海洋拖曳系统的船/缆/体耦合模型研究

为进一步提高海洋拖曳系统在不同情况下运动响应的预测精度,将拖曳母船、拖缆和拖曳体三者视为一个相互作用的整体,利用其耦合边界条件,将拖缆顶端和底端的张力及其产生的力矩,分别与船舶操纵性运动方程(MMG模型)和拖体六自由度运动方程相结合,利用拖缆的有限差分方程,建立了船/缆/体三者耦合模型,进而采用数值计算方法,对比分析了该模型与常规算法。结果表明,该模型考虑船/缆/体三者的耦合影响,可更加准确全面地反映拖曳母船的速度、旋回半径、横摇角等操纵性特征以及拖曳体的深度、姿态等信息所受到的影响,从而为准确预报海洋拖曳系统的运动响应提供更为直观、科学的理论依据。

Research on the coupling model of underwater towed system

In order to predict the behaviors of the underwater towed system under different conditions more precisely, the towing ship, towed cable and towed vehicle are treated as a whole. Using the boundary condi-tion of the system, the tension and moment of the towed cable’s upper end and bottom end are used into the MMG model of ship and the six freedoms equation of towed vehicle respectively. Moreover, coupling with the finite difference method of towed cable, the couple model of whole system is established. The numerical method is developed based on this model to predict the behaviors of the underwater towed system. Compared with normal method, the numerical results indicate that the velocity, turning radius, roll angle of towing ship and the depth, attitude of towed body are affected. This model can be used as the basic theory for predicting the behaviors of underwater towed system.