“In a paper on the subject, Dr Zigang says: If the running speed exceeds 400 kilometres (250 miles) per hour, more than 83 per ceny of traction energy will wastefully dissipate in air resistance. And, he adds, Aerodynamic noise will break through 90 decibels (the environmental standard is 75 decibels). The only way to break this barrier is to reduce the air pressure in the running environment, which he has done in his tube by lowering it to 10 times less than normal atmospheric pressure at sea level. Some systems (notably the Swiss metro system) have proposed the use of vacuum trains - Maglev train technology used in evacuated (airless) tubes, he continues, which removes air drag and pushes the speed higher and higher. ETT (Evacuated Tube Transport) systems might allow HTS Maglev trains to attain speeds in a new order of magnitude, such as super-high 3,000 kilometres (1,800 miles) per hour, which could be applied to some military or space launch systems.”
Posted on: Fri, 30 May 2014 07:45:13 +0000
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