All the documents I can find on electric ship propulsion shows that it was for 
efficiency reasons and flexibility,
so the prime mover + generator can be placed anywhere and no long prop shaft is 
needed.
Only the last of the 3 docs that I read (the IEEE one) has a short mention of a 
war-time reason to go for
electric drive on page 8 about the T2 "Navy Oilers", but it is not the Diesel 
Engine, instead it mentions the reduction gearing needed for the
diesel engine as the limiting production level, so switching to electric drive 
removed the reduction gear
requirement and thus more ships could be built.
Another (more recent) argument is the full coversion of the ships to electric, 
not just its propulsion.
Even the aircraft catapult is converted to electric, so the ship receives a 
jolt of power when a plane lands,
comparable to regen braking. It also avoids the piping needed for the 
traditionally steam-powered catapult.
Then the use of rail guns make a powerful electric generator required. This is 
easy if you already have a
powerful electric propulsion.
Another argument is surviveability.
It is simple to split a primary mover engine in two and place them in different 
parts of the ship
or align them differently than traditional. This is not new. Even steam 
turbines were repositioned
when they were installed as generators connected to electric drive motors.

http://futureforce.navylive.dodlive.mil/2015/08/electric-ship-propulsion/
https://www.defensemedianetwork.com/stories/going-electric/
http://folk.ntnu.no/torarnj/IEEE_Proceedings_Skjong_2015.pdf
Quote from page 8: "At this time the turbo-electric propulsion system
was  not  a  new  invention,  as  all  the  capacity  to  manufacture
reduction gears was committed to supplying the naval fleet, the
use of turbo-electric propulsion was a natural choice resulting
in an average production time from laying the keel to sea trials
to about 70 days"

-----Original Message-----
From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of Alan Arrison via EV
Sent: Wednesday, October 04, 2017 2:42 PM
To: ev@lists.evdl.org
Cc: Alan Arrison
Subject: Re: [EVDL] EVLN: YARA Birkeland zero emission autonomous cargo e-ship 
(v)

Where did the electricity come from for the electric drive motors?

It had to be some kind of fossil fuel engine running a generator.

