规则波中无人艇回收的水动力性能分析

Hydrodynamic analysis of the recovery of USV in regular waves

[目的]小艇回收过程是典型的多体相互干扰的动力学问题,纵向滑道回收是常用的回收方式,小艇在大船尾流中快速运动冲向艉部捕捉装置时,受到大船的尾流影响,可能会出现倾覆的危险。[方法]采用粘性流数值波浪水池、重叠网格和六自由度运动等技术,以DTMB 5415为母船,模拟Fridsma型无人滑行艇(以下简称无人艇)快速接近母船过程中的干扰运动。计算分析无人艇在波浪中的运动特性,在此基础上开展波浪中小艇在大船尾流中的运动仿真。[结果]计算结果与试验结果的比较表明计算方法可靠。仿真计算结果表明小艇受大船尾流的影响较为明显。[结论]当小艇运动方向不在大船尾流正中心时,小艇的纵倾和横摇会受到显著影响,最终导致倾覆现象的发生。

[Objectives]The recovery of the dinghy is a typical dynamic problem of multi-body interac⁃tion,and the stern-slipway launch and retrieval system is widely used in that process.When the dinghy moves rapidly towards the capture devices which are located in the aft of the mother ship,it may be affect⁃ed by the wake of mother ship which may cause overturn.[Methods]Numerical wave tank,overlapping grid technique and 6-DOF are mainly used and the interference motion of Fridsma planing in approaching the mother ship is simulated.The motion characteristics of planing vessel in waves are calculated and ana⁃lyzed while the grid independence is verified.Then the simulation of small craft's motion in regular waves in the wake of mother ship is carried out.[Results]Comparison of computational and experimental results indicates that the calculation method is reliable.And the simulation results show that the influence from the mother ship is obvious.[Conclusions]When the direction of motion of planing deviated from the cen⁃ter line of the wake of mother ship,the pitch and roll angle of it will be significantly affected,eventually leading to the occurrence of capsizing.