Super military empire

"Sure enough, a hero from ancient times!" Hearing Liu Yijiu's introduction, the old technical staff who stopped their work applauded.

"Don't worry, we all know these theories. Anyone knows how to play tricks. Get some practicality. Xiao Liu, if you can come up with a more in line with the power design, I won't have a problem even if I worship you as a teacher! "Qin Yuan didn't say unnaturally.

He entered the base later, and Liu Su knows that his knowledge is relatively comprehensive. He has heard of it, but has never been in touch.As a young Liu Yijiu, even if he started to learn these aspects from his mother's womb, it would be impossible to think about everything involved and be proficient.

"Change the current four tail fins to four front and rear, and the front four fins are about one-third of the way to rectify the air resistance on the front of the rocket body and the airflow for the first time; the rear tail is still four. , At forty-five degrees from the front or arranged on the same axis..." Liu Yijiu put forward some of the design structures of rockets that he will use in later generations.

Although he does not know whether this structure is reliable, it is designed in this way in various countries, and it is certainly not a problematic design. In terms of aerodynamics, it is obviously much better than the four-piece tail with a larger wingspan.

Hearing Liu Yijiu's introduction, Qin Yuan directly began to draw sketches on the blank drawings on the table. Although it was only a minor design modification, the design involved the design of the entire system.

Need to go through large-scale verification calculations.

"This is not something that can be verified in a short time..." Wang Shunyi obviously knows this too. He is the chief designer of the entire project and knows all aspects.

Liu Yijiu has been studying with Du Bin from the University of Aeronautics and Astronautics for a long time, and Wang Shunyi also knows.Although Du Bin is not well-known in China, he is still quite successful in aerodynamics, but he has not been given the opportunity to show his talents after returning from studying abroad.

Du Bin returned to China to contribute to the national military industry because he was invited by Liu Suzhi. In the end, he had not participated in the project design and the country was in turmoil.The superiors randomly assigned him to the University of Aeronautics and Astronautics.

"In order to make these special-shaped structural parts more aerodynamics, finite element analysis must be done. Only through the calculation of infinite finite element approximation can more accurate data be obtained..." Liu Yijiu gave the finite element analysis to It's brought up.

In the national defense military industry system, finite element analysis is a must.

When computers were popular, there were professional graphics processing software to carry out such calculations, but at this time, this calculation can only be done manually.

But the amount of calculation is a bit big...

Liu Yijiu knows the general idea, but he doesn't know how to do it. The old technicians in front of him are all masters in this area. As long as they bring it up, they will naturally find a way to solve this problem.

"What is finite element analysis?" Everyone was a little confused.

This is the first time they have heard this statement.

The concept of finite element has been produced and applied several centuries ago. For example, a polygon (a finite number of linear elements) is used to approximate a circle to find the circumference of a circle.

It was proposed as a method after the large-scale use of computers in the 1980s.Wang Shunyi and others are not ignorant of finite element, it should be said that they do not know how to use it in this respect.

"This is a newly proposed method for calculating the strength of aerospace structures. It is just a theory and has not been applied on a large scale. Although it is very simple to use, it has to go through a lot of complicated calculations to get it. Higher calculation accuracy..." Liu Yijiu's answer made the crowd listen to him explaining what finite element analysis is, and how to use it in rocket design, they can't wait to choke him.

The typical selling point is not!

"Comrade Xiao Liu, this time is not the time to sell Guanzi, time is precious..." Wang Shunyi said with a gloomy expression.

"Okay. Finite element analysis is the use of mathematical approximations to simulate the real physical system (geometry and load conditions). It also uses simple and interacting elements, namely elements, to use a limited number of unknowns. A real system approaching an infinite unknown quantity..." Liu Yijiu explained the finite element analysis theory he knew.

He is very skilled at using this, but it is operated by the brain, not by his own artificial calculation.

Not to mention, even the design of an airplane wing is an extremely large calculation project.

