The military-industrial scientific research system of the academic master.

What was somewhat beyond Chang Haonan's expectation was that besides Guihang, who was completely caught by chance, there were others who were also moving equally fast.

Just three days after the three-department joint meeting, he received a very polite application letter in his office at Beijing Airlines.

Sent via military line.

The letters came from Jinling University of Science and Technology and the General Armament Department, which had just been established a few months ago.

The final signed sender was Rui Xiaoting.

In fact, he can be considered a mistake.

Because the content is to invite Chang Haonan to provide theoretical and numerical calculation consultation on a "multi-body system emission dynamics problem".

It’s still the kind that pays consulting fees.

There was no direct mention of the new software Chang Haonan was writing.

However, judging from the feedback from the other party on paper, it should involve the joint application of the transfer matrix method and the finite element method of discrete time in a controlled system.

Although the transfer matrix method is not directly included in the database, Chang Haonan considered when designing the software that some unpopular directions may have some calculation methods that are not universal, so several custom interfaces were specially set aside. .

As long as users have the corresponding algorithm design and programming capabilities, they can add their own simulation methods to the software.

And it can be used in conjunction with existing variable discretization or variable separation methods in the software.

So this is exactly what his current research direction can address.

It is even more suitable than the advanced trainer aircraft from Guizhou Airlines.

After all, the latter is actually no challenge to Chang Haonan. Even without the new software at hand, he can still rely on old methods and experience to solve it.

As for the specific projects behind the other party's question...

Although the launch dynamics of the multi-body system is a rather unclear statement, considering the nature of Jinling University of Science and Technology and the rise of another general equipment department, the result is actually not difficult to guess.

Generally speaking, these two things are inseparable from rockets or missiles.

So after a moment of thinking, he decided to let the other party come over first so that he could understand the situation in person.

Mainly because the work he was doing was progressing so quickly with the help of Xu Yang and other key figures at the computing institute, to the point where he had to stop and wait for others.

……

As a colleague in the military industry, the other party also showed a considerable degree of vigor and resoluteness.

Two days after the reply was sent, Professor Rui Xiaoting brought a person who looked like a student to the supercomputing center of Beijing Hang University.

After meeting, this time, Chang Haonan was a little surprised.

Judging from the content of the initial application letter, the sender should be the person in charge of an entire equipment type, not a specific model.

Generally speaking, those who can secure this position must be a big boss with sufficient qualifications and level.

But the person in front of me looks quite young, in his thirties or forties at most.

Excluding Chang Haonan himself, who is a cheater, he can definitely be regarded as a young talent.

Rui Xiaoting had actually done his homework before writing the application letter. Although he still suffered some psychological shock when he saw the real person, he was mentally prepared after all.

"Hello Director Chang, thank you very much for accepting our application."

"After I saw your letter, Professor Rui, I was looking forward to meeting you soon, but I didn't expect you to move so quickly."

The two shook hands tightly, said a few polite words for just meeting, and then sat down on the two sofas in the reception room of the supercomputing center.

"Oh, there's nothing I can do about it. Time is tight and the tasks are heavy. Party A is urging me urgently, otherwise I wouldn't come here on a Saturday afternoon to disturb your rest."

Rui Xiaoting said, taking out a laptop from the bag behind him and placing it on the table. After turning it on, he turned the screen towards Chang Haonan:

"Let me make a long story short first and introduce the specific content of our topic. There are some things that are not convenient to write down in writing."

"I'm guessing, maybe a multiple rocket launcher?"

Chang Haonan looked at the Windows system that was reading the article and expressed his previous guess.

Computers in this era are more user-friendly and give users ample time to communicate.

This made Rui Xiaoting express a little surprise for the first time:

"Yes, it seems that Director Chang is also involved in the field of multi-body dynamics?"

"That's right. From a numerical calculation point of view, it has some similarities with the problems I studied before. Of course, if you really want to talk about it, it is definitely not as good as experts in the field like you."

Chang Haonan, who confirmed his guess, was not prepared to steal the show today. He just wanted to verify the efficiency of his software when facing real problems.

"It's good if you understand. It saves me the most troublesome part."

Rui Xiaoting sighed softly when he said this:

"When many people hear that we are researching artillery equipment, they feel that the technical content is not high. As a result, we receive very little funding and our scientific research is not prioritized at the top."

"To be honest, before I sent the application letter this time, I didn't expect to receive a response soon. But the next day, I received a call from the General Armament Department, asking us to fly to the capital to meet you immediately."

Chang Haonan, who has been engaged in aviation for his whole life, has never had such an experience. He really didn't feel the same way, so he had to change the direction of the topic slightly:

"Bazookas are different from ordinary artillery equipment. The technology is very difficult, especially for long-range rocket launchers. The design difficulty is probably no lower than that of ordinary tactical missiles."

Perhaps long-range rocket launchers are somewhat similar to tactical ballistic missiles in terms of appearance and military use, but from an engineering perspective, they are two completely different pieces of equipment, and their performance optimization orientations are also very different.

Hearing that Chang Haonan had such a view, Rui Xiaoting immediately became more energetic, and even felt as if Boya had finally met Ziqi:

"Yes, yes, the long-range rocket has a high trajectory and even has to enter a section of the stratosphere. In addition, the projectile itself has to spin to maintain stability. The flight dynamics equation is extremely complicated, because continuous launch must also be taken into consideration. Due to the transient conditions of the launch tube and the interference between multiple rockets, the problem is much more complex than laymen imagine."

When the two of them talked to this point, the computer finally started booting up.

"I wonder if Director Chang has ever heard of our country's 'Guardian' series of rocket launchers?"

"The one that was successfully exported to Turkey last year?"

Chang Haonan in this timeline actually had no contact with relevant information, but he had seen many reports in this regard before his rebirth.

"Yes, it was only after we proved that our products have the potential to earn foreign exchange through exports that we received more attention. Otherwise, we might not even have the opportunity to send you a letter to apply."

Rui Xiaoting gestured to the graduate student who came with him next to him.

The latter immediately took out a piece of paper material from the bag behind him and handed it to Chang Haonan.

It appears to be a technical manual.

"Before coming, Xiao Li originally said that he might need to introduce the nature of our products in detail, so he brought something like this as a souvenir for you."

What a technical manual.

It's a pity that Chang Haonan doesn't have a real guy at hand for practical operation.

"The topic we are studying now is to comprehensively upgrade the previous basic model, which is the Guardian 1, to create a long-range missile that is more advanced in performance and can even be used as a substitute for ballistic missiles for some small and medium-sized countries. Rocket launcher!”