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Agreed, this is definitely a new concept and I hope it works.
The only thing that bothers me is that, as you pointed out, the bandwidth needed for attenuation is about 0 to 12 Khz. That represents MANY octaves even if we bump the lower limit to a realistic number ( only a closed pipe will work at zero :-). This bandwidth is mutually exclusive with the term "tuned". And if by tuned they mean low pass, then it is not a new concept since that is covered by conventional mufflers. There may be something to this new concept but until this contradiction is explained, I would hesitate to start cutting parts.
Tracy
On Tue, Jan 6, 2009 at 12:59 PM, Ernest Christley <echristley@nc.rr.com> wrote:
Tracy Crook wrote:
Interesting stuff Ernest, Hope this turns up some good results.
I haven't had time to really go into muffler theory so I've just observed what the car & motorcycle makers do. Based on these observations only, I've concluded that unless we come up with a new concept, there is no substitute for size and cubic inches.
Even still, conceptually it's a fairly simple construct. The devilish part, as Bill alluded to, is that it has to be tuned. The papers I've read lead me to believe that I have some idea of the magnitude of the dimensions necessary, and I've sketched out a way to run a lot of tests of different configurations easily. Nothin' left to do but the doin'. 8*)
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