自由表面上球形浮体的拖曳运动仿真与试验

浮体在自由表面上的拖曳是一种常见的拖曳形式,由于自由表面上物体的运动情况相当复杂,目前对这种拖曳系统的设计和分析一般采用试验的方法。通过理论分析,对球形浮体在自由表面上的匀速直线拖曳运动建立了数学模型,其中对缆绳的分析采用Ablow-Schechter提出的有限差分模型,对球形浮体的分析采用水动力系数法,整个耦合系统用有限差分方法求解。之后,在拖曳水池进行了试验,试验结果表明,这种方法在拖曳速度比较低的情况下能够模拟真实情况,可以用来指导拖曳系统设计。

It is a common style in towed systems that towed body exists on the free surface.Because of effect of free surface,it is difficult to predict the motion of the towed body,and engineers usually use experimental method in design.This paper studied a spherical body towed on the free surface at a constant speed,numerically simulated the towed system,using Ablow-Schechter's method for the towed cable and drag coefficient method for the spherical body.The experiment in a towing tank shows that this model can simulate the true environment at low speed and give instructions to towed system design.