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#1
Posted to sci.physics.acoustics,alt.sci.physics.acoustics,sci.geo.oceanography,rec.audio.tech,rec.audio.pro
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reducing ship noise in the oceans
What are some strategies for reducing ship, sonar, and
seismic airgun array noise in the oceans in order to reduce negative effects on marine mammals? -- David Dalton http://www.nfld.com/~dalton (home page) http://www.nfld.com/~dalton/nf.html Newfoundland&Labrador Travel & Music http://www.nfld.com/~dalton/dtales.html Salmon on the Thorns (mystic page) "Here I go again...back into the flame" (Sarah McLachlan) |
#2
Posted to rec.audio.pro
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reducing ship noise in the oceans
On 2/24/2012 10:23 PM, David Dalton wrote:
What are some strategies for reducing ship, sonar, and seismic airgun array noise in the oceans in order to reduce negative effects on marine mammals? Turn off the engine and hoist the sail! -- "Today's production equipment is IT based and cannot be operated without a passing knowledge of computing, although it seems that it can be operated without a passing knowledge of audio." - John Watkinson http://mikeriversaudio.wordpress.com - useful and interesting audio stuff |
#3
Posted to sci.physics.acoustics,alt.sci.physics.acoustics,sci.geo.oceanography,rec.audio.tech,rec.audio.pro
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reducing ship noise in the oceans
In article ,
David Dalton wrote: What are some strategies for reducing ship, sonar, and seismic airgun array noise in the oceans in order to reduce negative effects on marine mammals? I also posted that to sci.engr and other groups and there have been a couple of interesting replies there already. -- David Dalton http://www.nfld.com/~dalton (home page) http://www.nfld.com/~dalton/nf.html Newfoundland&Labrador Travel & Music http://www.nfld.com/~dalton/dtales.html Salmon on the Thorns (mystic page) "Here I go again...back into the flame" (Sarah McLachlan) |
#4
Posted to rec.audio.pro
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reducing ship noise in the oceans
On 25/02/2012 3:43 PM, Mike Rivers wrote:
On 2/24/2012 10:23 PM, David Dalton wrote: What are some strategies for reducing ship, sonar, and seismic airgun array noise in the oceans in order to reduce negative effects on marine mammals? Turn off the engine and hoist the sail! issue all fish with ear plugs |
#5
Posted to sci.physics.acoustics,alt.sci.physics.acoustics,sci.geo.oceanography,rec.audio.tech,rec.audio.pro
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reducing ship noise in the oceans
In article ,
David Dalton wrote: In article , David Dalton wrote: What are some strategies for reducing ship, sonar, and seismic airgun array noise in the oceans in order to reduce negative effects on marine mammals? I also posted that to sci.engr and other groups and there have been a couple of interesting replies there already. I also just posted to sci.military.naval and other groups. -- David Dalton http://www.nfld.com/~dalton (home page) http://www.nfld.com/~dalton/nf.html Newfoundland&Labrador Travel & Music http://www.nfld.com/~dalton/dtales.html Salmon on the Thorns (mystic page) "Here I go again...back into the flame" (Sarah McLachlan) |
#6
Posted to sci.physics.acoustics,alt.sci.physics.acoustics,sci.geo.oceanography,rec.audio.tech,rec.audio.pro
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reducing ship noise in the oceans
David Dalton wrote:
In article , David Dalton wrote: What are some strategies for reducing ship, sonar, and seismic airgun array noise in the oceans in order to reduce negative effects on marine mammals? I also posted that to sci.engr and other groups and there have been a couple of interesting replies there already. You know multiposting is kind of rude. It breaks a discussion up. It's clear you have already crossposted, why not just crosspost to all relevant groups and drop some of the irrelevant ones? The thing is, while you can reduce the noise from ships by playing with hull profiles to improve laminar flow and reduce turbulence, and playing with prop designs to reduce turbulence and cavitation, there is nothing you can do about sonar noise. Because... the whole point of sonar is that it's a loud noise. What you _can_ do is to move the operating frequency of the sonar to notes that don't bother mammals, and to do that you need to first find out what really does bother them. Which nobody really is completely sure about, it seems. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#8
Posted to rec.audio.pro
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reducing ship noise in the oceans
"Mike Rivers" wrote in message
... On 2/24/2012 10:23 PM, David Dalton wrote: What are some strategies for reducing ship, sonar, and seismic airgun array noise in the oceans in order to reduce negative effects on marine mammals? Turn off the engine and hoist the sail! +1 for that. Steve King |
#9
Posted to sci.physics.acoustics,alt.sci.physics.acoustics,sci.geo.oceanography,rec.audio.tech,rec.audio.pro
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reducing ship noise in the oceans
In article ,
(Scott Dorsey) wrote: David Dalton wrote: In article , David Dalton wrote: What are some strategies for reducing ship, sonar, and seismic airgun array noise in the oceans in order to reduce negative effects on marine mammals? I also posted that to sci.engr and other groups and there have been a couple of interesting replies there already. You know multiposting is kind of rude. It breaks a discussion up. It's clear you have already crossposted, why not just crosspost to all relevant groups and drop some of the irrelevant ones? It is recommended not to crosspost to more than five groups but yes I agree I could have dropped some, but the other two crossposts were afterthoughts after this one. -- David Dalton http://www.nfld.com/~dalton (home page) http://www.nfld.com/~dalton/nf.html Newfoundland&Labrador Travel & Music http://www.nfld.com/~dalton/dtales.html Salmon on the Thorns (mystic page) "Here I go again...back into the flame" (Sarah McLachlan) |
