Comrades, who knows how to degauss an aircraft carrier?

The earth is a big magnetic field, and the compass can drive the target because of the influence of the geomagnetic field. The ship is mainly made of steel and other metal materials, and it is a kind of strong magnetic material. If you stay in water for a long time, it will be very magnetic. Due to the influence of geomagnetic field, the beating of water waves and the operation of external machines, a solid magnetic field will be formed.

According to this feature of warships, the Germans made it clear that magnetic mines will move magnetic needles to detonate mines after being affected by the magnetic field of warships, instead of being triggered by warships like traditional mines. During World War II, the Germans used magnetic mines to blow up more than 1000 allied ships. With the improvement of modern science and technology, there are many kinds of magnetic underwater weapons and magnetic anti-submarine equipment, all of which are conceived according to this natural characteristic of ships. Therefore, in order to achieve "magnetic stealth", it is necessary for naval vessels to undergo current degaussing when they retire.

The traditional degaussing operation has to go through the steps of magnetic measurement, winding, degaussing and measurement. The so-called magnetic measurement is to measure the magnetic field of the ship and confirm the size of the magnetic field; Cable winding is to wrap the ship with a cable to form a coil, and the consequence is that we see the warship in the above picture "tied by flowers"; Degaussing is the degaussing operation when the cable is wound around the current power supply, and the solid magnetic field of the ship is changed by the magnetic field generated by the coil; The final measurement is to ensure that the magnetic neutrality of the hull is neutral and no longer magnetic.

The principle of ship degaussing is to use windings or coils to introduce direct current, so that the windings produce a magnetic field commensurate with the size of the ship's magnetic field and opposite to the target, thus canceling the ship's magnetic field. Degaussing is to counteract and eliminate the magnetic field. The principle of comprehensive degaussing is to use demagnetization principle and hysteresis-free magnetization principle to change the magnetic field into an electric field by alternately attenuating current in the task coil, thus completing the purpose of eliminating the existing magnetic field.

Whether it is a firm degaussing station or a degaussing ship, the ship is regarded as an iron core, and degaussing operation is carried out through a "bound" electrified coil wound on the outside of the ship. This method is time-consuming, and requires a high degree of gardening-it must be carried out in windless anchorage and flat tide. When the sea conditions change frequently, the degaussing obligation of ships often lasts for ten days and a half months.

All warships need degaussing before carrying out their tasks.

1, degaussing operation is to remove the residual magnetic field on the metal shell of the ship to avoid being monitored by other submarines and surface ships during operation.

2. Degaussing can also protect Rong Xing from the invasion of magnetic fuze mines. This mine will be detonated by a magnetic signal carried on the metal shell of the warship.

3. Degaussing can also improve the running speed of Rongxing. Generally speaking, both submarines and surface ships need current degaussing.

4. After degaussing, the submarine can effectively avoid the magnetic detection of anti-submarine aircraft, increase concealment and dive to the bottom of the sea like a sea wolf.

The new vehicle-mounted degaussing station technology can start degaussing operation at any time without ports. The bow and stern of the frigate moored at sea can identify the welded cable joints, and then the degaussing cables are connected to the bow and stern in turn, and the other end is connected to the degaussing power supply vehicle, so that the active magnetic survey can be started and the vehicle-mounted degaussing equipment installed in a standard container can be carried to the sea by a landing ship for degaussing. As early as 20 13, the new domestic vehicle-mounted degaussing station has been equipped with a naval team, which can be regarded as making up for this deficiency.

Degaussing is the most powerful for warships such as minesweepers.

Some improved products are even more arrogant slogans of "no magnetism". For example, the three new minesweepers of the Finnish navy are only degaussing diesel engines specially customized by MTU company, so each component needs to be degaussed independently. At present, everything is dismantled-from the crankshaft to each bolt, as many as 16000 parts, which is extremely expensive.

Other main battle ships, including aircraft carriers, can't master magnetism according to the specifications of this nonmagnetic minesweeper-it can't afford the price, and there will be a few important functions related to the vitality of the ship that can't meet the standard. In particular, their hull steel is actually relatively strong hard magnetic and semi-hard magnetic data. Simple magnetization, magnetization is not simply demagnetized at present, but temporarily retains magnetism.