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You searched for +publisher:"Texas A&M University" +contributor:("St?l, Achim"). Showing records 1 – 2 of 2 total matches.

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Texas A&M University

1. Shim, Sangyun. Coupled dynamic analysis of floating offshore wind farms.

Degree: 2009, Texas A&M University

During the past decade, the demand for clean renewable energy continues to rise drastically in Europe, the US, and other countries. Wind energy in the ocean can possibly be one of those future renewable clean energy sources as long it is economically feasible and technologically manageable. So far, most of the offshore wind farm research has been limited to fixed platforms in shallow-water areas. In the water depth deeper than 30m, however, floating-type wind farms tend to be more feasible. Then, the overall design and engineering becomes more complicated than fixed platforms including the coupled dynamics of platforms, mooring lines, and blades. In the present study, a numerical time-domain model has been developed for the fully coupled dynamic analysis of an offshore floating wind turbine system including blade-rotor dynamics and platform motions. As a test case, the TLP-type floater system with 3 blades of 70-m diameter designed by the National Renewable Energy Laboratory (NREL) is selected to analyze the dynamic coupling effects among floating system, mooring lines, and wind turbine. The performance of the selected system in a typical wind-wave-current condition has been simulated and analyzed. A similar study for the floater and rotor coupled dynamic analysis was conducted by MIT and NREL. However, in the present case, the dynamic coupling between platform and mooring lines are also considered in addition to the rotor-floater dynamic coupling. It is seen that the rotor-floater coupling effects increase with wind velocity and blade size. The increased coupling effects tend to increase the dynamic tension of TLP tethers. The developed technology and numerical tool are applicable to the new offshore floating wind farms planned in the future. Advisors/Committee Members: Kim, M. H (advisor), Randall, Robert (committee member), St?l, Achim (committee member).

Subjects/Keywords: Coupling; Wind farms

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Shim, S. (2009). Coupled dynamic analysis of floating offshore wind farms. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2564

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Shim, Sangyun. “Coupled dynamic analysis of floating offshore wind farms.” 2009. Thesis, Texas A&M University. Accessed March 19, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-2564.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Shim, Sangyun. “Coupled dynamic analysis of floating offshore wind farms.” 2009. Web. 19 Mar 2019.

Vancouver:

Shim S. Coupled dynamic analysis of floating offshore wind farms. [Internet] [Thesis]. Texas A&M University; 2009. [cited 2019 Mar 19]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2564.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Shim S. Coupled dynamic analysis of floating offshore wind farms. [Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2564

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


Texas A&M University

2. Cheon, Woo Geunn. Impact of the Southern ocean winds on sea-ice - ocean interaction and its associated global ocean circulation in a warming world.

Degree: 2009, Texas A&M University

This dissertation discusses a linkage between the Southern Ocean (SO) winds and the global ocean circulation in the framework of a coarse-resolution global ocean general circulation model coupled to a sea-ice model. In addition to reexamination of the conventional linkage that begins with northward Ekman transport and extends to the North Atlantic (NA) overturning, the author investigates a new linkage that begins with the Southern Hemisphere (SH) sea-ice ? ocean interaction perturbed by the anomalous SO winds and extends to the SH overturning, the response of the NA overturning, and the long-term baroclinic adjustment of the Antarctic Circumpolar Current (ACC). How the above two linkages will interact with each other in a warming world is also investigated. An interactive momentum flux forcing, allowing for the strength of momentum flux between atmosphere and sea ice to vary in response to the simulated sea-ice conditions, enhances wind-driven ice divergence to increase the fraction of leads and polynyas, which increases dense water formation, and thus intensifies convection. Within three experimental frameworks, this increased dense water consistently increases the Antarctic Bottom Water formation, which directly intensifies the SH overturning and indirectly weakens the NA overturning. As a result of the hemispheric change in overturning circulations, the meridional density gradient across the ACC appears to increase, ultimately increasing the baroclinic part of the ACC via an enhanced thermal wind shear. Subsequently, impacts of the poleward shifted and intensified SH subpolar westerly winds (SWWs) on the global ocean circulation are investigated in phases. When the SWWs are only shifted poleward, the effect of the anomalous winds is transmitted to the northern NA, decreasing both the NA overturning and the North Atlantic Deep Water (NADW) outflow. However, when the SWWs are shifted poleward and intensified, this effect is cut off by the intensified Deacon cell overturning, and is not transmitted to the northern NA, and instead increases the NADW outflow substantially. To sum up, with respect to the SO winds perturbed by the global warming, the SH overturning cell and the NADW outflow increase, leading to an increase in the volume transport of the ACC. Advisors/Committee Members: St?l, Achim (advisor), Chang, Ping (committee member), Giese, Benjamin (committee member), Saravanan, R. (committee member).

Subjects/Keywords: Southern Ocean winds; sea-ice - ocean interaction; global ocean circulation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Cheon, W. G. (2009). Impact of the Southern ocean winds on sea-ice - ocean interaction and its associated global ocean circulation in a warming world. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-3029

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Cheon, Woo Geunn. “Impact of the Southern ocean winds on sea-ice - ocean interaction and its associated global ocean circulation in a warming world.” 2009. Thesis, Texas A&M University. Accessed March 19, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-3029.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Cheon, Woo Geunn. “Impact of the Southern ocean winds on sea-ice - ocean interaction and its associated global ocean circulation in a warming world.” 2009. Web. 19 Mar 2019.

Vancouver:

Cheon WG. Impact of the Southern ocean winds on sea-ice - ocean interaction and its associated global ocean circulation in a warming world. [Internet] [Thesis]. Texas A&M University; 2009. [cited 2019 Mar 19]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-3029.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Cheon WG. Impact of the Southern ocean winds on sea-ice - ocean interaction and its associated global ocean circulation in a warming world. [Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-3029

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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