What Is Robust Control? | Robust Control, Part 1

Watch the other videos in this series:
Robust Control, Part 2: Understanding Disk Margin - • Understanding Disk Mar...
Robust Control, Part 3: Disk Margins for MIMO Systems - • Disk Margins for MIMO ...
This videos covers a high-level introduction to robust control. The goal is to get you up to speed with some of the terminology and to give you a better understanding of what robust control is and how it fits into the larger control field.
A system is robust if it’s capable of meeting requirements (usually stability or performance measures) even in the presence of model or disturbance uncertainty. Basically, it’s being able to say, I don’t know my system perfectly or the environment it’s going to operate within, but I’m confident it’s going to work!
And robust control theory is how we get that confidence. It’s a method or an approach that we can use to design a system in a way that can handle uncertainty.
In this first video, we put some intuition behind these definitions.
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[@mohammadebrahiminejad8757]

NO ONE ELSE KNOWS HOW TO TEACH CONTROL ON THIS PLANET EXCEPT BRIAN DOUGLAS!
he is like the god of control professors to me.

[@joshuamitchell2275]

check out Steve Brunton

[@Ayahalom123]

Always a joy to hear brian explaining any topic!

[@BrianBDouglas]

Thanks!

[@blackboardradio343]

Thank you very much Brian that you are sharing your videos and knowledge and you are here in this world! God bless you and your family!

[@prakashgautam7229]

Brian your explanation is phenomenal.

[@rzwnhmd]

Thank you for these Tech Talk series with Brian

[@sirleelee]

Thanks Brian, will presented.

[@zitaihuang6148]

Jesus I love you Brian it's time for some robust control!

[@sugumarprabhakaran]

Great video and very intuitive explanations. Thank you!

[@coolblogger8209]

Hi your lectures are very intuitive and easy to understand. Kindly also make videos on Model Predictive Control (MPC) and Robust MPC

[@AlexandreEmanuelle]

you just opened my mind in how do we calculate things as we have complex variables included. tks buddy.

[@BrianBDouglas]

I'm glad this helped!

[@momoduduboytaylorjr.6517]

Thanks for the eye opening

[@huuthinho8406]

really informative and useful

[@radrianm5]

this is the best place to learn control engineering

[@victorcovasan9155]

Thanks Brian, we've been looking forward to a series on robust control

[@BrianBDouglas]

Thanks! I hope you enjoy it. I've finished the next 4 videos in this series and I'm really happy with how they've turned out.

[@ogunsadebenjaminadeiyin2729]

Thanks @Brian Douglas I'm looking forward to seeing the new videos.

[@faheemgulzar04]

Brian please do video on loop shaping, Hinfinity and H2 controllers

[@danawen555]

thanks!!!! very good vedio!

[@hessmanuel]

Hey Brian. Nice video. This is exactly the subject I need for my work. When will the videos for H-infinity controll be released? That would be good to know if I have to inform myself about other sources or if the videos will be released in the next few days. I would be really happy to see your videos, because they are very illustrative.

[@40NoNameFound-100-years-ago]

I hope you will include H-inf controller in the next upcoming videos 😊

[@Antonioqwert3868]

Hi, Brian your videos about control theory is great , I hope you will talk about MPC controller :)

[@leukefilmpjes9681]

7:36, how do you go from the phasemargin at a certain frequency to delay in timedomain? Thanks in advance!

[@imanplus]

Please make a video on LPV control.

[@alexanderskusnov5119]

There are cases (big gain or delay) when PID control output (u) changes fast between 0 and 100%. What if we add bounds for its speed (u-dot)? Is it a robust method?

[@tsehayenegash8394]

I have a temperure data, how can I robust this data? thank yoy

[@smozer]

Thanks Brian, really good job! Any chance to share the live script?

[@BrianBDouglas]

Sure, I just posted it to my GitHub. github.com/aerojunkie/control-tools/blob/master/classical_margins.mlx

[@smozer]

Thanks​@@BrianBDouglas

[@ogunsadebenjaminadeiyin2729]

I am an anglophone and francophone, I'd like to advocate for a French subtitle in order to make the video profitable for francophones.
Thank you for this great video @Brian Douglas

[@dimasmulyaputra5038]

Hello brian and everyone, I just learned about this topic "robust control ', can you please tell me a reference that is easy to understand about this robust control, Thanks for the great video!

[@dimasmulyaputra5038]

A Book or something about Theory and Practical, thanks

[@aldikroos6290]

In 7:35, why does 70deg of Phase margin equal to 3 second time delay?

[@ricardoolaguivel4958]

First convert the value 0.406 from rad/s to deg/s ... then divide 69.8 deg to the converted value, with that you obtain seconds, in this practically 3

[@LIVERPOOLFRANK]

Brian, any chance one day we can have some hardware in the loop lab?

[@ricardoampudia1633]

In this video he designs a real controller with hardware in the loop: ua-cam.com/video/Mbx5IMICS_Y/v-deo.html

[@Choice7890]

Can someone tell what’s the benefit of the generalized plant representation? Couldn’t find any intuitive explanations

[@blackboardradio343]

Hi, Anyone who could answer how the Pm=69.9 deg (at 0.406 rad/s) is equivalent to appr. 3 sec.
Please look at the video at 7:35.
Thank you very much for your help and support!

[@ramiveiberman3182]

Since the frequency w=0.406 rad/s we can deduce that the period T=2*pi/w=15.6 sec. Here comes the cool part. Phase margin of around 70 degrees means that the sine wave gets shifted by 70 degrees. Since each 15 sec period has 360 degrees we can reach the conclusion that delay= T*PM/360=3.02sec

[@wk961]

I often wondered how manufacturers designed controllers for mass produced goods. The answer is robust controllers.

[@kwinvdv]

I have never heard of disk margin. Is this similar to the modulus margin?

[@BrianBDouglas]

It is similar in that they are related to the shortest distance between the Nyquist curve and the -1 point, but there is more to disk margin than that (for example, you can skew the disk center. You may want to do that if you believe you have more uncertainty in one direction over another.) The next video is on Disk Margin and will explain it in more detail :) Although, I removed the section where I showed how the inverse of the disk is related to the -1 point on the Nyquist plot. So, maybe a better option would be to check out the original paper here: arxiv.org/abs/2003.04771

[@closingtheloop2593]

Brian?

[@BrianBDouglas]

Hi 👋

[@closingtheloop2593]

@@BrianBDouglas Dude you saved me in undergrad controls. How do I buy you a beer?