"Oriental Time and Space" specially planned, New Productivity in China, visited China's six major scientific and technological innovation centers, focusing on the Chengdu and Chongqing regions.
In 2021, the Chengdu-Chongqing region was approved to build a technological innovation center with national influence.
Chengdu-Chongqing Region: Building a technological innovation center with national influence
Currently, it has 22 national key laboratories and 316 national-level scientific and technological innovation platforms.
In 2023, the Chengdu-Chongqing twin-city economic circle will achieve a regional GDP of 8.19867 billion yuan, accounting for 6.5% of the country and 30.4% of the western region.
Focus on building four trillion-level industrial clusters including equipment manufacturing, new energy vehicles, electronic information, and advanced materials.
In recent years, the Chengdu-Chongqing region has made rapid progress in the rail transit industry. In 2023, the total output value of the entire industry chain will exceed 400 billion. Chengdu has also become the only city in the rail transit field to enter the national future industrial park pilot.
In this issue, we will focus on the innovative exploration of this cluster in the Chengdu-Chongqing region, and first look at the overall situation.
Create a 100-billion-level rail transit industry cluster
This is the Chengdu-Chongqing National Science and Technology Innovation Center under construction.
In recent years, Chengdu and Chongqing have built a 100-billion-level industrial cluster in the rail transit field, and have formed a rail transit industry chain layout that integrates new manufacturing, maintenance, accessories, operation and maintenance, and services.
The first national key laboratory in the field of rail transit in my country was born here.
The world's largest mountainous urban rail transit operation network has been built, and the world's largest straddle-type monorail equipment manufacturing base has been cultivated. In 2023, the total output value of the entire rail transit industry chain in the Chengdu-Chongqing region will exceed 400 billion.
Higher speed train! How to repair the line? How are trains built?
Speaking of rail transportation, China's high-speed rail is a shining national business card. The Fuxing train with a speed of 350 kilometers per hour maintains the world's highest commercial operating speed of high-speed trains. If the speed is to increase in the future, how should the lines be repaired and the trains built?
Follow the reporter to the Chengdu-Chongqing Middle Line High-speed Railway under construction to find the answer.
This is the construction site of the Shu'an Tunnel of the Chengdu-Chongqing Middle Line High-speed Railway, which is under construction. The Chengdu-Chongqing Middle Line High-speed Railway connects Chengdu and Chongqing, two cities with a population of 10 million. It is also the first high-speed railway in China with a reserved speed of 400 kilometers per hour.
At the same time, it is also very likely to become the first stage for high-speed EMUs with a speed of 400 kilometers per hour.
At the beginning of the design of the Chengdu-Chongqing Middle Line High-speed Railway, there was a lack of domestic design standards for speeds above 400 kilometers per hour. How to build this railway became the first problem.
The National Key Laboratory of Rail Transit Transportation Systems at Southwest Jiaotong University is the first national key laboratory in the field of rail transit in my country.
The Academy of Sciences team led by Academician Zhai Wanming of the laboratory provided some theoretical analysis and optimized design, and the relevant results were eventually incorporated into the Chengdu-Chongqing Middle Line High-speed Railway Design Interim Specifications, which is my country's first design specification for a high-speed railway with a speed of 400 kilometers per hour.
The next challenge is how to build higher-speed EMU trains.
According to the requirements put forward by the National Railway Group Corporation, higher-speed EMUs must reduce weight, because the greater the mass, the greater the inertia, and the braking distance is longer, which has a great impact on energy consumption and safety.
However, the lighter the train is, the more it runs at high speed on rails, any bumps will be amplified, affecting the stability and comfort of the vehicle.
Wang Kaiyun, director of the National Key Laboratory of Rail Transit Carrier Systems at Southwest Jiaotong University:
Movement stability, whether it is our high-speed EMU or railway rolling stock, once it has poor movement stability or snakes and becomes unstable, it will It may cause the wheels to jump off the rails, causing a derailment and rollover accident.
In order to accurately analyze and optimize the operational stability of higher-speed trains, researchers conducted theoretical modeling and simulation analysis through bench tests to establish a physical model of the anti-snaking shock absorber.
