救生筏与救助艇在波浪中的拖曳动力学分析

Towing dynamics analysis of the liferaft and the rescue boat in waves

为了对救生筏和救助艇在波浪中的拖曳动力学进行分析,本文利用Morison方程计算波浪对艇和筏的作用力,采用集中质量法对拖缆建立动力学模型,根据阻力系数计算流体阻力,采用Kane方法对救生筏、救助艇以及绳索建立多体动力学方程,利用四阶Runge-Kutta对方程进行数值求解。将本文的数值结果与模型实验结果进行比较,结果表明,拖缆张力载荷较为吻合。根据本文模型对不同长度拖缆张力载荷进行分析,当拖缆长度与波长相差约在15%以内,拖缆张力的峰值得到显著降低。

In order to analyze the towing dynamics of the liferaft and rescue boat in waves,the wave forces acting on the raft and boat were calculated by the Morison equation,the dynamics model of the towline was established by lumped mass,the fluid drag was calculated according to the drag coefficient,the multi-body dynamic equations for the raft,rescue boat,and rope were established by the Kane’s method,and solved by the fourth-order Runge-Kutta.The numerical results in this paper were compared with those of model experiment,and the tension loads of the towing lines were consistent.According to this model,the tension loads of different length towing lines were analyzed.When the difference between the towing line and the wavelength is less than 15%,the peak tension is significantly reduced.