Inspection and monitoring of wind turbine blade-embedded wave defects during fatigue testing

Niezrecki, Christopher; Avitabile, Peter; Chen, Julie; Sherwood, James A.; Lundstrom, Troy; LeBlanc, Bruce; Hughes, Scott; Desmond, Michael; Beattie, A.G.; Rumsey, Mark A; Klute, Sandra; Pedrazzani, Renee; Werlink, Rudy; Newman, John W.

doi:10.1177/1475921714532995

Cited by 50 publications

(43 citation statements)

References 7 publications

(7 reference statements)

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“…[1][2][3][4][5][6][7][8][9][10][11] Some of these techniques uses coordinate machine measurements (CMM), 1 which is the most common and reliable measurement method of profile measurement of blades. In order to achieve maximum efficiency some shapes, dimensions and aerodynamic profiles are required for blades so manufacturing process of these parts requires quality inspection techniques.…”

Section: Introductionmentioning

confidence: 99%

“…Several authors describe different techniques that have been implemented for aerodynamic profiles measurements of wind turbine blades. [1][2][3][4][5][6][7][8][9][10][11] Some of these techniques uses coordinate machine measurements (CMM), 1 which is the most common and reliable measurement method of profile measurement of blades. This is the method with the highest measurement accuracy nowadays and has the advantage of completing precision measurement of the profile with complex structure.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of quality test of aerodynamic profiles in wind turbine blades using laser triangulation technique

Moreno‐Oliva¹,

Román‐Hernández²,

Dorrego-Portela³

et al. 2019

Energy Science & Engineering

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The development of an optical contact instrument for measuring the geometric shape of aerodynamic profiles on blades of small power wind turbines is presented. The instrument uses the triangulation principle, where a structured line laser pattern is projected onto the surface of one of the faces of the blade under test, a camera captures the image of the line and is processed to interpret the distorted form of the projected line. A linear sweep of the instrument makes it possible to measure the profile in another section of the blade. Comparison and evaluation results of two symmetric profiles of the NACA 0012 family are presented, one manufactured in a 3D printer and the other one is a metal profile AF104 of a subsonic wind tunnel. Additionally, three sections of a blade with profile FX 63‐137 of a 1.5 kW wind turbine were evaluated. An aerodynamic analysis shows a reduction in the lift coefficient and in the efficiency of the aerodynamic profile, as well as an increase in the drag coefficient. The sensitivity of the instrument is 0.1 mm on the Z‐axis.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Measurement of quality test of aerodynamic profiles in wind turbine blades using laser triangulation technique

Moreno‐Oliva¹,

Román‐Hernández²,

Dorrego-Portela³

et al. 2019

Energy Science & Engineering

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“…resonant frequencies, damping, mode shapes or operating deflection shapes (ODS), or other dynamic sensor signal features) [3]. That being said, experimental and operational modal analysis (EMA and OMA) are the two widely adopted techniques used in structural dynamics identification to extract features employed in vibration-based SHM and the corresponding decision-making procedure [3], as well as being used for model updating and model validation in several applications related to aerospace, civil and mechanical systems [11,12].…”

Section: Introductionmentioning

confidence: 99%

Vibration-based damage detection in wind turbine blades using Phase-based Motion Estimation and motion magnification

Sarrafi

Mao

Niezrecki

et al. 2018

Journal of Sound and Vibration

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192

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Vibration-based Structural Health Monitoring (SHM) techniques are among the most common approaches for structural damage identification. The presence of damage in structures may be identified by monitoring the changes in dynamic behavior subject to external loading, and is typically performed by using experimental modal analysis (EMA) or operational modal analysis (OMA). These tools for SHM normally require a limited number of physically attached transducers (e.g. accelerometers) in order to record the response of the structure for further analysis. Signal conditioners, wires, wireless receivers and a data acquisition system (DAQ) are also typical components of traditional sensing systems used in vibration-based SHM. However, instrumentation of lightweight structures with contact sensors such as accelerometers may induce mass-loading effects, and for large-scale structures, the instrumentation is labor intensive and time consuming. Achieving high spatial measurement resolution for a large-scale structure is not always feasible while working with traditional contact sensors, and there is also the potential for a lack of reliability associated with fixed contact sensors in outliving the life-span of the host structure. Among the state-of-the-art noncontact measurements, digital video cameras are able to rapidly collect high-density spatial information from structures remotely. In this paper, the subtle motions from recorded video (i.e. a sequence of images) are extracted by means of Phase-based Motion Estimation (PME) and the extracted information is used to conduct damage identification on a 2.3-meter long Skystream® wind turbine blade (WTB). The PME and phased-based motion magnification approach estimates the structural motion from the captured sequence of images for both a baseline and damaged test cases on a wind turbine blade. Operational deflection shapes of the test articles are also quantified and compared for the baseline and damaged states. In addition, having proper lighting while working with high-speed cameras can be an issue, therefore image enhancement and contrast manipulation has also been performed to enhance the raw images. Ultimately, the extracted resonant frequencies and operational deflection shapes are used to detect the presence of damage, demonstrating the feasibility of implementing non-contact video measurements to perform realistic structural damage detection.

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“…The damage should be understood as changes to the constitutive material and/or the geometric properties, including alterations to the boundary conditions and structural connectivity, which can adversely affect structural and power performance . Thus, several issues have been studied, eg, manufacturing process, fracture, fatigue, and adhesive joints . Although diverse turbine designs exist, currently the most common design is built in an upwind horizontal axis with three blades.…”

Section: Introductionmentioning

confidence: 99%

Prospective challenges in the experimentation of the rain erosion on the leading edge of wind turbine blades

Bartolomé

Teuwen

2018

Wind Energy

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Developments in the wind industry reveal intricate engineering challenges, one of them being the erosion on the leading edge of the wind turbine blades. In this review work, the main issues for the wind industry in the experimentation with respect to erosion are examined. After a historical and general overview of erosion, this review focuses on the rain erosion on the leading edge of the wind turbine blades giving prominence to (1) the rain simulations, (2) experimental erosion facilities, and (3) variables to characterise erosion. These three factors have to be improved to establish a research field enabling the prediction of erosion behaviour and providing useful information about how the rainfall affects the leading edge of the wind turbine blades. Moreover, these improvements in the experimentation of the erosion would be a first step to understand and predict the erosion damage of the wind turbine blades. Finally, this review work also will help to cope with experimental investigations and results in the rain erosion on the leading edge with a deeper critical thinking for future researchers.

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Inspection and monitoring of wind turbine blade-embedded wave defects during fatigue testing

Cited by 50 publications

References 7 publications

Measurement of quality test of aerodynamic profiles in wind turbine blades using laser triangulation technique

Measurement of quality test of aerodynamic profiles in wind turbine blades using laser triangulation technique

Vibration-based damage detection in wind turbine blades using Phase-based Motion Estimation and motion magnification

Prospective challenges in the experimentation of the rain erosion on the leading edge of wind turbine blades

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