甲板上浪船舶随机横摇响应的数值模拟

Numerical Simulation of Random Rolling Response of Ship with Water on Deck

数值模拟随机横浪中甲板上浪船舶的横摇响应.考虑随机横浪激励和甲板上浪引起的横倾力矩,建立船舶随机横摇运动方程.基于伯努利方程,推导船舶甲板上浪水质量的计算公式.以一条拖网渔船为例,计算不同波高作用下船舶的横摇响应,分析甲板上浪对船舶倾覆的影响.研究表明:考虑加工甲板上浪后,船舶有2个横摇中心,在响应过程中发生由一个横摇中心到另一个横摇中心的随机跳跃;单独考虑捕鱼甲板上浪或加工甲板上浪时,船舶可以承受大的波浪载荷而不发生倾覆;同时考虑捕鱼甲板上浪和加工甲板上浪时,横摇过程中捕鱼甲板上浪水量突然增大,导致船舶倾覆.

The rolling response of ship with water on deck in random beam wave was numerically simulated.The random rolling equation of ship was established considering random beam wave excitation and heeling moment caused by the trapped water on deck.The formula for calculating quality of water on deck was derived based on Bernoulli equation.Taking a trawl ship as an examplet,he rolling responses of ship in different wave heights were calculated and the effect of trapped water on deck to ship capsizing was investigated.It is found thatt,he rolling process of ship has two roll centers when considering the water accumulated on the factory deck,and the random jumping from one roll center to another occurs.When the water on the trawl deck and the water on the factory deck are considered sepa-ratelyt,he ship rolls without capsizing even under high wave excitation.When the water on the trawl deck and the water on the factory deck are considered simultaneouslyt,he water accumulated on the trawl deck increases suddenly in the process of rolling and ship capsizes accordingly.