Towers for Offshore Wind Turbines

Kurian, V.J.; Potty, Narayanan Sambu; Ganapathy, C.

doi:10.1063/1.3464894

Cited by 9 publications

(6 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Incidents of severe corrosion in steel reinforcement and steel prestressing tendons have been reported in structural applications such as bridges (Lynch 2012), off-shore structures including wind turbines (Kurian et al 2009) and even power stations (Guimaraes and Burgoyne 1987). These problems can be the result of a poor structural design or construction deficiencies that enable corrosive materials, such as water and deicing salts, to come into direct contact with the steel.…”

Section: Introductionmentioning

confidence: 99%

Bond Durability of Carbon Fiber–Reinforced Polymer Tendons Embedded in High-Strength Concrete

2018

View full text Add to dashboard Cite

The structural performance of Carbon Fibre Reinforced Polymer (CFRP) pretensioned structures is controlled by the bond between the CFRP tendons and concrete. The bond strength of CFRP sand-coated tendons can be affected by humid environments due to the porous epoxy matrix structure or by defects in the external sand coating layer of CFRP tendons e.g. due to storage conditions. Pull-out tests were carried out to assess the bond strength performance of sand-coated tendons embedded in high strength concrete and immersed in water at either 23°C or 40°C. Sand-coated CFRP tendons with two different core diameters of either 4.2 mm or 5.4 mm were studied. To assess the effect of the sand coating coverage on the bond, half sand-coated and uncoated tendons were also tested. An image processing technique was developed to help correlate bond strength variations with variations in the sand coating. An average difference of 24% between the bond strengths of the half sand-coated and full sand-coated tendons was recorded. A large scatter in the pull-out results for the sand-coated tendons of diameter 5.4 mm was observed and this was attributed to the manufacturing process. There was no clear trend of bond strength degradation in the sand-coated tendons even after roughly 1.5 years of full immersion in water irrespective of the exposure temperature. However, an increase in the bond strength of the uncoated tendons

show abstract

Section: Introductionmentioning

confidence: 99%

Bond Durability of Carbon Fiber–Reinforced Polymer Tendons Embedded in High-Strength Concrete

2018

View full text Add to dashboard Cite

show abstract

“…Because the energy produced from the wind is directly proportional to the cube of wind speed, increased wind speeds of only a few miles per hour can produce a significantly larger amount of electricity. For instance, a turbine at a site with an average wind speed of 26 km/h would produce 50% more electricity than that at a site with the same turbine and an average wind speed of 22 km/h (Kurian et al 2009).…”

Section: Description Of Offshore Wind Power Turbinesmentioning

confidence: 99%

Multi-Person Selection of the Best Wind Turbine Based on the Multi-Criteria Integrated Additive-Multiplicative Utility Function

Bagočius

Zavadskas

Turskis

2014

Journal of Civil Engineering and Management

View full text Add to dashboard Cite

Energy generation and savings is a vital problem for the social and economic development of a modern world. The construction of wind farms is a challenge of crucial importance to Lithuania. Offshore wind farms are one of the possibilities of the multiple use of marine space. Wind energy industry has become the fastest growing renewable energy in the world. An offshore wind farm is considered one of the most promising sources of green energy towards meeting the EU targets for 2020 and 2050. They provide long-term green energy production. The major purpose of this study is the selection and ranking of the feasible location areas of wind farms and assessing the types of wind turbines in the Baltic Sea offshore area. Multi-criteria decision making methods represent a robust and flexible tool investigating and assessing possible discrete alternatives evaluated applying the aggregated WSM and WPM method namely WASPAS. The following criteria such as the nominal power of the wind turbine, max power generated in the area, the amount of energy per year generated in the area, investments and CO2 emissions have been taken into consideration.

show abstract

“…Among the variety of clean sources of energy, offshore wind power is the sector that has grown significantly over the last decades [1]. In contrast with onshore applications, offshore wind energy present significant advantages, such as the lower risk for human life, fewer space constraints, less turbulent winds, and wind availability at higher speeds [2]. Despite the associated benefits of offshore wind energy, the overall cost of the projects is higher than for the onshore counterparts.…”

Section: Introductionmentioning

confidence: 99%

“…As seen in the literature, a significant number of studies which are primarily focused on the behavior of monopilefoundations are found in comparison with other substructures. In 2 © 2019 by ASME fact, monopiles are the most utilized OWT foundation type in shallow waters, (i.e., less than 30 meters depth) due to their simplicity in terms of manufacturing, installation, and deinstallation [2], [6]. The majority of the current models of monopile foundations rely on studies developed essentially for monopiles substructures designed for either oil or gas offshore platforms [7], [8].…”

Section: Introductionmentioning

confidence: 99%

Probabilistic Design and Uncertainty Quantification of the Structure of a Monopile Offshore Wind Turbine

Nispel

Ekwaro-Osire

Dias

et al. 2019

Volume 13: Safety Engineering, Risk, and Reliability Analysis

View full text Add to dashboard Cite

Despite the increasing demand for offshore energy, structural components of offshore wind turbines (OWT), such as the tower and foundation, are considered the most critical parts of the turbine. In fact, uncertainties regarding load conditions, soil and structural properties highly undermine the OWT structural reliability. In this scenario, in order to obtain more accurate results, rigorous probabilistic analyses are necessary. In this study, a probabilistic analysis of the dynamic response of a monopile OWT is conducted by using a systematic uncertainty quantification (UQ) framework to deal with the uncertainty assessment of the model input parameters. The proposed dynamic model computes the dynamic response of the turbine due to wind and waves loads on the monopile structure utilizing a simple cantilever beam analytical model. The distributions of the model input parameters are determined using (1) nonparametric statistics for a large dataset, and (2) the maximum entropy principle for a small dataset. Monte Carlo simulations are performed to propagate the uncertainties of the model inputs and to determine the system reliability expressed in terms of their probability of failure for the serviceability limit state design criterion. Finally, to demonstrate the shortcomings of traditional approaches that assume standard distributions to model uncertainties, a UQ approach modeling the uncertainties of the parameters using normal distributions is contrasted with our framework. From the results, significant differences between the distribution shape and values of the probability of failure can be observed; thus, it demonstrates the importance of developing probabilistic frameworks with systematic UQ to have more realistic approximations of the reliability of the OWT structure.

show abstract

Towers for Offshore Wind Turbines

Cited by 9 publications

References 4 publications

Bond Durability of Carbon Fiber–Reinforced Polymer Tendons Embedded in High-Strength Concrete

Bond Durability of Carbon Fiber–Reinforced Polymer Tendons Embedded in High-Strength Concrete

Multi-Person Selection of the Best Wind Turbine Based on the Multi-Criteria Integrated Additive-Multiplicative Utility Function

Probabilistic Design and Uncertainty Quantification of the Structure of a Monopile Offshore Wind Turbine

Contact Info

Product

Resources

About