I don't know how to thank you man, God bless you, if only all our teachers were like you....

[@Cuculosaitu]

Wow, one of the most useful videos I've seen on KZbin. Thanks!

[@mohabsoliman7172]

you know, your videos have helped me alot during my study in universty, and now i'm graduated and I have an interview tommorow in MBD which I got a very good understanding forming the big picture and working out the details with your illustrations, and if I am accepted and started my career, it will be thanks to you. So I just wanted to say how grateful I'm and wish you all the success and happiness.

[@chrisferrell2663]

My God where were you when I was in college? Could have saved me tons of headache. Oh, that's right...KZbin didn't exist yet.

[@selvasair]

12:09 The crux of the experiment, perfect explanation for in phase and out of phase response

[@Sebastian0x7BF]

Why, oh why I did not meet such teacher when I was in school... So simply and graphically - in a word, great job!

[@BrianBDouglas]

Hi Glen, well you understood what I said correctly ... unfortunately what I said was wrong! I did mean to say that the vertical axis was the imaginary axis not the real axis. I've added an annotation to correct it plus I wrote it in the Errata section of the video description. Thanks for pointing that out :)

[@johntrauger68]

Hi Brian, I'm not really sure how I got here but I'm damned glad I did. I'm an old school industrial electrician/ converted to I&E tech (not voluntarily) in the 90's. So much of this are things I've had to learn on my own on the down hill slide to retirement. I currently teach motor control at a tech school, something I'm very comfortable with. But these control methods are something I had to wrap my head around through books and other co-workers. I think you are going to be a great help for me in my current configuration.... I'll definitely contribute to your efforts, keep up the great work. John T

[@samirmartins]

Hi Brian, your videos are amazing.... I'm a PhD student from Brazil and I've been working with Multiobjective System Identification techniques I watched your videos about PID control, root locus and bode plots... all of them are great! Thx for these videos! Congrats!

[@adamstybrzynski3216]

Suddenly, after entire studies of aerospace engineering, thanks to Your excellent teaching, Bode plots made sense to me. I'm so impressed in how all those things about roots and plots come together and help us build accurate models! WOW

[@juliabraga3587]

No words to describe this channel, simply awesome!

[@SamWalsh1]

You are pretty much single handedly going to get me through my control systems exam - Something I thought was boring as hell before I started watching your videos.. now I eagerly check youtube for your next vid.. Please keep going, One day who knows we could all end up building a mars rover together..

[@francesconigri745]

dear Brian, I'm astonished by your engineering skills ... Great

[@AJ-fo3hp]

Thank you System Identification Spring Linear and non linear region identification Spring constant K = N/m Simulation problem find y(t) Control system problem find u(t) System Identification find S Methods of System ID Black box find S based on sine sweep or step input or bump test White box find S based on mathematics (Soring constant, force = ma) missing here is damping factor, how to find damping factor?) Finally testing on real spring and mass. Such a wonderful explanation Thank you

[@rationalthinker9612]

That demonstration was mind blowing. The universe truly is written in math, the universal language.

[@TIGRETONICO]

Your best video, by a long shot, and that is saying something.

[@ventreste]

Wow, sir, your demonstration of the real life application of the Bode plot made so many concepts in my head combine into one big picture I could almost hear the clicking sound.

[@kademmohammed6836]

Man you have no idea how much help you've done to me and my friends, #respect from #Algeria , thank you so much

[@Francisssssssss]

That's simply brilliant. I wish I had had these videos during my lectures, life would have been lot easier :)

[@QuentinMayo]

Best System Identifications videos online

[@osmayd]

That's great teaching. Way better than some university profs. Congrats!

[@Joseph9401al]

I enjoyed a lot how you use physical experiments to illustrate control theory. So amazing

[@bowmanzz1]

You are the Richard Feynman of Controls Engineering...well done, sir.

[@thedorantor]

It's so amazing that the bode and pole-zero plot are nothing more than an other point of view of the complex laplace domain. Beautiful to see the connection.

[@ugoamaldi8056]

Your videos are incredible and your channel is awesome. Very good job.

[@BrianBDouglas]

Hi Eduardo, I apologize but I don't think I follow your question. I don't think what I did is a competitor to LSM. To me LSM is used for estimating oversampled signals (for example trying to curve fit a noisy measurement). I used LSM to get a bet fit linear line of the data. Also, when you're doing the black box method you can use LSM to determine the best coefficients for the transfer function that you're estimating. If I'm way off your question could you please state it differently? Thanks!

