From: "Peter Madsen" <peter@submarines.dk>
Reply-To: personal_submersibles@psubs.org
To: <personal_submersibles@psubs.org>
Subject: Re: [PSUBS-MAILIST] Collition with surface vessel
Date: Wed, 9 May 2007 11:17:57 +0200
David,
I am curently purchasing hydrophones from Dolphinear - to make experiments
with underwater acoustic behavior. I sounds like this work has already been
done - what - apart from flying to the US can I do to get to know more ?
Commersial hydrophones are normaly omnydirectional - and my job is to
somehow turn it unidirrectional either using an array or a deflector - that
can be turned around...
If we can tell the direction to a sound contact within say 30 deg - its
fine.
Regards,
Peter
----- Original Message ----- From: "David Bartsch"
<dbartsch2236@hotmail.com>
To: <personal_submersibles@psubs.org>
Sent: Thursday, May 10, 2007 7:32 AM
Subject: RE: [PSUBS-MAILIST] Collition with surface vessel
Peter,
An impact with a surface contact while surfacing or proceeding to a
shallow depth such as periscope depth is a very real danger for a
submarine and would be concidered as the most hazardous proceedure. The
crew of the U.S.S. Greenling skipped various saftey checks and we all know
the end result.
A gent from California will be bringing to this years convention a
passive sonar system how-to instructional guide that I have been
developing for some time.
In short, Once the audio listening level is set to a good level on this
thing, You simply turn a small handwheel to point in the desired listening
direction and listen. Simple! The hydrophones are stationary in a small
array outside of the preasure hull and the selection as to which one is
being listened to is done within a hydrophone selector unit inside the
sub. It uses a fraction of the power consumed by an active depth sounder
and is seperate from the power for any other onboard system. (A hydrophone
placed atop a rotating mast work well, but movement of the mast will
surely interfier with your reception. Turn then listen...turn then
listen...)
Give this information a good look when it affords itself and perhaps it
will be worth your while.
From: "Peter Madsen" <peter@submarines.dk>
Reply-To: personal_submersibles@psubs.org
To: <personal_submersibles@psubs.org>
Subject: [PSUBS-MAILIST] Collition with surface vessel
Date: Tue, 8 May 2007 00:27:47 +0200
Hi Psubbers,
When people talk of submarine safety the situation most often assumed is
a sub in distress on the seabed. This is of cause a very critical
situation,
and we all design boats that are redundant in many ways so that we
hopefully never get in that situation.
In my practical experience - however - getting hit by a passing surface
vessel when being at or very close to surface is a much more likely
incident. Depending on the speed and size of the vessel and submarine any
level of damage is possible - and the sub I likely to sink with its
pressurehull ruptured to some extent after the collision.
We are currently adding hydrophones to Kraka for detection and
classification of surface sound contacts, and we are designing a cable
camera for the UC3 - that can be send up prior to surfacing. We hope
these technical gadgets may make it more safe to operate our subs.
The professionel submariners ( navy ) that I have talked to say that they
solely depend on their passive sensors - hydrophone arrays - and they
have zero way of detecting a drifting - stopped or sailing vessel.
What do other non navy submarine operator do - how do you psubbers handle
this safety issue ? Most people ask me why we don't just have an
underwater radar ?! - or is it sonar - a sea surface hull detection
device...like the navy...
Well - what do you do ?
Regards,
Peter Madsen
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