12-30-2015, 12:54 PM | #32327 | |
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Even having accurate dB levels won't tell the whole story, though, because the frequency spectrum also determines at least some of the quality. That is why "fart cans" are so annoying; they emphasize one frequency at the expense of everything else. The speaker industry does something very close to what you're describing, measuring dB's at a specific distance under a specific set of repeatable conditions (anechoic chamber, set power input level), etc. Frequency response is also taken. In the case of speakers, there is also the use of a Fast Fourier Transform to gain information in the time dimension, but it would not be necessary for this idea. Ideally, you'd want a standard temp (27C) for the test, but it should have minimal impact on the dB rating of a muffler! Just not in the snow, as it will MUFFLE the sound to a certain degree. I'm talking to you now, Tcoat. If you are in a quiet area, outdoors, you can probably ignore any background noise as sound decreases in intensity at the square of the distance. The volume of the muffler simply will swamp any background noise. The data could be presented as dB at a specified distance (1 meter is used a lot for loudspeakers but that won't work with a dual exhaust...) and an averaged frequency response curve. Two sets of measurements could be used; dB/freq spectrum at idle and peak dB in neutral. Several vrooms at idle could be collected and the peak volume found. You could also have an average volume at peak throttle or a set RMP (5000?). Getting all the various exhaust combinations together for measurement is the big problem. Seriously, guys, if you want to do this sort of measurement, I pretty much know exactly how it can be done. I also know about several audio-related software tools that could help capture and make sense of the data. All you would need is a laptop, the appropriate software and a calibrated microphone (and these are getting cheaper all the time). Is the goal to avoid getting pulled over by the CHiPs, or is it to have the loudest possible exhaust system?
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Last edited by babydriver; 12-30-2015 at 01:24 PM. |
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12-30-2015, 01:00 PM | #32328 | |
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12-30-2015, 01:18 PM | #32329 |
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Hmmm
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12-30-2015, 01:22 PM | #32330 | |
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You guys are way over thinking this. We are not looking at fine tuning the placement of high fidelity speakers here just a close enough reading of an exhaust. Although I can see that this project is doomed from the start I will do up MY findings and post them. I will not however, debate my methodology or results as they are what they are and I am satisfied they are as accurate as possible in a non controlled setting.
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12-30-2015, 01:26 PM | #32331 |
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That's fair, but I hope you'll state the methodology along with the results.
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12-30-2015, 01:32 PM | #32332 |
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Will provide the complete methodology but like I said will not debate it's merit or short comings. I did a lot of prep to try and find a easy method that anybody could do (with the understanding it is not controlled) since I know that everybody else does not have access to the $10K worth of test equipment I do.
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12-30-2015, 02:43 PM | #32333 |
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12-30-2015, 02:46 PM | #32334 |
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It'd be kinda hard to breathe, though.
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12-30-2015, 02:47 PM | #32335 |
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have a Store meeting in the next 45 minutes
finding out with we are closing down shop or if the company is being sold off should be interesting |
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12-30-2015, 02:48 PM | #32336 |
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12-30-2015, 02:49 PM | #32337 |
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Goodluck!
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12-30-2015, 02:50 PM | #32338 | |
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12-30-2015, 02:51 PM | #32339 |
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12-30-2015, 03:00 PM | #32340 |
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In space, no one can hear your muffler scream.
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