What is the function of a ship's anchor?
Release time:
2020-03-24
The primary function of a ship’s anchor is to secure and stabilize the vessel. This can be explained from the following aspects: 1. For an anchor to work effectively, the most fundamental requirement is that it must hook onto something on the seabed. If the anchor chain isn’t long enough, the anchor won’t be able to do its job. If the seabed is flat, or if the object the anchor is hooked onto isn’t firmly fixed, or if the hook isn’t secure enough, then while the sea may be calm, once the waves become too high and the anchor can no longer hold onto anything, the anchor will lose its effectiveness. This phenomenon is called “anchor dragging.” During anchoring, if the ship experiences anchor dragging, it becomes extremely dangerous.
The primary function of a ship’s anchor is to secure and stabilize the vessel. This can be explained from the following aspects:
1. For an anchor to work effectively, the most basic requirement is that it must hook onto something on the seabed.
If the anchor chain isn't long enough, the anchor won't hold. If the seabed is flat, or if whatever the anchor is hooked onto isn't firmly fixed, or if the hook isn't secure enough, it might be fine in calm weather—but once the waves become too high and the anchor can no longer grip the bottom, it will lose its effectiveness. This phenomenon is called "anchor dragging." During anchoring, anchor dragging is extremely dangerous.
2. The weight of the anchor chain is negligible for the ship—it won’t make much of a difference.
Generally speaking, when a ship is at anchor, its anchor chain is usually straight. Do you think there would be any friction acting on the anchor chain at this point? If you’re by the seaside, you’ll notice that many small fishing boats have thick ropes for their anchor chains.
3. From above the ship, the anchor chain appears straight; however, beneath the water, a section of it runs nearly parallel to the seabed. In reality, this section of the anchor, which is in close contact with the seafloor, provides the gripping force that is transmitted via the anchor chain to the vessel, thereby helping the ship resist the external loads imposed by ocean currents and waves and maintain its position. The reason for having a section that lies close to the seabed is to account for the effects of stress: by keeping a portion of the chain in contact with the seafloor, we create a margin of safety that remains effective within certain limits.
Although the weight of an anchor isn't significant, there are specific regulations governing which size of anchor should be used for ships of different sizes. This is due to factors such as the gripping power that an anchor can generate and its own inertial force. The frictional force exerted by the anchor chain also plays a role.
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