It is safest to return to Hong Kong to take shelter.
Everyone knows that there can be no waves without wind. The generation of waves is mainly due to the effect of wind. The wind blows the sea surface, causing periodic movement of the sea surface, causing the waves to rise and fall. In a windy and rough weather, every day A square meter area is impacted by a force of several tons or even dozens of tons. When encountering violent storms, some ships are easily overturned by strong waves. Therefore, when encountering strong winds and waves, ships must return to the harbor to take shelter.
If the wind and waves are likely to exceed the boat's ability to withstand it, stop the boat and anchor, and wait for the wind and waves to pass before leaving. If you must go, it is naturally safer to go with the wind and waves. Do not place the side of the boat facing the wind and waves, as it may capsize easily.
Basic information
"Safety Assessment of Ship Navigation under Severe Weather Conditions" analyzes the research theory of ship safety navigation, summarizes the ship safety assessment method, and elaborates on the safety of ship sailing The necessity of safety assessment; a comprehensive analysis of the current status of general accidents around the world, and the use of gray system theory to conduct correlation analysis on the causes of general accidents under severe weather conditions.
A statistical analysis was conducted on ship inspection defects and reasons for detention, and the seaworthiness of ships under severe weather conditions was discussed based on the "Technical Requirements for Safe Sailing of Sea-going Ships" and some related specifications, from the perspective of people, ships and The impact of various factors on ship sailing safety was analyzed from an environmental perspective, and a scientific and systematic evaluation index system for ship sailing safety under severe weather conditions was established.
Fuzzy comprehensive evaluation method, probability influence diagram method and BP neural network method are respectively used to evaluate the safety of ship sailing under severe weather conditions. Finally, rough set theory was used to conduct data mining on the evaluation results of the three methods, and the final conclusion was drawn through the analysis and verification of the data mining results. The results show that the fuzzy comprehensive evaluation method and the probability influence diagram method are more suitable for the safety assessment of ship sailing under severe weather conditions.
The main driving force for a sailboat to travel against the wind is suction.
According to the principle of aerodynamics, as the fluid speed increases, the pressure will decrease. To get around the outward-curving surface of the sail, the air must speed up, so the pressure decreases, creating a suction force that pulls the sail to one side. The suction force produced by the reduced pressure on the leeward side of the sail is quite large, and can be twice as powerful as the force pushing the sail on the windward side.
The suction and thrust generated by the wind on both sides of the sail cause the ship to move sideways; but the center plate prevents the ship from moving sideways. Therefore, the wind force is decomposed into two components, and one component pushes the sailboat to the side. When traveling forward, another force causes the boat to tilt to the leeward side, and the helmsman has to lean out on the other side of the boat to maintain balance.
Sailboats cannot sail completely head-on into the wind. A 12-meter-long sailboat can sail upwind at an angle of 12-15 degrees to the wind direction. If you want to go head-on into the wind, you must sail in a zigzag route. When traveling against the wind, the smaller the angle between the boat and the wind direction, the slower the speed. If the helmsman sails in a zigzag route with a larger angle, the ship will speed up, but the voyage will be longer.