Siheyuan: I eat melons while doing scientific research

Chapter 1217 Ready-made! (4k, 5k more)

Gao Zhendong then remembered the incident, which happened two years ago when the 17th Ministry of Machine Building set up the stage for the blast furnace operating line and the Ministry of Foreign Trade had a role in it.

It seems that the Ministry of Foreign Trade has tasted the sweetness. In order to avoid conflict with the trade fair in Guangzhou, it simply defines this event as a high-tech product trade fair. At the same time, taking into account that high-tech products have a research cycle, the event is scheduled to be held every two years.

Gao Zhendong thought it was a good idea. Compared with ordinary products that needed to be exhibited and sold in places with developed sea transportation such as Yangcheng, high-tech products had to be highlighted in Beijing. Especially in the 60s, either Songjiang or Beijing were the best choices.

"Oh, is there anything I can help you with?" Gao Zhendong has some status in the Ministry of Foreign Trade. He cannot do anything that harms their interests, but it is not a big problem to help them.

Lou Shouxing shook his head: "No, I was just visiting the exhibition."

"Visiting the exhibition... So, do you want to participate? Participate as an overseas high-tech enterprise. I just don't know if it's too late?" Gao Zhendong had no idea about this exhibition and didn't know when it would start.

However, for Zhenxing Electronics Group, it is beneficial to participate in the exhibition as an overseas high-tech enterprise, which can open up markets that it never dared to think of before. Not all products of Zhenxing Electronics Group are represented in China, so if it can participate in the exhibition, it is still a promising thing.

Lou Shouxing's eyes lit up: "Hey, this is a good idea, Zhendong, can it really work? It's still early, it will happen after the New Year."

Is it still early? That's easier to say.

Gao Zhendong nodded: "It should be no problem. I'll ask later." Apart from anything else, based on the young comrade he brought back and the cooperation that Zhenxing Electronics had done before, the country would not put up any obstacles to this matter.

Seeing two grown men just standing there and deciding such a big thing in just a few words, with one of them even having a little girl riding on his neck, Lou Xiao'e was laughing. As for He Wu, he probably had some experience of Gao Zhendong's situation from his last visit, so apart from being a little surprised, he was fine.

Seeing the two of them talking about serious matters, she also remembered that in theory she had serious work to "report".

"By the way, Zhendong, I just happened to report to you about the charity fund." Maybe because she had been with Lou Shouxing for a long time, her way of speaking had a bit of a mainland accent, and she also followed Lou Shouxing in calling him "Zhendong", and they immediately became a family.

Gao Zhendong and Lou Xiao'e looked at each other, and Gao Zhendong smiled and said, "Don't tell me about this. I don't really understand it. Just talk to Xiao'e when you have time."

He himself is too lazy to care, but he can't just let it go. He still has to show his attitude to some extent. At this time, moving his wife out is the best choice.

Lou Xiao'e waved her hands quickly: "No, no, I don't understand these things. I'm still busy with my work at school."

He Wu knew when to advance and when to retreat. She didn't say much about Gao Zhendong's decision to give up, but since Lou Xiao'e also gave up, she didn't go along with Lou Xiao'e's wishes.

She grabbed Lou Xiao'e's hand and said with a smile, "It's okay, it's very simple. You are a college student, so there will be no problem. I can understand it even though I am a high school student. Just think of it as a story."

He Wu had long known that this sister-in-law was not difficult to get along with, which made her feel at ease. Moreover, the operation of this charity fund must be explained clearly to this sister-in-law's family.

Seeing Gao Zhendong's encouraging eyes, Lou Xiao'e nodded: "Okay, let's talk when we are free later."

"That's right, we'll talk about it later." He Wu was very happy about this.
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"Leader, Comrade Zhendong called and wants to request a booth at our exhibition."

In the Ministry of Foreign Trade, a comrade reported to the leader.

When he received Gao Zhendong's call, he was also confused. He had no experience in this kind of thing. Although he knew that the leader was unlikely to refuse, and this matter should have been within his own scope of work, he still did not make a decision on his own and reported the matter to the leader.

