Scientists
at Southwest Jiaotong University in China have reportedly built a
maglev train that could reach 1,800 mph (2,900 km/h). According to The Daily Mail,
a vacuum is used to minimize air resistance. Project lead Dr Deng
Zigang claims it could be used for military or space launch systems.
Maglev trains use electromagnetism to lift the train off a track and to provide propulsion. By removing the need for contact with a surface via wheels, friction is substantially reduced and speed can be increased. They are also smoother to ride than surface-supported alternatives and are less affected by the weather.
Maglev trains use electromagnetism to lift the train off a track and to provide propulsion. By removing the need for contact with a surface via wheels, friction is substantially reduced and speed can be increased. They are also smoother to ride than surface-supported alternatives and are less affected by the weather.
The current fastest passenger-carrying maglev train can travel at up to 268 mph (431 km/h) and once reached 311 mph (501 km/h) in
pre-launch tests. The Shanghai Maglev Train opened in April 2004 and
runs 18.95 miles (30.5 km) from the center of the Pudong district of
Shanghai to Shanghai Pudong International Airport.
At those sort of speeds, air resistance becomes a serious issue. The
Mail article cites a paper by Zigang in which he writes, "If the running
speed exceeds 400 kilometers (250 miles) per hour, more than 83 percent
of traction energy will wastefully dissipate in air resistance."
The idea of running a maglev train in a vacuum, therefore, seems a
logical one. It would increase its potential top speed and improve its
energy efficiency. This principle is the same as the one that the Evacuated Tube Transport is based, which could theoretically transport people between new York and Beijing in 2 hours.
Elon Musk's proposed Hyperloop,
meanwhile, isn't thought to use a vacuum to reduce air resistance, but
will still potentially max out at 760 mph (1,220 km/h). Zigang's concept
would leave even that in its dust.
In developing the train, Zigang first had to create a small,
remote-controlled ring-line version of the system on which the maglev
vehicle could accelerate to 15 mph (25 km/h). That was achieved in
February last year, after which an evacuation tube was added to create
an internal vacuum.
With the vacuum created, the vehicle was reportedly able to accelerate
to a maximum speed of 30 mph (50 km/h). The prototype was, of course,
run without passenger and was limited by the small 6 m (20 ft) radius of
the ring guideway.
"The meaning of the project is that it will be the first one to realize
the prototype of the future evacuation tube transportation," The Daily Mailreports
Zigang as saying. "At this moment, we are conducting evacuation tests
on the new system. We will release our achievements after the successful
running in the near future."
Source: Extraa Education
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