Operational Modal Analysis of Wind Turbine Drivetrain with Focus on Damping Extraction

2020 ◽  
pp. 399-405
Author(s):  
Pieter-Jan Daems ◽  
Cédric Peeters ◽  
Patrick Guillaume ◽  
Jan Helsen
Keyword(s):  
Wind Turbine ◽  
Modal Analysis ◽  
Operational Modal Analysis

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.

scholarly journals Structural health monitoring of offshore wind turbines using automated operational modal analysis

2014 ◽  
Vol 13 (6) ◽  
pp. 644-659 ◽  
Author(s):  
Christof Devriendt ◽  
Filipe Magalhães ◽  
Wout Weijtjens ◽  
Gert De Sitter ◽  
Álvaro Cunha ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Modal Analysis ◽  
Wind Turbines ◽  
Operational Modal Analysis ◽  
Offshore Wind ◽  
Dynamic Monitoring ◽  
Mode Shapes ◽  
Offshore Wind Turbine ◽  
Complex Frequency ◽  
Offshore Wind Turbines

This article will present and discuss the approach and the first results of a long-term dynamic monitoring campaign on an offshore wind turbine in the Belgian North Sea. It focuses on the vibration levels and modal parameters of the fundamental modes of the support structure. These parameters are crucial to minimize the operation and maintenance costs and to extend the lifetime of offshore wind turbine structure and mechanical systems. In order to perform a proper continuous monitoring during operation, a fast and reliable solution, applicable on an industrial scale, has been developed. It will be shown that the use of appropriate vibration measurement equipment together with state-of-the art operational modal analysis techniques can provide accurate estimates of natural frequencies, damping ratios, and mode shapes of offshore wind turbines. The identification methods have been automated and their reliability has been improved, so that the system can track small changes in the dynamic behavior of offshore wind turbines. The advanced modal analysis tools used in this application include the poly-reference least squares complex frequency-domain estimator, commercially known as PolyMAX, and the covariance-driven stochastic subspace identification method. The implemented processing strategy will be demonstrated on data continuously collected during 2 weeks, while the wind turbine was idling or parked.

scholarly journals Operational modal analysis and wavelet transformation for damage identification in wind turbine blades

2016 ◽  
Vol 15 (4) ◽  
pp. 381-388 ◽  
Author(s):  
Martin D Ulriksen ◽  
Dmitri Tcherniak ◽  
Poul H Kirkegaard ◽  
Lars Damkilde
Keyword(s):  
Wind Turbine ◽  
Modal Analysis ◽  
Wavelet Transformation ◽  
Damage Identification ◽  
Turbine Blades ◽  
Operational Modal Analysis ◽  
Wind Turbine Blades

Damage detection in wind turbine blades by using operational modal analysis

2016 ◽  
Vol 15 (3) ◽  
pp. 289-301 ◽  
Author(s):  
Emilio Di Lorenzo ◽  
Giuseppe Petrone ◽  
Simone Manzato ◽  
Bart Peeters ◽  
Wim Desmet ◽  
...  
Keyword(s):  
Damage Detection ◽  
Wind Turbine ◽  
Modal Analysis ◽  
Turbine Blades ◽  
Operational Modal Analysis ◽  
Wind Turbine Blades
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