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Liu, H.; Ao, J.; Chen, H; Liu, M.; Collu, M., and Liu, J., 2018. Performance analysis of a sea javelin wave energy converter in irregular wave. In: Liu, Z.L. and Mi, C. (eds.), Advances in Sustainable Port and Ocean Engineering. Journal of Coastal Research, Special Issue No. 83, pp. 932–940. Coconut Creek (Florida), ISSN 0749-0208. Wave energy, as a kind of eco-friendly energy due to its wide distribution and high energy density, has become a hot research topic at home and abroad and is likely to become a new industry in the future. In this article, we adopt a sea javelin wave energy converter (SJ-WEC) which is a floating vertical axisymmetric buoy. At first, semi-analytical solution of SJ-WEC is studied using eigen-function in frequency domain. Then, wave force and hydrodynamic coefficients of frequency domain can be applied into impulse response function (IRF) method to obtain motion and power of SJ-WEC. In the end, we can select ISSC wave spectrum and JONSWAP wave spectrum to represent the irregular wave to apply into IRF method. It is shown and confirmed that the motion and power which are calculated by IRF method are the same as the frequency domain method's so that the results of irregular waves can be confirmed it accurate. The IRF method is applied to the computation of irregular waves in time domain to simulate the real situation in actual sea conditions which are random and irregular. [ABSTRACT FROM AUTHOR]

An oscillating hydrofoil-wave energy conversion device was developed to address the challenge of self-supply for ocean vehicles by harnessing wave energy for electricity generation. This study focuses on the numerical simulation of the device’s hydrodynamic characteristics and energy capture performance. The paper begins by establishing a hydrodynamic numerical analysis model using CFD technology for the multi-body hinged system. The hydrodynamic characteristics of this system are examined under various wave conditions. Subsequently, an energy conversion model for the multi-body hinged system, considering a nonlinear power take-off (PTO) system, is established through an equivalent damping simulation method. This model is used to investigate the power generation performance and energy conversion efficiency of the cylindrically oscillating hydrofoil multi-body hinged system under different damping coefficients and wave conditions. The research findings indicate that the motion characteristics and wave energy capture efficiency of the hydrofoil are significantly influenced by the wave height, period, and damping coefficient of the PTO system. In addition, there are differences in energy harvesting effect between front and rear oscillating hydrofoils. The maximum power generation efficiency achieved by the oscillating hydrofoil-wave energy conversion device reaches 21.68%, with an anticipated peak power output of 1.84 kW under real sea conditions. [ABSTRACT FROM AUTHOR]