The Experts below are selected from a list of 1755588 Experts worldwide ranked by ideXlab platform
Kostas F. Lambrakos - One of the best experts on this subject based on the ideXlab platform.
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Model Test data correlations with fully coupled hull mooring analysis for a floating wind turbine on a semi submersible platform
ASME 2014 33rd International Conference on Ocean Offshore and Arctic Engineering, 2014Co-Authors: Andrew J Goupee, Kostas F. LambrakosAbstract:The DeepCwind floating wind turbine Model Tests were performed at MARIN (Maritime Research Institute Netherlands) with a Model set-up corresponding to a 1:50 Froude scaling. In the Model Tests, the wind turbine was a scaled Model of the National Renewable Energy Lab (NREL) 5MW, horizontal axis reference wind turbine supported by three different generic floating platforms: a spar, a semi-submersible and a tension-leg platform (TLP) (Ref. [1] and [2]). This paper presents validation of the MLTSIM-FAST [3] code with DeepCwind semi-submersible wind turbine Model Test results. In this integrated program, the turbine tower and rotor dynamics are simulated by the subroutines of FAST [4], and the hydrodynamic loads and mooring system dynamics are simulated by the subroutines of MLTSIM. In this study, fully coupled hull/mooring dynamics and second-order difference-frequency response are included in MLTSIM-FAST. The analysis results are systematically compared with Model Test results and show good agreement.Copyright © 2014 by ASME
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Model Test Data Correlations With Fully Coupled Hull/Mooring Analysis for a Floating Wind Turbine on a Semi-Submersible Platform
Volume 9B: Ocean Renewable Energy, 2014Co-Authors: Andrew J Goupee, Kostas F. LambrakosAbstract:The DeepCwind floating wind turbine Model Tests were performed at MARIN (Maritime Research Institute Netherlands) with a Model set-up corresponding to a 1:50 Froude scaling. In the Model Tests, the wind turbine was a scaled Model of the National Renewable Energy Lab (NREL) 5MW, horizontal axis reference wind turbine supported by three different generic floating platforms: a spar, a semi-submersible and a tension-leg platform (TLP) (Ref. [1] and [2]). This paper presents validation of the MLTSIM-FAST [3] code with DeepCwind semi-submersible wind turbine Model Test results. In this integrated program, the turbine tower and rotor dynamics are simulated by the subroutines of FAST [4], and the hydrodynamic loads and mooring system dynamics are simulated by the subroutines of MLTSIM. In this study, fully coupled hull/mooring dynamics and second-order difference-frequency response are included in MLTSIM-FAST. The analysis results are systematically compared with Model Test results and show good agreement.Copyright © 2014 by ASME
Andrew J Goupee - One of the best experts on this subject based on the ideXlab platform.
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Model Test data correlations with fully coupled hull mooring analysis for a floating wind turbine on a semi submersible platform
ASME 2014 33rd International Conference on Ocean Offshore and Arctic Engineering, 2014Co-Authors: Andrew J Goupee, Kostas F. LambrakosAbstract:The DeepCwind floating wind turbine Model Tests were performed at MARIN (Maritime Research Institute Netherlands) with a Model set-up corresponding to a 1:50 Froude scaling. In the Model Tests, the wind turbine was a scaled Model of the National Renewable Energy Lab (NREL) 5MW, horizontal axis reference wind turbine supported by three different generic floating platforms: a spar, a semi-submersible and a tension-leg platform (TLP) (Ref. [1] and [2]). This paper presents validation of the MLTSIM-FAST [3] code with DeepCwind semi-submersible wind turbine Model Test results. In this integrated program, the turbine tower and rotor dynamics are simulated by the subroutines of FAST [4], and the hydrodynamic loads and mooring system dynamics are simulated by the subroutines of MLTSIM. In this study, fully coupled hull/mooring dynamics and second-order difference-frequency response are included in MLTSIM-FAST. The analysis results are systematically compared with Model Test results and show good agreement.Copyright © 2014 by ASME
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Model Test Data Correlations With Fully Coupled Hull/Mooring Analysis for a Floating Wind Turbine on a Semi-Submersible Platform