Some favors are only valuable if given by leaders.

The leader of the Ministry of Foreign Trade was stunned: "Is he going to sell arms at the exhibition?" The materials were sold by the 17th Ministry of Machine Building and had little to do with Gao Zhendong himself.

After thinking about it, this idea was really outrageous, and the leader himself laughed.

"No, he said there is a company in Hong Kong Island that wants to participate in the exhibition."

After listening to the comrade's report, the leaders of the Ministry of Foreign Trade immediately understood what was going on. They had dealt with Zhenxing Electronics more than once or twice and knew it must be this.

"Oh, I see." The leader did not comment and asked the comrade to go back and do his own work first.

As soon as the reporting comrade left, the leader picked up the phone and called Gao Zhendong.

"Zhendong, you said that regarding the matter of Zhenxing Electric, you can ask them to come to me themselves, or you can just call me directly and I will naturally make the arrangements." This is quite interesting.

Gao Zhendong was stunned: "Ah, I thought it was a small matter, so I didn't bother you."

"It's a small matter for me, but it's not necessary for you. Remember, if you need to communicate with foreign investors in the future, just come to me directly." The leader of the Foreign Trade Department smiled, and then added: "The matter you mentioned is no problem. As long as Zhenxing Electric is willing, it will also be a good thing for us. You can ask them to come to my communicator and we will handle it. You don't have to show up yourself."

Gao Zhendong was confused, but as long as the job was done, it would be fine, so he agreed repeatedly.

After hanging up the phone, Gao Zhendong turned to look at the comrades in front of him: "Comrades, let's talk about the last simulation calculation method in the design process of anechoic tiles - the finite element method."

Sitting in front of him were Engineer Hong and his team, who had spent the past few days digesting the knowledge related to sound-absorbing tiles.

After trying hard for several days to digest the content related to sound-absorbing tiles taught by Professor Gao Zhendong last time, they came to Gao Zhendong with their overall gains and questions during the digestion process.

When the leaders of the Foreign Trade Department called, Gao Zhendong had just answered their questions. In the past few days, not only Engineer Hong and his team were trying to digest the information, but Gao Zhendong himself was also working hard to answer their questions.

After most of the doubts were solved, Gao Zhendong's next task was to solve the last one, which was also the most complicated, most technically demanding, and relatively the best one.

The technical requirements here are high, not just mathematical knowledge, but also the technology of calculation tools. This thing is very troublesome for humans to calculate.

Gao Zhendong's words left Hong Gong and the others confused.

"Finite element? What kind of technology is this?" The prototype of finite element was proposed very early, but it was not until 1960 that it could be truly applied. In addition to the constraints of the development of mathematics itself, another important reason was the computer.

Before computers matured, it was possible to use humans to perform finite element analysis, but it was somewhat impossible to use humans to perform finite element analysis.

"To put it simply, the object to be solved is regarded as many small blocks called finite elements. These small blocks are interconnected and affect each other. Ultimately, finite and simplified finite elements are used to solve the simulation problem of a real physical system. This technology has only officially emerged in recent years. You may not know it yet, but it doesn't matter. Let's use the calculation of anechoic tiles as an example to study the application of finite elements in the simulation calculation of anechoic tiles. As for the finite element system, we will talk about it later."

It is like the neural network was proposed very early, but deep learning began to rise and become known to the general public after the 21s. Before that, except for researchers who specialized in studying neural networks themselves, other application technicians had relatively limited understanding of neural networks.

Gao Zhendong's process is like solving a quadratic equation by directly solving a specific equation without studying the formula for solving the quadratic equation.

Solve specific problems first, then consider systemic approaches.

Comrades, there is nothing much to say. We must follow Gao Zhendong's pace on this matter.

Taking non-resonant composite gradient anechoic tiles as an example, Gao Zhendong explained to his comrades the application of finite element analysis in this problem from beginning to end in a very systematic manner. Only then did the comrades understand why Gao Zhendong did not talk about the finite element analysis method itself at the beginning.

