With the growing global emphasis on environmental protection and sustainable development, the shipping industry is facing severe pressure to reduce emissions and save energy. As a clean and renewable energy source, wind energy demonstrates significant potential in the field of ship auxiliary propulsion. This paper takes the KVLCC2 ship as the research object and establishes a three-degree-of-freedom mathematical model for ship motion. The thrust and moment generated by a specific type of sail on the hull in a wind field are introduced as additional terms into the model, enabling the simulation of the sail-assisted ship's motion under wind conditions. Simulation studies on the turning and zigzag motions of the sail-assisted ship reveal that the sail has a significant impact on the ship's maneuverability. Under a wind speed of 8 m/s, the sail increases the ship's turning drift distance by 38.4 m (accounting for 12% of the ship's length) while also increasing the ship's speed during the turning process by 28.1%. In zigzag motion, the sail increases the ship's overshoot angle, particularly during upwind turns, where the second overshoot angle increases from 18.4° to 25.7°. Under beam wind conditions (±90°), the sail induces an asymmetric effect on the ship's steering. The auxiliary effect of the sail is more pronounced during downwind steering, whereas upwind steering requires an increase in the rudder angle for compensation.

Pressure-resistant structural materials are the foundation for supporting the descent and ascent of marine equipment. Titanium alloys, with their characteristics of lightweight, high strength, and corrosion resistance, have become the preferred materials for pressure-resistant structures in deep-sea manned equipment and show promising prospects for application. This article briefly describes the development history and research progress of typical deep-sea manned equipment such as submarines, submersibles, deep-sea workstations, and underwater laboratories, as well as their pressure-resistant structural materials. The current state of domestic titanium industry development and the research foundation in the titanium alloy material system for marine engineering, titanium alloy pressure-resistant structure manufacturing technology, and design and testing research is introduced. In combination with the technical characteristics of large deep-sea equipment titanium alloy structures, the article analyzes the key scientific and technological issues and application demands for titanium alloys used in pressure-resistant structures, providing a reference for the future development of titanium alloys for pressure-resistant structures in deep-sea manned equipment.