concretesubmarine.com/ FORUM

Members Login
Username 
 
Password 
    Remember Me  
Post Info TOPIC: oceanic wind turbines spar design


Guru

Status: Offline
Posts: 11015
Date:
oceanic wind turbines spar design
Permalink   
 


pof108_energie_wind1.jpg . pof108_energie_wind2.jpg


The siemens wind turbine



__________________


Guru

Status: Offline
Posts: 11015
Date:
Permalink   
 

Windmills that would float hundreds of miles out at sea could one day help satisfy our energy needs without being eyesores from land, scientists said today.

Offshore wind turbines are not new, but they typically stand on towers that have to be driven deep into the ocean floor. This arrangement only works in water depths of about 50 feet or less—close enough to shore that they are still visible.

Researchers at the Massachusetts Institute of Technology and the National Renewable Energy Laboratory (NREL) have designed a wind turbine that can be attached to a floating platform. Long steel cables would tether the corners of the floating platform to a concrete-block or other mooring system on the ocean floor, like a high-tech ship anchor. The setup is called a "tension leg platform," or TLP, and would be cheaper than fixed towers.

"You don't pay anything to be buoyant," said Paul Sclavounos, an MIT professor of mechanical engineering and naval architecture who was involved in the design.

The floating platforms to sway side to side but not bob up and down. Computer simulations suggest that even during hurricanes, the platforms would shift by only about three to six feet and that the bottom of the turbine blades would revolve well above the peak of even the highest wave. Dampers similar to those used to steady skyscrapers during high winds and earthquakes could be used to further reduce sideways motion, the researchers say.

Like the offshore windmills currently in use, the TLP's would use undersea cables to shuttle the electricity to land.

The researchers estimate their floater-mounted turbines could work in water depths ranging from about 100 to 650 feet. This means that in the northeastern United States, they could be placed about 30 to 100 miles out at sea. Because winds are stronger farther offshore, the floating windmills could also generate more energy—5.0 megawatts (MW), compared to 1.5 MW for onshore units and 3.5 MW for conventional offshore setups.

To save money, assembly of the TLP's could be done onshore—probably at a shipyard—and towed out to sea by a tugboat, the researchers say.

Sclavounos estimates that building and installing the TLP's should cost a third of what it costs to install current offshore tower windmills. Another advantage of using floating platforms is that the windmills could be moved around. If a company with 400 wind turbines in Boston needs more power in New York City, it can unhook some of their windmills and tow them south.

The researchers plan to install a half-scale prototype of their invention south of Cape Cod.

"We'd have a little unit sitting out there to show that this thing can float and behave the way we're saying it will," Sclavounos said.

 

http://www.livescience.com/7183-floating-ocean-windmills-designed-generate-power.html



__________________


Newbie

Status: Offline
Posts: 1
Date:
Permalink   
 

I am working on designing a wind turbine spar for a second year mech project. The spar has an elliptical cross section, is hollow and linearly tapered with a linearly varying wall thickness. The entire tower reaches upwards at angle.

My question is:
if I want to find out the moment and shear at some cross-section at an arbitrary height L due to the weight of the tower, how do I best resolve these to a point load acting at the centroid of the cross-section?

My initial idea was to resolve the weight of the segment of tower above the cross-section to the center of mass of that segment, then determine the moment about the centroid of the cross-section. The shear would be the component of the weight acting along the face of the cross-section...

PS: I have my axes set such that the positive y axis is concentric with the axis of the spar.

Any input would be great. Thanks!



__________________

Designer Shoes

Short Skirts



Guru

Status: Offline
Posts: 11015
Date:
Permalink   
 

It looks like you want to check for critical forces on such a turbine. The base problem is that the critical forces are introduced by wind, vibrations, and wave impact, not by the mass of the structure, so what you need to get is a realistic estimate what amount of force you need to calculate for those dynamic and not determined forces that can reach almost arbitrary numbers.

The only plan i can think of is model testing and taking the inclination of the structure and the bending of its beams as a de-facto value of forces recieved....

