1958- 1960, in order to solve the problem of multi-point synchronous control of ship lift in the scientific research task of the Three Gorges, Tu proposed and developed a multi-motor "self-coordinated" rotation system. 1960, 25-year-old Tu stood out and published a research paper on multivariable "coordinated control" at the first IFAC World Academic Conference. This paper puts forward some new ideas, such as controlling the deviation according to coordination, self-correcting the internal given quantity, establishing the coordinated connection of controllers, realizing the "coordination" of variable systems, and the theoretical method of "coordinated control", in order to speed up the process of coordinated control, improve the coordination accuracy and maintain the stability of the coordinated system.
The theory and method of coordinated control put forward by young scholars in China have attracted the attention of control theorists at home and abroad. 1964, the Ukrainian Academy of Sciences of the Soviet Union cited "coordinated control theory" to study the speed coordinated control system of continuous rolling mill. 1980, Qian Xuesen and Song Jian changed "non-interactive control" to "coordinated control" in the sixth chapter of their masterpiece "Engineering Cybernetics" (revised edition). At present, the theory and method of coordinated control have been widely used in various multivariable control systems, such as multi-motor synchronous control of ship lift, partial transmission control of paper machine, multi-stand coordinated control of continuous rolling mill, radar multi-degree-of-freedom servo system, tension coordinated control of high-speed sizing machine, quasi-triaxial satellite attitude coordinated control, chemical process component proportion coordinated control, thermal process kiln temperature coordinated control, power system load balanced coordinated control and so on. It has produced great social and economic benefits.
The theoretical method of "most economical control" is put forward.
1977- 1978, Tu, as one of the overall leaders, undertook the national key scientific research task "scientific satellite attitude control system". In order to solve the difficulty of insufficient funds, he put forward a new scheme of "quasi-three-axis stable attitude control system for astronomical satellites" by using the coupling effect of objects and two sets of measuring devices and control mechanisms. On this basis, in 1979, he put forward new concepts of control system such as "most economical control", "most economical observation", "controllability of classification" and "observability of classification", and gave the basic framework and system design method of "most economical control theory and method".
The "most economical control" is to minimize the control equipment and operating costs under the premise of meeting the technical objectives and control requirements, so as to realize the "economy" of the control system. Many master's and doctoral dissertations have made in-depth research on "the most economical control theory and method" and its application, and have been successfully applied to automation systems in power, paper, cement, petroleum and other industries, forming a new branch with China characteristics in the field of control theory research and application. The theory and method of "most economic control" have also had an impact in western developed countries. 1987, 1990, Harvard University, University of California and Royal Swedish Institute of Technology invited Professor Tu Xuyan to give a lecture on the theory of "the most economical control", which had a good influence.
Founder of a new branch of "cybernetics of large-scale systems"
Tu is the earliest scholar who carried out research and teaching on the theory and application of large-scale systems in China, and the founder of the new branch of "cybernetics of large-scale systems". 1977 published the first paper "Large-scale System Theory and Its Application" in China. 1979 published the paper "Several Issues on the Theory of Large-scale Systems". In the same year, he opened the course of "Large-scale System Theory" for China Automation Society and the National Modern Control Class held in Tsinghua University. 1985 In order to solve a series of problems faced by the theory of large-scale systems, new methods and approaches for modeling, analysis and synthesis of large-scale systems are discussed. Based on the combination of artificial intelligence, knowledge engineering, control theory and system engineering, a new branch of cybernetics-cybernetics of large-scale systems is established. Qian Xuesen pointed out in the article "Innovation in the Theory of Large-scale Systems": "When solving the system engineering problems of large-scale systems, it is a breakthrough in cybernetics to directly quote some empirical knowledge and use the method of expert system", and "Cybernetics of large-scale systems is a technical science … it is the development of cybernetics". Since 1986, Tu has conducted in-depth research on the theory, method and application of "cybernetics of large-scale systems", and has made a series of research achievements in "generalized modeling", "intelligent optimization method", intelligent control, intelligent management and system structure design of large-scale systems. On the basis of summarizing the research results, he wrote and published the monograph Cybernetics of Large-scale Systems, which is the foundation work of this new branch of Cybernetics of Large-scale Systems.
Pioneer of artificial intelligence
Tu Xuyan is an academic leader and pioneer in the field of artificial intelligence in China. His pioneering work in this field fully embodies his pioneering and innovative spirit in academic thought.