Volume 9B: Ocean Renewable Energy, 2014Co-Authors: Andrew J Goupee, Kostas F. LambrakosAbstract:The DeepCwind floating wind turbine Model Tests were performed at MARIN (Maritime Research Institute Netherlands) with a Model set-up corresponding to a 1:50 Froude scaling. In the Model Tests, the wind turbine was a scaled Model of the National Renewable Energy Lab (NREL) 5MW, horizontal axis reference wind turbine supported by three different generic floating platforms: a spar, a semi-submersible and a tension-leg platform (TLP) (Ref. [1] and [2]). This paper presents validation of the MLTSIM-FAST [3] code with DeepCwind semi-submersible wind turbine Model Test results. In this integrated program, the turbine tower and rotor dynamics are simulated by the subroutines of FAST [4], and the hydrodynamic loads and mooring system dynamics are simulated by the subroutines of MLTSIM. In this study, fully coupled hull/mooring dynamics and second-order difference-frequency response are included in MLTSIM-FAST. The analysis results are systematically compared with Model Test results and show good agreement.Copyright © 2014 by ASME
Ronaldo I Borja - One of the best experts on this subject based on the ideXlab platform.
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centrifuge Model Test on the face stability of shallow tunnel
Acta Geotechnica, 2011Co-Authors: Gregor Idinger, Pelin Aklik, Wei Wu, Ronaldo I BorjaAbstract:This paper is an investigation of face stability on a small-scale tunnel Model in a geotechnical centrifuge. By making use of symmetry, half of the tunnel cross section was considered. The support at excavation face was provided by a piston, which was adjusted during flight. Some aspects on the collapse at tunnel face are investigated for different overburden pressures: failure mechanism, surface settlement, stress acting at tunnel face, and the required face support counteracting the earth pressure. Ground deformation was observed through a transparent wall and measured by digital image correlation. The results from centrifuge Model Tests were compared with theoretical Models.
Dan Zhou - One of the best experts on this subject based on the ideXlab platform.
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moving Model Test of high speed train aerodynamic drag based on stagnation pressure measurements
PLOS ONE, 2017Co-Authors: Mingzhi Yang, Juntao Du, Zhiwei Li, Sha Huang, Dan ZhouAbstract:A moving Model Test method based on stagnation pressure measurements is proposed to measure the train aerodynamic drag coefficient. Because the front tip of a high-speed train has a high pressure area and because a stagnation point occurs in the center of this region, the pressure of the stagnation point is equal to the dynamic pressure of the sensor tube based on the obtained train velocity. The first derivation of the train velocity is taken to calculate the acceleration of the train Model ejected by the moving Model system without additional power. According to Newton’s second law, the aerodynamic drag coefficient can be resolved through many Tests at different train speeds selected within a relatively narrow range. Comparisons are conducted with wind tunnel Tests and numerical simulations, and good agreement is obtained, with differences of less than 6.1%. Therefore, the moving Model Test method proposed in this paper is feasible and reliable.
Gregor Idinger - One of the best experts on this subject based on the ideXlab platform.
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centrifuge Model Test on the face stability of shallow tunnel
Acta Geotechnica, 2011Co-Authors: Gregor Idinger, Pelin Aklik, Wei Wu, Ronaldo I BorjaAbstract:This paper is an investigation of face stability on a small-scale tunnel Model in a geotechnical centrifuge. By making use of symmetry, half of the tunnel cross section was considered. The support at excavation face was provided by a piston, which was adjusted during flight. Some aspects on the collapse at tunnel face are investigated for different overburden pressures: failure mechanism, surface settlement, stress acting at tunnel face, and the required face support counteracting the earth pressure. Ground deformation was observed through a transparent wall and measured by digital image correlation. The results from centrifuge Model Tests were compared with theoretical Models.
