I'm really enjoying these videos. I didn't have a childhood or schools or parents unfortunately and then once I survived that nightmare I injured my spine and now I'm disabled. But the fact I didn't get to enjoy school has left me with lots to do now I need like eighteen hours bedrest a blummin day. Awful as all that is, I have the perfect thing to do in bed here. Learn and learn and learn! It makes the days seem worthwhile and my time seem wisely spent..... I watch from many sources and at many levels, but I'm particularly enjoying these videos. I'd been on quantum physics for ages and thought I needed to do standard physics so here I am. Thank you for doing these videos. They have so much more value to people than you can know......
As usual, a brilliant presentation. One can use a violin bow to excite the sheet and putting a finger at a particular position will show different modes of oscillations. Also cutting different shapes and cutting a slot or two in similar sheets will show stress points for various modes of oscillations where in some craft as planes and other machines one tries to avoid thse modes of oscillations because of fatigue and failure. Well done, so much work behind all these demonstrations. It needs a dedication man as this gentleman.
Here I was trying to make a heavy solenoid respond at audio frequency’s. Meanwhile you just hot glued some Styrofoam to an old speaker. Nice work! You should be able to cut away a lot of the speaker paper if you want it quieter and don't mind destroying a speaker. Better yet start with a torn speaker. I didn't think the speaker would be strong enough to vibrate the plate.
Great project, Bruce. These are what is called "standing waves", by the way. The driver launches the wave into the plate at the center. The wave travels radially outward and reflects back in off the free edges. If the edges are held fixed, then different patterns will form. The waves reflect in a different phase - 180 degrees (instead of in phase when the edges are free). If you could hold the edges with just the right damping "load" these patterns wouldn't form because there would be no reflected wave. ... This is related to how holograms are made and these standing waves happen in bodies of water (high school wave tanks show this), in rooms (you can move around a room and hear a constant tone come and go) and along radio transmitter transmission lines. You could have students do this in the classroom! Pick a tone with a wavelength of a few feet; below 1kHz to start. ... I just gotta' spend more time watching your videos for these really good demo ideas, Bruce. Thanks for your creativity and efforts. -- Cheers, ScienceAdvisorSteve P.S. I'd call the speaker a 'driver' rather than 'oscillator'. The signal generator is called an oscillator, or at least is has an oscillator circuit in it.. An oscillator is an electronic circuit that generates a repetitive signal.
I suppose the patterns and shapes depend not only on the frequency but also on the characteristics of the plate (shape, elasticity, material and so on). Is that the case?
TranscendentalTones Yes. You've got the idea. A simpler example to start with is a guitar string. It can vibrate "naturally" at frequencies which are a multiple of the lowest. The lowest would be called the fundamental. The higher ones are most correctly called overtones (when talking about a vibrating thing), but the frequencies are called 'harmonics'. ... Look at the first image here: en.wikipedia.org/wiki/Guitar_harmonics This shows how a string can vibrate. The most motion is where the lines "bend out". Where the lines cross in places between the ends, there is no movement. ... For the plate, visualize this happening left-right across the plate as well as up-down. ... For the string, the ends are held fixed, but the edges of the plate are free to move and usually do. The sand collects where there is the least movement - at the points where the string doesn't move which is shown by the cross. ... Make the plate stiffer, and patterns happen at higher frequencies; like a tighter string. Make the plate heavier, and patterns happen at lower frequencies; like the thicker strings. . This is showing what is called "resonance". The plate/string resonates (vibrates easily) at these frequencies. ... Finally, another way to look at physical resonance like this is as waves traveling through the plate. Think water waves traveling across water. However, when there is the end of the plate, the waves reflect and bounce back. When this happens. the waves traveling in opposite directions cause the type of vibration you see on teh string. These are called "Standing Waves" because they stay in fixed positions. You can't see the two waves moving along in different directions. This may seem strange for two moving waves to look stationary, but that's what happens. -- Cheers, ScienceAdvisorSteve Challenger.org
Do you think that if you drilled the hole with higher precission (in the perfect centre of geometry of the plate), it would make much more symmetrical patterns? It looked really nice on the record which has to have the hole perfectly in the centre, but it looked much worse with the square plate
can an exciter be used to create a chladni plate? ive seen videos where they make pretty great loud speakers and watching this makes me wonder if its possible
Hi Bruce, could you connect directly from your computer (or phone) to the speaker? How necessary is the amplifier? I don't really understand how you're connecting the amplifier to the speaker via the 4 metal posts.
