Magnetic
levitation, maglev, or magnetic suspension is a method by which an object is
suspended with no support other than magnetic fields. Magnetic force is used to
counteract the effects of the gravitational and any other accelerations. Maglev is short for magnetic levitation, which means that
these trains will float over a guideway using the basic principles of magnets
to replace the old steel wheel and track trains. The two primary issues involved in
magnetic levitation are lifting force: providing an upward force sufficient to
counteract gravity, and stability: ensuring that the system does not spontaneously
slide or flip into a configuration where the lift is neutralized.
The Shanghai Maglev
Train, also known as the Transrapid, is the fastest commercial train currently
in operation and has a top speed of 430km/h. The line was designed to connect
Shanghai Pudong International Airport and the outskirts of central Pudong,
Shanghai. It covers a distance of 30.5 kilometres in 8 minutes. Maglev trains move more smoothly and more
quietly than wheeled mass transit systems. They are relatively unaffected by
weather. Compared to conventional
trains, differences in construction affect the economics of maglev trains. Maglev systems have been much more expensive
to construct, offsetting lower maintenance costs.
During a
non-commercial test run on 12 November 2003, a maglev train achieved a Chinese
record speed of 501 km/h (311 mph)..... now that
record stands broken by a Japanese
magnetic levitation train hitting 603km/h (374mph) in a test run near Mount
Fuji. The train beat the 590km/h speed it had set last week in another test.
Central Japan
Railway (JR Central), which owns the trains, wants to introduce the service
between Tokyo and the central city of Nagoya by 2027. The 280km journey would
take only about 40 minutes, less than half the current time. However, passengers
will not get to experience the maglev's record-breaking speeds because the
company said its trains will operate at a maximum of 505km/h.
The government is
also hoping to sell the maglev train technology overseas. Japanese Prime
Minister Shinzo Abe is visiting the US where he is expected to pitch for a role
in building a new high-speed rail line between New York and Washington.
What
a speed and what sort of travel it would be !!!
The Meissner effect
is the expulsion of a magnetic field from a superconductor during its
transition to the superconducting state. The German physicists Walther Meissner
and Robert Ochsenfeld discovered this phenomenon in 1933 by measuring the
magnetic field distribution outside superconducting tin and lead samples.
With regards – S.
Sampathkumar
21st Apr 2015.