(1) Take the lead in researching "intelligent control" and developing new methods of "intelligent control". 1976, Tu took the lead in developing intelligent control research in China. 1977 published the first paper on "intelligent control" in China. During 1980' s tenure as director of Hebei Institute of Automation, he presided over the development of intelligent controllers such as "self-optimizing controller" and "fuzzy controller" and won several provincial scientific and technological progress awards. 1986 undertakes the national natural science foundation project "intelligent control system", and puts forward new methods such as "multilevel self-optimizing intelligent controller", "multilevel fuzzy control" and "production self-learning control".
(2) Take the lead in studying biological cybernetics, and put forward new views on the principle of acupuncture anesthesia and the essence of meridians. In 1972- 1977, the principle of acupuncture anesthesia and the essence of meridians were discussed by using the method of "cybernetics", and new viewpoints such as "acupuncture anesthesia-multi-level collaborative analgesia process" and "meridians-human control system" were put forward. On the basis of summarizing relevant research results, Tu, as the first author, wrote the first monograph on biological cybernetics in China.
(3) Take the lead in putting forward the new concept of "intelligent management" and developing new technologies of "intelligent management". In 1985, Tu proposed a new concept of "intelligent management" and a new method of "multilevel expert system" to realize intelligent management. He put forward and developed new technologies of intelligent management system, such as generalized management model, intelligent optimization method, multi-database collaborative management software and man-machine coordination interface, which pointed out the development direction for the research and development of a new generation of computer management information system, and was applied in foreign trade contract intelligent management system, governor's office system, engineering construction intelligent decision-making system, metallurgical and petroleum enterprise management automation system and other computer management systems. On the basis of research and application, Tu completed his third monograph, Intelligent Management.
(4) Take the lead in researching artificial intelligence and developing expert system. During 1976, Tu Xuyan began to study artificial intelligence. Under his leadership, the Cybernetics Group of the Institute of Automation of the Chinese Academy of Sciences developed the world's first expert system of traditional Chinese medicine —— "Guan Youbo's expert system for diagnosis and prescription of liver diseases in traditional Chinese medicine", and put forward the fuzzy logic expression method of traditional Chinese medicine knowledge and the "double-blind test" method of expert system, which had a wide impact. From 1986 to 1990, Tu presided over the national key scientific and technological projects during the Seventh Five-Year Plan period, creatively applied the method of combining "artificial intelligence" with "large-scale system theory", solved the contradiction between the comprehensiveness of application fields and the professionalism of expert systems, made breakthrough progress in the design method and implementation technology of the third generation of large-scale expert systems, and obtained the National Seventh Five-Year Plan. 1988, Tu compiled a book "Artificial Intelligence and Its Application" on the basis of summarizing the scientific research achievements and teaching experience in artificial intelligence, which was selected as a textbook compiled by colleges and universities, and won the first prize of 1992 excellent textbook of the Ministry of Electronic Industry. 1994 tu xuyan was elected as one of the far east presidents of the world expert system congress.
Li Tao's disciples are all over China.
Tu is not only a professor and doctoral supervisor at University of Science and Technology Beijing, but also a part-time or honorary professor at the Graduate School of China Academy of Sciences, Tsinghua University and other domestic universities, and a visiting professor at new york State University, California State University and Michigan University. He has personally instructed more than 100 doctoral and master students, and even more students have listened to his lectures. His disciples are all over the world and have trained a large number of senior scientific and technological talents for the country.
Tu Xuyan has always had high standards and strict requirements for the cultivation of students. He asked students to be honest, rigorous and think independently on scientific research and academic issues, and never allowed any slack and tricks. He often leads his disciples to attend various academic conferences, personally drafts the outline of papers with them, revises academic reports, and improves their academic level and writing ability. Often lead graduate students to participate in the negotiation and demonstration of scientific research projects, the transfer and promotion of scientific research results, so as to cultivate their talents in scientific research management and application development. Tu Xuyan is active in various academic conferences at home and abroad. He not only puts forward inspiring new ideas and methods in academic reports, but also often improvises poems, which is called a "genius" in scientific and technological circles. On holidays, he and his wife often get together with students, sing and dance, and write poems and inscriptions. His unique scholar style and poet temperament are perfectly combined, which gives students rich enlightenment and is deeply respected and loved by students.