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Cheers for your help LvW. It would be interesting to have a play with some hardware and an unknown system. How did you come across this experience, is it just principle electronics or have you had first hand experience of PID controllers?
At first i could understand that increasing the gain...
Interesting. How would you block gain? i can understand that having variable gain in a system would be beneficial, as the best i could get was two decimal places by adding the exact GM onto the previous system.
Yes. I need to get to the limit of stability and show this on a graph for further Zeigler Nichols development. I could have shown this on a standard graph without changing the gain of the circuit (as you previously mentioned in another post-thank you). My mysterious drive for alterations to the...
Yes, both posts relate. Il start again and you can prob guess straight away whats going on. Circuit 1, no gain has been adjusted:
Circuit 1 AC image with gain margin of 7.6754dB:
Now at this point, the antilog of (7.6754dB/20) = Voltage gain of 2.419747. I am not sure where i can...
LvW,
The original low pass filter had 20dB (100k/10k) This was what i was talking about when i referred to the 20dB as you previously asked where did i get 20dB from. Since then i changed it to 241k/10k since the original GM was 7.6dB and the system had 20dB. At this point in time i have been...
Your question does not have much detail so il try and answer it for you the best i can:
1- Industrial design - JPG is just an image file, like a photo from a camera.
- colour schemes may relate to some kind of selection that you have to chose...
Re: Mechanical design QC
Most of the above techniques are quality control management strategies (Deming, Crosby and Juran etc are all leaders in quality control theories). My advice about creating quality control for a particular product would relate to statistical analysis (Histograms, Pareto...
Hi,
Right ok sorry its op-amp 2, 20dB is from the first active low pass filter (100k/10k). I do believe that my DC gain starts off at 27.4294 dB, il attach another:
I found that after implementing the GM and reaching the stability limit, the unity gain does not lie at the same frq. as my...
Hi LvW,
Cheers. I thought thats what i did, the original gain was at 20dB (op-amp 1 set this already) to obtain a GM of -7.6dB, so a total gain of 27.6dB would create stability. But with the gain at this level, i did an AC analysis to which it did not line up with 180 degrees and it had another...
Hi, after previous help from a few very helpful members on edaboard (FvM and LvW) i have now got to a point that i am finding confusing. I have a circuit:
The gain at R6 was from an inital gain of 20db which produced a gain margin of -7.6756dB as shown in the AC analysis :
So gain...
LvW
My good i cant believe i didn't spot that. Cheers LvW. After some slight alterations since you mentioned that small error (now using virtual op amps insted of 3554am- as i cant seem to get the amps to work, i have tried running the sim with power supplied to the 3554AM amp but changing the...
Hi guys thanks for your time,
The circuit represents a model of a process. R4 feeds into amp 4 output. To my knowledge this is known as the feedback loop on this system (i am aware of the feedback loops in each amp).
This circuit is part of a mechtronics module in a degree course. The purpose...
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