Floating Wind Turbine Model Test to Verify a <scp>moordyn</scp> Modification for Nonlinear Elastic Materials

West, William; Goupee, Andrew J.; Allen, C.K.; Viselli, Anthony M.

doi:10.1115/1.4052935

Cited by 2 publications

(2 citation statements)

References 11 publications

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“…Synthetic lines exhibit a nonlinear tension-strain response that is important to account for when designing a system. A modified version of OpenFAST that has been validated against experimental data is used to incorporate the nonlinear behavior [18]. In this modified version of OpenFAST a general line tension strain response can be input into the model via a lookup table.…”

Section: Mooring Systemmentioning

confidence: 99%

Development of a Multi-Objective Optimization Tool for Screening Designs of Taut Synthetic Mooring Systems to Minimize Mooring Component Cost and Footprint

et al. 2021

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As the offshore wind industry develops, more lease sites in the intermediate water depth (50–85 m) are being released to developers. In these water depths floating wind turbines with chain catenary systems and fixed-bottom turbines with jacketed structures become cost prohibitive. As such, industry and researchers have shifted focus to floating turbines with taut or semi-taut synthetic rope mooring systems. In addition to reducing the cost of the mooring systems, synthetic systems can also reduce the footprint compared to a chain catenary system which frees areas around the turbine for other maritime uses such as commercial fishing. Both the mooring systems component cost and footprint are pertinent design criteria that lend themselves naturally to a multi-objective optimization routine. In this paper a new approach for efficiently screening the design space for plausible mooring systems that balance component cost and footprint using a multi-objective genetic algorithm is presented. This method uses a tiered-constraint method to avoid performing computationally expensive time domain simulations of mooring system designs that are infeasible. Performance metrics for assessing the constraints of candidate designs are performed using open-source software such as Mooring Analysis Program (MAP++), OpenFAST and MoorDyn. A case study is presented providing a Pareto-optimal design front for a taut synthetic mooring system of a 6-MW floating offshore wind turbine.

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Section: Mooring Systemmentioning

confidence: 99%

Development of a Multi-Objective Optimization Tool for Screening Designs of Taut Synthetic Mooring Systems to Minimize Mooring Component Cost and Footprint

et al. 2021

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“…The updated version of MoorDyn will help address these emerging needs. West et al [26] modified MoorDyn to allow the addition of nonlinear elastic mooring materials in OpenFAST and compared the numerical results with the 1:52 scale test data of an FOWT to validate the updated MoorDyn.…”

Section: Introductionmentioning

confidence: 99%

Effects of Mooring Line with Different Materials on the Dynamic Response of Offshore Floating Wind Turbine

Lian,

Zhong,

Zheng

et al. 2023

JMSE

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The influence of mooring systems with lines of different material on the dynamic response of a floating wind turbine is studied using a 5 MW OC4-DeepCwind semi-submersible wind turbine as a representative prototype in this study. Two types of mooring systems were designed using the MoorDyn module in OpenFAST software (v3.1.0): one uses chains, and the other uses a hybrid mooring line composed of chains and high-strength polyethylene (HMPE) ropes. A wind turbine with two types of mooring systems was simulated using the OpenFAST software. The results show that the floating wind turbine moored with the hybrid lines exhibited a larger heave and pitch motion than that moored using chains alone. At the same time, the surge displacement was smaller than that of the wind turbine using chains alone. In terms of mooring line tension, the mean and amplitude values of the hybrid mooring system at the location examined were smaller than those of the chain mooring system. Thus, using HMPE ropes in the mooring system can significantly reduce line loads. In addition, the HMPE ropes used in the floating wind turbine mooring system did not affect the power generation of the wind turbine. This study provides promising support data and observations for applying high-strength polyethylene (HMPE) ropes in mooring systems for floating wind turbines.

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Floating Wind Turbine Model Test to Verify a moordyn Modification for Nonlinear Elastic Materials

Cited by 2 publications

References 11 publications

Development of a Multi-Objective Optimization Tool for Screening Designs of Taut Synthetic Mooring Systems to Minimize Mooring Component Cost and Footprint

Development of a Multi-Objective Optimization Tool for Screening Designs of Taut Synthetic Mooring Systems to Minimize Mooring Component Cost and Footprint

Effects of Mooring Line with Different Materials on the Dynamic Response of Offshore Floating Wind Turbine

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