__________________


Guru

Status: Offline
Posts: 11015
Date:
Permalink   
 

Reading List:

Basic Concrete Engineering for Builders with CDROM / Design of Concrete Structures / Strength Design for Reinforced - Concrete Hydraulic Structures Engineering Manual on CD / Design of Offshore Concrete Structures / Construction of Marine and Offshore Structures, Second Edition (Civil Engineering - Advisors) / The Dock Manual: Designing/Building/Maintaining / Theory and Design of Concrete Shells / Thin Shell Concrete Structures / design procedures of reinforced concrete shell structures (JGJT 22-98) / Understanding Structures / Concrete Planet: The Strange and Fascinating Story of the World's Most Common Man-made Material / Concrete Construction Manual (Construction Manuals (englisch)) / Large Wind Turbines: Design and Economics / Dynamics of Offshore Structures / Offshore Technology in Civil Engineering / Design of Offshore Concrete Structures / Concrete in the Marine Environment (Modern Concrete Technology)

-- Edited by admin on Thursday 15th of March 2012 11:39:14 PM

__________________


Guru

Status: Offline
Posts: 11015
Date:
Permalink   
 

Concrete Floating Structures

Surface Floating Concepts:

The axes of ocean colonization / floating real estate building lots on the water / Plate Seastead - Plate Floating Element for Ocean Colonization / Catamaran Concrete Floating Elements - Base for Ocean Living / Floating Concrete Breakwater Marina / Ocean colonization how to get there / Ramform ship island as ocean base mobile stable scaleable / small honeycomb floating concrete structures in cartagena / Seabreaks for dampening colossal ocean waves / Ocean colonization technology / Ocean colonization company / Oustanding floating concrete structures / ocean colonization general considerations / Interesting projects for ocean colonization / Aquaculture, business, trade, mininig, energy, salvage, making money afloat /

Submerged Concepts:

The captain nemo float out - seasteading / Sub movement finished - Submarine Yacht / Is submarine living space expensive? / concrete pressure vessel / Concrete submarine project / submarine yacht / concrete submarine yacht supporter club / Submerged living space bubble concept basics / Exotic Submerged Bubble Hotel / sea orbiter / Current Turbine Concrete Hull /



__________________


Guru

Status: Offline
Posts: 11015
Date:
Permalink   
 

Richard Branson, Necker Island, Virgin Oceanic, James Cameron, Bob Ballard, Chris Welch, Wilfried Ellmer, floating concrete platforms, honeycomb floating platform, floating concrete shell construction, ocean colonization business alliance, ocean base, deep sea investigation, vent base alpha, deep sea mining, oceanic aquaculture, floating structure development, floating marina development, key player network, underwater hotels, underwater tourism development, submarine yacht, seasteading, Peter Thiel, ocean investigation, business, Greg Venter,

__________________


Guru

Status: Offline
Posts: 11015
Date:
Permalink   
 

yook3.com

__________________
Anonymous

Date:
Permalink   
 

This one is good. keep up the good work!.. long distance Movers transport Lansing MI



__________________


Newbie

Status: Offline
Posts: 1
Date:
Permalink   
 

The same idea is used in offshore wind technology to present the Hywind. However, it is possible to design spar-type wind turbines for moderate water depths. Offshore wind farms have many of the same advantages as land-based wind farms – they provide renewable energy; they do not consume water.



__________________

http://cuddlebite.com



Newbie

Status: Offline
Posts: 3
Date:
Permalink   
 

If there are such difficulties with preparations and in general you work and have no time to study, it would be easier to think about buying an education. I thought for a long time that it would be a mistake on my part, but the guys gosznak-diploms.com/kupit-diplom-v-moskve did not let me down at all.


__________________


Guru

Status: Offline
Posts: 2326
Date:
Permalink   
 

I precisely needed to thank you very much once more. I am not sure what I would have undertaken in the absence of the actual tips and hints discussed by you over my topic. It truly was the terrifying matter for me, but understanding the very professional avenue you treated that made me to cry for gladness. Extremely thankful for your assistance and expect you are aware of a great job you’re accomplishing instructing the others through the use of a web site. I’m certain you have never met all of us. payarc iso agent program



__________________


Guru

Status: Online
Posts: 7134
Date:
Permalink   
 

That appears to be certainly great. Most of these teeny specifics are designed having great deal of track record expertise. I'm keen on the item lots 온라인 카지노 사이트



__________________


Guru

Status: Offline
Posts: 6319
Date:
Permalink   
 

That are surely wonderful. A large number of tiny essentials are created obtaining lot of reputation know-how. I am just looking towards an item tons. dtg printer



__________________


Guru

Status: Online
Posts: 3260
Date:
Permalink   
 

Aw, it was a really nice post. In notion I have to put in place writing like this additionally – spending time and actual effort to have a top notch article… but what can I say… I procrastinate alot and also by no indicates apparently go carried out. casinostars.se



__________________
Page 1 of 1  sorted by
 
Quick Reply

Please log in to post quick replies.



Create your own FREE Forum
Report Abuse
Powered by ActiveBoard