Talk about the black box

In the past two days, information about the search and rescue of China Eastern Airlines plane crash has been constantly revealed in Weibo.

Among them, there are even different opinions about the black box.

Black boxes on modern airplanes are actually orange-red. If I hadn't just learned Du Niang, I really thought it was black. Colour it bright to make it easier to search. Because it represents an unknown omen, it is commonly known as the black box.

Black box, the scientific name is flight recorder. There are cockpit recorders and flight data recorders. The former can record the pilot's conversation from takeoff to landing, while the latter records all kinds of data during the flight. From the picture, the flight recorder looks like a streamlined micro-container, which is an electrical equipment with high temperature resistance, high pressure resistance, waterproof and corrosion resistance. It was invented by Australian engineer David Warren in 1958, and has undergone three generations of changes.

After the plane crash, finding the black box can restore the detailed information before the accident and reproduce the process of the accident, which plays an important role in the investigation, characterization and aftermath of the accident.

But as we all know, due to the unpredictability of accidents, it is very difficult to search for black boxes, and many black boxes of aviation accidents are not easy to find.

Some netizens asked why the black box doesn't need GPS positioning, so it can be found quickly. The expert's explanation is that the black box itself has a positioning system and GPS is not suitable. One is because GPS can't send signals like a mobile phone, and the black box doesn't have this function, it only receives. Another reason is that GPS power consumption is high, and the black box itself is difficult to find, so we can only choose the scheme with the lowest power consumption, that is, sending positioning through radio signals.

However, the biggest disadvantage of receiving this kind of signal is that it is greatly influenced by the environment and the distance. If there is moisture nearby, the signal is worse. What should fall into the sea is also sent by electrical signals. When it works underwater, it can send out ultrasonic signals, find them through special sonar detectors, and then locate them.

Some netizens questioned that since it is so difficult to receive signals, why not use a cloud server? Can the driving data of Trass cars be retrieved by manufacturers through cloud storage? Meanwhile, with the development of modern science and technology, spaceships and space stations can keep in touch with the ground at any time. Why can't we realize real-time data transmission in the cloud and synchronize all the data of the aircraft black box to the cloud server in real time?

If you don't know the professional skills, you should learn them yourself.

I hope to find the black box as soon as possible, find out the cause of the accident as soon as possible, and actively respond to social concerns. At the same time, key industries such as civil aviation should carry out safety hazard investigation, learn lessons and ensure aviation operation and people's life safety.