Comparative study on motion and performance of a wave energy absorption oscillator in the sea and inside ships

Yao Liu, Weimin Chen, Xinshu Zhang, Guoxiang Dong and Yunlong Du

Energy, 2025, vol. 322, issue C

Abstract: This paper compares the motion characteristics and wave energy absorption performance of a cylindrical buoy in the sea with those of the same-size oscillator inside ships, in order to determine whether the inboard oscillator can offer superior performance. A mathematical model employing the boundary element method is established for two scenarios: an isolated oscillator and coupled motion of ship and inboard oscillator, under regular waves. A Python code is developed to solve the dynamic equations and validated against the experimental results. Considering variations in ship's scaling factors, forward speeds, spring stiffness, power take-off damping, wave periods, and wave directions, a comprehensive comparative study is performed. Results indicate that the inboard oscillator under low spring stiffness can attain a significantly higher response amplitude than the in-sea oscillator, demonstrating a larger amount of capturable kinetic energy. Under short waves, the oscillator inside a smaller and faster ship has superior performance. The performance can be further enhanced across a broad frequency band by aligning the natural period of the inboard oscillator with that of the ship. The maximized efficiency of inboard oscillator near its resonant period is more than twice that of the oscillator in the sea.

Keywords: Point absorber wave energy converter; Oscillator inside ships; Boundary element method; Power take-off system; Capture width ratio (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:322:y:2025:i:c:s0360544225012563

DOI: 10.1016/j.energy.2025.135614

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