Seek the deeds of Qian Xuesen and Zhan Tianyou.

Main contribution

Qian Xuesen

① Applied mechanics

Qian Xuesen

Qian Xuesen has done pioneering work in aerodynamics and solid mechanics of applied mechanics; The research on compressible boundary layer carried out in cooperation with von Carmen reveals some temperature changes in this field, and the Carmen-Qian Xuesen method is established. In cooperation with Guo Yonghuai, the concept of upper and lower critical Mach numbers is introduced into transonic flow for the first time.

② Jet propulsion and space technology

From the 1940s to the early 1960s, Qian Xuesen put forward some important concepts in the field of rockets and aerospace: in the 40s, he put forward and realized the rocket flying aid device (JATO), which shortened the runway distance; 1949, put forward the concept of rocket passenger plane and the idea of nuclear rocket; 1953 studied the possibility of interplanetary flight theory. In "Introduction to Interstellar Navigation" published by 1962, the concept of a round-trip transportation system between heaven and earth is put forward, in which a large aircraft equipped with a jet engine is the first-stage vehicle and an aircraft equipped with a rocket engine is the second-stage vehicle.

③ Engineering cybernetics

In the process of its formation, engineering cybernetics focuses on the engineering practice of designing stability and guidance systems. Qian Xuesen himself is the pioneer of this kind of research work.

④ Physical mechanics

Qian Xuesen's research on combining the physical, chemical and mechanical properties of rare gases in 1946 is a pioneering work. 1953, he formally put forward the concept of physical mechanics, and advocated to determine the macroscopic mechanical properties of matter from microscopic laws, which changed the previous method of measuring mechanical properties only by experiments, greatly saved manpower and material resources, and opened up a new field of high temperature and high pressure. 196 1 year, the Lecture Notes on Physical Mechanics edited by him was officially published. Now the leader of this subject is Professor Gou Qingquan. 1984, Qian Xuesen suggested to Gou Qingquan that physical mechanics should be extended to the engineering and technical field of atomic and molecular design.

⑤ System engineering

Qian Xuesen not only refined the practice of China's aerospace system engineering into the theory of aerospace system engineering, but also put forward the concept of the overall design department of national economic construction in the early 1980s. He also insisted on applying the concept of aerospace system engineering to the whole country and national economic construction, and discussed the social system from the perspective of social form and open complex giant system. The social form of any society has three aspects: economic social form, political social form and ideological social form. Qian Xuesen proposed to divide the social system into three parts: social economic system, social political system and social consciousness system. Corresponding to the three social forms, there should be three kinds of civilization construction, namely, material civilization construction (economic form), political civilization construction (political form) and spiritual civilization construction (ideology). The construction of socialist civilization should be the coordinated development of these three civilizations. From a practical point of view, it is social system engineering that ensures the coordinated development of these three civilizations. From the reality of reform and opening up, we need not only economic system engineering, but also social system engineering.

⑥ System science

Qian Xuesen's most important contribution to system science is that he developed systematics and methodology of opening complex giant systems.

⑦ Thinking science

Artificial intelligence has become a hot topic in the world, but academic thoughts are in a state of chaos. In this context, Qian Xuesen stood at the forefront of the development of science and technology, proposed the establishment of noeticscience Science and Technology Department, and scientifically summarized the ideas that had been discussed and debated in China's philosophical circles in the 1930s, but could not be clearly stated at that time. Outstanding contributions are as follows:

(1) In the early 1980s, Qian Xuesen proposed to establish the Department of Thinking Science and Technology. He believes that thinking science is a science dealing with consciousness and brain, spirit and matter, subjective and objective, and is a major department of modern science and technology. The need of computer technology revolution has promoted the scientific research of thinking.

(2) Qian Xuesen advocated that the development of thinking science should be combined with the work of artificial intelligence and intelligent computers. According to his personal experience in developing applied mechanics, he pointed out that the research of artificial intelligence and intelligent computer should take applied mechanics as a reference, take the road of integrating theory with practice, and actually need theoretical guidance. The theoretical basis of artificial intelligence is the basic scientific thinking in thinking science. The way to study thinking is to look for it from the achievements of philosophy, and thinking actually evolved from philosophy. He also believes that the establishment of image thinking is a breakthrough in the current scientific research of thinking, and it is also the core issue of artificial intelligence and intelligent computers.

