① Applied Mechanics 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.
(2) Jet Propulsion and Aerospace Technology From the 1940s to the early 1960s, Qian Xuesen put forward some important concepts in the field of rockets and aerospace: in the 1940s, a rocket-assisted take-off device was proposed and realized, 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, the engineering practice of designing stability and guidance systems is the main research object. 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.
⑤ Systems Engineering Qian Xuesen not only refined the practice of China aerospace systems engineering into the theory of aerospace systems 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.
⑥ System Science Qian Xuesen's most important contribution to system science is that he developed systematics and methodology of open 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 to create a scientific and technological department of thinking science, and scientifically summarized the ideas that had been discussed and debated in China's philosophical circles in the 1930s, but could not be clearly expressed at that time.