#10
Posted to alt.sci.physics.acoustics,sci.geo.oceanography,rec.audio.tech,rec.audio.pro
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reducing ship noise in the oceans
David Dalton wrote:
What are some strategies for reducing ship That's probably a fuel efficiency issue. sonar, Inherently noisy, the problem with it is that there is no "safe" frequency range to use considering the wide range of critter sizes. and seismic airgun array noise Not using them comes to mind, but we don't seem to want to stop using motorcars. in the oceans in order to reduce negative effects on marine mammals? Be frank about your agenda instead, it is meaningful that we should be "good neighbors" to the other species on the planet. Kind regards Peter Larsen |
#11
Posted to alt.sci.physics.acoustics,sci.geo.oceanography,rec.audio.tech,rec.audio.pro
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reducing ship noise in the oceans
Peter Larsen wrote:
snip Be frank about your agenda instead, it is meaningful that we should be "good neighbors" to the other species on the planet. Did the other creatures tell you that? I'll take "anthropomorphism" for $400, Alex... Kind regards Peter Larsen -- Les Cargill |
#12
Posted to sci.physics.acoustics,alt.sci.physics.acoustics,sci.geo.oceanography,rec.audio.tech,rec.audio.pro
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reducing ship noise in the oceans
wrote:
I'm wondering what his interest is, whether he's just dabbling or he has an academic interest of some sort. IF the later I'd think he'd have already cracked a book or two on the subject. There is an outrageous amount of information on the subject in open publications from the US Navy. A lot of it has to do with very fancy propeller designs. Expensive propeller designs, mind you, which is why you don't see them on merchant marine vessels. The Navy wants to build ships that aren't audible on passive sonar receivers. Incidentally, some of the problem with building very quiet ships is that animals run into them. Some of the film sound guys who do underwater shoots might be able to address it a little more intelligently than a bunch of live sound and studio rats, but still, i'd say the oceanographers and others might know a bit more on the subject. Here in this group most of us have a better grasp of acoustic characteristics of air It's amazing how the physics are the same. The reason I got interested in it is because almost all of the research on large phased array microphone systems is Navy-financed stuff. Beamforming in air is really interesting and a lot of the ocean work can be applied to it. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#13
Posted to rec.audio.tech,rec.audio.pro
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reducing ship noise in the oceans
Scott Dorsey wrote:
Incidentally, some of the problem with building very quiet ships is that animals run into them. Another good reason to nuke the whales. -- +--------------------------------+ + Dick Pierce | + Professional Audio Development | +--------------------------------+ |
#14
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reducing ship noise in the oceans
In article ,
Dick Pierce wrote: Scott Dorsey wrote: Incidentally, some of the problem with building very quiet ships is that animals run into them. Another good reason to nuke the whales. No, no, that's "Wales" you are thinking of. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#15
Posted to rec.audio.pro
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reducing ship noise in the oceans
On Mon 2012-Feb-27 11:04, Scott Dorsey writes:
I'm wondering what his interest is, whether he's just dabbling or he has an academic interest of some sort. IF the later I'd think he'd have already cracked a book or two on the subject. There is an outrageous amount of information on the subject in open publications from the US Navy. A lot of it has to do with very fancy propeller designs. Expensive propeller designs, mind you, which is why you don't see them on merchant marine vessels. iNdeed, I've read some on it over the years. The Navy wants to build ships that aren't audible on passive sonar receivers. Incidentally, some of the problem with building very quiet ships is that animals run into them. Yep, and that was an assumption I made when i first read about this way back, as animals that live in the sea would have to use other senses than vision to move about reliably and safely. snip Here in this group most of us have a better grasp of acoustic characteristics of air It's amazing how the physics are the same. The reason I got interested in it is because almost all of the research on large phased array microphone systems is Navy-financed stuff. Beamforming in air is really interesting and a lot of the ocean work can be applied to it. INteresting. I knew the USN was financing a bunch of phased array mic research, but hadn't really thought about that much. Quite interesting, thanks! Regards, Richard -- | Remove .my.foot for email | via Waldo's Place USA Fidonet-Internet Gateway Site | Standard disclaimer: The views of this user are strictly his own. |
#16
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reducing ship noise in the oceans
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