China removes the “boom tunnel”, the main brake of the project

China is testing a new generation of magnetic sustaining trains (Maglev) capable of spinning at 600 km/h, and could have found the solution to a major problem: the ” tunnel boom ».

What is the “ tunnel boom » ? – China removes "boom tunnel", main

A pioneer in high rail speed. Nevertheless, China again placed on the Maglev train, after a first line inaugurated in 2004 between Pudong and Shanghai airport. For example, This type of train is not based on wheels like a classic TGV: It floats above the rails thanks to magnetic forces. For example, which removes friction and makes it possible to reach much higher speeds.

Thus, where a TGV caps around 350 km/h, the new Chinese prototype aims at 600 km/h. Moreover, But this speed poses a well -known problem of engineers: the “ tunnel boom ». Consequently, When a train enters a china removes “boom tunnel”, main tunnel, the air is compressed as in a syringe. At the exit. This compression translates into a shock wave that spreads in the air, causing deaf noisevibrations and potentially damage to the surrounding structures.

The phenomenon. already present at 350 km/h, becomes much more marked at 600 km/h: a tunnel of only 2 km can be enough to cause a boom. And this shock turns out to be powerful enough to disrupt residents, scare animals and weaken certain infrastructure.

What solution?

To remedy it, Chinese researchers have developed long acoustic shock absorbers placed at the entrance to the tunnels. These 100 -meter structures. with a porous surface china removes “boom tunnel”, main and supplemented by a special coating inside the tunnel, allow compressed air to escape gradually before the train arrives. Result, The force of the shock wave is reduced to 96 %, a bit like a silencer on a firearm would.

If this technology were to be deployed on a large scale. it would improve the safety of residents and infrastructure, would limit the nuisance for fauna, and offer passengers a more comfortable journey. For the moment. no official calendar has been announced, but the public manufacturer CRRC, at the origin of the project, is already working on its integration into future lines. The most anticipated would connect Beijing to Shanghai in 2:30, against 4:30 am currently.

Note that China is not the only one to bet on the Maglev. Japan also prepares its Shinkansen CHUO. supposed to connect Tokyo to Osaka in just over an hour at a speed of china removes “boom tunnel”, main 505 km/h. To a lesser extent, India and South Korea also look at the issue.

What Allow trains to better compete with the plane thanks to much shorter journeys but above all. much lower CO2 emissions.

• China develops a Maglev train capable of moving to 600 km/h. and thinks it has found the solution to the problem of ” tunnel boom ».
• Innovative acoustic shock absorbers would reduce this phenomenon up to 96 %.
• This advance could make journeys safer, more comfortable and more respectful of the environment.

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