After three months of simulation calculations and bench experiments, the parameters of the serpentine shock absorber were finally determined. The manufacturer will soon process the test samples and hope to conduct rolling vibration experiments as soon as possible to verify whether the expected results are achieved.
Wang Kaiyun and his team moved the entire EMU into the laboratory to conduct actual vehicle verification, not just parts. They believe that this can accurately observe whether the vehicle reaches critical speed and whether snake instability occurs, and thus verify the anti-snake behavior. Whether the shock absorber meets the design requirements.
Wang Kaiyun, director of the National Key Laboratory of Rail Transit Carrier Systems at Southwest Jiaotong University:
Our research is currently very successful. We have fed back this parameter to the manufacturer and plan to carry out mass production.
The leader leads Chengdu-Chongqing rail transit equipment manufacturing into chains and circles
In fact, there are many technical difficulties that need to be overcome through innovation in the construction of higher-speed EMU lines and trains. The program mentioned is only one of the links.
Innovation and upgrading in any field are inseparable from repeated exploration and experiments by scientific research teams, and the research and development results of a cutting-edge laboratory may drive the accelerated upgrading of the entire industry.
Precisely because they value this kind of science and technology innovation resources, many domestic advantageous enterprises have felt the strength and development opportunities of Chengdu and Chongqing science and technology innovation in their cooperation with this laboratory, including Southwest Jiaotong University, and have settled here, and the industrial agglomeration effect has become increasingly strong. Significantly.
At the beginning of this year, the "Chengdu Action Plan to Promote the High-Quality Development of the Rail Transit Industry" clarified that by 2025, the scale of the entire industry chain will strive to exceed 500 billion yuan.
New ideas for green and smart integration of urban rail construction in Chongqing’s mountainous areas
The Chengdu-Chongqing Science and Technology Innovation Center is a twin-city economic circle, and the rail transit industry is also developing in an integrated manner. After seeing Chengdu, I will go to Chongqing next.
Chongqing has the world's largest mountainous urban rail network. Chongqing Rail Transit Line 24 (Phase I) is the first fully autonomous rail transit line planned and constructed in Chongqing. It is also a key technology demonstration project for Chongqing's urban rail green and smart integration. In the green , low carbon, energy saving and other aspects have strict index requirements. Among them, the power supply system requirements completely change the traditional passive power supply method and adopt an active two-way converter technology system. For this reason, a national rail transit power supply system has also been built in Chongqing. The first full two-way converter traction station.
Xia Bo, head of the Chongqing Rail Group System Equipment Company:
Bidirectional converter technology has three main advantages. First, it replaces our traditional rectifier unit, making the equipment smaller.
The second is to improve power supply efficiency and achieve our goal of energy saving and consumption reduction.
The third is to stabilize the power grid voltage, improve power quality, and make our train operations more reliable and stable.
Active power supply has obvious advantages in theory. It can reduce DC power supply voltage fluctuation by more than 50%, save more than 10% of energy compared with traditional traction power supply systems, significantly reduce carbon emissions, and have obvious economic benefits. However, it is technically difficult to achieve.
Once a short circuit occurs during the power supply process, the huge current generated instantaneously will cause damage or even destruction of the entire power supply system if the shunt is not controlled in time.
Zhang Min, Chief Engineer of Chongqing CRRC Times Electric Co., Ltd.:
This is like a flash flood. If there are backup flood discharge channels to divert the flow, damage to the flood control dams and secondary disasters can be avoided.
Thanks to the long-term close cooperation between the company and Southwest Jiaotong University, the technical team of Chongqing CRRC Times Electric has participated in many major national scientific research projects such as the Baoshen Railway, and has accumulated deep experience in cutting-edge technologies of rail transit power supply systems.
In response to the technical requirements of Chongqing Rail Transit Line 24, Times Electric, together with Chongqing Rail Transit Research Institute and other units, conducted a large number of theoretical calculations and simulation analyzes on the system current, and replaced the traditional diode solution with a new thyristor bypass solution. Three-party experiments have verified that the short-circuit capability fully meets system requirements.
