First-order aerodynamic and aeroelastic behavior of a single-blade installation setup

Gaunaa, Mac; Bergami, Leonardo; Guntur, Srinivas; Zahle, Frederik

doi:10.1088/1742-6596/524/1/012073

Cited by 8 publications

(12 citation statements)

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“…A i = ( r i + 1 − r i ) C i is the wing area, where C i is the chord length, and r i is the distance from the center of the i t h segment to the COG. The cross‐flow principle is applied to calculate the wind loads on the blade, and interested readers are referred to Ren et al for a verification using the HAWC2 numerical model. Simulation results in Ren et al has also proven the feasibility of the assumptions for Equation .…”

Section: Problem Formulationmentioning

confidence: 99%

“…The deck space is more efficiently used, and a crane vessel can carry more turbine components in a single trip. Nevertheless, single blade installation requires more offshore lifts than the assembled rotor approach, and it is limited to a mean wind speed of 8 to 12 m/s. Recently, both the research community and industry have made efforts to understand the physics of and to make improvements to the state‐of‐the‐art single blade installations.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, both the research community and industry have made efforts to understand the physics of and to make improvements to the state‐of‐the‐art single blade installations. The aerodynamics and aeroelastic behavior of a single blade at standstill are studied in other studies . In Jiang et al, the motion characteristics of a blade installation model are identified, and the critical parameters that influence the final blade installation stage are investigated.…”

Section: Introductionmentioning

confidence: 99%

“…The aerodynamics and aeroelastic behavior of a single blade at standstill are studied in other studies. [10][11][12][13] In Jiang et al, 14 the motion characteristics of a blade installation model are identified, and the critical parameters that influence the final blade installation stage are investigated. Meanwhile, specialized commercial products, such as LT575 Blade Dragon, 15 allow single blade installations to be conducted under higher wind speeds.…”

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confidence: 99%

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Active tugger line force control for single blade installation

et al. 2018

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Single blade installation is one of the methods for installing large wind turbine blades at an o shore site. During this installation, each blade is lifted by the main crane from the deck of an installation vessel or a transportation barge with blade root approaching the hub. The blade root is then bolted to the hub. The nal mating phase is critical and requires high precision. Tugger lines from the crane boom are connected to the suspended blade to reduce pendulum motions. The entire process is typically completed without active tugger line force control. Due to wind-induced blade loads, strict requirement on installation precision, and the limitations imposed by the lifting equipment, the single blade installation operations are subject to weather constraints. Therefore, developing techniques to reduce the blade motions and consequently shorten the installation time is desired. In this paper, an active control scheme is proposed to control the tugger line forces acting on a blade during the nal installation stage before mating. A simpli ed 3 degree-of-freedom blade installation model is developed for the control design. An extended Kalman lter is used to estimate the blade motions and wind velocities. Feedback linearization and pole placement techniques are applied for the design of the controller. Simulations under turbulent wind conditions are conducted to verify the active control scheme, which e ectively reduces the blade root motions in the wind direction.

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Section: Problem Formulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Active tugger line force control for single blade installation

et al. 2018

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“…The disadvantage is that this installation approach typically requires more operation time. Using state-of-the-art lift equipment, the single blade installation approach is only allowed to be conducted up to a mean wind speed of approximately 8 − 12 m/s at the hub height [4]. Hence, increasing the weather window for the installation work and making the lifting operation more time efficient will greatly reduce the installation costs.…”

Section: Introductionmentioning

confidence: 99%

Development and application of a simulator for offshore wind turbine blades installation

et al. 2018

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In an offshore environment, offshore wind energy resources are more available and stable, but the investment cost is much higher than that of onshore wind. The installation cost is a crucial factor of the investment. With the increasing number of planned and approved offshore wind farms, offshore wind turbine installation and relevant operations have received tremendous attention. Therefore, expediting the turbine-structure mating operations through a higher level of automation in offshore wind turbine installations may provide important economic benefits. To achieve a higher automation level and reduce the weather waiting time during the installation of offshore wind turbines, a flexible simulation-verification framework with high fidelity is needed. However, state-of-the-art wind turbine numerical analysis code is neither convenient nor open enough for applications concerning the design and verification of control algorithms. MATLAB/Simulink is among the most widely utilized numerical platforms by control engineers and researchers. This paper describes the development of a modularized blade installation simulation toolbox for the purpose of control design in MATLAB/Simulink. The toolbox can be used to simulate several blade installation configurations, both onshore and offshore. The paper presents the key features and equations of the different modules, exemplified by a single blade installation operation. Code-to-code verification results are presented and discussed with both quasi-steady wind and three-dimensional turbulent wind field.

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A parametric study on the final blade installation process for monopile wind turbines under rough environmental conditions

Jiang

Gao

Ren

et al. 2018

Engineering Structures

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ingle lde instlltion is method for instlling wind turine ldesF sf jkEup vessel is used during n oshore instlltionD the wind turine lde is minly sujeted to wind lods nd experienes resonnt motionsD nd the monopile is sujeted to wveEindued virtionsF he lde mting proess n e hllenging if lrge reltive motions our etween the lde root nd the monopile topF his study numerilly models lde instlltion system tht onsists of preEinstlled monopile nd nelle ssemlyD nd S w lde with tugger linesF fy nlyzing the ldeEroot nd the hu motion rdii from timeEdomin simultionsD we evlute the eets of men wind speedD wind turuleneD signint wve heightD wve spetrl pek periodD windEwve mislignmentD nd wter depth on the lde instlltionF por the lignment phseD the ldeEroot motion is ritilD espeilly when the men wind speed nd turulene re highF he hu motion n e importnt when the monopile resonnt responses re prominentF he reltive inEplne motions rther thn the hu or the lde motion lone should e onsidered during the ssessmentF por the mting phseD the highEfrequeny omponents of the responses re importnt in generlF feuse of the dominnt ngeEhole motions t the monopile topD n inrese in wter depth redues the suess rte of mtingF

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First-order aerodynamic and aeroelastic behavior of a single-blade installation setup

Cited by 8 publications

References 1 publication

Active tugger line force control for single blade installation

Active tugger line force control for single blade installation

Development and application of a simulator for offshore wind turbine blades installation

A parametric study on the final blade installation process for monopile wind turbines under rough environmental conditions

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