Reporter visits CR450 Critical Systems Laboratory
High-speed rail is a successful example of China's independent innovation and an important embodiment of new quality productivity. Since entering the "14th Five-Year Plan", China's high-speed rail has been leading the world at the same time, constantly developing new technologies and developing new products. The CR450 scientific and technological innovation project led by China Railway Group is currently being fully promoted, which is a key measure to aim at the future development of high-speed rail and strive to achieve higher speed commercial operation of high-speed rail.
CR450 science and technology innovation project mainly includes CR450 EMU and 400 km/h high-speed rail lines, Bridges, tunnels and other infrastructure technology innovation. At present, the CR450 EMU sample is stepping up development, sample when the production line? What new technologies are needed to increase train speed? How to drive the development of related industries in the future? Together into the CR450 EMU sample car development line ↓↓↓
Reporter visits CR450
Critical systems laboratory
Into the CR450 EMU key system laboratory, Zhao Hongwei, chief researcher of the China Academy of Railway Sciences, first took reporters to see the digital model of the braking system. In her view, from 350 kilometers per hour to 400 kilometers per hour, the most critical technology is not whether it can run, but whether it can stop, stop steadily, and stop accurately.
Zhao Hongwei, chief researcher of China Academy of Railway Sciences: The most important thing is the braking system, which must be able to stop. Our technical specifications at the top level require that the braking distance should be consistent with the braking distance of the CR400 at 350 kilometers per hour, which is also 6500 meters, and the braking capacity of the entire train must be improved.
The reporter then simulated the brakes, and the large screen showed obvious changes in the brake cylinder data module, which was obtained from hundreds of real test records.
The red-hot disc in the lens is the brake disc being tested. It gradually changes from black to red and then from red to black under simulated extreme conditions, and the temperature difference can exceed 700 ° C. The data accumulated in the process of change will be stored in the "smart brain", build a digital model, and carry out precise calculations for each link.
Zhao Hongwei, Chief researcher of China Academy of Railway Sciences: Our original CR400 braking response time is about 2.3 seconds, this time we want to increase to 1.7 seconds, the response time can further compress the braking distance of the train.
Not just braking systems, but every critical system, from traction power to network control to safety monitoring, has its own digital model. Through precise calculations, they found the key to making the train run fast, stop steadily, and consume less energy, that is, to make its "physical strength" stronger and "weight" lighter.
Zhao Hongwei, chief researcher at the China Academy of Railway Sciences: If we want to reach 400 kilometers per hour, we still need to increase the power. The traction power of the CR400 is 9,600 kilowatts, and on the CR450 the power reaches 11,000 kilowatts, and we also reduce the weight of the train.
A number of technical breakthroughs
Make sure the CR450 reaches 400 km/h
According to the known test data, the weight of the CR450 car is about 10 tons, which is about 12% less than the existing CR400 Fuxing train; At the same time, the operating resistance and energy consumption indicators are reduced by 20%; Braking performance and traction efficiency are improved by 20% and 3% respectively, so that the train can achieve an operating speed increase of 50 kilometers per hour to 400 kilometers per hour while the braking distance, noise and energy consumption indicators are unchanged.
The CR450 EMU prototype will roll off the production line this year
Since September 2017, the Fuxing CR400, China's standard EMU, has been put into operation on the Beijing-Shanghai high-speed rail line, setting a new benchmark for high-speed rail operation speed in the world at 350 km/h.
What new breakthroughs will be achieved in the speed of the CR450 EMU being developed, and when will it be off the line?
In the welding workshop of CRRC Changke, rows of robotic hands are welding CR450 bogies. The staff told reporters that the factory mainly uses robots to replace manual welding, and the production efficiency is greatly improved.
Xie Yuanli, chief operator of CRRC Changke Co., LTD. : The improvement of speed grade has put forward higher requirements for our welding process. Robot welding is completely in accordance with the walking path edited by the program, avoiding the interference of human factors, and can achieve no defects.
The development of the CR450 EMU is another technological breakthrough on the basis of the Fuxing CR400, the Chinese standard EMU that came off the production line in 2017, and the train's operating speed will be increased from 350 km to 400 km.
Since its launch in 2021, the CR450 Science and Technology Innovation Project has completed the development of 17 prototypes of new technology components, carried out 57 scientific research tests on CR400 comprehensive detection trains, and set new records for single EMU open line speed of 453 kilometers per hour, relative rendezvous speed of 891 kilometers per hour and tunnel rendezvous speed of 840 kilometers per hour.
