Variability of breaking wave characteristics and impact loads on offshore wind turbines supported by monopiles

Hallowell, Spencer T.; Myers, Andrew C.; Arwade, Sanjay R.

doi:10.1002/we.1833

Cited by 36 publications

(24 citation statements)

References 20 publications

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“…The performance of both approaches is evaluated using the data collected from a Vestas V66 2‐MW OWT structure located approximately 1 km from the coast of Blyth, northeast of England (Figure 1a). The average water depth is approximately 9 m, the hub height is 67.8 m above the mudline, and the blade diameter is 66 m. The OWT was instrumented with eight strain gauges at four levels between mean sea level (MSL) and mudline as shown in Figure 1b 31 . The strain gauges were calibrated using cable‐pull procedure 24 to measure the section bending moments in both side‐to‐side ( x ) and fore–aft ( y ) directions with sampling rate of 40 Hz 24 .…”

Section: Case Study Structure: a 2‐mw Owtmentioning

confidence: 99%

Mechanics‐based model updating for identification and virtual sensing of an offshore wind turbine using sparse measurements

Nabiyan

Khoshnoudian

Moaveni

et al. 2020

Struct Control Health Monit

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Section: Case Study Structure: a 2‐mw Owtmentioning

confidence: 99%

Mechanics‐based model updating for identification and virtual sensing of an offshore wind turbine using sparse measurements

Nabiyan

Khoshnoudian

Moaveni

et al. 2020

Struct Control Health Monit

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“…Slamming loads on cylinders can be predicted by a number of engineering models [3,4]. However, comparisons with experimental results [5] show that these models are quite sensitive on the modelling assumptions.…”

Section: Introductionmentioning

confidence: 99%

Extreme Wave Loads on Monopile Substructures: Precomputed Kinematics Coupled With the Pressure Impulse Slamming Load Model

Pierella

Ghadirian

Bredmose

2019

ASME 2019 2nd International Offshore Wind Technical Conference

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Monopiles are nowadays the preferred substructure type for bottom-fixed offshore wind turbines at shallow to intermediate water depths. At these locations, the large waves that contribute to extreme loads are strongly nonlinear. Therefore they are not easily reproduced via the simple engineering models who are commonly used in the offshore industry. In the current approach, we develop a design pattern which improves this standard methodology.To retain nonlinearity in the force computations, we have precomputed a number of wave realizations by means of a potential fully-nonlinear code (OceanWave3D), for a wide span of nondimensional water depths and significant wave heights. The designer can then extract a wave kinematics time series from the precomputed set, scale it by the Froude law, and couple it with a suitable force model to compute loads. To complete the picture, slamming loads are calculated by means of the so-called pressure impulse model, recently developed at DTU. Rather than computing the time series of the slamming load, the model uses a few parameters, all except one determinable from the incident wave to calculate the pressure impulse.First comparisons with experimental results, obtained in the framework of the DeRisk project, are promising. The force and the wave elevation statistics from the precomputed simulations show a good agreement with the experimental force and wave * Address all correspondence to this author. elevation signals. Some discrepancies are present, due to an imperfect scaling and to the differences in the physical and numerical domains. The computed loads from the slamming model match the experimental ones quite closely, once the wave celerity extracted by the precomputed kinematics is corrected by an ad-hoc factor.

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“…Many existing wind farms and wind farms under development are located in shallow water, characterized by a water depth less than 30 m. For these wind farms, the water depth is such that breaking or near-breaking waves will occur. Breaking waves occur when a wave becomes so steep that it becomes unstable, causing potentially large lateral forces on the offshore wind turbine (OWT), which, in some cases, can determine the design of the support structure [1,2].…”

Section: Introductionmentioning

confidence: 99%

Inverse estimation of breaking wave loads on monopile wind turbines

et al. 2018

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Breaking waves occur in shallow water and cause large forces on offshore wind turbines, which can determine the design of the support structure. Due to the strong nonlinearity and statistical variability of breaking waves, the corresponding loads used in the design are generally characterized by large uncertainty. This paper presents a validation of an inverse method to estimate breaking wave loads on offshore monopile wind turbines based on wave basin tests. The accelerations measured on a scale model of a monopile wind turbine are passed to a force identification algorithm together with a dynamic model of the structure in order to identify the wave loads. In addition, the member forces in the support structure are estimated. Both the wave loads and member forces are estimated with a reasonable accuracy. The proposed methodology creates opportunities for operational monitoring of offshore wind turbines, hereby providing essential information to improve design guidelines for future wind turbines and allowing for a continuous fatigue assessment of the wind turbine during the operation.

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Variability of breaking wave characteristics and impact loads on offshore wind turbines supported by monopiles

Cited by 36 publications

References 20 publications

Mechanics‐based model updating for identification and virtual sensing of an offshore wind turbine using sparse measurements

Mechanics‐based model updating for identification and virtual sensing of an offshore wind turbine using sparse measurements

Extreme Wave Loads on Monopile Substructures: Precomputed Kinematics Coupled With the Pressure Impulse Slamming Load Model

Inverse estimation of breaking wave loads on monopile wind turbines

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