scholarly journals The effect of support structure on RANS actuator disc for shallow water application

2019 ◽  
Vol 670 ◽  
pp. 012078
Author(s):  
A Rahman ◽  
N B Yahaya ◽  
M T A Rahman
Keyword(s):  
Shallow Water ◽  
Water Application ◽  
Support Structure ◽  
Actuator Disc ◽  
Effect Of Support

Shallow water application of the third-generation WAM wave model

1989 ◽  
Vol 94 (C6) ◽  
pp. 8111 ◽  
Author(s):  
Luigi Cavaleri ◽  
Luciana Bertotti ◽  
Piero Lionello
Keyword(s):  
Shallow Water ◽  
Wave Model ◽  
Third Generation ◽  
Water Application ◽  
The Third

Effect of Pile-Soil Interaction on Structural Dynamics of Large MW Scale Offshore Wind Turbines in Shallow-Water Western GOM

2015 ◽  
Author(s):  
Ling Ling Yin ◽  
King Him Lo ◽  
Su Su Wang
Keyword(s):  
Wind Turbine ◽  
Shallow Water ◽  
Structural Dynamics ◽  
Turbine Rotor ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Support Structure ◽  
Tower Structure ◽  
Spring System ◽  
Different Soils

The effect of pile-soil interaction on structural dynamics is investigated for a large offshore wind turbine in the hurricane-prone Western Gulf of Mexico (GOM) shallow water. The offshore wind turbine has a rotor with three 100-meter blades and a mono-tower structure. Loads on the turbine rotor and the support structure subject to a 100-year return hurricane are determined. Several types of soil are considered and modeled with a distributed spring system. The results reveal that pile-soil interaction affects dynamics of the turbine support structure significantly, but not the wind rotor dynamics. Designed with proper pile lengths, natural frequencies of the turbine structure in different soils stay outside dominant frequencies of wave energy spectra in both normal operating and hurricane sea states, but stay between blade passing frequency intervals. Hence potential resonance of the turbine support structure is not of concern. A comprehensive Campbell diagram is constructed for safe operation of the offshore turbine in different soils.

Structural Dynamics and Load Analysis of Large Offshore Wind Turbines in Western Gulf of Mexico Shallow Water

2014 ◽  
Author(s):  
Ling Ling Yin ◽  
King Him Lo ◽  
Su Su Wang
Keyword(s):  
Gulf Of Mexico ◽  
Wind Turbine ◽  
Shallow Water ◽  
Structural Dynamics ◽  
Natural Frequencies ◽  
Offshore Wind ◽  
Normal Operation ◽  
Mode Shapes ◽  
Offshore Wind Turbine ◽  
Support Structure

In this paper, a study is conducted on wind and metocean loads and associated structural dynamics of a 13.2-MW large offshore wind turbine in Western Gulf of Mexico (GOM) shallow water. The offshore wind turbine considered includes a rotor with three 100-meter long blades and a mono-tower support structure. Natural frequencies and mode shapes of the blades and the mono-tower are determined first and used subsequently to establish a Campbell diagram for safe wind turbine operation. The results show that hydrodynamic added mass has little effect on the natural frequencies and mode shapes of the support structure but it introduces, in part, appreciable effects on loads carried by the turbine when the blades are pitched at wind speeds above the rated speed. Also determined, for normal operation and extreme metocean conditions (i.e., 100-year return hurricanes), are normal thrust on the wind rotor, blade-tip displacement, overturning moment and tower-top displacement sustained by the wind turbine.

scholarly journals Exploring the Correlation between Subsurface Residual Stresses and Manufacturing Parameters in Laser Powder Bed Fused Ti-6Al-4V

Metals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 261 ◽  
Author(s):  
Tatiana Mishurova ◽  
Katia Artzt ◽  
Jan Haubrich ◽  
Guillermo Requena ◽  
Giovanni Bruno
Keyword(s):  
Energy Density ◽  
Residual Stresses ◽  
Processing Parameters ◽  
Synchrotron Diffraction ◽  
Support Structure ◽  
Powder Bed ◽  
X Ray ◽  
Laser Velocity ◽  
Effect Of Support ◽  
Manufacturing Parameters

Subsurface residual stresses (RS) were investigated in Ti-6Al-4V cuboid samples by means of X-ray synchrotron diffraction. The samples were manufactured by laser powder bed fusion (LPBF) applying different processing parameters, not commonly considered in open literature, in order to assess their influence on RS state. While investigating the effect of process parameters used for the calculation of volumetric energy density (such as laser velocity, laser power and hatch distance), we observed that an increase of energy density led to a decrease of RS, although not to the same extent for every parameter variation. Additionally, the effect of support structure, sample roughness and LPBF machine effects potentially coming from Ar flow were studied. We observed no influence of support structure on subsurface RS while the orientation with respect to Ar flow showed to have an impact on RS. We conclude recommending monitoring such parameters to improve part reliability and reproducibility.

Sign in / Sign up

Export Citation Format

Share Document