Coupled Dynamic Analysis of a Bottom-Fixed Elastic Platform with Wave Energy Converters in Random Waves

A Wavestar-type Wave Energy Converter (WEC) on an elastic foundation structure was investigated using an author-developed coupled dynamic analysis computer program. The program included an elastic foundation structure composed of beam elements, a multi-body dynamics model of the entire system, a hyd...

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Bibliographic Details
Published in:Applied sciences 2022-08, Vol.12 (15), p.7915
Main Authors: Heo, Sanghwan, Koo, Weoncheol, Kim, Moo-Hyun
Format: Article
Language:English
Subjects:
Algebra
Alternative energy sources
Case studies
Computer programs
Connecting rods
coupled dynamic analysis
Dynamic structural analysis
Elastic foundations
elastic structure
heaving point absorber
Hydrodynamics
Lagrange multiplier
multi-body dynamics/hydrodynamics
Multibody systems
Numerical analysis
Pressure distribution
random wave
Random waves
Renewable resources
Software
Wave energy
wave energy converter
Wave power
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Summary:A Wavestar-type Wave Energy Converter (WEC) on an elastic foundation structure was investigated using an author-developed coupled dynamic analysis computer program. The program included an elastic foundation structure composed of beam elements, a multi-body dynamics model of the entire system, a hydrodynamics model of the dual-buoy, and fully coupled dynamics considering the interaction between the structure and WECs. The selected WEC models a heaving-point-absorber (HPA), one of the oscillating body systems which causes rotational motions of a connecting rod attached to the foundation structure. A rotational-damper-type hydraulic power take-off (PTO) system on the foundation structure produced electricity. The bottom-fixed foundation structure was modeled by three-dimensional beam elements, and the entire system, including HPA, was analyzed by multi-body dynamics. Random wave data at Buan, a nearshore region of Korea, collected by the Korea Meteorological Administration (KMA), was used as a demonstration study using the developed computer programs. Through the case study, the displacement and stress of the foundation structure were increased significantly by the dynamic coupling effects with the WECs, which underscores that the coupled dynamic analysis is essential for a reliable performance evaluation and the design of such a system.
ISSN:2076-3417
2076-3417
DOI:10.3390/app12157915