基于速度特征的内河LNG船舶三维动态安全区建模方法

A Modeling Method of Three-Dimensional Dynamic Safety Zone for Inland LNG Ships Based on Speed Characteristics

为提高LNG船舶安全区设置的科学性,保障内河水域LNG船舶的通航安全,提出了一种基于速度特征的内河LNG船舶三维动态安全区建模方法。基于LNG船舶航行方向和速度变化的特点,将传统速度的线性分布模型改进为随机分布模型;利用区域分解法,将复杂的三维几何区域分解成若干个子区域,建立相应的边界方程;基于船舶间极限通过设定约束条件,根据其几何形状,运用停船视距理论、船舶漂移计算方法和富余水深计算方法对安全区内部结构不同方位的安全距离进行数值求解。针对某内河LNG船舶,通过设置不同速度条件进行仿真验证。研究结果表明:该模型能较真实反映船舶安全区在速度影响下的差异变化,为内河LNG船舶航路规划起到参考作用。

In order to improve the scientificity of LNG ship safety zone setting and ensure the navigation safety of LNG ships in inland waterway,a three-dimensional dynamic safety zone modeling method for inland LNG ships based on speed characteristics was proposed.Based on the characteristics of LNG ship navigation direction and speed changes,the traditional linear distribution model of speed was improved to be a random distribution model.Then,by using the domain decomposition method,the complex three-dimensional geometric region was decomposed into several sub-regions to establish the corresponding boundary equations.Based on the limit between ships,constraint conditions were set,and according to their geometric shape,the safety distance of the internal structure of the safety zone in different directions was numerically solved by using the stopping sight distance theory,the ship drift calculation method and the surplus water depth calculation method.For a certain inland LNG ship,the simulation verification was carried out by setting different speed conditions.The research results show that the proposed model can correctly reflect the difference change of ship safety zone under the influence of speed and play a reference role for inland LNG ship route planning.