(3) Qian Xuesen applied the systematic scientific method to the research of thinking science, and put forward the systematic view of thinking, that is, based on the thinking process of logical units, he gradually built a first-order thinking system with a single thinking type, that is, he built abstract thinking, image (intuitive) thinking, social thinking and unique thinking (inspirational thinking). The second is to solve the problem of second-order open thinking system; Finally, decision-making consultation is an open giant system with high-order thinking.

⑧ Scientific and Technological System and Marxist Philosophy

Qian Xuesen believes that Marxist philosophy is the highest generalization of human understanding of the objective world and modern science and technology (including scientific and social sciences). Qian Xuesen summarized the development of contemporary science and technology into ten closely related science and technology departments. The division method of these ten science and technology departments is another innovation of Qian Xuesen's scientific classification method by using Marxist philosophy, especially system theory.

Tianyou Zhan

Zhan Tianyou and Tianjin-Tangshan Railway

From 65438 to 0888, Zhan Tianyou was recommended by his old classmate Mou to be an engineer in China Railway Company. Zhan Tianyou, which has been lost for seven years, has the opportunity to join the railway industry of the motherland. At this time, it was the construction of the Tianjin-Tangshan Railway. He didn't want to stay in Tianjin for a long time, so he went to the construction site to share joys and sorrows with the workers. As a result, it was completed and opened to traffic in only 80 days. However, Li Hongzhang played the role of the Englishman Jinda and promoted Jinda as the chief engineer. Zhan Tianyou's works were therefore copied.

Built the Luanhe River Bridge.

1890, the Qing government repaired the internal and external railways (now Beijing-Shenyang Railway), and Jinda was the chief engineer. 1892, the project goes to Luanhe Bridge, and many countries want to win this business. Of course, Jinda took the Englishman first, but the Englishman Cox failed because the bridge could not be built. Contractors from Japan and Germany also failed. As the delivery deadline approaches, Jinda has to ask Zhan Tianyou. Zhan Tianyou made a detailed analysis of the reasons for the failure of various countries, and made a thorough survey of the geological soil at the bottom of Luanhe River. Later, he decided to change the pile location, adopt the traditional method of China, dive into the bottom of the river with divers from China, cooperate with machine operation, successfully complete the piling task, and build the Luanhe River Bridge. This victory has strengthened the ambition of the people of China. 1894, the British Engineering Research Association elected Zhan Tianyou as a member of the Association. Since then, Zhan Tianyou has led the construction of the Beijing-Tianjin Railway and Pingyao Railway (Pingxiang to Liling).

Build Xinyi Railway

In order to please Nora, Yuan Shikai invited to build a Xinyi Railway (Gaobeidian to Yixian) in 1902 for the royal family to worship their ancestors. Nora is naturally willing to take the train to worship her ancestors. In order not to miss the use of ancestor worship in 1903, Yuan Shikai was ordered to finish it within half a year. Yuan Shikai appointed Zhan Tianyou as the chief engineer. Although this road is of little value, it is the beginning for China people to build their own railways. So Zhan Tianyou still attaches great importance to it. Zhan Tianyou completely abandoned the routine that foreigners had to air dry the roadbed for one year before laying the track. It took only four months to build the Xinyi Railway at a very low cost. It greatly encouraged the people of China to build their own railways and laid a good foundation for the later construction of the Beijing-Zhangjiakou Railway.

Zhan Tianyou builds Beijing-Zhangjiakou Railway.

Zhangjiakou is the hub of Beijing's entry into Inner Mongolia, the channel for tourists and businessmen from north and south, and has always been a battleground for military strategists. Therefore, the Beijing-Zhangjiakou Railway has important economic and political value. As soon as the news that the Qing court was going to build the Beijing-Zhangjiakou Highway came out, Britain, the most influential country in China, was determined to win. Russia, which regards the north of the Great Wall as its sphere of influence, will never give in and the two sides will not give in to each other. Finally, an agreement was reached: if the Qing court did not borrow foreign debts and needed foreign craftsmen, the road would be built by China people, and neither side could reach out. In this way, the Qing government gave up the idea of asking foreigners for help and devoted itself to self-study.

