Optimization of composite material tower for offshore wind turbine structures

O'Leary, Kieran; Pakrashi, Vikram; Kelliher, Denis

doi:10.1016/j.renene.2019.03.101

Cited by 46 publications

(17 citation statements)

References 38 publications

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“…One of the aims of the model test is to represent these load effects appropriately in the scaled model tests. This constitutes one of the important steps in the scaled model testing [6], including aspects such as new materials [7], site-specific estimates [8], and future monitoring strategies [9]. The readers are referred to further details of physical modelling in general and its applicability in [6].…”

Section: Foundations For Offshore Wind Turbines: Complexity In Analysis and Designmentioning

confidence: 99%

Physical Modelling of Offshore Wind Turbine Foundations for TRL (Technology Readiness Level) Studies

Bhattacharya

Lombardi

Amani

et al. 2021

JMSE

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Offshore wind turbines are a complex, dynamically sensitive structure due to their irregular mass and stiffness distribution, and complexity of the loading conditions they need to withstand. There are other challenges in particular locations such as typhoons, hurricanes, earthquakes, sea-bed currents, and tsunami. Because offshore wind turbines have stringent Serviceability Limit State (SLS) requirements and need to be installed in variable and often complex ground conditions, their foundation design is challenging. Foundation design must be robust due to the enormous cost of retrofitting in a challenging environment should any problem occur during the design lifetime. Traditionally, engineers use conventional types of foundation systems, such as shallow gravity-based foundations (GBF), suction caissons, or slender piles or monopiles, based on prior experience with designing such foundations for the oil and gas industry. For offshore wind turbines, however, new types of foundations are being considered for which neither prior experience nor guidelines exist. One of the major challenges is to develop a method to de-risk the life cycle of offshore wind turbines in diverse metocean and geological conditions. The paper, therefore, has the following aims: (a) provide an overview of the complexities and the common SLS performance requirements for offshore wind turbine; (b) discuss the use of physical modelling for verification and validation of innovative design concepts, taking into account all possible angles to de-risk the project; and (c) provide examples of applications in scaled model tests.

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Section: Foundations For Offshore Wind Turbines: Complexity In Analysis and Designmentioning

confidence: 99%

Physical Modelling of Offshore Wind Turbine Foundations for TRL (Technology Readiness Level) Studies

Bhattacharya

Lombardi

Amani

et al. 2021

JMSE

Self Cite

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“…They concluded that their presented approach is applicable for weight optimization of wind turbine towers. O'Leary et al [15] studied a mass optimized composite tower design for the national renewable energy laboratory 5 MW reference wind turbine and the application of lightweight fiber reinforced composite materials in the construction of offshore wind turbine support structures; it was found that a single wall composite tower resulted in lowest estimated costs. Dimopoulos and Gantes [16] studied the efficacy of various stiffeners of the wind turbine tower with a manhole cutout in the vicinity of the tower base.…”

Section: Introductionmentioning

confidence: 99%

Study of the Bearing Capacity of Stiffened Tall Offshore Wind Turbine Towers during the Erection Phase

Yang

Baniotopoulos

2020

Energies

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Offshore wind energy is a rapidly maturing renewable energy technology that is poised to play an important role in future energy systems. The respective advances refer among others to the monopile foundation that is frequently used to support wind turbines in the marine environment. In the present research paper, the structural response of tall wind energy converters with various stiffening schemes is studied during the erection phase as the latter are manufactured in modules that are assembled in situ. Rings, vertical stiffeners, T-shaped stiffeners and orthogonal stiffeners are considered efficient stiffening schemes to strengthen the tower structures. The loading bearing capacity of offshore monopile wind turbine towers with the four types of stiffeners were modeled numerically by means of finite elements. Applying a nonlinear buckling analysis, the ultimate bearing capacity of wind turbine towers with four standard stiffening schemes were compared in order to obtain the optimum stiffening option.

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“…Composite towers are being widely used in power systems due to their excellent insulation and mechanical properties [1–3 ]. However, there is a partial arc near metal joints on composite towers under wet polluted conditions [4 ].…”

Section: Introductionmentioning

confidence: 99%

Study on dry band discharge of wet polluted surface with float potential metal by electro-thermal synchronous observation

Lan

Wang

et al. 2020

IET Science, Measurement &Amp; Technology

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Severe partial arc occurred near metal bolts on the composite tower under wet pollution conditions, which had a close relationship with the temperature distribution on the surface. Artificial contamination tests on the small‐sized composite plate were carried out. Temperature distribution and leakage current variation of the specimen were acquired synchronously. The effects of float potential metal, pollution layer width, metal shape, and moisture on temperature distribution, dry band formation, and discharge phenomenon were studied by a series of comparative experiments. The results show that the float potential metal makes the temperature distribution of the pollution layer more concentrated. The dry band begins to form in the region with the highest temperature. The formation of a dry band on the narrow pollution layer is faster. The temperature of the dry band endpoint is very high and increases with the extension of the dry band. The formation and passing through of dry band blocks leakage current leading to the occurrence of partial arc. Temperature distribution near metals with sharp shapes is more inhomogeneous. In a humid environment, dry band arc can exist stably and develop to float potential metal. Owing to the rewetting of the dry band, dry band formation, and dry band arc will occur repeatedly.

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Optimization of composite material tower for offshore wind turbine structures

Cited by 46 publications

References 38 publications

Physical Modelling of Offshore Wind Turbine Foundations for TRL (Technology Readiness Level) Studies

Physical Modelling of Offshore Wind Turbine Foundations for TRL (Technology Readiness Level) Studies

Study of the Bearing Capacity of Stiffened Tall Offshore Wind Turbine Towers during the Erection Phase

Study on dry band discharge of wet polluted surface with float potential metal by electro-thermal synchronous observation

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