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Yeah I hope there's more videos to come.
Maybe I posted one of these videos before but I'm doing "chaldni" testing, basically stimulating the top and back of the guitar to specific frequencies that show various modes of vibration. I really love this guitar so I'm doing a lot of testing to understand how to copy it acoustically.
The Chaldni patterns are cool. They are sort of analogogous to different waves in a pool of water. They are all happening at the same time and interacting with each other. The whole thing seems nuts to me but I'm understanding better how it reflects on actual guitars.
Couple random modes.
This sort of analysis and aid to lutherie came from guitar-and-other-instruments luthier Al Carruth, who had studied with violin-family luthier Carleen Hutchins. Al might have been the first to apply plate tuning and Chladni patterns to guitars.
You have a longer video for all of those?
yup! I think the update is that afaik Free Plate tuning which Hutchins did and maybe Carruth seems to not be super accurate in relation to the finished instrument. But they were the pioneers. I'm getting this from Giuliano Nicoletti and Trevor Gore.
People who were doing this before computers, it's pretty amazing. This stuff breaks my brain even when spoon fed. Those early people were wild. I do wonder what Carleen's violins sounded like.
No, not really. I'm still feeling the whole process out...learning a lot but I couldn't speak clearly on it as far as a lesson.
AFAIK this is what Chaldni actually did, bowed plates:
This is Giuliano, who taught me whatever it is that I know. I cued it up to his Chaldni pattern part but this is a whole video on guitar testing:
The whole phenomenon is really interesting to watch, I just wanted to see the other patterns you have on pics being formed on the video.
yeah it's sort of a PITA to do it on camera. I need to get better at the video stuff. I also ended up using way more oregano to make it look good :)
Buco this is the FFT graph of the guitar. I used the speaker at the frequency of each one of those peaks, some on the back as well, to get all the patterns. It was helpful, I was actually confusing the resonance of the back with some of the other resonances.
If you're interested, this is the doc I'm working on for myself which is sort of reverse engineering my own guitar to see if I can get pretty close to it again. It shows the progression of patterns.
Some of the patterns aren't really identifiable afaik, particularly as you get to higher frequencies. But they are clearly doing weird stuff (weird not in terms of the guitar being weird but just that the top is excited in non-predictable ways). At least...I think that's what's happening.
This is "ideal" for me, for the record. I haven't measured other instruments.