I'm a music teacher whose favorite subject all through school was science. What if I simply put a suitable plastic container on the speaker on my keyboard? I can definitely feel some vibration coming from the 2 speakers, but if it is insufficient, suppose I plug my keyboard into my roughly 2.5' high amplifier (don't recall its wattage at the moment), lay the amp on its back, and place the sand box on the cloth surface? I also have a microphone that I use with the amp and could go that route with the online tone generator when my keyboard's range ends on the high C (4096Hz).
the tone generator I used tops out around 20,000 hertz. as I progress to the higher frequencies, the patterns became more complex and and finer. eventually the pattern becomes fine enough that the plates can't show it
Hi, I'm trying to make something similar. But I want to cut out the annoying sound somehow. I was thinking to cover it with transparant plexi glass so you can still watch through it. You think it would work? Or any other solutions to reduce the annoying volume while maintaining those clean patterns?
Bruce how do u feel about A=432 hz- A=440hz and how they resonate with the plates? Does it produce better results when the plate is tuned to one of those particular freq? Im trying to find out if 432hz really is a better tuning. Acapella is usually around 432hz. Im looking at bird song also although its quite tricky.
It's been a while but I found that each plate behaved a differently, depending on the size shape and thickness, even it it was slightly warped, the plates were never tuned, but I think that would be an excellent idea. At the moment I can't judge whether 432 or 440 would be better, once again I think the shape would make that distinction.
Bruce I appreciate the reply. I write/compose music and as u know the last year has raised a lot of questions. One is the A= 432hz. I had my piano tuned to this and yeah its fine. But I just cannot find definite answers or proof to whether this is a better tuning (more in tune with nature) to use and whether i should start recording to this tuning. If the ancients did indeed tune to 432 or round abouts id be inclined to trust them. La rouche from the schiller institute campaigned for it to be changed to 432. Rudolf Steiner believed C=128 hz and others but the theory often gets labeled with the 'Flat Earth Theory' Jamie Burtoff research points towards 432 hz . Im wondering if every individual has their own unique freq I.E. such as each resonate plate. Acappella for me comes out at about 435hz. My guitar sounds nicer at 432hz Im also wondering does any of it matter? Id love to see some research from your end. Maybe a video u could do? Thanks for repying Bruce.
Hello Luigi, thank you, I'm not sure about the thickness, they were cut out of the sheet metal covering on a broken heater. I've tried a few thicknesses in the past and found to have success with ones that I could bend and flex by hand. The frequency range started around 100 and gave me good result up to around 2000 hertz.
This explains how the Egyptians were able to move massive stones using sound vibration. If you can manipulate sand to reposition beneath a stone, you have yourself a lever.
Incorrect. No electricity, no amplifier, the amplitude required to move anything large would require both and destroy ear drums. The pyramids were built with old fashioned muscle, ramparts, and log rollers.
pretty cool. These are actually related to the solution of the wave equation in a plate. Hence, the pattern will depend of the shape of the domain, the frequency of excitation and the boundary condition i.e. the way the edges of the plates are supported. currently you have them free. but you could have something like restricted displacement but free rotation (kinda like the slinky). Thanks for the video
they are not all the same thickness, I've also used ones out of different materials, some are steel some are aluminum. If you are looking to try it in plastic, I would start with 1/16 of an inch
Hi Bruce! Thank you for this video, very helpful information! I just wanted to ask, do you think a regular speaker would work, without the styrofoam? Just set it underneath the plate and voila? 🙏
Hello Juan, yes there are better quality metal plates that will give more defined patterns. I was trying to show how to perform it using some homemade equipment
hello, I was wondering if I could have your permission to use your footage in a video I am creating for a battle of the brains competition. we are making an exhibit on vibrations for the science city museum in Kansas city, and we would like to use this as one of the examples in our video to display the effect vibrations can have on sand
Hi Matt, Yes, you may use, if you go back in my videos, I posted a video on vibrating sand demonstrating buoyancy if that is helpful you can use that one also
I want to understand the theory and mathematics behind the patterns themselves. can anyone help me by giving the right source to read? Thanks in advance
if you need a frequency generator, check hgrinc.com. They are right down the street from me and sell all kinds of industrial surplus. Its all used and mostly outdated, but i bet they have tons of stuff you would like or could use for classroom experiments. Check em out!
