China Aerospace
The China Academy of Launch Vehicle Technology, located in the eastern highlands of Beijing, is known as the "cradle of chief designers" in the aerospace industry. Here, a white-haired elder who passes by casually may be a scientific master at the level of a "chief teacher". And Academician Yu Menglun is such a scientific master.
As a pioneer in the ballistic design of ballistic strategic missiles and launch vehicles on the mainland, Academician Yu Menglun is not only a stickler for the grassroots aerospace posts, but also a "super code farmer" who has been working silently at the grassroots level for more than 60 years. He always has a flash of inspiration when faced with problems, showing the demeanor of a "blue-collar academician".
The Chinese astronaut who lifted the rocket said he was just a "code farmer"
Behind every rocket liftoff, there are countless Chinese astronauts who silently lift rockets, and Yu Menglun is one of them.
In 1960, he graduated early from the Department of Mathematical Mechanics of Peking University and was assigned to the General Department of the First Branch of the Fifth Research Institute of the Ministry of National Defense at that time, where he calculated the flight path for missile and rocket launches.
In 1965, the mainland began the development of a certain type of missile in the Dongfeng series, and Yu Menglun was one of the three members of the ballistic design team. In the face of the long flight distance, how to conduct the test has become a difficult problem in front of them. Just when everyone was helpless, Yu Menglun put forward a bold idea - a special ballistic scheme combining low trajectory and high trajectory, and split the whole test into two separate tests.
The hand-cranked computer shakes out the initial missile trajectory
Initially, in order to design the trajectory of the missile, Yu Menglun and his colleagues needed to carry out a large number of heavy manpower calculations every day, and the hand-cranked computer was his closest comrade-in-arms.
The calculation principle of the hand-cranked computer is completed through gear transmission, and Yu Menglun and his colleagues shook the initial missile trajectory through countless arm shakes.
With the "long two bundles", there is manned spaceflight
With the advancement of missile technology, the launch of re-entry satellites was put on the agenda. Rockets that launch re-entry satellites require a larger carrying capacity and a lower speed. The task of solving the problem of rocket speed and carrying capacity fell on Yu Menglun. However, at this time, Yu Menglun was already in his 40s, and his computing tools were replaced by microcomputers, so he began to learn computer programming from scratch.
As one of the earliest computer programmers in the mainland, Yu Menglun and his colleagues gradually overcame the problems of the program in the process of exploration. After countless analyses of the optimal thrust program, Yu Menglun proposed a "small thrust ballistic scheme" that dazzled everyone.
Yu Menglun's "small thrust ballistic scheme" increases the carrying capacity of the rocket by 25%. On November 26, 1975, the Long March-2 carrier rocket carrying the mainland's first returnable satellite ignited and lifted off on time, successfully launching the satellite into the predetermined orbit, which also opened the prelude to the debut of the largest carrier rocket family on the mainland. In the "Long March-2" rocket family, the "Long March-2" bundled carrier rocket, referred to as the "Long March 2 bundle", Yu Menglun also participated in the whole process of development.
On July 16, 1990, as the mainland's first high-thrust strap-on rocket, the "Chang 2 Bundle" was successfully launched, creating a miracle in the history of world aerospace.
The taciturn hero has been rooted in the front line of aerospace for more than 60 years
Yu Menglun has studied diligently since he was a child, and his grades have always been among the best, but a serious stuttering problem has always plagued him. Because of his stuttering, Yu Menglun became taciturn and introverted when he was young, but it also made him more focused on his studies, especially like to find his happiness in the world of mathematics.
The work attitude of rushing to do and working hard has run through Yu Menglun's entire career. In 1955, 19-year-old Yu Menglun was admitted to the Department of Mathematics and Mechanics of Peking University, and after graduation, he was assigned to the First Branch of the Fifth Research Institute of the Ministry of National Defense. Since then, he has been rooted in a team for more than 60 years, and has been a "blue collar" in the grassroots position of ballistic design for a lifetime.
Many of Yu Menglun's students have become chief engineers and deputy chief engineers in the aerospace field, but he is still engaged in his original work at the age of nearly ninety. In his opinion, it is his greatest happiness to always work on the front line of scientific research and design a perfect flying arc for Chinese rockets.
In 2009, his team was named "Yu Menglun Team" by the All-China Federation of Trade Unions, which is also the first scientific research team named after an academician and is known as the first team of China's aerospace industry.
Source: Museum of Chinese Scientists
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