有限水深双船航行水底压力计算与实验研究

Calculation and experiment of bottom pressure variation induced by two ships in finite depth

应用势流理论中的格林函数计算了双船航行时水底压力变化,利用面元法在船体表面上分布有限水深Kelvin移动兴波源,通过求解满足双船物面条件的线性方程组,得出不同航速与位置的源强大小,探讨了航速与相对位置对源强计算结果的影响.进一步计算了双船航行时水底的压力变化,同时研制了双船水底压力测量系统,计算与实验结果曲线特性一致,发现水深弗劳德数与双船相对位置是影响双船水底压力曲线畸变的主要因素,为以多船编队航行改变水底压力分布提供理论依据.

Applying Green function method of potential flow theory,the bottom pressure variation induced by two ships was calculated.The Kelvin wave source of steady motion in finite depth was distributed on the surface of ship by panel method,the source at different speed and displacement was calculated by solving the linear equations,which satisfy the two ships body boundary condition.The influence of source by speed and location was discussed.The bottom pressure variation with two ships was solved further.At the same time,an experiment measurement system for two ships bottom pressure was developed.A good agreement between calculation and experiment results was found.It was concluded that the main factor of bottom pressure curve deformation is water depth Froude numbers and two ships distance.It can provide the theory base of changing bottom pressure distribution by multi-ships fleet sailing.