In view of the continuous technological innovation in marine engineering and the growing demand for enhanced adaptability to complex sea conditions, the binocular vision-based KCF (Kernelized Correlation Filters) algorithm is used as the target detection method based on the wave compensation device detection system. Based on the binocular vision, this method detects the load motion, capture the image feature points, calculates the position of the load in the inertial reference frame through coordinate system transformation, and monitors the spatial position and attitude of the replenished object in real time. The relative movement between the load and the replenishment ship can be eliminated by controlling the six-degree-of-freedom motion of the load, thereby achieving wave compensation. Program is developed under the Ubuntu system based on the robot operating system (ROS). Comparison and simulation are then conducted with a wave compensation prototype to validate the feasibility of the proposed detection and tracking method. The results indicate that this method is suitable for wave compensation systems.

The experiments of crack propagation at the corner of the porthole structure are reproduced to study the impact of the cracks on the porthole structure of cruise ships by using the finite element software, which verified the feasibility of the current research method. Two types of porthole structure models are then established to discuss the crack propagation characteristics at the corner of the porthole structure under different factors by using the crack propagation software. The ultimate compressive strength of the porthole structure with cracks is also calculated. Finally, the ultimate state function of the porthole structure is proposed based on the improved Paris formula from the viewpoint of fracture mechanics. The failure probability and reliability index of the structure under different conditions are calculated by the Monte Carlo method. The results can provide references for the design of luxury cruise ships.

Three ways of application of shipborne automatic identification system (AIS) in ship navigation are systematically sorted out aiming at the safety hazard imposed due to the problem of the shipborne AIS only receiving messages but not sending out messages when it is in use. The timing of the information broadcast is given for the shipborne AIS in the severe weather conditions, narrow waterway and heavy traffic sea areas combined with the usage requirements. The reasonable and timely broadcasting of the AIS information of military ships can provide the effective means of the safety guarantee in the complex and changeable navigation environment.