> > > > I have a 15-minute time limit -- trying to fit an informative video into > > that is kind of like explaining General Relativity with a book of haiku. >My 2cents the audio is pretty good, if you would like it to be a bit better next time, move the lav mic a bit away from your neck, more down on your shirt. Mark
Video: What is a PID Controller?
Started by ●May 4, 2016
Reply by ●May 6, 20162016-05-06
Reply by ●May 6, 20162016-05-06
piglet <erichpwagner@hotmail.com> writes:> On 04/05/2016 22:48, Tim Wescott wrote: >> Just posted a video. It's my first real effort and, as videos go, rough >> as a cob -- but I think the information is solid. >> >> I have a 15-minute time limit -- trying to fit an informative video into >> that is kind of like explaining General Relativity with a book of haiku. >> >> https://www.youtube.com/watch?v=2elEXcv0AV8 >> >> YouTube time limit >> complex subject, 15 minutes >> very hard. >> > > Thank you Tim, really nice to hear the fan working harder/softer - an > inspired choice of actuator! > > Good clear demonstration, I now can't wait to see a demo of the > effects of too much D or too much I and not enough D / I etc and then > an introduction on how to tune these or even explain how self-tuning > works.Yes! I had the same questions.> piglet--Eeyore -- Randy Yates, DSP/Embedded Firmware Developer Digital Signal Labs http://www.digitalsignallabs.com
Reply by ●May 6, 20162016-05-06
On Fri, 06 May 2016 11:02:53 +0100, piglet wrote:> On 04/05/2016 22:48, Tim Wescott wrote: >> Just posted a video. It's my first real effort and, as videos go, >> rough as a cob -- but I think the information is solid. >> >> I have a 15-minute time limit -- trying to fit an informative video >> into that is kind of like explaining General Relativity with a book of >> haiku. >> >> https://www.youtube.com/watch?v=2elEXcv0AV8 >> >> YouTube time limit complex subject, 15 minutes very hard. >> >> > Thank you Tim, really nice to hear the fan working harder/softer - an > inspired choice of actuator! > > Good clear demonstration, I now can't wait to see a demo of the effects > of too much D or too much I and not enough D / I etc and then an > introduction on how to tune these or even explain how self-tuning works.I'm not sure if I'll do self-tuning, but yes, the other two need to go into a video -- or two, to fit into YouTube's time limits. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com
Reply by ●May 6, 20162016-05-06
On Fri, 06 May 2016 08:13:15 -0700, makolber wrote:>> > I have a 15-minute time limit -- trying to fit an informative video >> > into that is kind of like explaining General Relativity with a book >> > of haiku. >> > My 2cents > > the audio is pretty good, if you would like it to be a bit better next > time, > move the lav mic a bit away from your neck, more down on your shirt. > > MarkThanks. I'll try that. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com
Reply by ●May 6, 20162016-05-06
On Thursday, May 5, 2016 at 9:48:17 AM UTC+12, Tim Wescott wrote:> Just posted a video. It's my first real effort and, as videos go, rough > as a cob -- but I think the information is solid. > > I have a 15-minute time limit -- trying to fit an informative video into > that is kind of like explaining General Relativity with a book of haiku. > > https://www.youtube.com/watch?v=2elEXcv0AV8 > > YouTube time limit > complex subject, 15 minutes > very hard. > > -- > > Tim Wescott > Wescott Design Services > http://www.wescottdesign.comNot bad. Would be good if you could demonstrate structural resonance too as the limiting factor on bandwidth. That bit is always missed in books.