If we start with the theory of this method, it would be a bit abstract. Without this example, it would be difficult to understand it directly.

Not to mention abstract concepts, even the specific topic that Gao Zhendong mentioned, which already has practical experience, sounded a bit confusing to the comrades.

"Do you understand?"

"I understand a little bit, it's too mathematical..."

"Yes, it's really difficult. Just understanding simple concepts requires a lot of brainpower."

"But you know what, after this division and simplification using the finite element method, we can now simulate the stress and changes of the entire material that we were unable to calculate and simulate before..."

"I always feel that this method is not as simple as just this aspect."

"Matrix calculations, and continuous calculations, are difficult to calculate with humans..."

"Yes, but judging by the characteristics of this method, it seems much easier to calculate it on a computer."

"But matrix calculations require a lot of programming, and we are still a little weak in software in this area. The support for this in the C standard library is very weak."

"Then we can write our own function library in C language to support it. As long as the method itself is useful, then it will be worth our hard work."

"..."

During the break, many comrades were communicating with each other in the toilet. This thing is indeed not easy to do.

Although it is not easy, comrades can see that this method is really effective. The only problem now is to learn it.

Back to Gao Zhendong, before Gao Zhendong started to speak, Engineer Hong asked a question that the comrades were more concerned about: "Chief Engineer Gao, this method is not just used for the simulation of our anechoic tiles, right?"

Gao Zhendong laughed and said, "Yes, this is a basic mathematical method that can be applied in many directions, such as structural calculation, and even in... I won't say what it is, but some comrades have already started using it in structural design."

Comrades who are working on aircraft have already started using it, but they just don’t want to say it out loud.

It didn't matter whether he said it or not, it was like a flash of lightning passing through Hong Gong's head.

"Chief Engineer Gao, does that mean this can be used in the structural design of underwater pressure-resistant components?"

If the pressure-resistant components of a submarine have a regular shape, then they are relatively easier to calculate during the design. However, there are too many things to consider and take into account for submarines, and their shapes are often not so regular. Before this, the only way to design them is to combine some less accurate theoretical calculations with experiments.

Now that we have this method, at least in terms of theoretical calculations, the effectiveness of the results has been greatly improved, reducing the cost and requirements of the experiment, and can even solve some problems that previous methods could not achieve better results and could only be solved by brute force or pure material piling.

"Chief Engineer Gao, can I teach this method to other comrades when I go back?" Engineer Hong asked.

Gao Zhendong was stunned, then laughed: "This is just a mathematical method. You don't need to ask for my opinion. It is essentially no different from the Pythagorean theorem. Moreover, this method is also being studied abroad and is open to the public."

It doesn't seem to be very public, at least we didn't see it, but it's impossible for Hong Gong to say this out loud, he just thought about it in his heart.

Anyway, achieving the goal is the most important thing.

Gao Zhendong continued to explain to his comrades the application of finite element analysis in the design of sound-absorbing tiles.

"…In summary, we can obtain a set of finite element analysis models to simulate the sound absorption performance of anechoic tiles. Through calculation, we can obtain a frequency-sound absorption graph. From this graph, we can draw the following conclusions: This non-resonant composite gradient structure has good sound absorption performance, and in most of the mid- and low-frequency ranges, its sound absorption performance does not change much, and has good broadband performance."

Looking at the graph that Gao Zhendong took out, the comrades were very excited. They were not only excited because they had learned a new method and a new theory. The key was that the frequency-sound absorption graph that Gao Zhendong took out contained more than just the two data of frequency and sound absorption coefficient.

This picture also shows the specific data of this non-resonant composite gradient structure, including the diameter of the speaker, the diameter of the capillary, the length of the speaker section, and the length of the capillary section, all clearly shown.

This means that even if they simply copy this existing structure, they can still produce a good sound-absorbing tile.

Theory and stuff can be put aside for now, Chief Engineer Gao directly calculated all the results! This suddenly lightened the burden on the shoulders of the comrades who were under time pressure.

If there are no better structural parameters, the one given by Chief Engineer Gao in this drawing can be used, it’s ready-made!

(End of this chapter)