The main function of ship anchor chain is to fix and stabilize the ship. From the following aspects.
1. In order for the chain to work, the most basic condition is to hook the East and the West on the seabed. If the chain is not long enough, the anchor will not work. If the seabed is flat, or there is no hook to hold the anchor, or the hook is not very strong, then if the wave is calm and the wave is still OK, the anchor will not be able to hook and the anchor will lose its function once the wave is too large. This is called "anchor walking.". It is very dangerous for the ship to move the anchor during anchoring because the main engine usually stops when the ship is anchored. If the ship sets sail immediately, it will take time and is very dangerous for ships without power. dangerous. That's why the concept of anchoring came into being. Anchoring means that the seafloor is relatively rough. In addition, it is necessary to avoid the wind.
2. The weight of the anchor chain is negligible for the ship, and the friction is very small, which will not have a great impact. Generally speaking, the anchor chain is straight and the friction force can be ignored. If you are by the sea, you will find many small fishing boats whose anchor chains are thick ropes.
3. From the top of the ship, the chain is straight, but there is a part of the water near the seabed (actually, it is close to the seabed). The anchor provides the holding force, which is then transferred to the ship through the anchor chain to resist the influence of external loads of current and wind waves on positioning. The reason why there is a section near the seabed is to consider the effect of forces. Think about it. An anchor. The chain is straight and easy to move. And the area close to the seabed can provide a certain range of margin.
