SUBSIM: The Web's #1 resource for all submarine & naval simulations since 1997 |
03-06-18, 07:40 PM | #1 |
Nub
Join Date: Jan 2018
Location: San Diego, CA
Posts: 3
Downloads: 1
Uploads: 0
|
Are hull expansion and plane hydraulic noise modeled?
I read on reddit's /r/coldwaters that transients from angling dive planes and from the expansion and contraction of the hull when rapidly changing depth actually generate noise in-game and can lead to your being counter-detected. Is this true? If so, how do you minimize it? I'm wondering if this is why I seem to be counter-detected by certain surface ships and submarines in the 1984 campaign within minutes of starting a mission game regardless of how far away I start or how fast I am going, even on casual difficulty.
|
03-07-18, 03:33 PM | #2 |
Stowaway
Posts: n/a
Downloads:
Uploads:
|
A while back one of the KillerFish crew was on Jive Talk with Jive turkey and patreons and he commented that they are aware of bug that has people getting detected as soon as entering a mission (unintentional). If this is the case, we have to deal with it until next patch.
Also, my understanding is start distance to your mission contact (25, 15, 10k yrds), the sub you're using, are factors as well as your speed if/when detected and possibly over head flights by ASW air craft and/or satellites could potentially play into your initial detection. As for hull popping/hydralics, I haven't heard that this is a noise factor, though seeing as we can hear ships breaking up, I would not be surprised if sudden depth changes shallow or deep would play into your noise signature. It would be closer to reality, anyhow. |
03-11-18, 01:09 AM | #3 |
Loader
Join Date: Nov 2017
Posts: 90
Downloads: 9
Uploads: 0
|
my guess is that "breakup noises" in game are just the sonar picking up a contact that the game identifies as destroyed. The sonar isn't actually picking up the ship's death throes.
|
03-11-18, 12:19 PM | #4 | |
Frogman
Join Date: Feb 2007
Location: USA
Posts: 308
Downloads: 104
Uploads: 0
|
Quote:
Unintentional? LOL. I make it a habit to peruse the forums of games I MIGHT be considering purchasing and this is the type of info that puts me into "purchase freeze" mode. Maybe next year after several patches and bargain bin Steam sale prices. |
|
03-11-18, 02:11 PM | #5 | |
Ocean Warrior
Join Date: Dec 2007
Location: Between test depth and periscope depth
Posts: 3,021
Downloads: 175
Uploads: 16
|
Quote:
__________________
USS Kentucky SSBN 737 (G) Comms Div 2003-2006 Qualified 19 November 03 Yes I was really on a submarine. |
|
03-13-18, 06:55 PM | #6 |
Watch
Join Date: Dec 2017
Location: New England
Posts: 30
Downloads: 2
Uploads: 0
|
In real life, hull compression and expansion when changing depth makes minimal noise and isn't a classification cue unless you're in a (very) close trail, which causes an acoustic phenomena called Near Field Effect.
Transients from plane movement can occur, depending on the boat, but aren't common. We spent two months with fairwater planes that not only sounded like biologics every time they moved, but occasionally set off the torpedo detector, due to the many frequencies produced. We couldn't get that repaired soon enough!
__________________
Sagire, Classis, Destructum! |
03-16-18, 03:28 PM | #7 |
Mate
Join Date: Jun 2017
Posts: 58
Downloads: 25
Uploads: 0
|
This is interesting because 'older boats', say Skipjacks and Permits had issues. So in a battle of new vs old, it could be problem. Jive Turkey had the SJ out was reporting "explosions' as he cruise 700 ft before leveling out and the RBU's started dropping. It would probably be unique on a boat basis, and its duty/maintenance cycle. I suspect it's just averaged into a boat's self-noise. Some are quiet and some aren't.
|
03-22-18, 03:57 AM | #8 | |
Nub
Join Date: Jan 2018
Location: San Diego, CA
Posts: 3
Downloads: 1
Uploads: 0
|
Quote:
|
|
03-23-18, 08:49 PM | #9 | |
Chief
Join Date: Dec 2010
Location: U-32's Wintergarten
Posts: 325
Downloads: 177
Uploads: 0
|
Quote:
I was getting instantly detected nearly every time and couldn't figure out why, then one day it just stopped and everything seemed to be normal. But like I say, this was way back right after release. |
|
|
|