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Fodera Club Part XV

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#261
There's not much theory to it anymore. It's mostly figured out, I think. Here's a link to some writing by one of the world's great minds on the subject, Harold Conklin.

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Paticularly the sections on strings, and longitudinal modes of vibration. This guy is the grandfather of modern string making technology, although most string makers have never heard of him. You can look up his patents for very technologically advanced string winding machines, which are now commonplace.
 
#262
thepontif said:
There's not much theory to it anymore. It's mostly figured out, I think. Here's a link to some writing by one of the world's great minds on the subject, Harold Conklin.

Invalid Link Removed

Paticularly the sections on strings, and longitudinal modes of vibration. This guy is the grandfather of modern string making technology, although most string makers have never heard of him. You can look up his patents for very technologically advanced string winding machines, which are now commonplace.
Click to expand...

Yeah I probably should have said string vibration mechanics or string vibration physics or something else...thanks for the link.
 
#263
I'm sure there's still unknown stuff that's in a theoretical place, but yeah, most of it is just accepted mechanics by now. But a LOT of it gets overlooked in spite of that fact.

You'll enjoy reading that stuff. It really takes a certain kind of mind to figure this stuff out from scratch, you know? Just to figure out ways to test the theories... I love it.
 
#264
thepontif said:
There's not much theory to it anymore. It's mostly figured out, I think. Here's a link to some writing by one of the world's great minds on the subject, Harold Conklin.

Invalid Link Removed

Paticularly the sections on strings, and longitudinal modes of vibration. This guy is the grandfather of modern string making technology, although most string makers have never heard of him. You can look up his patents for very technologically advanced string winding machines, which are now commonplace.
Click to expand...

The longitudinal waves are analogous to the P waves (compression) in seismology. The lateral waves compare to S waves. I assume that the strings have modes of vibration similar to Rayliegh waves and Love waves, too. Especially Love waves.
 
#268
i love waves too

merkel_pipeline3.jpg
 
#270
thepontif said:
Because it's not really higher tension...it's higher stiffness. Unless you use fatter strings, in which case, the tension is higher, and the inharmonicity (non-harmonic content...thump, thud, bad harmonics) of the string goes up. So you get a significant down side with the upside. It depends on what you're trying to achieve.
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This is where the number and size of wraps around the string core becomes a very interesting part of the "elasticity" equation.
 
#273
http://en.wikipedia.org/wiki/Spherical_cow

Milk production at a dairy farm was low, so the farmer wrote to the local university, asking for help from academia. A multidisciplinary team of professors was assembled, headed by a theoretical physicist, and two weeks of intensive on-site investigation took place. The scholars then returned to the university, notebooks crammed with data, where the task of writing the report was left to the team leader. Shortly thereafter the physicist returned to the farm, saying to the farmer "I have the solution, but it only works in the case of spherical cows in a vacuum."
 
#274
Munjibunga said:
Ever notice how the string precesses in a circular pattern after you pluck it? Those are Rayliegh waves.
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Not sure about that one. I thought Rayleigh waves occur on the surface of a medium, where physical motion is circular/elliptical and the magnitude of oscillation dies out as you go perpendicular to the surface into the medium (water, earth, etc).

I would think of the string situation as two transverse modes of a string, say y (parallel to top) and z (perpendicular to the top), while x would be direction of string. You pluck in the y direction, with z unexcited; then the body of the bass starts to oscillate through forces exerted on the bridge and nut (open string); then the body oscillates coupling energy into the z transverse modes. Then the z modes do the same transferring energy back to the y modes...

FWIW,

Jim
 
#277
thepontif said:
Literally infinite? Because I'm having a hard time hearing you over that low F# you played yesterday.....
Click to expand...

^^he's funny...lol^^



You know I'm still in awe as to how these instruments haven't really changed much since the late 40s/early 50s, really right down to the pickup spacings. 60+ years, old Leo must have been quite an inventor...I mean this really defined a sound, not just a way to put together the instrument ... It's pretty amazing
 
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