Al


On 10/4/2017 11:20 AM, ROBERT via EV wrote:
> The electrification of ships has a long history.  During WWII, diesel engines 
> were in short supply. The US needed tanker ships because a large number were 
> sunk by the German U2 boats.  The T2 class tanker was the primary tanker.  
> Since diesel engines were in short supply, the US started installing large 
> electric propulsion motors.  Even today some of these T2 tankers are still in 
> service with the original electric motors.  In the 1980's, I did some design 
> work on the electrical control system on the USNS Redstone.  The Redstone was 
> a T2 tanker with the original electric motors and drive cubicle.  The ship 
> had been extended by 72ft by adding a section in the center.  The Redstone 
> was station in FL and monitored launches from Cape Canaveral/Kennedy.  The 
> ship was finally decommissioned in the 2000s and cut up for scrap.  The 
> electric motors and drive controls were built by GE and as far as I know they 
> operated trouble free.  I reviewed the controls for possible replacement; 
> however, due to cost it was not done.  In addition, they still worked OK.  
> The controls were manually operated and the contractors made a huge noise 
> when operating.  To say the least, the electric propulsion system and drive 
> was amazing.  Great job for me.
>
>
> Most if not all ocean going cruise ships have AC/AC drives.  The QE2 was 
> converted in the 1980 to AC/AC drives.
>
>
>
>
> ________________________________
> From: EV <ev-boun...@lists.evdl.org> on behalf of brucedp5 via EV 
> <ev@lists.evdl.org>
> Sent: Wednesday, October 4, 2017 4:08 AM
> To: ev@lists.evdl.org
> Cc: brucedp5
> Subject: [EVDL] EVLN: YARA Birkeland zero emission autonomous cargo 
> e-ship (v)
>
>
>
> https://cleantechnica.com/2017/09/30/final-design-autonomous-electric-
> container-vessel-known-yara-birkeland-revealed/
> [https://cleantechnica.com/files/2017/09/final-design-of-autonomous-al
> l-e-150x150.jpg]<https://cleantechnica.com/2017/09/30/final-design-aut
> onomous-electric-container-vessel-known-yara-birkeland-revealed/>
>
> Final Design Of Autonomous, All-Electric Container Vessel - Yara 
> Birkeland - 
> Revealed<https://cleantechnica.com/2017/09/30/final-design-autonomous-
> electric-container-vessel-known-yara-birkeland-revealed/>
> cleantechnica.com
> The final design of the all-electric, autonomous container ship known 
> as the Yara Birkeland has now been completed, and testing has 
> commenced at SINTEF Ocean's 80 metre test tank facility in Trondheim, 
> Norway. Accompanying this announcement, the Norwegian government 
> enterprise known as ENOVA revealed that it will be providing support 
> to the project in the form
>
>
> Final Design Of Autonomous, All-Electric Container Vessel - Yara 
> Birkeland - Revealed September 30th, 2017  James Ayre
>
> [videos
> https://youtu.be/CK600K1tYUQ
> [https://i.ytimg.com/vi/CK600K1tYUQ/maxresdefault.jpg]<https://youtu.b
> e/CK600K1tYUQ>
>
> Testing the YARA Birkeland<https://youtu.be/CK600K1tYUQ>
> youtu.be
> Model tank testing of the worlds first autonomous zero emission container 
> feeder.
>
>
> Testing the YARA Birkeland
>
> https://youtu.be/OdWOAgc79aM
> [https://i.ytimg.com/vi/OdWOAgc79aM/maxresdefault.jpg]<https://youtu.b
> e/OdWOAgc79aM>
>
> Autonomous ship model tank testing<https://youtu.be/OdWOAgc79aM>
> youtu.be
> Model tank testing of the worlds first autonomous zero emission container 
> feeder, the YARA Birkeland.
>
>
> Autonomous ship model tank testing
>
> https://youtu.be/4Ogg4_ge0f8
> [https://i.ytimg.com/vi/4Ogg4_ge0f8/hqdefault.jpg]<https://youtu.be/4O
> gg4_ge0f8>
>
> YARA Birkeland zero emission autonomous container 
> feeder<https://youtu.be/4Ogg4_ge0f8>
> youtu.be
> The first commercial autonomous vessel in the world, and also the first 
> commercial zero ballast vessel. A game changer for the environment and for 
> the shippi...
>
>
> YARA Birkeland zero emission autonomous cargo e-ship ]
>
> The final design of the all-electric, autonomous container ship known 
> as the Yara Birkeland has now been completed, and testing has 
> commenced at SINTEF Ocean's 80 metre test tank facility in Trondheim, Norway.
>
> Accompanying this announcement, the Norwegian government enterprise 
> known as ENOVA revealed that it will be providing support to the 
> project in the form of a NOK 133 million ($16.7 million) financial 
> contribution.
>
> While a full-scale version of the new design has yet to be revealed 
> (obviously), the recent announcement was accompanied by the reveal of 
> a 6-meter long, 2.4-ton model. The ship itself is expected to be 
> delivered and to begin testing and operations in early 2019, with 
> fully autonomous functioning expected to begin in 2020.
>
> Once in operation, the Yara Birkeland will displace the equivalent of 
> 40,000 semi truck trips from Yara's Porsgrunn fertiliser plant in 
> southern Norway to the ports of Brevik and Larvik - and will thus 
> curtail substantial greenhouse gas emissions.
>
> The press release provides more: "Following the announcement in May, 
> the vessel has been designed at Norwegian design and engineering 
> company Marin Teknikk. A cutting edge six meter long and 2.4 tons 
> model of the final design using technology destined for the real ship, 
> including a fully working thruster system from KONGSBERG, will now 
> undergo comprehensive testing at SINTEF Ocean before construction of the 
> full-scale vessel starts.
> The decision of where the vessel is to be built will be decided and 
> disclosed by the end of 2017."
>
> The President and CEO of KONGSBERG, Geir Håøy, commented on the news:
> "Initial tests of the model were successful, proving both concept and 
> the technology. The testing at SINTEF Ocean marks an important 
> milestone in the development. This vessel is important for the entire 
> maritime industry, and Yara deserves praise for their initiative and 
> commitment. Yara Birkeland is the start of a major contribution to 
> fulfilling national and international environmental impact goals, and 
> will be a global milestone for seaborne transportation."
>
> KONGSBERG itself will be providing the Yara Birkeland's electric 
> drive, battery systems, propulsion control systems, and autonomous system 
> sensors.
> [© Sustainable Enterprises Media]
>
>
>
>
> For EVLN EV-newswire posts use:
> http://evdl.org/evln/
> EVDL EV News Archive - Electric Vehicle Discussion 
> List<http://evdl.org/evln/> evdl.org EVLN - EV News Archive Edited by 
> Bruce {EVangel} Parmenter: EVLN: home | help | archive | news | 
> privacy policy | terms of service
>
>
>
>
> {brucedp.neocities.org}
>
> --
> Sent from: 
> http://electric-vehicle-discussion-list.413529.n4.nabble.com/
> Electric Vehicle Discussion List | Mailing List 
> Archive<http://electric-vehicle-discussion-list.413529.n4.nabble.com/>
> electric-vehicle-discussion-list.413529.n4.nabble.com
> Electric Vehicle Discussion List forum and mailing list archive. Welcome to 
> the EVDL! This forum is a web &quot;front end&quot; and archive for an email 
> discussion list. If you post here and...
>
>
> _______________________________________________
> UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
> [http://www.evdl.org/images/evdl.jpg]<http://www.evdl.org/help/index.h
> tml#usub>
>
> EVDL Subscription Information and 
> Help<http://www.evdl.org/help/index.html#usub>
> www.evdl.org
> About the EVDL: The Electric Vehicle Discussion List, founded in 1991 by EV 
> enthusiast Clyde Visser, is an active and vital source of information and 
> help for people ...
>
>
> http://lists.evdl.org/listinfo.cgi/ev-evdl.org
> EV -- Electric Vehicle Discussion List - lists.evdl.org 
> ...<http://lists.evdl.org/listinfo.cgi/ev-evdl.org>
> lists.evdl.org
> The Electric Vehicle Discussion List is a forum for discussing the current 
> state of the art and future direction of electric vehicles (EVs). We define 
> an EV as a ...
>
>
> Please discuss EV drag racing at NEDRA 
> (http://groups.yahoo.com/group/NEDRA)
>
> -------------- next part -------------- An HTML attachment was 
> scrubbed...
> URL: 
> <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20171004/10
> b5e34b/attachment.html> 
> _______________________________________________
> UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
> http://lists.evdl.org/listinfo.cgi/ev-evdl.org
> Please discuss EV drag racing at NEDRA 
> (http://groups.yahoo.com/group/NEDRA)
>
>


_______________________________________________
UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
http://lists.evdl.org/listinfo.cgi/ev-evdl.org
Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)

_______________________________________________
UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
http://lists.evdl.org/listinfo.cgi/ev-evdl.org
Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)

Reply via email to