Constrained non-linear waves for offshore wind turbine design

Rainey, Patrick; Camp, Tim

doi:10.1088/1742-6596/75/1/012067

Cited by 7 publications

(9 citation statements)

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“…The trough-to-trough period rather than the up-or down-crossing period was chosen because this type of wave is typically approximated by embedded stream function waves in design practices. The embedding process commonly uses the trough-to-trough period (Rainey and Camp, 2007).…”

Section: Maximum Responsesmentioning

confidence: 99%

Experimental results of a multimode monopile offshore wind turbine support structure subjected to steep and breaking irregular waves

et al. 2017

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We present experimental data from MARIN on a bottom-fixed offshore wind turbine mounted on a monopile in intermediate water depth subjected to severe irregular wave conditions. Two models are analysed: the first model is fully flexible and its 1 st and 2 nd eigenfrequencies and 1 st mode shape are representative of those of a full-scale turbine.This model is used to study the structural response with special focus on ringing and response to breaking wave events.The second model is stiff and is used to analyse the hydrodynamic excitation loads, in particular the so-called secondary load cycle. The largest responses are registered when the second mode of the structure is triggered by a breaking wave on top of a ringing response. In such events, the quasi-static response accounts for between 40 and 50% of the total load, the 1 st mode response between 30 and 40%, and the 2 nd mode response up to 20%. A statistical analysis on the occurrences and characteristics of the secondary load cycle shows that this phenomenon is not directly linked to ringing.

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Section: Maximum Responsesmentioning

confidence: 99%

Experimental results of a multimode monopile offshore wind turbine support structure subjected to steep and breaking irregular waves

et al. 2017

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“…This extreme wave is embedded into the 50 year irregular sea state using a constrained nonlinear Stream function wave of 20th order, as illustrated in Figure 11 (right) and described in Rainey and Camp. 45 These DLCs have been used with the load and resistance factor design (LRD) approach. 18 In addition to the IEC DLCs, properties for each phase of the BSH storm are shown in Table 5, which are simulated with partial safety factors set to 1.…”

Section: Design Load Casesmentioning

confidence: 99%

Influence of soil plasticity models on offshore wind turbine response

Ryan,

Adcock,

McAdam

2023

Wind Energy

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While recent numerical modelling advances have enabled robust simulation of foundation hysteresis behaviour, uptake of these models has been limited in the offshore wind industry. This is partially due to modelling complexity and the unknown influence of including such soil constitutive models within a design philosophy. This paper addresses this issue by outlining a framework of an aero‐hydro‐servo‐elastic offshore wind turbine model that is fully coupled with a multisurface plasticity 1D Winkler foundation model. Comparisons between this model and industry standard aeroelastic tools, such as OpenFAST, are shown to be in good agreement. The hysteretic soil predictions are also shown to be in good agreement with CM6 Cowden PISA test piles, in terms of secant stiffness and loop shape. This tool has then been used to address the unknown influence of hysteretic soil reactions on the design of monopile supported offshore wind turbines against extreme conditions. This study demonstrates that a significant reduction in ultimate and service limit state utilization is observed when a multisurface plasticity foundation model is adopted, as opposed to industry standard pile–soil interaction models.

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“…Other wave theories are not detailed here. The relatively new approach that allows for embedding an extreme wave into an irregular sea state is not included in the table. Methods based on potential flow are implemented in a few tools.…”

Section: Aero‐hydro‐servo‐elastic Tools For Offshore Wind Turbine Simmentioning

confidence: 99%

Offshore wind turbine environment, loads, simulation, and design

Vorpahl

Schwarze

Fischer

et al. 2012

WIREs Energy & Environment

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In the design, certification, and optimization of offshore wind turbines, extensive loads simulation is inevitable to develop reliable and cost-effective turbines. Description of the marine environment is based on a variety of techniques taking the stochastic nature of both, the wind and the water waves into account. The wind turbine is a highly dynamic system including effects of heavy rotating machinery and other significant nonlinearities leading to static, cyclic, transient, and stochastic loads. Due to the nature of the external loading, the system properties and the turbine design lifetime, offshore wind turbines are prone to fatigue-driven failure. For loads assessment, aero-hydro-servo-elastic tools are used including the coupled effects of the environment and the turbine to simulate the overall lifetime of the turbine in the harsh marine environment. These tools are constantly further developed and adapted to the needs of a fast-growing industry and newly arisi ng turbine concepts. Engineering approaches to allow for certification and reliable design are summarized in extensive guidelines and standards supporting engineers in daily design work

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Constrained non-linear waves for offshore wind turbine design

Cited by 7 publications

References 0 publications

Experimental results of a multimode monopile offshore wind turbine support structure subjected to steep and breaking irregular waves

Experimental results of a multimode monopile offshore wind turbine support structure subjected to steep and breaking irregular waves

Influence of soil plasticity models on offshore wind turbine response

Offshore wind turbine environment, loads, simulation, and design

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