Ship Dynamic Collision Avoidance Mechanism Based on Course Control System
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摘要: 为探索航速矢量变化与船舶避碰之间的动态变化规律（避碰机理），研究了结合船舶领域和速度障碍等方法的静态避碰机理，确定了不考虑船舶改向运动过程与周围环境变化前提下，本船可避让所有物标的航速矢量区间；建立了基于模糊自适应比例积分微分（PID）控制和船舶运动方程的航向控制系统，再现船舶改向过程中的航速矢量非线性变化；基于静态避碰机理和航向控制系统研究了船舶动态避碰机理，求解了符合船舶操纵运动过程的动态避碰改向区间. 研究结果表明，在开阔水域随机设置的多物标环境中，可得到符合航速矢量非线性变化的动态避碰改向区间集合 [−90°，−72°]、[31°，47°]、[62°，79°]，受动态船舶主要影响形成改向范围为（−72°，31°）、（79°，90°] 的碰撞航向区间，符合船舶操纵运动对改向避碰的影响规律，可为实现船舶避碰辅助决策、自动避碰和动态避碰路径规划提供基础理论和方法.
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关键词:
- 避碰机理 /
- 速度障碍 /
- 船舶领域 /
- 模糊自适应比例积分微分（PID）控制 /
- MMG（分离型船舶操纵运动模型）
Abstract: To explore the relationship between the variation of ship speed vector and the effect of collision avoidance, the static collision avoidance mechanism with the combination of ship domain and velocity obstacle methods was analyzed. Ship speed vector range for the avoidance of all objects without considering the motion process of ship course altering and the external environment was then determined. A course control system based on fuzzy adaptive proportional integral differential (PID) and ship motion equations was developed to reconstruct the nonlinear variation of ship speed vector during course altering process. The dynamic collision avoidance mechanism was then established based on the static collision avoidance mechanism and the course control system. The dynamic course altering range that satisfies the non-linear variation of ship speed was then obtained. The results indicate that in open waters where multiple objects are randomly located, the course altering ranges that satisfy the non-linear speed variation are [−90°, −72°], [31°, 47°], [62°, 79°], under the influence of ship dynamics, the course altering ranges that could cause collision are (−72°, 31°), (79°, 90°]. The obtained results are consistent with the influence of ship motion characteristics on collision avoidance with course altering and can provide a theoretical reference for the development of decision-support for ship collision avoidance, automatic collision avoidance and dynamic ship route planning. -
图 3 不考虑转向过程的速度障碍区
Figure 3. Velocity obstacle area without consideration of the steering process
图 6 船舶领域速度障碍真运动示意
Figure 6. Sketch map of true motion based on ship domain and speed obstacle
表 1 船舶资料
Table 1. Ship information
对象 数值 对象 数值 排水量/t 90 000 螺旋桨转速/（r•min−1） 90 船长/m 225 舵面积/ m2 56.88 船宽/m 32.5 螺旋桨进距/m 4.738 吃水/m 14.5 水密度/（kg•m−3） 1 000 
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表 2 物标初始状态
Table 2. Initial state of objects
物标 坐标 航向/(°) 航速/kn 他船 1 （3，9） 200 10 他船 2 （5，8） 170 12 他船 3 （−4，1） 60 13 他船 4 （−3，7） 120 11 静态物标 1 （−4，4） 静态物标 2 （4，2）
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