Chapter 293 Chang's Model
When Chang Haonan walked out of Tang Lintian's office, Chang Haonan still felt a little unreal.
In his previous life, he worked from school to research institute, but he had never experienced this kind of efficiency in doing things. From entering the door to greeting to making the request and finally getting the agreement, it took less than 10 minutes in total.
The tea was still warm even when we left.
Standing in the corridor of the aircraft building, Chang Haonan was a little confused about what he should do in the afternoon.
Before talking to Tang Lintian about the database, he had been thinking about buying a mobile phone and applying for a number.
Two of the three major operators that everyone will be familiar with do not yet exist at this time - China Mobile will not be established until 1999, and China Unicom will not be established until 2000.
At this time in 1997, only China Telecom provided commercial mobile phone services. This company was independent from the General Administration of Posts and Telecommunications in 1994. It has only been three years since then. It still has a strong official institutional atmosphere, such as Don't work on weekends.
So this matter can only be done tomorrow.
The computer room was still being renovated, so there was nothing that he needed to deal with.
After thinking for a moment, Chang Haonan remembered that just before he left, Tang Lintian asked insinuatingly about the progress of compiling the textbook...
In the end, he decided to go find Liu Hongbo.
According to the impression from his previous life, this teacher almost never had a day off before he got married.
As expected, it only took more than ten minutes, and after continuously searching several places where the other party often appeared, Chang Haonan found Liu Hongbo in the student office.
"Good afternoon, Teacher Liu."
Although the two of them always addressed themselves as seniors and juniors when they met, this was after all in front of other people's students. Chang Haonan thought about it and decided that there was no need to put on the airs of this senior uncle.
Besides, in fact, the title Teacher
"Junior brother?"
Liu Hongbo himself didn't care about this. When he saw that the person coming was Chang Haonan, he was also surprised:
"You came back at the right time this time. Well, I just have a lot of questions to ask you.”
"About the teaching materials?"
Chang Haonan wanted to know why the other party was so troubled.
Speaking of it, he did not do it properly. The original plan was to come back and help compile the textbooks after finishing his work in Haojing. However, there was a project suddenly coming up in the 14th Institute. In the end, Liu Hongbo had to work alone for two months.
“Yes, I almost finished the first five chapters according to the outline and ideas you gave me, that is, from the introduction to the linear analysis in solid mechanics and structural mechanics, but starting from the sixth chapter, junior brother Ah...Are you really sure you want to put the content of nonlinear finite elements in? I tried to show it to first-year graduate students, but no one could understand it..."
Liu Hongbo He handed a piece of information in his hand to the student, and then took Chang Haonan back to his office.
It should be said that this efficiency is quite good, because the latter's outline has a total of twelve chapters, of which the last chapter is a program example. You can just copy and paste it, leaving eleven chapters.
In terms of length alone, nearly half of it has been completed in two months.
Of course, if you consider the difficulty of compilation, it may only be about a quarter...
On the desk, the computer screen is showing a pile of densely packed and continuously winding tubes. .
Chang Haonan remembers that this thing seems to be called a three-dimensional pipe. It was a screen saver that many people liked to use back then. Due to its mechanical problems, CRT monitors, if the screen remains motionless for a long time, the electron beam will bombard the same position of the phosphor layer for a long time, causing the screen to accelerate aging. Various screen savers are designed to avoid this happening.
But for Chang Haonan, this is indeed a long time ago.
Only some brands of OLED screens in later generations will experience a similar "screen burn" phenomenon, and screensavers have gradually become a historical term, although Juhardware still retains it in Windows 11.
Of course Liu Hongbo didn't know that Chang Haonan was thinking about so many things during the few seconds he stared at the screen. He shook the mouse twice to end the screensaver and then entered the password.
The content displayed on the screen was replaced by a Word document.
But this page only has a title.
"General Methods of Nonlinear Analysis"
The following is a blank.
“I have rewritten this part for the third time. No matter what ideas I use, the feedback I get is basically the same, I just can’t understand it.”
A look on his face The distressed Liu Hongbo pulled Chang Haonan in front of his chair and asked the latter to sit on it. Then he moved a stool to the corner and sat next to it:
"I think we can consider directly starting to solve the following equilibrium equations, skipping the nonlinear analysis part?"
"In addition, there is also the following part, heat transfer, field and incompressibility Finite element analysis of fluid flow problems, I think this chapter has nothing to do with the theme of our textbook. These aspects are rarely used in the aircraft design process. "
"Also..."
< br>Obviously, Liu Hongbo was very careful in the process of writing this textbook.
Otherwise, he would just pile up all kinds of theories and give some examples and be done with it. He would not encounter these troubles at all, let alone make any suggestions.
However, these designs of Chang Haonan are naturally well thought out, and many of them are pitfalls that he and his colleagues have stepped on before.
"How can it work? The three prerequisites of linear analysis are to analyze the displacement of the object. Infinitely small, the material has linear elastic properties and the boundary conditions remain unchanged throughout the process, but for most problems, especially those involving large deformations, this assumption simply does not hold. ”
Chang Haonan. He immediately shook his head. He would never give up the corresponding request because of the difficulty.
Because life is not a game, there is no story mode difficulty option. If you don’t teach it in school, you can only learn it at work.
But at that time, it was not as simple as passing a subject.
"Not to mention, when I did the wing flutter analysis for the MA-60 last year, I used a combination of nonlinear finite elements and nonlinear beam models. If you haven't even learned the basic theory, how can you solve the practical problem? When you ask questions, you will definitely suffer a big loss.”
“But we must also consider the acceptance of the students.”
Liu Hongbo tugged at his thick hair:
"The model you proposed is now called Chang's model in our industry. That is to say, the original results were suppressed by the teacher and were not published publicly. Otherwise, you might be able to become a fellow of the American Society of Civil Engineers... …You can’t expect all students to be at the same standard as you.”
“I don’t have that kind of thing...”
Chang Haonan waved his hands and was about to say that he was not interested, but suddenly he noticed a question:
"Wait, why is it the Association of Civil Engineers?"
(End of this chapter)
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