Design Loads for Wind Turbines Using the Environmental Contour Method

Saranyasoontorn, Korn; Manuel, Lance

doi:10.1115/1.2346700

Cited by 56 publications

(10 citation statements)

References 17 publications

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“…Quantification and assessment of the structural reliability level of the wind turbine blade with respect to its strength, stiffness and elastic stability should be performed in probabilistic terms by relying both on load uncertainty quantification as well as on material, because of the use of composite materials, exhibiting great inherent variability of mechanical properties. Substantial efforts have been directed toward load uncertainty investigation, with results already incorporated in the relevant design standard IEC 61400‐1…”

Section: How To Predict the Strength And Failure Of Wind Turbine Bladesmentioning

confidence: 98%

Materials of large wind turbine blades: recent results in testing and modeling

et al. 2011

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The reliability of rotor blades is the pre‐condition for the development and wide use of large wind turbines. In order to accurately predict and improve the wind turbine blade behavior, three main aspects of the reliability and strength of rotor blades were considered: (i) development of methods for the experimental determination of reliable material properties used in the design of wind turbine blades and experimental validation of design models, (ii) development of predictive models for the life prediction, prediction of residual strength and failure probability of the blades and (iii) analysis of the effect of the microstructure of wind turbine blade composites on their strength and ways of microstructural optimization of the materials. By testing reference coupons, the effect of testing parameters (temperature and frequency) on the lifetime of blade composites was investigated, and the input data for advanced design of wind turbine blades were collected. For assessing the residual strength and stiffness of wind turbine blades subjected to irregular cyclic loads, a shell‐based finite element numerical methodology was developed, taking into account the non‐linear response of plies, and experimentally validated. Two methods of structural reliability estimation of the blade, which take into account the stochastic nature of the anisotropic material properties and loads, were developed on the basis of the response surface method and the Edgeworth expansion technique, respectively. The effects of fiber clustering, misalignments, interface properties and other factors on the strength and lifetime of the wind turbine blade materials were investigated in the micromechanical finite element simulations. The results described in this paper stem from the Rotor Structure and Materials task of the UPWIND project. Copyright © 2011 John Wiley & Sons, Ltd.

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Section: How To Predict the Strength And Failure Of Wind Turbine Bladesmentioning

confidence: 98%

Materials of large wind turbine blades: recent results in testing and modeling

et al. 2011

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“…The EC method, originally developed by Winterstein et al [3], has been used in long-term reliability analyses for HAWTs by Agarwal and Manuel [8], and by Saranyasoontorn and Manuel [9] [10]; some refinements were also presented in those studies to directly account for response variability using 3-D Inverse FORM, which is a generalized version of the EC method. Using Eqs.…”

Section: Table 3-environmental Random Variable Distribution Parametersmentioning

confidence: 99%

Loads and Motions for Utility-Scale Floating Offshore Wind Turbines Supported by Semi-Submersible Platforms

et al. 2015

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This study is focused on the long-term reliability analysis of loads and motions for a utility-scale floating offshore wind turbine supported by a semi-submersible platform situated in the North Sea. The floating wind turbine, which consists of a 5-MW 3-bladed rotor, is assumed to be mounted on the OC4 semi-submersible floating platform. The platform consists of a main column, three offset columns, a cross frame, and pontoons, deployed at a site with a water depth of approximately 200 meters. A mooring system consists of three catenary lines together with the turbine and platform completes the integrated system. Based on the metocean conditions characterizing the selected turbine site, a number of sea states are identified for which coupled-dynamics simulations are carried out using the aeroelastic computeraided engineering (CAE) tool for horizontal-axis wind turbines, FAST. Short-term turbine load and platform motion statistics are established for individual sea states that are analyzed. The long-term global performance analysis yields estimates of 50-year loads and platform motions that takes into consideration response statistics from the simulations as well as the metocean (wind-wave) data and distributions. This study seeks to assess long-term loads and motions associated with large utility-scale offshore wind turbines that might be deployed on floating platforms for planned offshore wind power development in the U.S.

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“…For example, load cases related to the hydrodynamic forces (i.e., waves and currents), subjected to the tower, along with the wind‐induced aerodynamic forces on the blades have to be calculated in case of offshore wind turbines. In order to describe the various load types, either deterministic or the more advanced probabilistic models have been applied in the literature (e.g.,), while reliability analysis has been also used to identify the failure rates of several wind turbine components as a means to draw up an efficient inspection and maintenance strategy (e.g.,).…”

Section: Introductionmentioning

confidence: 99%

Wind turbines and seismic hazard: a state-of-the-art review

2016

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Wind energy is a rapidly growing field of renewable energy and as such, intensive scientific and societal interest has been already attracted. Research on wind turbine structures has been mostly focused on the structural analysis, design and/or assessment of wind turbines mainly against normal (environmental) exposures while, so far, only marginal attention has been spent on considering extreme natural hazards that threat the reliability of the lifetime-oriented wind turbine's performance. Especially, recent installations of numerous wind turbines in earthquake prone areas worldwide (e.g., China, USA, India, Southern Europe and East Asia) highlight the necessity for thorough consideration of the seismic implications on these energy harnessing systems. Along these lines, this state-of-the-art paper presents a comparative survey of the published research relevant to the seismic analysis, design and assessment of wind turbines. Based on numerical simulation, either deterministic or probabilistic approaches are reviewed, since they have been adopted to investigate the sensitivity of wind turbines' structural capacity and reliability in earthquake-induced loading. The relevance of seismic hazard for wind turbines is further enlightened by available experimental studies, being also comprehensively reported through this paper. The main contribution of the study presented herein is to identify the key factors for wind turbines' seismic performance while important milestones for ongoing and future advancement are emphasized.

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Design Loads for Wind Turbines Using the Environmental Contour Method

Cited by 56 publications

References 17 publications

Materials of large wind turbine blades: recent results in testing and modeling

Materials of large wind turbine blades: recent results in testing and modeling

Loads and Motions for Utility-Scale Floating Offshore Wind Turbines Supported by Semi-Submersible Platforms

Wind turbines and seismic hazard: a state-of-the-art review

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