Airplane wings, in the eyes of those who don’t know how to do it, are flat gadgets, but they are indeed drawn by a closed curve (it is constructed with countless identical curves, just like countless The points formed by the wing form a straight line, and the whole airplane wing is regarded as a straight line, and the point forming the straight line is the closed curve.

On this curve, the more points are taken, the closer the final curve is to the designed curve.

In terms of design, there is no problem, but in the process of processing, the more precise the points are taken, the more aerodynamics the wings will be, which makes the aircraft have better flight performance...

Liu Yijiu’s other people don’t know. I heard that the curve on the wings of the first three-generation semi-fighter J-10 independently developed by the Republic took a total of 80,000 points during the wind tunnel experiment. The designer is inputting these. In the process of modeling, there can be no mistakes at all!

"Don't say it so profound, for example!" Wang Shunyi was a little dizzy by Liu Yijiu's slurred professional terms.

They all have high IQs, and they all have good results in mathematics. After all, mathematics is a basic science of science and engineering.

But they have left school for decades.

"The simplest example is to use a polygon to approximate a circle to find the circumference of a circle. Replace complicated problems with simple ones. We need to use polygons to find the circumference of a circle. A polygon with more natural sides will finally find The more accurate the result is..." Liu Yijiu said helplessly.

Let him give an example, and he can only cite such a simple one.

"Say it early! It turned out to be like this..." Hearing Liu Yijiu's example, everyone suddenly realized.

Whether it is researching rocket launchers, rockets or missiles, or even fighter jets, this method is really useful.

A straight line can be used to approximate the curve infinitely, so that the most precise calculation result can be obtained.

At the same time, in the process of processing, such processing is much more reliable than relying on the technical experience of the workers.At least, the processing quality can be guaranteed in this regard!

"I only saw this thing in a certain paper at first, and I didn't pay much attention to it. Now I want to find more detailed information. I guess it won't work. I can only rely on the teachers to explore it by themselves..." Liu When Yijiu saw these old men staring at him with bright eyes, he suddenly felt bad.

"I have something to do, so I'm leaving now..."

"Comrade Xiao Liu, don't go, let us introduce finite element analysis..." An old man wearing glasses grabbed Liu Yijiu.

The curiosity of these old technicians is very strong.

The Republic is supported by their generation!

"Teachers and uncles, that's all I know..." Liu Yijiu was very uncomfortable at the dissatisfied look of these old men.

I knew it shouldn't be like this.

Obviously pretending to be too much...

"Okay, let's explore these things by ourselves. Xiao Liu has learned a lot of things outside these years, we can take it slowly..." Wang Shunyi also knew that Liu Yijiu loved like ordinary young people. Show off, if you know more, you will definitely spit it out.

The more shocked these old guys are, the higher his sense of accomplishment.

"Farewell, I've been patronizing fun outside the past few years, and I haven't learned anything..." Liu Yijiu took advantage of this opportunity, waved his hand and strayed outside...

Just kidding, he is really entangled by these people, he has to be sliced ​​and studied?

"Master, what's wrong with you?" Liu Yijiu walked into the design room out of breath, looking out from time to time.

Can you tell me something like this?

There used to be a saying called "Don't install b, pretend to be struck by lightning!"

Now there is no lightning strike Liu Yijiu, but there are a bunch of crazy old technicians who want to crush him...

The theory tells them it's okay. The crux of the problem is that these old technicians are all of the kind who are very curious about knowledge. They won't stop until they figure it out. How can Liu Yijiu figure it out?

This is an era without intellectual brains, and even computers are still in their infancy.

When thinking of computers, Liu Yijiu felt that he had made a mistake at the beginning.

A worker must first sharpen his tools if he wants to do his best. Without the aid of a computer, he spends his time constantly doing some basic calculations and drawing pictures all day long!

This is an extremely wasteful thing.

What's more, the American emperor has just started in this area in this era. He can completely save the Republic from taking a century of detours and occupy the commanding heights of technology from the beginning!

"Hurry up with paper and pen!" Liu Yijiu did not answer Yang Shan's question, but shouted at him.

He wants to make a microcomputer!