Timeline for Remap FFT frequency bin distribution
Current License: CC BY-SA 2.5
9 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Mar 28, 2011 at 16:38 | vote | accept | Davido | ||
| Mar 17, 2011 at 18:48 | comment | added | Davido | Currently there is no model, I'm working on developing a model. I would like to set up a method where I can correlate rock types to specific frequency distribution patterns and see if I can manage to get some repeatable results for specific hardnesses/porosity of rock types. I was thinking it might be kind of similar to voice recognition algorithms, but the rock response while breaking it is the voice I would be using as input. Any ideas? | |
| Mar 11, 2011 at 7:22 | comment | added | Zen Harper | ...if, on the other hand, there is no good model available, you could try using a statistical approach: collect masses and masses of data and try to get a computer to find patterns/correlations in the data. But I don't know how likely this is to succeed. | |
| Mar 11, 2011 at 6:40 | comment | added | Zen Harper | ...I suppose what I'm trying to say is that the uncertainties/errors/unknowns in your model and/or data sound like they could be far greater than anything arising from mathematical analysis of the data, so it's not worth worrying too much about the mathematical details until you have a better physical understanding. | |
| Mar 11, 2011 at 6:36 | comment | added | Zen Harper | OK, thanks for explaining the background to the problem. But, unless you have a detailed physical model relating properties of the rock to properties of the Fourier transform, I don't see how this is a mathematical question. Suppose you had the exact Fourier transform available; how would you use that to make your decisions? Are you planning to try to judge by eye from the frequency graph? Does the same type of rock always give a similar frequency distribution? Otherwise, the FFT is not likely to be useful. | |
| Mar 11, 2011 at 0:31 | answer | added | dranxo | timeline score: 1 | |
| Mar 9, 2011 at 15:39 | comment | added | Davido | I'm designing a program that will allow me to listen to a drilling tool as it is breaking through solid rock and monitor the frequency spectrum of the rock response through an accelerometer. I'm trying to be able to identify different rock types/properties based on frequency content while drilling. | |
| Mar 8, 2011 at 4:55 | comment | added | Zen Harper | It sounds to me like you're using FFT as a black box without regard to its intended application; I would guess (but I'm not an expert) that what you want to do is either very difficult or meaningless. If you explain clearly what you want to use your FFT for, it might help: note that there are many other types of data representation, and the FFT is not always the most suitable one to use. The choice of solution is strongly dependent on your intended application. | |
| Mar 7, 2011 at 18:46 | history | asked | Davido | CC BY-SA 2.5 |