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A novel Geno-fuzzy based model for hydrodynamic efficiency prediction of a land-fixed oscillating water column for various front wall openings, power take-off dampings and incident wave steepnesses

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  • Altunkaynak, Abdüsselam
  • Çelik, Anıl

Abstract

Accurate efficiency estimation of a wave energy converter (WEC) is a key concept in the design stage. Oscillating water column (OWC) is a promising type of WEC due to its advantages such as proved concept, operational simplicity, accessibility, reliability etc. In this study, for accurate efficiency estimation of an OWC, a novel Geno-fuzzy based model (GENOFIS) was developed, firstly, by improving Adaptive Neuro-Fuzzy inference system (ANFIS) and secondly, incorporating the Genetic algorithms (GAs). Data for training and testing phases of the models were obtained from an extensive wave flume experiments for various OWC underwater opening heights and applied PTO dampings under different incident waves. Both models performed remarkably with a slightly better performance of GENOFIS. The superiority of the GENOFIS model stemmed from that its high performance was attained with substantially low fuzzy rules (only three) where ANFIS required incomparably large fuzzy rules (twenty-seven) and yet achieved a slightly lower performance. Accordingly, very few numbers of fuzzy rules enable the construction of GENOFIS model structure with low complexity, which, in turn, immensely reduce the computational time required. Developed less complicated GENOFIS model is parsimonious, unlikely to suffer from overfitting and has high interpretability and practicality.

Suggested Citation

  • Altunkaynak, Abdüsselam & Çelik, Anıl, 2022. "A novel Geno-fuzzy based model for hydrodynamic efficiency prediction of a land-fixed oscillating water column for various front wall openings, power take-off dampings and incident wave steepnesses," Renewable Energy, Elsevier, vol. 196(C), pages 99-110.
    • Handle: RePEc:eee:renene:v:196:y:2022:i:c:p:99-110
    DOI: 10.1016/j.renene.2022.06.045
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    References listed on IDEAS

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    1. Ning, De-Zhi & Wang, Rong-Quan & Zou, Qing-Ping & Teng, Bin, 2016. "An experimental investigation of hydrodynamics of a fixed OWC Wave Energy Converter," Applied Energy, Elsevier, vol. 168(C), pages 636-648.
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    3. Medina Rodríguez, Ayrton Alfonso & Silva Casarín, Rodolfo & Blanco Ilzarbe, Jesús María, 2022. "The influence of oblique waves on the hydrodynamic efficiency of an onshore OWC wave energy converter," Renewable Energy, Elsevier, vol. 183(C), pages 687-707.
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    5. Penalba, Markel & Giorgi, Giussepe & Ringwood, John V., 2017. "Mathematical modelling of wave energy converters: A review of nonlinear approaches," Renewable and Sustainable Energy Reviews, Elsevier, vol. 78(C), pages 1188-1207.
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    2. Abad, Farhad & Lotfian, Saeid & Dai, Saishuai & Zhao, Guangwei & Alarcon, Guillermo Idarraga & Yang, Liu & Huang, Yang & Xiao, Qing & Brennan, Feargal, 2024. "Experimental and computational analysis of elastomer membranes used in oscillating water column WECs," Renewable Energy, Elsevier, vol. 226(C).

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