1905 In May, the Engineering Bureau of Beijing-Zhangjia Railway Administration was established, with Chen Ren as general manager and Zhan Tianyou as general manager and chief engineer. 1906, Zhan Tianyou was promoted to general manager and chief engineer. Zhan Tianyou clearly knows the difficulty of this task. He must first resist cynicism from all sides: some people say that he is "overreaching", "only spending a few dollars" and even "daring". In a letter to Mrs Northrop, an American teacher, he said: "If the Beijing-Zhangjiang project fails, it will be not only my misfortune, but also the misfortune of China engineers, and it will bring great losses to China. Before and after I accepted this task, many foreigners publicly declared that China engineers could not undertake the arduous project of masonry and cave dwelling on the Beijing-Zhangjiakou line, but I persisted in my project. " . It fully embodies the patriotism and sense of national responsibility of China intellectuals.

Zhan Tianyou has surveyed three routes, and the second detour is too far. The third is today's abundant sand line. Due to the limited funds allocated by the Qing court and the short time, Zhan Tianyou decided to adopt the first route, that is, from Fengtai to Zhangjiakou via Xizhimen, Shahe, Jingnankou, Juyongguan, Badaling, Huailai, Ji Ming Post and Xuanhua, with a total length of 360 miles. The difficulty of the whole line is to close the ditch, where the mountains overlap and the cliffs are steep and varied. The difficulty of the project was not found in the whole country at that time, and it was rare in the world. The slope is very large, and the height difference between Nankou and Badaling is 180. Zhan Tianyou divides the whole line into three sections: Fengtai to Nankou as the first section, Nankou to Kangzhuang as the second section, and the rest as the third section.

1In August, 905, the Beijing-Zhangjiakou Railway was officially started, and intense exploration and route selection began. Zhan Tianyou personally led the students and workers, carrying benchmarks and theodolite, running around the rugged mountains day and night. One evening, the fierce northwest wind roared in Badaling area, whizzing past with dust, which made people unable to open their eyes. The survey team finished the work in a hurry, filled in the survey figures and climbed down from the rock wall. Zhan Tianyou took the notebook, looked at the figures and asked doubtfully, "Is the data accurate?" ? "Almost," replied the surveyor. Zhan Tianyou said seriously: "The first requirement of technology is accuracy, and there can be no ambiguity or rashness. Statements like' probably' and' almost' cannot come from engineers. " Then, he picked up the instrument, braved the wind and sand, climbed to the rock wall again with difficulty, carefully surveyed it and corrected a mistake. When he came down, his lips were purple with cold.

Soon, exploration and construction entered the most difficult stage. At Badaling and Qinglong Bridge, there are overlapping mountains and steep walls hanging rocks. Four tunnels will be opened, and the longest one is 1 100 meters, which is three times that of Juyongguan. After accurate calculation, Zhan Tianyou decided to adopt the method of sectional construction: simultaneously drilling from the north and south ends of the mountain, opening a large well in the middle of the mountain, and then drilling from the north and south ends in the well. This not only ensures the construction quality, but also speeds up the project progress. When digging a hole, I dug a lot of stones by hand and picked out the spewing spring water one by one. Zhan Tianyou, as the chief engineer, has no shelf. He digs stones and carries water with the workers, and his face is covered with mud and sweat. He also encouraged everyone to say, "The Beijing-Zhangjiakou Railway is the first railway that we built with our own people and our own money. The eyes of the whole world are watching us, and we must succeed! " "No matter success or failure, it is definitely not our own success or failure, but the success or failure of our country!" In order to shorten the construction period, Zhan Tianyou came up with the "shaft excavation method" and created the herringbone line for the train to climb the mountain. These methods have played a very important role now.

/kloc-0 started construction on September 4th, 905, and/kloc-0 started track laying on February 6th, 2. On the first day of track laying, the coupler chain of an engineering vehicle broke, causing derailment accident. This has become evidence that China people can't build their own railways, and all kinds of slanders have poured in. However, Zhan Tianyou didn't panic, but thought calmly: the slope of this road is extremely high, and the connection performance between cars is slightly unstable, so the accident is hard to avoid. To this end, he used the method of automatic hook and finally solved this problem.

