分段式造波机生成波浪的方向谱分析
Directional spectrum analysis of waves generated with segmented wavemaker
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摘要: 采用声学多普勒流速仪(ADV)和多点测波仪的实验资料,对分段式造波机生成的多向随机波浪进行方向谱分析.结果表明,分段式造波机生成的多向随机波浪的时间平稳性优于空间均匀性;贝叶斯方法(BDM)适合于流速实验资料和阵列波浪资料的方向谱分析,给出的方向谱满足随机波浪的内禀性质(如光滑性、连续性等);流速资料和阵列波浪资料给出的方向谱具有相当的精度,但与测速的深度有关;三参量(如三点波浪、两个方向的速度分量和一点波浪等)可给出具有相当精度的方向谱;给出了衡量方向谱精度的初步标准.Abstract: The velocity data measured by the acoustic Doppler velocimeter (ADV) and the wave surface data measured by a wave gage array are used to analyse the directional spectrum of wave generated with a segmented wavemaker,The results show that (1) the steadiness of 3-D random waves in time domain is better than their homogeneity in spatial domain; (2) Bayesian approach (BDM) is available for directional spectrum analysis from velocity data and wave surface data; (3) the directional spectrum analysed from velocity data has the same accuracy as that analysed from wave surface data and (4) the directional spectrum with appropriate accuracy can be obtained from three wave parameters,such as three wave surfaces,two component velocities and one wave surface.The preliminary criterion for measuring the accuracy of directional spectrum analysis is proposed.
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