The test speed of the hottest Chinese version of s

2022-08-07
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The test speed of the Chinese version of "super high speed rail" is expected to reach 1500 km/h

"the Chinese version of super high speed rail will adopt the technology of 'high temperature superconducting magnetic levitation + vacuum tube'. At present, the feasibility of 1500 km/h has been discussed." On June 19, at the "high speed railway technology development forum" of the 2018 World Transportation Conference, zhangweihua, chief professor of southwestjiaotonguniversity, told Science and technology

Zhang Weihua introduced at the forum that day that the "dynamic simulation test platform for multi state coupled rail transit" undertaken by southwestjiaotonguniversity is to carry out the operation test of proportional model vehicles with different maglev modes in a 1500 meter vacuum pipe that can simulate different low-pressure environments. Including the high-temperature superconducting maglev mode, the test speed exceeds the sound speed, which is expected to reach 1500 kilometers per hour in theory

by the end of 2017, the operating mileage of China's high-speed railway had reached 25000 km, about 2/3 of the total operating mileage of the world's high-speed railway. The design speed was as high as 350 km/h-380 km/h, and 5200 trains had been put into operation. China has become a real high-speed Railway country

according to information from CRRC, China Railway Construction Corporation, etc., China's high-speed rail is currently conducting technical research at a speed of 400 kilometers per hour. In november2016, the national key research and development plan "advanced rail transit" key special project "key technology of high-speed passenger transport equipment with a speed of 400 kilometers per hour and above" was officially launched; In 2014, China Railway Construction Electrification Bureau also developed "high-speed ultra-fine grained copper magnesium alloy wire rod" with a speed of 400 km/h, which is expected to produce advanced light composite materials and above. It is a new high standard in the world, and has been successfully exported and applied to the high-speed railway line in Western Korea

"restricted by adhesion, bow and noise, the critical speed line of wheel rail transit technology is 600 km per hour." Zhangweihua believes that in the next step, high-speed maglev rail transit will become the main direction of rail transit technology development in the future

with the rapid development of maglev technology in Japan, the United States and other developed countries, speed is becoming the focus of high-speed rail technology competition. In 2013, American technology maniac musk first proposed the idea of "super high speed rail". According to his idea, vacuum pipes can be used to build "super high speed rail", and the theoretical speed can reach 1207 km/h

Zhang Weihua revealed that the world's fast-paced vacuum high-temperature superconducting maglev proportional model vehicle test line is being built in Chengdu and is expected to be completed and put into test before the end of this year

according to the data, the special pipe with a diameter of 4.2 meters and a length of 140 meters of this new test line will be tested in a low-pressure environment. The bottom of the test car is covered with special high-temperature superconducting materials, which rely on the low temperature formed by liquid nitrogen to achieve the superconducting and magnetic levitation effects. The suspension height of 10 mm and the bearing capacity of 200 kilometers are the focus of discussion. Compared with the tensile test, the test speed can reach 400 km/h. Previously, the speed of the same type of "super high-speed rail" test conducted by us hyperloop one company was only 387 kilometers per hour

Zhang Weihua told that the laboratory had previously verified that the low resistance operating environment created by "magnetic levitation + vacuum" could effectively improve the speed of high-speed rail in the future

the so-called high temperature superconductivity refers to the zero resistance effect of superconductors made of special materials in the liquid nitrogen environment at minus 196 ℃. Compared with low-temperature superconducting magnetic levitation, high-temperature superconducting magnetic levitation has self stability. In other words, after the high-temperature superconductor is placed on the permanent magnet track, the train can have stable guiding force and levitation force at low speed or even static state

the combination of mature vacuum technology and formed high-temperature superconducting magnetic levitation technology is the future "super high speed rail". The "multi state coupling rail transit dynamic simulation test platform" will increase the basic research of the combination of the two

"the 'dynamic simulation test platform for multi state coupled rail transit' may have been approved by the state in September this year. It will take about 31 months from the start of the project to its completion." Zhang Weihua disclosed

according to this process, China will reach the test speed of 1500 km/h in April 2021, which is the characteristic of pest carriers

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