In case it is helpful, here are all my Control Theory videos in a single playlist ua-cam.com/play/PLxdnSsBqCrrF9KOQRB9ByfB0EUMwnLO9o.html. Please let me know what you think in the comments. You can support this channel via Patreon at www.patreon.com/christopherwlum or by clicking on the 'Thanks' button underneath the video. Thanks for watching!
I'm half way through your Control Theory playlist and I'm having a great time. I have studied this at University but never grasped some of the basics that I learned only now from your videos. Thank you very much for the huge effort you put into these videos. It surely made a difference for me.
AE511: Adjusting the magnetic strip on the whiteboard as each component is calculated was great. I liked the example at the end with finding a TF to produce a desired response at a specific frequency.
AE511: I probably should’ve seen this topic coming based off our lecture from last week and the level of detail you went into on the individual bode plots.
Hi Hassan, Thanks for the kind words, I'm glad you enjoyed the video. If you find these videos helpful, I hope you'll consider supporting the channel via Patreon at www.patreon.com/christopherwlum or via the 'Thanks' button underneath the video. Given your interest in this topic, I'd love to have you a as a Patron as I'm able to talk/interact personally with all Patrons. I can also answer any questions, provide code, notes, downloads, etc. on Patreon. Thanks for watching! -Chris
AE511: Very interesting to see how to manually determine the bode function and almost see the behind the scenes of functions in matlab that simply generate the bode plot.
Hi Nitin, Thanks for the kind words, I'm glad you enjoyed the video. If the find the these videos to be helpful, I hope you'll consider supporting the channel via Patreon at www.patreon.com/christopherwlum. Given your interest in this topic, I'd love to have you a as a Patron as I'm able to talk/interact personally with all Patrons. Thanks for watching! -Chris
Hi, Thanks for the kind words, I'm glad you enjoyed the video. If the find the these videos to be helpful, I hope you'll consider supporting the channel via Patreon at www.patreon.com/christopherwlum. Given your interest in this topic, I'd love to have you a as a Patron as I'm able to talk/interact personally with all Patrons. Thanks for watching! -Chris
AE511: Would simply applying a constant gain be a worse solution than the compensator? It seems like both would achieve the same result at the target operating frequency and magnitude.
That is not a bad idea but the thing to remember is that a constant gain adds amplification/attenuation equally across all frequencies whereas the solution we showed allows you to target where the amplification is applied to a specific range of frequencies.
AE511 - are there transfer functions that this can't be applied to? I suppose an exponential or just in general non-polynomial, but I'm not sure if those ever show up in actual transfer functions for real systems
This depends on what you call a "transfer function". In the academic sense that we've defined in this class, the transfer function is ALWAYS a ratio of polynomials as they come from a linear time invariant system. As such, this technique will always work. That being said, some engineers use the term "transfer function" to mean the dynamic input/output relation of a system. If this system is nonlinear then you can't represent it as a ratio of polynomials.
thank you for the lecture. i have one question,what if we have a transfer function from 4th grade with complexes pols 565.14/s^4+93.739*s^2+1628.9 how can we draw the bode digram in this case. thank u in advance
Absolutely, a non-minimum phase system is one where the zero breaks before the poles so the phase simply increases (or is non-minimum) before it decreases. The same rules we outline here apply to these systems.
If you have a pole with positive real part then the system is unstable and it's frequency response is undefined because the output grows exponentially, therefore there is no steady state response.
@@ChristopherLum yes that makes sense, however I have to plot bode for 4 examples from my professor's script. I would be happy to share all 4 but here is the first one: G(s) = 100 / ((s+1) (s-1)) The solutions are given aswell yet those doesn't help much with me understanding that What if the zero has negative real part? Could you bode plot then? Thank you for the quick answer :)
so I've been searching for more explanation on this topic and I've found it at onmyphd.com/?p=bode.plot apparently a RHP pole plots same as the LHP zero, but just for phase, whilist for the amplitude it doesn't matter where the pole/zero is located. Same goes for RHP zero.
In case it is helpful, here are all my Control Theory videos in a single playlist ua-cam.com/play/PLxdnSsBqCrrF9KOQRB9ByfB0EUMwnLO9o.html. Please let me know what you think in the comments. You can support this channel via Patreon at www.patreon.com/christopherwlum or by clicking on the 'Thanks' button underneath the video. Thanks for watching!
AE511: This connects all the elements that we learned from previous video very well. Thank you
I'm half way through your Control Theory playlist and I'm having a great time. I have studied this at University but never grasped some of the basics that I learned only now from your videos. Thank you very much for the huge effort you put into these videos. It surely made a difference for me.
I'm glad it was helpful. Please leave a comment on the other videos and let me know what you think. Thanks for watching!
AE511: Adjusting the magnetic strip on the whiteboard as each component is calculated was great. I liked the example at the end with finding a TF to produce a desired response at a specific frequency.
AE511: I probably should’ve seen this topic coming based off our lecture from last week and the level of detail you went into on the individual bode plots.
