When he 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, and he never experienced this kind of efficiency, from entering the door to greeting and finally making a request and finally obtaining consent, it did not take more than 10 minutes in total.

Even when leaving, the tea was still warm.

Standing in the corridor of the aircraft building, Chang Haonan was a little entangled in 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 another number.

Later, two of the three major operators that everyone was familiar with did not exist at this time - China Mobile was established in 1999, and China Unicom was not established until 2000.

In 1997, only telecommunications provided commercial mobile phone business, this company was only independent from the State Administration of Posts and Telecommunications in 94 years, and it has only been three years now, and it still has a strong official temperament, such as not working on weekends.

So this can only be done tomorrow.

And because the computer room is still being renovated, there is actually nothing he needs to deal with.

After thinking for a moment, Chang Haonan remembered that just before he left, Tang Lintian asked about the progress of the compilation of the textbook......

In the end, he decided to go to Liu Hongbo.

According to the impression of his previous life, this teacher almost didn't have a day off before he got married.

Sure enough, it only took ten minutes, and after searching several places where the other party often appeared, Chang Haonan found Liu Hongbo in the student office.

"Teacher Liu, good afternoon."

Although the two of them usually meet as senior brothers and younger brothers, this is in front of other people's students after all, Chang Haonan thought about it and decided that there was no need to put this uncle on the shelf.

In fact, the title of Teacher X is not limited to students when facing teachers, and professors sometimes use similar ways to address each other.

"Senior brother?"

Liu Hongbo didn't care about this, and he was also surprised when he saw that the person who came was Chang Haonan:

"It's just too good for you to come back this time, I just have a lot of questions for you."

"About textbooks?"

Chang Haonan also wanted to know why the other party was so distressed.

Speaking of which, it is true that he is not very authentic, the original plan was to come back to help compile the teaching materials together after the busy work on the Haojing side, but there was a project on the 14th side of the institute, and in the end he had to let Liu Hongbo do it himself for two months.

"Yes, I almost came up with the first five chapters according to the outline and ideas you gave me, that is, from the introduction to the linear analysis of solid mechanics and structural mechanics, but from the sixth chapter onwards, junior brother...... Are you really sure you want to put the nonlinear finite element content in, I tried to show it to the first-year graduate students, and no one could understand it......"

Liu Hongbo handed over a document he was holding to the student, and then took Chang Haonan back to his office.

It should be said that this efficiency is already quite good, because the outline of the latter has a total of twelve chapters, of which the last chapter is a program example, and when the time comes, you can just copy and paste, so that there are eleven chapters left.

In terms of length alone, nearly half of the work has been completed in two months.

Of course, if you take into account the difficulty of codification, it may be about a quarter......

On the desk, the computer screen is showing a dense pile of tubes that are constantly winding and stretching.

Chang Haonan remembers that this thing seems to be called a three-dimensional pipeline, which is a very popular use by many people back then...... Screensaver.

Because of the mechanism of CRT display, if the screen is kept still for a long time, the electron beam will bombard the same position of the phosphor layer for a long time, resulting in accelerated screen aging, and various screen savers are designed to avoid this situation.

It's just that for Chang Haonan, this is indeed a long memory.

Only a few brands of OLED screens will have a similar "burn-in" phenomenon in later generations, and screensavers have gradually become a historical term, although giant hard companies still retain it in Windows 11.

Of course, Liu Hongbo didn't know that Chang Haonan had thought so many things in the few seconds he stared at the screen, so he directly shook the mouse twice to end the screensaver, and then entered the password.

The content displayed on the screen is replaced with a Word document.

But there's only one title on this page.

General Methods of Nonlinear Analysis

There's a blank space underneath.

"I've rewritten this part for the third time, and no matter what way of thinking I use, the feedback I've gotten is basically the same, I just can't understand it."

Liu Hongbo, who looked distressed, pulled Chang Haonan to his chair and let the latter sit on it, and then went to the corner and moved a stool to sit next to him:

"I think we can consider starting to solve the equilibrium equation directly and skipping this part of nonlinear analysis?"

"In addition, there is the following section, finite element analysis of heat transfer, field, and incompressible fluid flow problems, which I don't think has anything to do with the topic of our textbook, and these aspects are almost not used in the aircraft design process."

"And ......"

Obviously, in the process of compiling this textbook, Liu Hongbo was quite attentive.

Otherwise, he only needs to pile up all kinds of theories in one go, and then get some examples at random, and he will not encounter these troubles at all, let alone make any suggestions.

However, Chang Haonan's designs are naturally well thought out, and many of the contents are the pits that he and his colleagues have stepped on.

"The three assumptions of linear analysis are that the displacement of the object to be analyzed is infinitely small, the linear elasticity of the material, and the boundary conditions remain constant throughout the process, but for most problems, especially those involving large deformations, this assumption simply does not hold."

Chang Haonan immediately shook his head, he would definitely not give up the corresponding requirements because of the difficulty.

Because life is not a game, there is no difficulty option for the story mode, and if you don't teach it in school, you can only learn it at work.

At that time, it was not as simple as hanging a subject.

"Not to mention, when I did the wing flutter analysis for the MA60 last year, I used the combination of nonlinear finite element and nonlinear beam model, if I haven't even learned the basic theory, I will definitely suffer a big loss when solving practical problems."

"But you also have to take into account the level of acceptance of the students."

Liu Hongbo pulled his still thick hair:

"The model you proposed is now directly called the Chang's model in our industry, that is, the original results were not published by the teacher, otherwise you estimate that you can mix with a fellow of the American Society of Civil Engineers...... You can't expect all students to be the same standard as you. ”

"I didn't ...... that thing"

Chang Haonan waved his hand and just wanted to say that he was not interested, but in an instant, he paid attention to a problem:

"Wait, why the Society of Civil Engineers?"

(End of chapter)