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Original title: 400 kilometers per hour “fix” of development of high-speed train acceleration technology
Beijing Business Daily (Reporter Tao Feng and Wang Chenting) On December 22, the State Information Office held a conference on the white paper on the sustainable development of China’s transportation. According to Yan Hexiang, chief engineer of the National Railway Administration, the National Railway Administration is organizing the “XIV Five-Year Railway Development Plan”, which will promote key technologies for 400 km / h high-speed railways and technical reserves of the levitation system. 600km high speed magnetic. Investigation and development. A reporter for Beijing Business Daily interviewed several railway experts and learned that ten years ago, high-speed trains could already run at speeds of more than 400 kilometers per hour and they all met safety standards.
Liu Xiaoming, Vice Minister of Transport, presented that at the end of 2019, the national railway operating mileage was 139,000 kilometers, of which high-speed rail exceeded 35,000 kilometers, ranking first in the world. It is estimated that by the end of 2020, national rail mileage will reach 146,000 kilometers, including 38,000 kilometers of high-speed rail and 90,000 kilometers of rail in the central and western regions. The double rail rate and the electrification rate reached 60% and 73%, respectively. A high-speed train construction and equipment manufacturing technology system with independent intellectual property rights has been formed.
Fuxing’s Chinese standard EMU achieved commercial operation at a speed of 350 kilometers per hour, and basically a series of product pedigree was formed. For the first time in the world, smart EMUs have achieved automatic driving at a speed of 350 kilometers per hour. The equipment level of high-power railway locomotives, heavy vehicles and communication signals has been considerably improved.
Yan Hexiang said that in accordance with the relevant state labor agreements, the State Railway Administration is organizing the investigation and preparation of the “14th Five-Year Railway Development Plan”. In terms of promoting the development of science and innovation in railway technology, promoting the research and development of key technology of the 400 kilometer per hour high-speed railway, the technology reserve of the 600 kilometer high-speed magnetic levitation system , key innovative technologies, enhance corporate innovation capabilities, and enhance scientific and technological innovation systems and mechanisms.
According to Xie Xiaowen, an expert member of the New Technology Promotion Branch of the China Communications and Transportation Association, China’s high-speed railways are moving at 400 kilometers per hour, which was expected. From the perspective of the development of high-speed rail technology, China does not have a problem with the full set of technology and manufacturing at 400 kilometers per hour, but simply the problem of “letting go”. As early as December 3, 2010, the CRH380A high-speed EMU set a maximum operating speed of 486.1 kilometers per hour on the 220-kilometer pilot section of the Beijing-Shanghai high-speed train between Zaozhuang and Bengbu.
There are three important indicators to measure the safety of the high speed train. International standards stipulate that the derailment coefficient is not more than 0.8, the lateral force of the wheel axle is not more than 48, and the wheel load reduction rate is not more than 0.8. In 2010, the CRH380A high-speed EMU was piloted by the Beijing-Shanghai high-speed railway. Running at a speed of 486.1 kilometers per hour, the three indices are 0.13, 15 and 0.67, which are the 16%, 31% and 84% of the safety limit respectively, and are better than the safety of the high-speed train of 350 kilometers per hour.
Railway transportation engineer Wang Dashui told the Beijing Business Daily that because rail transportation is a huge system project, high-speed trains with a speed of 400 kilometers per hour cannot be operated directly on the railway line. high speed 350 to a speed of 400 hours. “The technology of changing the rules of wheel sets presents safety risks, not only in the process of changing gauge, but also at each moment of train operation. But if the train operates at a speed of 400 kilometers per hour at 350 hours, This will definitely increase the speed of the trains on the entire line, and the efficiency of the operation of the line will also increase simultaneously. This is the potential economic benefit of the 400 km / h high-speed train. Because the System engineering has a rule of 80: the system operates at 80% load, which is the best operating state. “
Is it possible to exceed 400 kilometers per hour? Xie Xiaowen told a Beijing Business Daily reporter: “In 2014, the static test speed of the high-level CIT500 high-speed train developed by China in the inner wheel and rail laboratory reached 605 kilometers per hour. Now, In recent years, China’s high-speed train technology has continued to develop new developments. Technological development will be more mature and stable. “
However, there is a big difference between test speed and running speed. A reporter from the Beijing Business Daily noted that on December 21 last year, at the 2019 International Engineering Technology Development Strategy High-Level Forum held in Jinan, Shandong, Fu Zhihuan, an academic from the Academy of Engineering of China and former Minister of Railways, stated that China is developing a 400-kilometer-level high-speed train system. Research has been carried out on key magnetic levitation technologies and high-speed trains with low-vacuum pipelines, but at the moment high-speed trains with a speed of 500 kilometers per hour cannot be developed.
“Not that it is impossible to test, but it is an application problem, because the energy consumption of high-speed trains is proportional to the square of the speed, and the impact of high-speed trains on environmental noise is proportional. to the sixth speed power. To solve these problems, we still have to work hard, “Fu Zhihuan said at the time.