I'm really enjoying these videos. I didn't have a childhood or schools or parents unfortunately and then once I survived that nightmare I injured my spine and now I'm disabled. But the fact I didn't get to enjoy school has left me with lots to do now I need like eighteen hours bedrest a blummin day. Awful as all that is, I have the perfect thing to do in bed here. Learn and learn and learn! It makes the days seem worthwhile and my time seem wisely spent..... I watch from many sources and at many levels, but I'm particularly enjoying these videos. I'd been on quantum physics for ages and thought I needed to do standard physics so here I am. Thank you for doing these videos. They have so much more value to people than you can know......
Thank you! Finally someone with an understanding on how to make a video tutorial.
As usual, a brilliant presentation. One can use a violin bow to excite the sheet and putting a finger at a particular position will show different modes of oscillations. Also cutting different shapes and cutting a slot or two in similar sheets will show stress points for various modes of oscillations where in some craft as planes and other machines one tries to avoid thse modes of oscillations because of fatigue and failure.
Well done, so much work behind all these demonstrations. It needs a dedication man as this gentleman.
This is one of the best channel I have recently found. great work keep it up
GREAT VIDEO!! I loved how you used different shaped plates
Here I was trying to make a heavy solenoid respond at audio frequency’s. Meanwhile you just hot glued some Styrofoam to an old speaker. Nice work!
You should be able to cut away a lot of the speaker paper if you want it quieter and don't mind destroying a speaker. Better yet start with a torn speaker.
I didn't think the speaker would be strong enough to vibrate the plate.
Great project, Bruce. These are what is called "standing waves", by the way. The driver launches the wave into the plate at the center. The wave travels radially outward and reflects back in off the free edges. If the edges are held fixed, then different patterns will form. The waves reflect in a different phase - 180 degrees (instead of in phase when the edges are free). If you could hold the edges with just the right damping "load" these patterns wouldn't form because there would be no reflected wave.
...
This is related to how holograms are made and these standing waves happen in bodies of water (high school wave tanks show this), in rooms (you can move around a room and hear a constant tone come and go) and along radio transmitter transmission lines. You could have students do this in the classroom! Pick a tone with a wavelength of a few feet; below 1kHz to start.
...
I just gotta' spend more time watching your videos for these really good demo ideas, Bruce. Thanks for your creativity and efforts.
--
Cheers, ScienceAdvisorSteve
P.S. I'd call the speaker a 'driver' rather than 'oscillator'. The signal generator is called an oscillator, or at least is has an oscillator circuit in it.. An oscillator is an electronic circuit that generates a repetitive signal.
I suppose the patterns and shapes depend not only on the frequency but also on the characteristics of the plate (shape, elasticity, material and so on). Is that the case?
TranscendentalTones Yes. You've got the idea. A simpler example to start with is a guitar string. It can vibrate "naturally" at frequencies which are a multiple of the lowest. The lowest would be called the fundamental. The higher ones are most correctly called overtones (when talking about a vibrating thing), but the frequencies are called 'harmonics'.
...
Look at the first image here: en.wikipedia.org/wiki/Guitar_harmonics
This shows how a string can vibrate. The most motion is where the lines "bend out". Where the lines cross in places between the ends, there is no movement.
...
For the plate, visualize this happening left-right across the plate as well as up-down.
...
For the string, the ends are held fixed, but the edges of the plate are free to move and usually do. The sand collects where there is the least movement - at the points where the string doesn't move which is shown by the cross.
...
Make the plate stiffer, and patterns happen at higher frequencies; like a tighter string. Make the plate heavier, and patterns happen at lower frequencies; like the thicker strings.
.
This is showing what is called "resonance". The plate/string resonates (vibrates easily) at these frequencies.
...
Finally, another way to look at physical resonance like this is as waves traveling through the plate. Think water waves traveling across water. However, when there is the end of the plate, the waves reflect and bounce back. When this happens. the waves traveling in opposite directions cause the type of vibration you see on teh string. These are called "Standing Waves" because they stay in fixed positions. You can't see the two waves moving along in different directions. This may seem strange for two moving waves to look stationary, but that's what happens.