[@marvincepulido3532]

THIS IS AWESOME

[@sultanyerumbayev1408]

Final proof that my professor actually sucks at teaching is that he sliced this video lecture and put it on his lecture slide and launched video from this channel. P.S: The bes channel about control theory!

[@emanuelefumeo5762]

In Italy I experienced the same situation that I recognized in other comments. If only my Control Systems professor could explain the concepts in this visual way... Thank you Brian!

[@mbabaeevideos]

Thanks Brian. I love the way you present your lectures. I wish you were my control system course teacher at university.

[@blessoneasovarghese9834]

Amazing experiment ! We all have seen such actions of spring in our daily lives. But analyzing its behavior in terms of Bode was something great and innovative that even professors fail to do. I am keen to watch similar videos in near future.

[@BrianBDouglas]

Ha! That's the best question yet :) It's from an online comic strip called XKCD, but I bought the shirt from thinkgeek. Man, KZbin won't let me write dot com, they're on to me!

[@Burmzie]

Wow... the demo at the end really tied things together for me. Thank you Brian. Will you make anymore videos?

[@Parirash123]

Wow I'm watching this after 10 years and it's so intuitive. By the way, where is Brian Douglas these days ?

[@BrianBDouglas]

I'm around still! I post to the MATLAB channel now. You can find everything I make at engineeringmedia.com. Cheers!

[@dkdatiger]

I really like this type of video where I can actually see and relate equations and concepts to what you talked about in the previous videos!

[@hegde.prashant]

Thanks Brian! you are a gifted teacher :) and on top of that you understand the subject matter so well.. these videos have been immensely helpful

[@bartomiejburda3127]

I just was sitting with open mouth during this video...excellent explanation !

[@dobkhnistheking]

oh screw Dos equis!!! you sir are most interesting man in the world! I cant wait till the next vid. U have inspired me into control systems and so far i have gotten all A's in my control class... i'm thinking of getting a masters degree in control systems ... actually i already applied for that!

[@Amine-gz7gq]

I really liked the experiment you did and the explanations you gave.

[@mohammadalshawabkeh5791]

Best physical interpretation ever! The natural frequency experiment is awesome. Thanks Mr. 💐

[@bo-shianchen5712]

It's the best practical way I've ever seen to describe the Bode magnitude and phase plot! Thanks, Brian.

[@nuridincersaygili]

a clear introduction to system identification

[@mahmedaa]

Man, this is a great video. I've been watching and following your channel for some time now and I've found it excellent but this one just compelled me to write a thank you comment. It's just that great :) Thanks and I wish you all the best. Have a nice day. Ahmed

[@Maarrk]

Just wanted to tell you that this is still very useful and well made content, have a great year!

[@broslymech]

Finally I get to know why do we always use Step input to check all systems in all problems we study :)

[@akhilkumarp2578]

Why...can u explain it to me

[@blue3783]

High quality video. Good job.

[@ffff-r7p]

this is just the best! Really appreciate all your videos, may the universe in turn help you and your family forever!

[@kommolafe]

Great work Mr. Brian Douglas!!! Thank you!

[@UlyssesLizarraga]

Superb Brian.

[@syedtirmizi2769]

there are actually three: 1) White box 2) Grey Box 3) Black Box i am also in your fb page. Syed Hamza Ali I loved the way you explained bode plots, and with hand spring.

[@PasanJayaweeraYashoda]

It's nice to see the face behind my control lectures after all these weeks!!

[@migueldiazcabrera]

Great content Brian

[@AlanMedina314]

Wow, You Brought it all together Awesome Job.

[@AbdulrahmanMajash]

Great job. I'm just wondering though, how would you go about determining zeta using the white box method to get a more realistic bode plot?

[@hugotorresr1643]

Great Lectures!!! Nice Experiment!!! Cool shirt!!!

[@ricardoi8171]

Man... you're good. Very good.

[@adambruce1688]

Your explanation of the material you actually cover (which I would call modelling with some testing to do parameter identification) is superb. However, none of what you discuss in this video is system Id as it's typically thought of. Would love to see you do a dedicated lecture series on the detailed math behind response measurements, RLS, Kalman filtering for online parameter estimation, etc.

[@efox29]

As always, brilliant.

[@thingsalongtheway]

Awesome example to use Brian! The system gain plot matches transmissibility curves I learned in mechanical vibration classes. I love it when different theories link up!

[@salmanfazlerabby6252]

Best explanation ever......

[@MHegazi]

A question Mr. Douglas In ur opinion, what is the best book for Control theory for beginners ?

[@余杰-h7f]

your video is really awesome, helping a lot for people confused by obscure textbook knowledge. wish know you sooner!

