SUBSIM Radio Room Forums - View Single Post - Sonar experts: How much sound crosses a layer?

OKO · 11-26-05, 04:44 PM

on your link, we could see the increase of dB when increasing speed is NON LINEAR =>

http://www.fas.org/man/dod-101/navy/...s/IMG00006.GIF

What I said for a long time ... when lots of people said it was linear ...
So we can consider the increase of the dB should be not as linear as the one in actual DW (with sound fix) nor than the one of LWAMI.
it's not + 1db per knots or per 2 knots, but rather near no difference at slow speed and huge one when increasing speed
like 2dB beetween 5 and 10 knts, and 10 dB beetween 15 and 17.

I remember how peoples said DW stock wasn't good here.
We could see now, stock DW was probably more close to the real thing than the actual values .....

THIS need a real new work.

11-26-05, 04:44 PM	#14
OKO Commander Join Date: Jan 2002 Location: Solar system, mainly on earth Posts: 476 Downloads: 62 Uploads: 0	on your link, we could see the increase of dB when increasing speed is NON LINEAR => http://www.fas.org/man/dod-101/navy/...s/IMG00006.GIF What I said for a long time ... when lots of people said it was linear ... So we can consider the increase of the dB should be not as linear as the one in actual DW (with sound fix) nor than the one of LWAMI. it's not + 1db per knots or per 2 knots, but rather near no difference at slow speed and huge one when increasing speed like 2dB beetween 5 and 10 knts, and 10 dB beetween 15 and 17. I remember how peoples said DW stock wasn't good here. We could see now, stock DW was probably more close to the real thing than the actual values ..... THIS need a real new work.