A key requirement in the description of the performance of a wave energy converter is how the efficiency of power capture changes with the properties of the sea. This paper examines the effect of two generic power transfer functions (PTF) on power production from six simulated wave spectra. These were chosen to represent a series of wind, wind-swell mixed and swell dominated seas. The spread in energy within the sea state as defined by a variety of bandwidth parameters was examined to determine if there was a correlation between the width of the transfer function and the sea bandwidth. It was found that, for the ‘constant’ height PTF, the bandwidth parameter Bb (calculated using zeroth, minus-one and minus-two spectral moments) provided the best correlation. Customary bandwidths ε and ν performed poorly. When the PTF was allowed to vary in height as well as width there was little improvement in correlation from the un-scaled results.

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