--
Cheers, ScienceAdvisorSteve
Challenger.org
One of the best I've seen! thanks a lots ;)
Do you think that if you drilled the hole with higher precission (in the perfect centre of geometry of the plate), it would make much more symmetrical patterns? It looked really nice on the record which has to have the hole perfectly in the centre, but it looked much worse with the square plate
What a great Teacher, I would love being in your class.
great video and as always - very resourceful.
Thank you for making this video! I haven't made the driver yet (I'd like to), but I made the garbage bag + bucket chladni plate from another video.
can an exciter be used to create a chladni plate? ive seen videos where they make pretty great loud speakers and watching this makes me wonder if its possible
Hi Bruce, could you connect directly from your computer (or phone) to the speaker? How necessary is the amplifier? I don't really understand how you're connecting the amplifier to the speaker via the 4 metal posts.
the computer or phone doesn't have enough to power to drive these speakers, you really need an amplifier like for a stereo system
I'm a music teacher whose favorite subject all through school was science.
What if I simply put a suitable plastic container on the speaker on my keyboard? I can definitely feel some vibration coming from the 2 speakers, but if it is insufficient, suppose I plug my keyboard into my roughly 2.5' high amplifier (don't recall its wattage at the moment), lay the amp on its back, and place the sand box on the cloth surface? I also have a microphone that I use with the amp and could go that route with the online tone generator when my keyboard's range ends on the high C (4096Hz).
I'd say give it a try, start at a much lower range and work your way up
Did you try? What were your resultas? I was thinking to do something like u.
you just can't dislike this guy! :D
accually 11 people can.
the noise can be removed if you cut out the cone and only leave the dust cap and voice coil in place.
Do you think it would be possible to put water in a vacuum chamber and push sound through it to get 3D shapes?
So, how music affect molecular arrangement in our cells ????
To you recall the wattage and size of the speaker you used ?
could you find the shape of the aum frequency?
That was lovely! Thanks! :)
I think it would be a nice idea to make some kind of boundary on the disc so you dont have to keep pouring sand repeatedly
What about the frequencies we cant hear? That's the frequency they use to navigate:)
the tone generator I used tops out around 20,000 hertz. as I progress to the higher frequencies, the patterns became more complex and and finer. eventually the pattern becomes fine enough that the plates can't show it
Hi, I'm trying to make something similar. But I want to cut out the annoying sound somehow. I was thinking to cover it with transparant plexi glass so you can still watch through it. You think it would work? Or any other solutions to reduce the annoying volume while maintaining those clean patterns?
cut as much of the speaker cone away as possible helps reduce the sound. your good idea of covering it with plexiglass should help also,
Very clever, thank you!
You can cut part of the cone off the speaker to make it quieter.
Awesome. Gonna try this.
Have you tried using using rice on your cymatic driver plate?... preferably uncooked.
Bruce how do u feel about A=432 hz- A=440hz and how they resonate with the plates? Does it produce better results when the plate is tuned to one of those particular freq? Im trying to find out if 432hz really is a better tuning. Acapella is usually around 432hz. Im looking at bird song also although its quite tricky.
It's been a while but I found that each plate behaved a differently, depending on the size shape and thickness, even it it was slightly warped, the plates were never tuned, but I think that would be an excellent idea. At the moment I can't judge whether 432 or 440 would be better, once again I think the shape would make that distinction.
Bruce I appreciate the reply. I write/compose music and as u know the last year has raised a lot of questions. One is the A= 432hz. I had my piano tuned to this and yeah its fine. But I just cannot find definite answers or proof to whether this is a better tuning (more in tune with nature) to use and whether i should start recording to this tuning. If the ancients did indeed tune to 432 or round abouts id be inclined to trust them. La rouche from the schiller institute campaigned for it to be changed to 432. Rudolf Steiner believed C=128 hz and others but the theory often gets labeled with the 'Flat Earth Theory' Jamie Burtoff research points towards 432 hz . Im wondering if every individual has their own unique freq I.E. such as each resonate plate. Acappella for me comes out at about 435hz. My guitar sounds nicer at 432hz Im also wondering does any of it matter? Id love to see some research from your end. Maybe a video u could do? Thanks for repying Bruce.
HI Bruce. Great job! Just an information: Wich are plate’s tickness and frequency range used in your demonstration.