[@clementegarcia3665]

Excellent job Brian, I just found your videos, great job, congratulations!

[@NikolaosPapadakis]

Around 7:15, you are writing down equation of a spring as F= 94N/m* x, however I would expect an offset there(from the graph about 10N). Would that affect the analysis further down?

[@cam3oh]

Visual inspection would give as you said. In context at to the verbal discussion, x in the equation refers to the linear region. It would be inferred that the "zero point" is the minimum displacement for linearity, say 10cm.

[@sidneykantor]

Your videos are fantastic! Thank you!

[@bene0237]

Please make more!!! You are amazing :)

[@АндрейВитт-ф6г]

Excellent video !

[@mdjesan6435]

awesome ...thanks for giving a practical example

[@antonioanthonio6295]

dude you are the best!

[@mpendulokona7477]

Best explanation ever thanks so much. Looking forward to your book on control theory !!

[@feliperoque18]

Amazing explanation about this such important topic. I was wondering if you have any videos about Matlab Ident Toolbox?

[@geb257]

Brian, loving the videos, very thorough yet still accessible.As a fellow control engineer I'm interested in the sorts of projects/applications to which you've been able to apply the theory that you've covered in you're series so far?

[@digiajay]

Hi Mr. Douglas, Do you know any online portal which provides the control system courses? Or is there any distant learning courses as I'm sitting in India and would like to learn this control systems. I have been searching for such courses but not found any. If no such thing exists, why don't you initiate the control system course something in Coursera or Udemy?

[@BrianBDouglas]

Ulysses ... I think I have beard envy.

[@mauricio2866]

Very good video! Thanks!

[@OlmoTomasMezger]

Thank you so much for this courses. I'm an engineer and need to identify a system and make a control for it. I hoping for more on this topic! Thanks.

[@Howard0064]

What a good explain! Thanks!

[@kotbegemot819]

Awesome explanations! Thank you so much. I'd like to throw in my five cents on obtaining the harmonic oscillator equations. I think it's not the most transparent way to do it. Technically, in the F.B.D. there are only two forces acting upon the mass both in stationary case and in motion: Gravity and Spring Tension Fs(x2,x1). Reducing this to a single force k(x2-x1) (which equals to zero at steady-state with x1=0) is done my choosing the coordinate system so its origin coincides with the resting center of mass.

[@chnaumanzahid7381]

I have similar idea in my head. But i think if we analyze the stationary case, the tension in the spring us equal to the weight downwards. And the other upward force is caused by the input when it starts oscillating.

[@flaviusone]

Amazing job, keep it up sir!

[@marcofunes7535]

You're the best! Thanks for your videos.

[@7555George]

I pressed Like because of the great explanatory video (and definitely not because of the xkcd t-shirt, no, it barely affected my judgement at all).

[@nimeshsingh9271]

Yep, one does indeed learn more by watching practical demonstrations than simply reading them in the books. Thank you for taking your time out and creating these videos ! Been helpful to me for understanding and appreciating the subject ❤.

[@jsbc003]

Awesome videos! Thank you for your effort!

[@misharedtalon]

Thank you so much, I've cleared out a lot of daubts from watching your videos. I yet have more to learn on system identification, particularly graphic Identification, refference model, varosimilitud maximum and instrumental variable. If you have any more videos on this topic it would be really helpful, thank you again.

[@freedom_is_responsibility]

Thank you for the good work

[@PrabhDeepProduction]

You sir are the man!

[@denniscraggs8393]

Nice explanation. Question, what hardware and software do you use to create the presentation?

[@eassis2]

Hi Brian, fantastic job. I am interested in learning more about system identification, what literatures do you recommend to start with? Thanks Edgard

[@mucahidcandan]

Hello Mr. Douglas What is the name of program that you use for writing on black board. I have been wondering this for a long moment :) I wanna use the same tool in my school work.

[@ike3467]

very explanatory 👍

[@senthilkumaranms]

is there a video for identifying the system with system response data for step input?

[@EduardoFelipePossato]

Hi Brian, great job with the videos man, congratulations. I am currently working with identification algorithms and I was wondering, what are the advantages of using this method over the Least Square Method, for example (that is the method I'm using).

[@belisariogonzalez7793]

You're amazing!

[@AnikChaudhuri]

excellent video.

[@johnblack4]

Hello brian, Your videos have really made a big difference by helping me get through the control subjects in chem engg! Please could you put up a video for cascade control, GM & PM settings! :) Really appreciate the effort you put into the videos. Cheers,