Response of a Small Array due to Irregular Waves: Comparison to Predictions Based on Measured Regular Wave Response

摘要

Many studies have been published concerning numerical predictions ofrnwave energy device and array responses in both idealised and realisticrnwave-fields. However, there are few comparisons of predicted arrayrnresponse to experimental measurements, particularly for irregularrnwaves. Although time domain models are widely used for modellingrnthe behaviour of isolated devices, the response of arrays has typicallyrnbeen predicted by assuming linear superposition of steady-staternresponse to regular waves. In this experimental study, the validity ofrnapproaches based on linear theory is investigated for an isolated devicernand array of two devices at 4- and 3-radius centre-to-centre spacing. Arnrange of regular wave frequencies over which response is linear withrnwave height is identified and these response measurements are used tornpredict time-varying response to an irregular wave. In irregular waves,rnthe influence of previous wave cycles, the time required for the devicernto reach a steady response state and the short-term characteristics of thernwave-field affect device response.