表面波引起的水底压力脉动

Pressure Fluctuations on Sea Bottom Caused by Surface Wave

依据研制的表面波和水底压力联合测量系统 ,对舰船兴波、规则波、非规则波和舰船在波浪中航行的水面波形以及它们在水底引起的压力脉动进行了测量 ,初步分析了表面波与水底压力脉动之间的关系 .实验结果表明 ,规则波与水底压力变化曲线峰谷对应 ,规则波引起的水底压力脉动与理论计算结果一致 ;非规则波在水底引起的压力变化频率降低、周期变长 ,两者之间的峰谷对应并非完全一致 ;亚临界航速条件下舰船兴波波形与水底压力曲线之间的对应关系差别较大 ,而跨临界或超临界航速条件下则有所改善 .

Using developed systems for measuring surface wave and hydrodynamic pressure variation, various surface waves(ship wavemaking, regular wave,irregular wave and wave pattern caused by a moving ship in wave) and pressure fluctuations on sea bottom were measured. The relation between the surface wave and the bottom pressure fluctuation is analysed. The research results show that crest and trough of bottom pressure variation are consistent with those of regular wave, and a good agreement exists between theoretical computations and measurements of pressure fluctuations. It also appears that the frequency of pressure variation induced by irregular wave reductions, its period becomes longer, and crest and trough of bottom pressure variation do not completely agree with those of irregular wave. When a ship sails at subcritical speed, the corresponding relation between ship wavemaking pattern and bottom pressure curve appears much difference, but it slightly improves transcritical or supercritical speed.