Wonderful. Thanks a lot for the lecture. For the first time, after watching a video lecture on the Bode plot got to know the usage of it.
I'm glad it was helpful, thanks for watching!
these days i am living with you and your fantastic videos to learn control engineering
Hi Hassan,
Thanks for the kind words, I'm glad you enjoyed the video. If you find these videos helpful, I hope you'll consider supporting the channel via Patreon at www.patreon.com/christopherwlum or via the 'Thanks' button underneath the video. Given your interest in this topic, I'd love to have you a as a Patron as I'm able to talk/interact personally with all Patrons. I can also answer any questions, provide code, notes, downloads, etc. on Patreon. Thanks for watching!
-Chris
Thanks Chris! Excellent example at the end. It helps with developing intuition.
The concrete example of implementing a control at the end was very helpful
AE 511: Thanks for the video, is helpful for building the intuition around bode plots
AE511: Very interesting to see how to manually determine the bode function and almost see the behind the scenes of functions in matlab that simply generate the bode plot.
Superb and highly informative video. Appreciating the effort taken ..thank you
Hi Nitin,
Thanks for the kind words, I'm glad you enjoyed the video. If the find the these videos to be helpful, I hope you'll consider supporting the channel via Patreon at www.patreon.com/christopherwlum. Given your interest in this topic, I'd love to have you a as a Patron as I'm able to talk/interact personally with all Patrons. Thanks for watching!
-Chris
AE511: I find it to be somewhat profound that the components can just be linearly added to create the bode plot. It's an elegant result!
Thanks so much!! Great tutorial there. At around 38:10, w should be 1 rad/s not 0 rad/s. A slight error though, everything else is okay.
Thank you for helping so much
I'm glad it was helpful thanks for watching!
great lecture !!
Hi,
Thanks for the kind words, I'm glad you enjoyed the video. If the find the these videos to be helpful, I hope you'll consider supporting the channel via Patreon at www.patreon.com/christopherwlum. Given your interest in this topic, I'd love to have you a as a Patron as I'm able to talk/interact personally with all Patrons. Thanks for watching!
-Chris
[AE 511] 31:10
The magnetic strings are creative way to change your bode plot as you solve for the individual components
Good lecture
thank for the lecture
please upload frequency response analysis video
Thanks a lot.
AE511: Would simply applying a constant gain be a worse solution than the compensator? It seems like both would achieve the same result at the target operating frequency and magnitude.
That is not a bad idea but the thing to remember is that a constant gain adds amplification/attenuation equally across all frequencies whereas the solution we showed allows you to target where the amplification is applied to a specific range of frequencies.
For the pole at the origin, the -20 dB/dec line goes through 0 dB at w = 10^0 = 1, not w = 0.
Thanks for catching this, you are absolutely correct
AE511, Thanks for this lecture!
AE511 - are there transfer functions that this can't be applied to? I suppose an exponential or just in general non-polynomial, but I'm not sure if those ever show up in actual transfer functions for real systems
This depends on what you call a "transfer function". In the academic sense that we've defined in this class, the transfer function is ALWAYS a ratio of polynomials as they come from a linear time invariant system. As such, this technique will always work. That being said, some engineers use the term "transfer function" to mean the dynamic input/output relation of a system. If this system is nonlinear then you can't represent it as a ratio of polynomials.
AE511. Thanks professor.
thank you for the lecture.
i have one question,what if we have a transfer function from 4th grade with complexes pols
565.14/s^4+93.739*s^2+1628.9
how can we draw the bode digram in this case.
thank u in advance
AE511. I going to have to watch it again starting at 41 minutes. I was a little bit lost.
Dona, let me know if something is unclear, I'm happy to provide more explanation if needed.
Hello Chris if the transfer function for example is 150 / S(S^2 +2s+9) would it be the same approach?
AE511 - that green marker doesn't show up very well on the video.
Thanks for the feedback, I will try a different color in the future
Can we plot bode plot for non minimum phase systems? If Yes, Please give me references of examples or any idea...
Absolutely, a non-minimum phase system is one where the zero breaks before the poles so the phase simply increases (or is non-minimum) before it decreases. The same rules we outline here apply to these systems.
Bode plots for complex transfer functions
i just wish someone explained this on examples when your pole or zero is not (jw+a), but (jw-a) :(
If you have a pole with positive real part then the system is unstable and it's frequency response is undefined because the output grows exponentially, therefore there is no steady state response.
@@ChristopherLum yes that makes sense, however I have to plot bode for 4 examples from my professor's script. I would be happy to share all 4 but here is the first one:
G(s) = 100 / ((s+1) (s-1))
The solutions are given aswell yet those doesn't help much with me understanding that
What if the zero has negative real part? Could you bode plot then?
Thank you for the quick answer :)
so I've been searching for more explanation on this topic and I've found it at onmyphd.com/?p=bode.plot
apparently a RHP pole plots same as the LHP zero, but just for phase, whilist for the amplitude it doesn't matter where the pole/zero is located. Same goes for RHP zero.
ae511 good lecture
AE511
AE 511
AE511