Experimental investigation on the wave-oscillating buoy interaction and wave run-up on the buoy

Yu, Tongshun; Li, Tingyu; Shi, Hongda; Zhang, Zhenyu; Chen, Xingyu

doi:10.1016/j.oceaneng.2023.113631

Cited by 4 publications

(1 citation statement)

References 29 publications

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“…The results illustrate pronounced nonlinear behaviour that influences its resonance when the PTO system is optimized for energy extraction. Yu et al [14] investigated the nonlinear wave run-up phenomenon of point-absorber devices by incrementally increasing the linear PTO load and decreasing the wave period. The results indicate that the PTO system has a notable impact on the wave run-up in front of the buoy.…”

Section: Introductionmentioning

confidence: 99%

Experimental and CFD Assessment of Harmonic Characteristics of Point-Absorber Wave-Energy Converters with Nonlinear Power Take-Off System

Yi,

Sun,

Liu

et al. 2023

JMSE

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The wave-energy excitation of point absorbers is highly associated with their resonant movement, and harmonic characteristics are of increasing concern in affecting resonance. However, the commonly used linearized power take-off (PTO) systems underestimate the impact of harmonics. The purpose of this study is to address the knowledge gap in assessing the contribution of hydraulic PTO systems to higher harmonic wave loads and velocities. In the present work, higher harmonics in point-absorber wave-energy converters (PA-WECs) with hydraulic power take-off (PTO) systems are investigated through both experimental and computational fluid dynamics (CFD) methods. The fast Fourier transform is used to decompose the high-order harmonics. To account for the influence of nonlinear wave–wave interaction on harmonics, the isolated PA-WEC is used as a basis for comparison with the paired PA-WECs. The influence of wave steepness is also estimated at two resonance periods. Results indicate that the additional resonance of the paired PA-WECs may be attributed to the harmonic wave loads at longer wave periods. Harmonic wave loads of paired PA-WECs typically have a more substantial impact and increase more rapidly with increasing wave steepness compared to isolated PA-WECs. Furthermore, as the wave steepness increases, there are significant enhancements in both the harmonic wave loads and heaving velocity, which strongly correlate with the instantaneous maximum hydraulic power. Consequently, our study will contribute to enhancing the maximum power output in the design of future point absorber arrays.

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Section: Introductionmentioning

confidence: 99%