Development and feasibility study of segment blade test methodology

Ha, Kwangtae; Bätge, Moritz; Melcher, David; Czichon, Steffen

doi:10.5194/wes-5-591-2020

Cited by 9 publications

(6 citation statements)

References 9 publications

(7 reference statements)

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“…It is thus crucial to develop a blade design that withstands all expected loads without damage. Though a blade prototype is always tested at the full blade scale in the certification process (International Eletrotechnical Comission, 2014), such tests are very costly and time-consuming, especially for growing blade dimensions (Ha et al, 2020). For this reason, full-scale blade tests are executed one time only per blade design.…”

Section: Introductionmentioning

confidence: 99%

Validation of a modeling methodology for wind turbine rotor blades based on a full-scale blade test

2022

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Abstract. Detailed 3D finite-element simulations are state of the art for structural analyses of wind turbine rotor blades. It is of utmost importance to validate the underlying modeling methodology in order to obtain reliable results. Validation of the global response can ideally be done by comparing simulations with full-scale blade tests. However, there is a lack of test results for which also the finite-element model with blade geometry and layup as well as the test documentation and results are completely available. The aim of this paper is to validate the presented fully parameterized blade modeling methodology that is implemented in an in-house model generator and to provide respective test results for validation purpose to the public. This methodology includes parameter definition based on splines for all design and material parameters, which enables fast and easy parameter analysis. A hybrid 3D shell/solid element model is created including the respective boundary conditions. The problem is solved via a commercially available finite-element code. A static full-scale blade test is performed, which is used as the validation reference. All information, e.g., on sensor location, displacement, and strains, is available to reproduce the tests. The tests comprise classical bending tests in flapwise and lead–lag directions according to IEC 61400-23 as well as torsion tests. For the validation of the modeling methodology, global blade characteristics from measurements and simulation are compared. These include the overall mass and center of gravity location, as well as their distributions along the blade, bending deflections, strain levels, and natural frequencies and modes. Overall, the global results meet the defined validation thresholds during bending, though some improvements are required for very local analysis and especially the response in torsion. As a conclusion, the modeling strategy can be rated as validated, though necessary improvements are highlighted for future works.

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Section: Introductionmentioning

confidence: 99%

Validation of a modeling methodology for wind turbine rotor blades based on a full-scale blade test

2022

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“…One way to reduce the test duration is to segment the blades, as described by Ha et al [3], i.e., cut the blade into two segments (root and tip) and test the segments separately. Since the segments can be tested simultaneously and the eigenfrequencies of the blade segments are much higher than the eigenfrequency of the full-length blade, the test duration can be reduced.…”

Section: Introductionmentioning

confidence: 99%

Potential of damage accumulation during segmented rotor blade fatigue tests

Melcher

Petersen

McInnes

2022

J. Phys.: Conf. Ser.

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Modern wind turbines have higher rated power and improved capacity factors. This results in very long and slender blades which are also designed closer to the material limits. As a consequence, blade test facilities need to be upgraded for static and fatigue full-scale blade testing to carry larger loads and deal with larger tip deflections. Another aspect is the adaption of the test methods to avoid high overloads, which can cause premature damage and require time-consuming repairs. One drawback of traditional full-scale tests with a full-length rotor blade is the long time needed for certification as the blades have low eigenfrequencies and hence high fatigue test durations. This work presents an alternative fatigue testing approach for rotor blades which combines full-length and segmented fatigue tests, each contributing to the accumulated fatigue damage. The proposed approach is benchmarked with the traditional approach by means of a numerical optimization study. applying this approach to a current offshore rotor blade design illustrates the potential for reducing the fatigue test duration by 66% and the local fatigue damage overload to a mere fraction.

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“…1, which lead to a preferable choice among other alternative renewable energy sources against fossil fuel energy [1][2][3][4]. With innovatively engineered designs of rotor blade airfoils and structures using recent powerful computational performance, wind turbines have been designed to extract wind energy as close as possible to the Betz limit, 59.3% [5][6][7][8][9][10][11][12]. Currently, total energy capacity of existing wind energy conversion system has grown from 23.9 in 2001 and to 591 GW in 2019, approximately 25 times increase has been achieved, and there is still a strong demand of wind power in alternative energy market, and even up to the total capacity of 1787 GW by 2030 with reduced LCOE along with improved technologies are expected [13].…”

Section: Introductionmentioning

confidence: 99%

Recent Control Technologies for Floating Offshore Wind Energy System: A Review

Truong

Dang

et al. 2020

Int. J. of Precis. Eng. and Manuf.-Green Tech.

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This paper presents the recent control technologies being researched for floating offshore wind energy system (FOWES). FOWES has been getting many attentions recently as an alternative energy system utilizing vast sustainable wind resource away from land with little restriction by human societies, artificial and natural obstacles. However, not only due to the harsh environmental conditions such as strong wind, wave, and current, but also due to the platform motions such as surge, sway, heave, pitch, roll, and yaw, there could occur many problems including less energy capture than expected, frequent emergency stops, turbine structural instability, and fatigues resulting in early failures, which stay the levelized cost of energy (LCOE) still high compared to conventional fixed offshore wind energy system. These risks could be lowered by operating the turbine close to the optimum point and harvesting wind energy efficiently even under strong wind conditions with the properly applied control technologies, while reducing the loads on structural components. Many researches have been actively going on not only by numerical approaches, but also by experimental tests. This study is wrapping the most recent researches on control technologies for promising floating offshore wind energy system according to different substructure designs such as a spar type, semi-submergible type, tension-leg platform (TLP) type, and barge type, and discusses about its challenges as well.

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Development and feasibility study of segment blade test methodology

Cited by 9 publications

References 9 publications

Validation of a modeling methodology for wind turbine rotor blades based on a full-scale blade test

Validation of a modeling methodology for wind turbine rotor blades based on a full-scale blade test

Potential of damage accumulation during segmented rotor blade fatigue tests

Recent Control Technologies for Floating Offshore Wind Energy System: A Review

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