Tks
Hello Luigi, thank you, I'm not sure about the thickness, they were cut out of the sheet metal covering on a broken heater. I've tried a few thicknesses in the past and found to have success with ones that I could bend and flex by hand. The frequency range started around 100 and gave me good result up to around 2000 hertz.
Can you connect this to a piano keyboard?
This explains how the Egyptians were able to move massive stones using sound vibration. If you can manipulate sand to reposition beneath a stone, you have yourself a lever.
Incorrect. No electricity, no amplifier, the amplitude required to move anything large would require both and destroy ear drums. The pyramids were built with old fashioned muscle, ramparts, and log rollers.
@@nickj1111981 You don’t need electricity. You can move sand an a drum with your voice. Google or YT it.
Hey Bruce!, good video!
Do you know, if sound waves are able to disturb the magnetic field lines ?
Thanks!
Hi Anonimousxz, I wouldn't think so
pretty cool. These are actually related to the solution of the wave equation in a plate. Hence, the pattern will depend of the shape of the domain, the frequency of excitation and the boundary condition i.e. the way the edges of the plates are supported. currently you have them free. but you could have something like restricted displacement but free rotation (kinda like the slinky). Thanks for the video
thanks Felix, I'm planning some new plates for this to see what else I can get
Sir , plzz tell me the thickness of the plastic sheet we can use instead of a music record or metal sheet.
they are not all the same thickness, I've also used ones out of different materials, some are steel some are aluminum. If you are looking to try it in plastic, I would start with 1/16 of an inch
Now uhm this video is almost 3 years old but I have one question
Why did you put the speaker in a canister with paper?
How about if i use a 2mm thick acyrllic sheet, will it vibrate upto that frequency..
that should work, it will be a matter of finding the best frequency
@@YeanyScience Thx sir..
next we need an oscillator, *AND THATS GONNA HOLD OUR METAL PLATES*
LOL, I know, my editing needs some help
Well done.
Hi Bruce! Thank you for this video, very helpful information! I just wanted to ask, do you think a regular speaker would work, without the styrofoam? Just set it underneath the plate and voila? 🙏
it's possible but you'd have to turn the volume up really high
@@YeanyScience Okay, thank you very much!
This one made my day, really awesome!
At which frequency can you set the grains of sand to "Homemade science with Bruce Yeany"? lolol
I should check, it is about time that I get a new introduction
can this be used to form more complex pattern?
Hello Juan, yes there are better quality metal plates that will give more defined patterns. I was trying to show how to perform it using some homemade equipment
Can i resonate it at 30 000 hz?
I doubt your speaker can even play 30khz
hello, I was wondering if I could have your permission to use your footage in a video I am creating for a battle of the brains competition. we are making an exhibit on vibrations for the science city museum in Kansas city, and we would like to use this as one of the examples in our video to display the effect vibrations can have on sand
Hi Matt, Yes, you may use, if you go back in my videos, I posted a video on vibrating sand demonstrating buoyancy if that is helpful you can use that one also
Bruce Yeany thank you very much!
I want to understand the theory and mathematics behind the patterns themselves. can anyone help me by giving the right source to read?
Thanks in advance
I would suggest starting with a internet search for the words "Chladni patterns" there is quite a few sites that offer information on them
Thank you!
What is the name of the ball that he used please comment early there is an exhibition to be planned
Disc
it was a polystyrene foam ball that I cut in half and then glued to the speaker
Couldn't you cut around the speaker so that it's quieter?
HI Daffy, I could probably cut sections out and that help
would a bluetooth speaker have enough power ?
Bruce Yeany The Science Gene
How loud actually is this without editing?
loud enough to be really annoying but not dangerously loud
+Bruce Yeany (Yeany Science) like 70 decibels? Or maybe 40
I'd say between 70 and 80
Just a thought, could you cut holes in the speaker cone so that it still oscillates normally, put doesn't push as much air?
HOLY MOLY!!!! Dont wear headphones......
Great
feel cold quantun mechanics?
if you need a frequency generator, check hgrinc.com. They are right down the street from me and sell all kinds of industrial surplus. Its all used and mostly outdated, but i bet they have tons of stuff you would like or could use for classroom experiments. Check em out!
Way awesome!!??
Ear rape at 0:20
Is that Christian Prince??