Views: 4 Author: Site Editor Publish Time: 2019-08-02 Origin: Site
Do you remember the amazing first flight of C919? When a plane is flying smoothly, it often feels like it's on the level when it's in the cabin with very low air density at an altitude of 10,000 meters. Why? The North Airlines man gave the answer!
Cai Maolin: That's because the cabin is pressurized and sealed for oxygen supply. But the conditions are harsh. Process control requires precise, once the pressure is overshoot, the body will be scrapped, and the slight change of temperature in the process of pressure will also interfere with the judgment of air leakage.
C919, ARJ21 and other domestic passenger aircraft cabin air tightness testing equipment control system, which is developed by Professor Cai Maolin of Beihang.
On the morning of January 8, 2018, the Central Committee of the Communist Party of China and the State Council solemnly held the National Science and Technology Award Conference in Beijing. Professor Cai Maolin, School of Automation Science and Electrical Engineering, Beijing University of Aeronautics and Astronautics, jointly worked with Beijing University of Technology, National Pneumatic Product Quality Supervision and Inspection Center and Wuxi Pneumatic Ownership Co., Ltd. to study and put forward the "Key Common Testing Technology and Standard System for Pneumatic Components" and obtained the second national scientific and technological progress. First prize.
The airtightness detection of engine room is essentially a kind of "leakage detection". Flow rate, energy efficiency and leakage are the three main aspects of "key common detection technology for pneumatic components".
Pneumatic Component: Muscle of Industrial Automation
What is a pneumatic component? Cai Maolin gives an example of why high-speed rail is comfortable to ride.
This is the function of pneumatics.
The pneumatic shock absorber spring under the high-speed railway carriage can reduce the high and low frequency vibration caused by the fluctuation of rail height.
Pneumatic components are almost everywhere in our life. One of the three power systems in industry is pneumatic system, which is widely used in automation and process control equipment of manufacturing industry. Therefore, pneumatic components are also vividly compared to the "muscles of industrial automation".
In 2015, China put forward "Made in China 2025", which is the program of action for the first decade of implementing the strategy of manufacturing power. As a basic component, small pneumatic components are one of the key components in China's manufacturing from large to strong. They are large in quantity and wide in scope. They are the key components to support high-end equipment, such as high-speed pneumatic shock absorber spring and its servo control valve.
Cylinders, reversing valves, pressure relief valves, etc. are all pneumatic components. The figure shows some pneumatic components.
Pneumatic components are the key upgrading objects of "strong foundation engineering" in China. The construction of its quality assurance system is an important basis for the development of advanced manufacturing technology in China, and also an important index to measure the manufacturing level and advanced nature of a country.
The development of China's pneumatic industry is lagging behind. High-performance components all rely on imports, resulting in a large but not strong manufacturing industry in China. Insufficient detection technology and capability of key performance seriously restrict the development of high-end equipment.
The need of the motherland is the choice of Beihang people!
Overcoming Difficulties: "Complete Standard System has been Built"
Cai Maolin's team is determined to solve the "pneumatic" problem. Based on the cooperation of industry, University and research, they carry out the innovation of key detection methods and technologies from R&D, manufacturing to use, and engage in the research of meeting the technical standards of high performance devices.
Team research has established a complete standard system with international advanced level, which is composed of general basic pneumatic components, product and method standards. Relevant testing projects have been successfully applied to high-end equipment such as aerospace, breaking the international monopoly and effectively promoting the "strong foundation project".
Cai Maolin: In the past, homogenization competition in this industry was very fierce. With quality standards, it promoted the standardization and progress of the industry greatly, and the export volume of products was also rising rapidly.
"In standard setting, China has entered the first array." Cai Maolin said proudly. Nowadays, China has reached 55 standards in related fields, which has surpassed the United States and the European Union.
Cai Maolin's team has revised 34 standards for more than ten years, contributing "half of the country".
"Science has only one answer"
Globally, Japan is one of the most advanced countries in the field of aerodynamics. In 1997, Kyoto Protocol was signed in Japan, and energy saving and emission reduction have gradually become the consensus of all mankind.
This year, Cai Maolin is engaged in aerodynamic learning and research at SMC Tsukuba Technology Center, the largest aerodynamic research and development base in the world. Subsequently, he went to Tokyo University of Technology to pursue his doctorate.
In the theory of aerodynamic energy evaluation, Cai Maolin has studied it for more than a year and achieved initial results. But his evaluation method is quite different from the traditional method, and the evaluation data is far less "bright" than before. Cai Maolin was even interviewed by the technical director of the world's leading pneumatic component manufacturer in the global market share, questioning his research results.
Cai Maolin: Science has only one answer.
Even if questioned, it doesn't matter. It has to be tested over time.
In 2002, Cai Maolin won the Academic Paper Award of the Japanese Society of Hydrodynamic Systems (the only one in the field of aerodynamics in that year). His pioneering concept of "Pneumatic Power" solves the problem of energy evaluation that has plagued the aerodynamic industry for many years.
Cai Maolin's Ph.D. dissertation won the Academic Paper Award of the Japan Society of Hydrodynamic Systems
After years of improvement and testing, the energy efficiency evaluation and testing methods of pneumatic components proposed by its team have been adopted and formulated as the national standard of GB (GB30833), which was formally promulgated and implemented in 2014. The research results have also been adopted by Japan as Japan's industry standard (JFPS 2018), and Cai Maolin's team is making it an ISO international standard.
In the eyes of students, "Teacher Cai is a man who exists like a god" and "is so rigorous that people are convinced". "Teacher Cai has always taught us to be down-to-earth and diligent in our work. There are no shortcuts to scientific research, let alone ambiguity." Shi Yan's first academic paper is still fresh in his memory. "Teacher Cai helped me change it word by word."
Speaking of his students, Cai Maolin can hardly hide his pride and treasure their achievements. This time, he won the second prize of the state. Shiyan, Xu Weiqing and Yu Qihui in the list of completors all participated in the research as doctoral candidates of Beihang Airlines. Research on pneumatic technology, formulate industry norms, educate enterprises on energy conservation, and cultivate vitality... Cai Maolin's theory is put into practice, he is determined to go ahead and write his thesis on the motherland, which has made a far-reaching contribution to the "dream of building a powerful country".
Beihang people's footsteps, never stop!