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Old 8th May 2008, 04:27 PM   #621
dlr is offline dlr  United States
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Quote:
Originally posted by soongsc

Prior to the cone vibration module was formally announced, I did put in a wish for one to be able to view the wave front resulting from cone vibration. Don't know whether it will get in there or not. But from the paper, it seems they are possibly looking into it.

The journey is just as valuable as the result. But we won't have anything to talk about unless you also have something to show. Well, maybe if you pickup the airfare bill...
There's nothing more on FEA worth discussing in this thread. There is no FEA available to anyone here of any relevance, none with any predictive accuracy. If you want to diverge to discuss FEA, I suggest starting another thread. There's nothing but more "if this if that" possible here. But have at it, I'll wait to see if you or anyone else provides any reliable FEA results.

Dave
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Old 8th May 2008, 04:46 PM   #622
soongsc is offline soongsc  Taiwan
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Quote:
Originally posted by dlr


There's nothing more on FEA worth discussing in this thread. There is no FEA available to anyone here of any relevance, none with any predictive accuracy. If you want to diverge to discuss FEA, I suggest starting another thread. There's nothing but more "if this if that" possible here. But have at it, I'll wait to see if you or anyone else provides any reliable FEA results.

Dave
Is this not good enough?

http://www.caelinux.com/CMS/
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Old 18th May 2008, 02:26 PM   #623
soongsc is offline soongsc  Taiwan
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Quote:
Originally posted by dlr


You missed the point in Klippel's paper altogether. Any bell mode alteration (why assume suppression, why not the more likely addition?) will be inconsequential to the acoustic output of drivers with the enabl tweak.

...
While not conclusive, it seems we have not been able to find any bell modes that stands out alone, they seem always accompanied by radial modes. Where cone breakup occurs, the bell mode is pretty much non-existent. So it seems that to some extent, the bell modes will help damp the radial modes out if they occur at very close frequencies. It would be interesting to see what would happen of the bell modes were intentionally suppressed.
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Old 9th June 2008, 03:48 AM   #624
soongsc is offline soongsc  Taiwan
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I thought I'd post this link because it seems quite in line with analysis trend, and explains a few things quite well.
http://www.kettering.edu/~drussell/D...le/Circle.html
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Old 10th June 2008, 03:26 AM   #625
soongsc is offline soongsc  Taiwan
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Quote:
Originally posted by soongsc
I thought I'd post this link because it seems quite in line with analysis trend, and explains a few things quite well.
http://www.kettering.edu/~drussell/D...le/Circle.html
The modes in a driver cone have a similar trend. The main difference is that the drum's edge is fixed, whereas the cone's edge is kind of free moving with it's connection to the surround. In the case of the cone, the combination of the bell and radial modes have the most excursion at the outer edge. What the EnABL process seems to be doing is that it breaks up the bell modes close to the outer edge, and the bell modes on the enner side of the pattern seems reduced in amplitude. If you play with the patterns right, there can abe an optimum layout, mass, stiffness combination. The number of patterns relate with the frequency range you are dealing with for a specific cone material. Current pattern seems to handle more or less in the frequency range above 10KHz.
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Old 13th June 2008, 09:10 AM   #626
soongsc is offline soongsc  Taiwan
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After looking at some more analysis, it seems that when the bell modes are reduced, the radial modes are more pronounced, and seem to occur in a lower frequency range. This could be the reason we see a change in CSD distribution with more narrow ridges similar to those measured via CLIO some one posted a while ago.

This part of the analysis using the EnABL pattern was just out of curiousitywhat we will find.
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Old 13th June 2008, 10:30 AM   #627
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by dlr


You missed the point in Klippel's paper altogether.
Any bell mode alteration (why assume suppression, why not the more likely addition?)
will be inconsequential to the acoustic output of drivers with the enabl tweak.

Dave
Hi,

Does this not imply that if cone energy can be transferred to bell
modes and disappated that way output will audibly improve as
Klippel's paper implies bell modes do not contribute to output ?

/sreten.
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Old 13th June 2008, 01:35 PM   #628
soongsc is offline soongsc  Taiwan
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Quote:
Originally posted by sreten


Hi,

Does this not imply that if cone energy can be transferred to bell
modes and disappated that way output will audibly improve as
Klippel's paper implies bell modes do not contribute to output ?

/sreten.
Actually, this is what my patent pending design does. But since this is an EnABL thread, I focus on EnABL discussion and potential.

In reality, bell modes still contribute to some output because of the shape of the cone.
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Old 23rd June 2008, 06:36 AM   #629
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G'day Daygloworange,

Were you able to arrange measurements of EnABL?

I was really keen to see what might come of this.

Cheers,

Alex
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Old 22nd January 2009, 10:53 PM   #630
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would these drivers be an example of,

a sort of enable-ing application?

note impresions in cones -

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