Passivity-Based Control to Guarantee Stability | Control Systems in Practice

[@francesconigri745]

the more I watch your videos, the more I improve. You are very talented, Brian

[@MATLAB]

Happy to hear that! Yes, Brian Douglas is awesome!

[@francesconigri745]

@@MATLAB the good thing is that you always have an answer ... Thank you so much for that

[@danstiurca7963]

You are doing a great service to the engineering community with these excellent videos. These are definitely interesting ideas beyond the standard control system approaches. Thank you. :)

[@francesconigri745]

Amazing lesson. You, guy, are fantastic ..

[@MATLAB]

Thanks, Brian Douglas created this video. Look for other videos he made in this channel.

[@divyabhatia9916]

Very nice explanations. Thanks.

[@alonspinner4838]

How can you ensure passivity in a real system if it holds some non-negligible transport delay? From my understanding, there is no way the Nyquist plot won't dip into the left half-plane.

[@alexanderskusnov5119]

You should decrease the gain.

[@BrianBDouglas]

Hi Alon, I responded to this a couple days ago with a link to an example with delay but it looks like KZbin blocked it. So, if you Google "Passive Control with Communication Delays" you'll find a MATLAB example that shows you how to deal with some transport delays. I hope that helps!

[@alonspinner4838]

Thanks for the answer. I found your article which was great 👍

[@sandmaster4444]

Can you post the resource links!?

[@Pedritox0953]

Wonderful video !!

[@jochenillerhausji]

The promised link seams to be missing... also thanks for the nice summery

[@makkanelectronics]

Great work✌👍

[@francesconigri745]

dear Brian, matlab shows error at line 61: unrecognized function or variable CL0 ...

[@BrianBDouglas]

Hi @francesconigri, line 61 is defining the variable CL0 so it shouldn't exist until that line. It's weird that the error is that it is an unrecognized function or variable CL0. Do you have a typo that is trying to reference CL0 instead of define it? Are you running the example from MathWorks? This one: nl.mathworks.com/help/control/ug/vibration-control-in-flexible-beam.html

[@francesconigri745]

@@BrianBDouglas Thanks, Brian, for answering back. I'll give a look at the example and try to run matlab once again. I'll let you know.

[@BrianBDouglas]

@@francesconigri745 Great! If it doesn't work, I'll try to help you out. Good luck!

[@francesconigri745]

@@BrianBDouglas Thanks, Brian. Everything looked much clearer in the example you suggested. At the present, I only need practice.

[@oldcowbb]

so basically energy in Lyapunov sense?

[@elburgos666]

Seems like it according to Wikipedia. I guess "passivity" means a strictly stable system (all poles in LHP). For a controller, that would mean no integral action. A controller with no integral action would be useless for regulating systems, unable to compensate por peristent disturbances. So I guess no I in a PID.

[@melakuhaile1461]

thank you for this excellent explanation. Excuse me, please help me about optimization and modelling

[@nyquist_control]

so... what is my system is not passive?

[@elael2]

Great video! The sad part is that in the real world stability isn't enough. We have to make sure the controller/controlled system will respect the limits of the components.