SUBSIM: The Web's #1 resource for all submarine & naval simulations since 1997 |
03-31-20, 11:52 AM | #1 |
Loader
Join Date: Jan 2008
Location: West Point
Posts: 87
Downloads: 1280
Uploads: 0
|
why no rebound sound ?
hi, captians! I'm always confused when i play the Silent Hunter 3 and Silent Hunter 4, that is when you are at periscope depth, then an escort is pinging your sub,why you and your crew could not hear the ASDIC ping rebound sound when the escort found your sub. As far as i could remember, when i played the old Silent Hunter Commander's Edition, you really could hear a sonar rebound sound when the tin can caught you, which is a good warning of losing your stealth. So which situation indeed is historically accurate ?
__________________
Lieutenant George W. Bush |
03-31-20, 01:10 PM | #2 |
Eternal Patrol
|
If you had Asdic/Sonar it would echo the original signal. The soundman would hear it, and if he put it on the speakers the whole crew could hear it. If you had no Asdic or it was shut off you would not hear it as a signal, but the sound travelling through the water would make a noise inside the boat like "...pebbles bouncing off a roof" (I currently cannot find the source for that quote, so make of it what you will).
__________________
“Never do anything you can't take back.” —Rocky Russo |
03-31-20, 02:41 PM | #3 |
Officer
|
I heard Asdic sounded like..."gravel on the hull",
"a hawser being dragged across the hull" and "a hammer hitting the outside of the U-Boot!" (Not all at once but depending on your depth and the water temperature!) KUrtz
__________________
TorpedoTubesFireFinal. https://www.subsim.com/radioroom/dow...o=file&id=2764 2020 SubSim. https://www.youtube.com/watch?v=vWTr8me3JlM Last edited by U301; 03-31-20 at 05:40 PM. |
03-31-20, 07:14 PM | #4 |
GWX Project Director
|
It seems to me that only the sender of the pulse would hear it's return.
ie: ASW SONAR guy up top hits 'send sound pulse' and hears that ping.... if nothing is down there, he gets no return ping. He can then send more pings at will... ping... ping... ping.... (individual events.) ... now he sends a ping and hears the return/rebound ping... a double event if you will... ping-PING... Now from the hunted submarine crew perspective, they only ever hear abient individual pings that may be distant, or perhaps individual louder pings with increasing rapidity as the sender fixes the target. The sub crew never hears a ping-PING because the rebound of the pulse happens the instant it strikes the hull... ... but in a quick moment, that rebound is heard by the sender as above. If my post looks funny, it is because Major Wifey is pinging me now... |
03-31-20, 08:14 PM | #5 |
Sea Lord
Join Date: Sep 2006
Location: Adelaide, South Australia
Posts: 1,920
Downloads: 193
Uploads: 0
|
Also heard it could sound like a chain being dragged over the hull.
|
04-02-20, 02:05 AM | #6 |
Loader
Join Date: Jan 2008
Location: West Point
Posts: 87
Downloads: 1280
Uploads: 0
|
thanx guys
and Kpt. Lehmann, the explanation is very impressive, salute ! so the situation in SHCE is not technically and historically accurate, it just gives the game more fun.
__________________
Lieutenant George W. Bush |
04-02-20, 09:16 AM | #7 | |
Officer
|
Quote:
__________________
TorpedoTubesFireFinal. https://www.subsim.com/radioroom/dow...o=file&id=2764 2020 SubSim. https://www.youtube.com/watch?v=vWTr8me3JlM |
|
04-02-20, 10:09 AM | #8 |
Silent Hunter
Join Date: Dec 2004
Location: AN9771
Posts: 4,892
Downloads: 302
Uploads: 0
|
The only case the sub would hear a second (delayed) ping is through reflections on nearby objects. Like bottom bounce or bounce off a vertical shelf.
The suggestion that the sub notices the detection through double or modulated pings is a fake mechanism.
__________________
My site downloads: https://ricojansen.nl/downloads Last edited by Pisces; 04-02-20 at 01:22 PM. |
04-03-20, 02:12 PM | #9 | |
GWX Project Director
|
Quote:
I agree. I think we are saying the same thing. The ASW vessel hears the ping he sends, and that same ping rebounding from the submarine. The submarine crew would generally only hear one ping. (Although the pings may come faster as the ASW vessel fixes onto the submarine before attacking it.) |
|
04-03-20, 05:51 PM | #10 |
Silent Hunter
Join Date: Dec 2004
Location: AN9771
Posts: 4,892
Downloads: 302
Uploads: 0
|
Well, not quite. You can hear a difference in the sound around you when you are standing next to a large flat building. Those secondary paths of the sound come in delayed from the direct path, but weaker. This could also happen underwater I think. But I am no sonar technician.
__________________
My site downloads: https://ricojansen.nl/downloads |
04-03-20, 06:10 PM | #11 | |
GWX Project Director
|
Quote:
Hearing a double ping from within the sub.... that's mostly Hollywood. |
|
04-03-20, 06:14 PM | #12 |
Silent Hunter
Join Date: Dec 2004
Location: AN9771
Posts: 4,892
Downloads: 302
Uploads: 0
|
I never said it was common. But I agree with that certainly.
__________________
My site downloads: https://ricojansen.nl/downloads |
04-03-20, 06:21 PM | #13 |
GWX Project Director
|
I was just trying to keep it simple for ping's sake.
Fine. I'll see your ping, and raise you five pongs AND a boing.... for ALL the ping-pings. < sigh > |
04-14-20, 10:26 AM | #14 |
Loader
Join Date: Jan 2008
Location: West Point
Posts: 87
Downloads: 1280
Uploads: 0
|
thanx again, you two remarkable skippers.
We've learned a lot from your great explanations regarding the rebounding pulse. So now the situation is never clearer, we could conclude that the SHCE Ping-Pong simulation and some Hollywood submarine films are both fake and inaccurate. So keep fighting in the great SH3 and SH4 simulations which give us great immersion and technical accuracy.
__________________
Lieutenant George W. Bush |
|
|