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Harmonics This is an amazing video that shows geometric patterns being formed by vibrating a metal plate covered with sand at different frequencies. If you turn the sound off and watch it (so the high-pitched tones don't make you crazy), it becomes like a Magical Morphing Mandala. This has nothing to do with 432hz, as different frequencies (1000hz+) are causing the patterns.
From around 0:14 to 0:18 a shape forms. The frequency forming the shape is constant. A frequency analysis of the sound (it's somewhat distorted, but I managed to get a clear picture, and I've also done a comparison with a sine-wave generator and watched/listened to the waves resonate). The frequency is 345Hz (-/+1Hz) it is by far under 400Hz.
The cross shape, formed between 0:30 and 0:34 had a rising frequency - from 485Hz to 495Hz. (432Hz skipped already, no shape was formed).
This may account for the different resonant frequencies that objects have. But, unfortunately, in the video stated there is not a single piece of evidence that 432Hz and its' resonance multiples do that to salt.
On the other hand, the whole 432Hz row (-32 cents from 440Hz)
-32 CENTS 256.835 272.107 288.287 305.429 323.591 342.832 363.220 384.816 407.699 431.942 457.627 484.838
Does have 342.832Hz, which is pretty close to the frequency in the video. The note would be F (A being 432Hz). 484.838Hz is also close to the second one - note B (A being 432Hz). So yes, the 432Hz Pitch may account for it.
On the other hand, the standard ----0---- 261.626 277.183 293.665 311.127 329.628 349.228 369.996 391.995 415.305 440.000 466.164 493.883 (0 cents from 440Hz) row, has also got 349Hz as note F (first shape) and 391 does not fall into being anywhere near any note. But again, the I'm very sure that the frequency at 0:18 was 345Hz. Needs lots of experimenting.
My bet is that neither 440, nor 432 are playing a role here, since the frequencies of both scales do not match the frequency that structured the shapes in the video. Anyone with scientific explanation for the video - please step forward.
It is the visualization of the nodes. The white places where the wave causes no motion of the plate (nodes). The black places are black because the motion of the plate bounces the salt away.
Alright.
So the rice is sitting on a surface which is connected to a frequency generator. When you see the rice "rest" in a pattern, it's just reacting to the fundamental frequency of the surface it's on, and the pattern is produced by the nodes of the waves moving through the medium. Multiple patterns are produced by the multiple harmonic fundamental. frequencies. I think that's right...
Yeah, the grains always fall into the nodes of the standing waves in the plate, which are a property of the shape and material, and are always the same for a given frequency.
t's not a doppler effect. It's resonance. The plate resonates at certain frequences, and the sugar/sand or whatever only stays in the lowest parts. As the sounds go up, more waves apear. Very good way to visualise that, must have been fun to do. The science behind it is quite easy, but it does make a good example of resonance
Cymatics, the study of wave phenomena and vibration, is a scientific methodology that demonstrates the vibratory nature of matter and the transformational nature of sound. It is sound science, and amazingly cool!
Cymatics is the study of visible sound and vibration, typically on the surface of a plate, diaphragm or membrane. Directly visualizing vibrations involves using sound to excite media often in the form of particles, pastes and liquids.
The generic term for this field of science is the study of 'modal phenomena,’ named 'Cymatics' by Hans Jenny, a Swiss medical doctor and a pioneer in this field. The word 'Cymatics' derives from the Greek 'kuma' meaning 'billow' or 'wave,' to describe the periodic effects that sound and vibration has on matter.
The apparatus employed can be simple, such as a Chladni Plate (a flat brass plate excited by a violin bow) or advanced such as the CymaScope, a laboratory instrument that makes visible the inherent geometries within sound and music.
Cymatic offers a wide range of excitation functions to attain varied timbres and textures from the physical model. The figure to the left shows Cymatic’s excitation dialogue is used to select the type of excitation, its physical properties and its position on the instrument. The dialog box shows the currently available excitation options.
Multiple excitations of different types can be applied to the same instrument e.g bowing, plucking and a live audio input at the same time. The live audio input allows the user to excite the physical model using an external sound source such as a microphone, a line in or a wave file.
Google Video Link |
Google Video Link |
Originally posted by B.Morrison
reply to post by MastaG
fair call with the point about the resonant frequencies of salt* as the medium as opposed to other mediums its an interesting argument & I'd be very interested in some evidence to support this idea if you can provide.
However I noticed in your quote it says -32 cents
For anyone who doesn't already know;
there is a more accurate figure now available...
to achieve the 8hz difference (going down the bandwidth) from 440 to 432hz is exactly 31.766653633429414cents.
Source - users.abo.fi...
P.L.U.R.I
-B.Morrison
[edit on 13/8/09 by B.Morrison]
Originally posted by B.Morrison
reply to post by MastaG
....maybe the rice isn't the picture but the gap between, maybe we've all been looking at the space around the object and not the object itself i.e. the spaces on the plate not covered by rice...i don't know if it matters..
This paper investigates the vibration response and power transmission for a thin infinite plate which is excited over a rectangular area by a uniform conphase force distribution. The use of the effective point mobility concept allows the distribution of power flow and vibration over the contact region to be determined. The distribution is found to depend on the physical and geometrical properties of the plate and the Helmholtz number (based on the width of the contact region). This demonstrates that the surface mobility of the contact region decreases with increasing frequency of excitation and increasing contact area. The effect of the shape of the contact region on the surface mobility is highlighted by comparing the results for a strip, a circular region and a rectangular region with various aspect ratios for a fixed contact area. Experimental measurements confirm the nature of the relationship between power flow and Helmholtz number for an infinite plate.