Chen Guangzan ,
director of the Technology Center of Chongqing CRRC Times Electric Co., Ltd
.:
Chongqing Orbital Company and railway companies are very tolerant of new technologies, which is conducive to leveraging our years of technological accumulation and application of new technologies, and working with Southwest Jiaotong University and others Universities can conduct technical exchanges during project practice and jointly make some innovative results in low-carbon and intelligent traction electric energy.
Encourage the joint development of the entire industry chain and continuously strengthen source innovation
Chongqing has always encouraged the collective development of the entire rail transit equipment industry chain, and at the same time relied on the scientific research strength of Chengdu and Chongqing to continuously strengthen source innovation.
Developing a green, low-carbon, energy-saving new power supply method for fully autonomous rail lines may only be a partial innovation in the entire industry chain, but it is precisely because of the industrial ecology of Chongqing Rail Transit that companies like Times Electric can We have the opportunity to cooperate with top scientific research institutions in the industry and continue to try new technologies and product research and development in various projects. Now, in addition to satisfying the domestic market, some of the core equipment products of these companies have also gone abroad and been exported to overseas markets such as Mexico and Pakistan. .
What are the characteristics of the Chengdu-Chongqing Science and Technology Innovation Center? Where to start from? Expert analysis↓↓
As a twin-city economic circle, the Chengdu-Chongqing Science and Technology Innovation Center will look at the characteristics and advantages of its overall development model and how it will develop in the future. Let’s listen to the analysis and interpretation of relevant experts.
Wang Luohan , associate researcher at the China Academy of Science and Technology Development Strategies
:
Based on its own characteristics, the Chengdu-Chongqing region has formed a new comprehensive development model that relies on a huge consumer market and is characterized by industrial cluster-style innovative development.
It is the "fourth level" in my country's economic map after Beijing-Tianjin-Hebei, the Yangtze River Delta, and Guangdong, Hong Kong and Macao.
The region has long-term reserves to attract high-end talents and has abundant scientific and educational resources. It has formed an industrial system with complete categories and relatively strong basic strength in the market competition.
There are 9 national-level industrial clusters and 2 national strategic emerging industry clusters.
In the future, the Chengdu-Chongqing region should focus on national strategic needs, adhere to a problem-oriented and systematic concept, aim at strategic high-tech development, maximize the release of resource advantages, and create a centralized hosting site for original innovation clusters and research bases.
Chengdu-Chongqing coordinated development promotes cross-regional flow of high-quality scientific and technological resources
In order to collaboratively promote key core technology research, the science and technology departments of Chengdu and Chongqing have broken the restrictions of administrative divisions, integrated innovation, and achieved win-win cooperation, and jointly implemented 115 core technology research projects, investing more than 100 million yuan.
At the same time, we will accelerate the construction of a full-cycle, full-chain, market-oriented achievement transfer and transformation system.
Focusing on areas such as artificial intelligence, advanced manufacturing, big health, energy conservation and environmental protection, and modern agriculture, we will build innovation platforms such as the Sichuan-Chongqing Key Laboratory and vigorously promote the transformation and industrialization of scientific and technological achievements.
News Commentary: How to develop new productive forces according to local conditions?
New productive forces in China.
We spent six days following reporters to visit and investigate six major science and technology innovation centers under construction in Beijing, Shanghai, the Guangdong-Hong Kong-Macao Greater Bay Area, Xi'an, Wuhan, and Chengdu.
In each place, we focus on a local characteristic and advantageous industrial cluster, and discover and record the stories between innovation platforms and innovation teams from multiple frontier fields such as artificial intelligence, biomedicine, electronic information, aerospace, optoelectronic information, and rail transportation.
How should we understand and exert our efforts in “developing new productive forces according to local conditions”?
Wu Sa,
deputy director of the Economic Research Institute of the China Academy of Macroeconomics
: China's six major science and technology innovation centers have gathered innovative resources, built service platforms, opened up industrial choke points, and become the main source and incubator of new productivity; in promoting the development of new productivity In the process, we must proceed from reality, establish first and then break, adapt measures to local conditions, and provide classified guidance.
In the next step, we must continue to strengthen technological innovation, establish and improve a technological innovation transformation system, and focus on building industrial clusters with core competitiveness.
(CCTV News Client)