Reply by ●May 6, 20162016-05-06
On Fri, 06 May 2016 14:09:34 -0700, gyansorova wrote:> On Thursday, May 5, 2016 at 9:48:17 AM UTC+12, Tim Wescott wrote: >> Just posted a video. It's my first real effort and, as videos go, >> rough as a cob -- but I think the information is solid. >> >> I have a 15-minute time limit -- trying to fit an informative video >> into that is kind of like explaining General Relativity with a book of >> haiku. >> >> https://www.youtube.com/watch?v=2elEXcv0AV8 >> >> YouTube time limit complex subject, 15 minutes very hard. >> >> -- >> >> Tim Wescott Wescott Design Services http://www.wescottdesign.com > > Not bad. Would be good if you could demonstrate structural resonance too > as the limiting factor on bandwidth. That bit is always missed in books.Much later video. In some mechanisms it's not structural resonance. Sometimes it's a pileup of grotty 1st-order poles, sometimes it's grotty nonlinearities like backlash or stiction (geared mechanisms, in particular, tend to this), sometimes it's other things -- it's always something, though, and it's usually grotty. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com
Reply by ●May 6, 20162016-05-06
On 5/4/16 4:48 PM, Tim Wescott wrote:> Just posted a video. It's my first real effort and, as videos go, rough > as a cob -- but I think the information is solid. > > I have a 15-minute time limit -- trying to fit an informative video into > that is kind of like explaining General Relativity with a book of haiku. > > https://www.youtube.com/watch?v=2elEXcv0AV8 > > YouTube time limit > complex subject, 15 minutes > very hard. >Hi Tim, Nice video, thanks for posting. I thought the controlled system was the neatest part. My suggestion is that you lead off with showing what the system can do - command a few angles, introduce a few upsets, maybe in rapid succession, and watch the system respond. Then the audience will be receptive to listen to how to achieve those results. I'm not sure how you do that with the time limit. It's a challenge. -- Best Regards, ChesterW +++ Dr Chester Wildey Founder MRRA Inc. Electronic and Optoelectronic Instruments MRI Motion, fNIRS Brain Scanners, Counterfeit and Covert Marker Detection Fort Worth, Texas, USA www.mrrainc.com wildey at mrrainc dot com
Reply by ●May 8, 20162016-05-08
On Saturday, May 7, 2016 at 11:11:43 AM UTC+12, Tim Wescott wrote:> On Fri, 06 May 2016 14:09:34 -0700, gyansorova wrote: > > > On Thursday, May 5, 2016 at 9:48:17 AM UTC+12, Tim Wescott wrote: > >> Just posted a video. It's my first real effort and, as videos go, > >> rough as a cob -- but I think the information is solid. > >> > >> I have a 15-minute time limit -- trying to fit an informative video > >> into that is kind of like explaining General Relativity with a book of > >> haiku. > >> > >> https://www.youtube.com/watch?v=2elEXcv0AV8 > >> > >> YouTube time limit complex subject, 15 minutes very hard. > >> > >> -- > >> > >> Tim Wescott Wescott Design Services http://www.wescottdesign.com > > > > Not bad. Would be good if you could demonstrate structural resonance too > > as the limiting factor on bandwidth. That bit is always missed in books. > > Much later video. > > In some mechanisms it's not structural resonance. Sometimes it's a > pileup of grotty 1st-order poles, sometimes it's grotty nonlinearities > like backlash or stiction (geared mechanisms, in particular, tend to > this), sometimes it's other things -- it's always something, though, and > it's usually grotty. > > -- > > Tim Wescott > Wescott Design Services > http://www.wescottdesign.comwell it's anything that gives you lots of phase lag. Designers should have a phase budget. Two much fiddling PID nowadays. yes they work but don't give the best. You can often fit a second integrator at low frequencies and even a second phase advance.
Reply by ●May 8, 20162016-05-08
On Sun, 08 May 2016 11:46:53 -0700, gyansorova wrote:> On Saturday, May 7, 2016 at 11:11:43 AM UTC+12, Tim Wescott wrote: >> On Fri, 06 May 2016 14:09:34 -0700, gyansorova wrote: >> >> > On Thursday, May 5, 2016 at 9:48:17 AM UTC+12, Tim Wescott wrote: >> >> Just posted a video. It's my first real effort and, as videos go, >> >> rough as a cob -- but I think the information is solid. >> >> >> >> I have a 15-minute time limit -- trying to fit an informative video >> >> into that is kind of like explaining General Relativity with a book >> >> of haiku. >> >> >> >> https://www.youtube.com/watch?v=2elEXcv0AV8 >> >> >> >> YouTube time limit complex subject, 15 minutes very hard. >> >> >> >> -- >> >> >> >> Tim Wescott Wescott Design Services http://www.wescottdesign.com >> > >> > Not bad. Would be good if you could demonstrate structural resonance >> > too as the limiting factor on bandwidth. That bit is always missed in >> > books. >> >> Much later video. >> >> In some mechanisms it's not structural resonance. Sometimes it's a >> pileup of grotty 1st-order poles, sometimes it's grotty nonlinearities >> like backlash or stiction (geared mechanisms, in particular, tend to >> this), sometimes it's other things -- it's always something, though, >> and it's usually grotty. >> >> -- >> >> Tim Wescott Wescott Design Services http://www.wescottdesign.com > > well it's anything that gives you lots of phase lag. Designers should > have a phase budget. Two much fiddling PID nowadays. yes they work but > don't give the best. You can often fit a second integrator at low > frequencies and even a second phase advance.I've worked on projects where we handed out phase budgets to the circuit guys -- of course, it was because the lead electrical guy was stuck on "it's sampling, therefore it must have an anti-alias filter", and I COULD NOT get him talked down. But at least I ended up without too too much phase lag in the system. -- Tim Wescott Control systems, embedded software and circuit design I'm looking for work! See my website if you're interested http://www.wescottdesign.com
