scholarly journals Seismic Reliability Analysis of Offshore Wind Turbine Support Structure

2015 ◽  
Vol 29 (5) ◽  
pp. 342-350 ◽  
Author(s):  
Gee-Nam Lee ◽  
Dong-Hyawn Kim
Keyword(s):  
Wind Turbine ◽  
Reliability Analysis ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Support Structure ◽  
Seismic Reliability

Dynamic reliability analysis of offshore wind turbine support structure under earthquake

2015 ◽  
Vol 21 (6) ◽  
pp. 609-623 ◽  
Author(s):  
Dong-Hyawn Kim ◽  
Gee-Nam Lee ◽  
Yongjei Lee ◽  
Il-Keun Lee
Keyword(s):  
Wind Turbine ◽  
Reliability Analysis ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Support Structure ◽  
Dynamic Reliability

scholarly journals Design Optimization and Reliability Analysis of Jacket Support Structure for 5-MW Offshore Wind Turbine

2014 ◽  
Vol 28 (3) ◽  
pp. 218-226 ◽  
Author(s):  
Ji-Hyun Lee ◽  
Soo-Young Kim ◽  
Myung-Hyun Kim ◽  
Sung-Chul Shin ◽  
Yeon-Seung Lee
Keyword(s):  
Wind Turbine ◽  
Design Optimization ◽  
Reliability Analysis ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Support Structure

Monitoring Changes in the Soil and Foundation Characteristics of an Offshore Wind Turbine Using Automated Operational Modal Analysis

2013 ◽  
Vol 569-570 ◽  
pp. 652-659 ◽  
Author(s):  
Gert de Sitter ◽  
Wout Weitjens ◽  
Mahmoud El-Kafafy ◽  
Christof Devriendt
Keyword(s):  
Wind Turbine ◽  
Modal Analysis ◽  
Continuous Monitoring ◽  
Low Frequency ◽  
Operational Modal Analysis ◽  
Human Interaction ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Support Structure ◽  
Lower Natural Frequency

This paper will show the first results of a long term monitoring campaign on an offshore wind turbine in the Belgian North Sea. It will focus on the vibration levels and resonant frequencies of the fundamental modes of the support structure. These parameters will be crucial to minimize O&M costs and to extend the lifetime of offshore wind turbine structures. For monopile foundations for example, scouring and reduction in foundation integrity over time are especially problematic because they reduce the fundamental structural resonance of the support structure, aligning that resonance frequency more closely to the lower frequencies. Since both the broadband wave energy and the rotating frequency of the turbine are contained in this low frequency band, the lower natural frequency can create resonant behavior increasing fatigue damage. Continuous monitoring of the effect of scour on the dynamics of the wind turbine will help to optimize the maintenance activities on the scour protection system. To allow a proper continuous monitoring during operation, reliable state-of-the-art operational modal analysis techniques should be used and these are presented in this paper. The methods are also automated, so that no human-interaction is required and the system can track the natural frequencies and damping ratios in a reliable manner.

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