Acoustic analysis of engines

[zen_tm]

Hi there, I have been searching around for some info on the use of acoustic analysis in F1, and it seems to be black hole as far as I can see - it's mentioned quite a few times, especially in the 2006 season when revs were at their highest. [The CA2006 2.4 L V8, in the back of the *Williams* won that particular battle at 20,000RPM]

[youtube]http://www.youtube.com/watch?v=xxJ-uMLoa-4[/youtube]

I would be grateful for any info on the subject, to satisfy my curiosity.

PS: Current best theory I can find is:

Find out the pitch of the engine in hertz, and then that is the number of cylinder firings per second, divide by 8 and you have revs per second. Multiply by sixty and you have rpm. I've never done this, and I may be completely wrong, but intuitively, that's how I think it could be done.

[JohnsonsEvilTwin]

So how would Brawn know what Mercedes V10 pitch in hertz would be?

Because thats how the official line is on how Ferrari found Mercedes to be using berylium in 99.
As Ferrari’s car performance drew closer to McLaren’s, the differences in engine power between the two became starkly clear to Ross Brawn. He realised that McLaren’s Mercedes engine was able to rev as high as Ferrari’s, but with a longer piston stroke, ultimately delivering more power:

"With a longer stroke, Merecedes reaches the same revs we do. God knows how they do it"

A substantial part of the explanation for how they were doing it lay in the elastic properties of beryllium.

But how did they find out using solely acousitc analysis?

[Just_a_fan]

How did Ferrari know? Who knows.

Why was Beryllium banned? Ostensibly because of health concerns but those of a conspiratorial bent might suggest it was because of Ferrari's 'problems'...

Don't ya just love conspiracy theories...

[747heavy]

maybe start with a read here:

viewtopic.php?t=2218

and then go here:
http://www.ymec.com/hp/signal2/car1.htm
http://www.ymec.com/hp/signal2/carf4.htm
http://www.ymec.com/hp/signal2/carf1.htm

You will need to know, how many cylinders your engine has, and if it is four stroke or two stroke

.@JET
I think it was used in the heydays of F1 engine war, to "know" how high the other engines rev, and estimate engine power from rpm.
Today with the rev limit, it´s not so interesting anymore.
I don´t think they could detect the use of Beryllium by sound analysis, they could only wonder why/how the Ilmor engine could rev that high., and then maybe draw some conclusions, looking for possible answers.
As they all know what the limits of a given material are (to a reasonable level).

some other infos:
http://www.youtube.com/watch?v=oXIxVaxShBM
http://www.youtube.com/watch?v=DI949jy94eY
http://www.youtube.com/watch?v=LuTh6G0H ... re=related

[zen_tm]

Fantastic - I'll have a look through those. Thanks.

[seenathkumar]

Thanks for the videos. [...]