1 The application of anchor when the wind is blowing and the ship is docked
When the wind is blowing and the ship is docked, it is more difficult to maneuver the ship. When the wind blows above level 5, it will be even more difficult for an empty ship to maneuver at the dock. Without the assistance of a tugboat, it is very dangerous not to drop anchor for assistance, and it is difficult to ensure the safe berthing of the ship. How to use anchors reasonably, factors to consider mainly include the timing of anchoring, the length of the anchor chain, the force on the anchor chain, external weather conditions, etc. These are the keys to ensuring the safe berthing of the ship. This kind of berthing can be divided into the following situations:
1.1 The wind blows from the direction of the bow (commonly known as the forward eight-figure blowing wind). According to the direction of the bow, the direction of the wind and the direction of the anchor chain, we first analyze the stress on the ship. When anchored, the ship is affected by the anchor's pulling force T and the wind force F. According to the decomposition of the force, T is decomposed into T1 and T2, and F is decomposed into F1 and F2. It is not difficult to see that T1 and F1 have opposite directions, and the resultant force on the ship is: (T1-F1); T2 and F2 have the same direction, and the resultant force on the ship is (T2+F2). Looking at the direction of the resultant force (Tl-F1), the direction is perpendicular to the dock. The changes in T1 and F1 will determine the speed of the ship's bow getting closer. Changes in T2 and F2 will determine how fast the ship moves forward and backward. After recognizing the functions and directions of these forces, we further analyze their changes. (T1-F1) is the force perpendicular to the dock. When (T1>F1), the bow is pulled by the anchor and moves toward the outer block of the dock. When (T1 1.2 The wind blows from the stern direction of the ship (commonly known as the back-eight blowing wind) The force on the ship is the pulling force T of the anchor and the wind force F. We decompose T into T1 and T2 , decompose F into F1 and F2, where T1 and F1 have opposite directions, and their directions are perpendicular to the dock. The resultant force on the ship is (T1-F1). When (T1>F1), the bow moves toward the outer block of the dock; when (T1