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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Re: nope posted by CD on October 7, 2005 at 21:27:56:
"More generally your surf analogy is inapt because water is. well, liquid, and will flow past the pier to hit the shore and transfer energy there, so of course a wide pier will absorb more energy than a narrow one. That particular system has slmost nothing to do with the problem under discussion."Well, the cone tip is a relatively small object in the "sea" of the shelf and the vibration is a wave phenomenon that is occurring throughout the shelf. Most of the wave flows past the cone tip simply because it would flow past that point whether or not anything was there. We're talking about what happens at a point of interuption to the wave motion and I can assure you that all of the vibrational energy doesn't congregate and flow into that point.
So the question becomes what happens with that part of the vibration wave that does flow through the point of contact and what happens is that not all of the energy in that part of the wave flows up and into the cone. If the vibration is in the horizontal plane, most of it is going to continue to flow through the shelf and pass by right under the cone tip. If it's vertical, then more of it will pass into the cone tip and what happens if the plane of vibration is somewhere in between vertical and horizontal is that more will be transmitted to the cone than if the vibration was horizontal and less than if it was vertical. Change of direction always involves vector transmission.
And there's still the point of frequency and contact area - the size of the obstruction to the unimpeded flow of the vibration. It does have an effect - you've produced no evidence to show it doesn't.
You say that my description gets "murkier and murkier" but there are a number of factors at play and it isn't as if the cone, just because it happens to be a coupling device, is going to act as a perfect conduit and that vibration that isn't travelling in the vertical plane is going to change direction to flow up or down the cone with the same amount of energy that it was travelling in it's original direction. Forces don't work that way.
It's all very well to want a simple description of what is happening, but you can't ignore the facts of force direction and what happens when that force is channeled in a different direction, nor can you ignore vibratory behaviour in the shelf as a whole and the fact that the point of contact is a small part of the shelf area and that, at the least, you would need a contact area equivalent to the whole of the shelf area if you were to even attempt to get a total transfer of energy via an ideal coupling device. Reducing contact area effectively imposes a 'filter' on the transfer of energy and that filter is going to affect both frequency and effectiveness of transfer.
David Aiken
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Follow Ups
- Re: nope - David Aiken 00:32:40 10/08/05 (1)
- Dave, please... - Dave Kingsland 07:07:18 10/08/05 (0)
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