On September 30th 1906, all the first blocks of the project were opened to traffic, and the second blocks started at the same time. The difficulty lies in the second quarter. First of all, we must open four tunnels: Juyongguan, Wuguitou, Shifosi and Badaling. The longest length of Badaling Tunnel is1.092m.. This requires not only accurate calculation and correct command, but also new mountain cutters, ventilators and pumps. The former is not a problem for Zhan Tianyou, while the latter is not available in China at that time, and it can only be imagined by the hands of workers. However, they used the shaft to cut hair, but they overcame many difficulties and finally completed the second bid section on September 1908.

The difficulty of the third bid section is second only to that of Guangou. The first one is Huailai Bridge, the longest bridge on Zhangjing Road, which is erected by 7 steel beams 100 feet long. Thanks to Zhan Tianyou's correct command, it was completed in time. April 2 1909 train goes to Xiahuayuan. Although the section from Xiahuayuan to Jimingyi mining area is not long, the project is extremely difficult. On the right is Yanghe River, and on the left is Rocky Mountain. A six-foot-deep tunnel should be opened on the mountain, and a seven-mile-long riverbed should be padded under the mountain. Zhan Tianyou paved the river bed at the foot of the mountain with stones paving the road on the mountain. In order to prevent mountain torrents from impacting the subgrade, cement bricks were used for protection, and the third section was successfully completed.

Zhan Tianyou never paid attention to the engineering difficulties, but Zhan Tianyou was extremely worried about man-made obstacles. There is a man named Guangzhai in Qinghe. He used to be a Taoist priest and a relative of the royal family Zaize. Both the ruling and opposition parties have influence. As soon as the railway passed its grave, he led the crowd to make trouble, stopped the project, and bribed heavily in private to demand diversion. The postal department is afraid to ask. There is the tomb of King Zheng in the north, the tomb of eunuchs in the south and the tomb of Nora's father Guigong in the west. I wonder how much time and money will be wasted to divert traffic. Zhan Tianyou is ashamed of taking bribes, never misappropriating them, and strives to stay or stay. Finally, because the five ministers were bombed when they went abroad, Zaize was too scared to talk about foreign affairs. Guangzhai agreed to pass through the grave wall because he lost his backer. The completion ceremony of the Beijing-Zhangjiakou Railway was originally scheduled to be completed in six years, and Zhan Tianyou was finally opened to traffic in August of 1909 and1,two years ahead of schedule, saving 282,000 silver. The successful completion of the Beijing-Zhangjiakou Railway is a victory for the people of China and a full expression of the patriotic spirit of patriotic intellectuals in China.

Imperialism always wants to seize this road. At the beginning of the project, Japanese Yujiro wrote to Yuan Shikai at the imperial gate, saying: China people can't afford to build this road, so it's safer to ask Japanese technicians. The Englishman Jinda also came to intercede for Japan. Zhan Tianyou flatly refused to hire any foreigners on this road. After the Juyongguan tunnel project started, hordes of foreigners often came to spy in the name of hunting, hoping that the project would fail in order to take advantage of people's danger. Zhan Tianyou set the tone for the people of China with excellent results.

After the completion of Zhangjing Road, Zhan Tianyou was employed by Guangdong Commercial Yuezhong Railway Corporation as the company's prime minister in May 19 12, and concurrently served as the office of John-Sichuan Railway Association.

Establish China Engineering Society.

After the Revolution of 1911, in order to revitalize the railway industry, Zhan Tianyou and his colleagues established the China Engineering Society, and was promoted to president. During this period, he devoted a lot of efforts to the training of young engineers and technicians. In addition to setting an example, he also encouraged young people to "study hard for invention" and asked them not to "favor one over the other, and not to fish for fame". Take others with sincerity, not yourself as a mirror. "

Representing China Government in the International Conference on Far East Railway.

19 19 after the first European war, Zhan Tianyou attended the international conference on the Far East Railway on behalf of the China government, braved the cold and rushed to the conference site to argue with the Japanese representative who tried to occupy the North Manchuria Middle East Railway in China, and obtained China's right to protect the Middle East Railway. On his way home, he climbed the Great Wall again and suffered from illness. He sighed: "Life has ups and downs, and the original road network dream made me regret it until the end. Fortunately, my life can be turned into a track crawling on the land of China ... "His persistent deeds of fighting against the great powers on the railway front, as well as his high integration of national spirit and scientific spirit, will be left to us forever together with the bronze statue set up for him by later generations.