Zhang Dayong, Director of the Science, Technology and Information Department of China Railway Group: At present, important progress has been made in the technological innovation of railway infrastructure with a speed of 400 km/h and the construction of a comprehensive test section with a higher speed. The CR450 EMU has completed the formulation of the top-level index and the overall plan, and has entered the construction design and sample vehicle development stage. The sample vehicle will be rolled off the production line within the year, and a series of tests will be carried out.
New lightweight materials are widely used
Leverage the big market of high-speed rail
The reporter learned in the interview that according to the design requirements, the CR450 EMU will increase its speed by 50 kilometers per hour at the same time, and the noise and energy consumption and other environmental indicators will not exceed the CR400 Fuxing train. This is due to the application of lightweight and efficient new materials and new technologies, at the same time, these new materials and new technologies have also led to the continuous upgrading of the high-speed rail industry chain.
The permanent magnet motor of CR450 traction system is the first application in China's commercial operation of high-speed trains. In the working state, it is charged at more than two thousand volts, one hundred revolutions per second, and the power is increased by 14.5%.
More than just permanent magnet materials containing rare metals, CR450 EMU uses a large number of carbon fiber composite materials, which have lower density than traditional materials, and have a series of technical indicators such as lightweight, high strength, high temperature resistance, fatigue resistance, etc., providing a preferred solution for high-speed train lightweight, which is conducive to vehicle weight reduction, speed increase and energy consumption reduction.
Nie Ying, overall senior director designer of CRRC Sifang high-speed EMU: What I am holding in my hand is a carbon fiber gaskets. Like CR450, equipment compartment and obstacle exhauster are all made of carbon fiber materials, which can reduce the weight by 30% compared with traditional materials, so that the body is lighter and the energy consumption is lower.
From 300 km/h to 350 km/h to 400 km/h, high-speed rail trains are running faster and faster, not only the materials are getting new, but also the entire high-speed rail industry chain is constantly improving and upgrading. At present, China has built characteristic industrial clusters closely related to high-speed rail in Changchun, Jilin Province, Qingdao, Shandong Province and Zhuzhou, Hunan Province.
Zhao Hongwei, chief researcher of China Academy of Railway Sciences: Like some host companies, they have a lot of supporting suppliers around them, forming an industrial scale of 100 billion. The development of high-speed rail has a very large pulling effect on the entire industrial transformation and upgrading.
Data Insights:
"Number" said high-speed rail scientific and technological innovation
The CR450 EMU, which will be offline within the year, will promote the technological innovation of China's high-speed railway EMU and infrastructure system, and fill the gap in the technical standard system of high-speed rail at 400 km/h. The relevant scientific research results obtained by the CR450 science and technology innovation project will be widely used in the field of railway construction and operation, further enhance the self-reliance ability of railway science and technology, and consolidate and expand China's world-leading advantage in high-speed rail technology.
Scientific and technological innovation makes high-speed trains run faster and faster. Relying on independent innovation, China's high-speed rail has continuously improved the level of infrastructure and mobile equipment, step by step, experienced 200 km/h, 250 km/h, 300 km/h, 350 km/h, and will open a new era of 400 km/h in the future. Today, China's high-speed railways have formed the world's largest operating network, with more than 45,000 kilometers of domestic traffic. Fuxing trains have reached 31 provinces, regions and municipalities, and more than 2.2 billion people have traveled on Fuxing trains.
Scientific and technological innovation brings the distance closer and closer. From 350 km/h to 400 km/h, the speed is increased by 50 km/h, which is not only a number, but also a reconstruction of space-time distance. The research shows that the best travel distance is less than 800 kilometers by taking the EMU at more than 200 kilometers per hour; At a speed of 300 kilometers per hour, the best travel distance is about 1,200 kilometers; At 400 km/h, the optimal travel distance will be extended to 1600 km.
Scientific and technological innovation makes the industry bigger and bigger. A train of Fuxing EMU is composed of about 500,000 parts, covering many technical fields such as machinery, metallurgy, materials, power electronics, chemical industry, information control, computers, precision instruments and so on. China Railway Group has led the establishment of a railway science and technology innovation alliance covering key enterprises, universities and research institutions inside and outside the railway industry to achieve deep integration of industry, university and research. From research and development, manufacturing, to operation and maintenance services of the whole chain of coordinated development, has formed 260 independent technical systems, design and production of EMU parts of the core enterprises more than 100, more than 2,100 associated enterprises, covering more than 20 provinces and municipalities in China.