Chapter 375 The eagle flying out of the mountains

After calming down a little, Rui Xiaoting followed Chang Haonan's suggestion and divided the entire model into three parts, selected method 2 and hit the enter key.

"call……"

Looking at the program running log flashing across the screen, he breathed a sigh of relief and leaned back in his chair.

Everything that happened this morning went much smoother than expected.

It even makes people feel a slight sense of unreality.

Just in time, the sunshine approaching noon shone in from the window and reflected on the faces of several people.

Rui Xiaoting looked up at the wall clock on the wall next to him——

According to his experience, most of the computers in the school computer room display the UNIX TIME epoch time, which is January 1970, 1.

It’s a quarter past ten in the morning, just before dinner time.

"Director Chang, do you want to go out for a meal together?"

He asked Chang Haonan next to him:

"You have been so helpful this time. You must give me a chance to express my gratitude. When I came from the airport, I saw a good restaurant on the road. I came to treat you."

Originally, Rui Xiaoting applied to the school for a mid-term business trip of 10-15 days before coming to the capital, and he specifically informed the finance department that it might be extended further, but judging from the current efficiency, it may not even be used for 10 days. Come on.

"Are you going to eat... don't be in a hurry, let's get down to business first, and it won't be too late to go there later when we can run the full gun firing dynamics simulation."

"Of course we have to do business, but if we are idle now, we will be idle. No matter how hard we get the grid..."

At this point, Rui Xiaoting's voice stopped abruptly.

He noticed that the estimate of the number of grids had been completed on the screen and the calculation of the coarse grid had begun.

According to his experience, this preparation process alone often takes one to two hours or even longer.

And this has just passed...

five minutes?

If estimated according to the scale, it may take 30-40 minutes to complete the entire gridding process.

It’s really not enough to go out for a meal.

But Rui Xiaoting is different now than before.

He evolved.

Rui Xiaoting made up his mind that he could no longer be surprised by trivial matters.

Otherwise, it would look like Grandma Liu entering the Grand View Garden.

He himself didn't care, the main thing was that he couldn't embarrass the school.

Chang Haonan had already achieved his goal of Amway and did not continue to speak.

However, in this tacit silence, there was a voice that seemed extremely harsh:

"Teacher Rui, how come the grid is progressing so fast?"

The graduate student who had been in a state of confusion just now finally came to a part that he could fully understand.

Then he sighed almost subconsciously.

"..."

For a moment, Rui Xiaoting regretted that in order not to delay the progress of the project, he did not bring over the most stable old doctor in the research team.

Half an hour later, almost the same as the time Rui Xiaoting had just estimated, the program gave a prompt that "grid formation has been completed."

"Then... you can directly simulate the entire car, right?"

To be on the safe side, he made an additional confirmation.

"That's right, and I just deduced the multi-body... multi-body system discrete-time transfer matrix method that you imported. It should be used for natural frequency analysis of linear time-varying control systems. It just so happens that my software supports forced continuity Iterative function, so you can even directly simulate the overall situation when the entire vehicle fires continuously, without having to calculate each shot individually.”

Multi-barrel rockets are used as continuous-fire weapons. During the launch process, the contact stiffness between the ground and the tires as well as the mass and distribution of the pitching body change with the change of the number of rockets on the cradle. In particular, the mass of rockets is relatively large, and the mass and distribution of rocket launchers have changed significantly compared with empty loads and full loads. The impact of mass changes on the dynamic response of multiple launch rockets must be considered.

In addition, for a weapon system under the elastic support theory, when the next round is fired, the vibration caused by the previous round has not completely stopped, which is equivalent to adding a new vibration to the original vibration characteristics. Characteristics, the further back the projectile sequence is, the greater the impact will be. Therefore, there will be a slight difference in the time interval between each two launches of the rocket launcher. There are also strict regulations on the launch sequence, which is not based on the directional tube. Arrange in order.

In order to ensure the accuracy of the simulation results, it is often necessary to manually determine and calibrate the results after the calculation of a launch is completed, and then iterate into the next launch.

Chang Haonan solved this pain point.

But for Rui Xiaoting, his first concern is another place:

"Director Chang, I wonder when you deduced this result...?"

Just kidding, the three of them spent the whole morning together.

"Just now, when I was waiting for the grid to be formed, it took half an hour, which was enough to think about something."

"But why can't I figure it out..."

The graduate student next to me blurted out, but the second half of the sentence was choked back by the knife-like gaze of his instructor.

Rui Xiaoting said to himself that not only can you not figure it out, but I can’t figure it out without relying on a computer. Don’t embarrass our school...

It wasn't until the simulation process officially started that he gradually came back to his senses.

For long-range rocket launchers, due to the limited number of directional tubes, the advantage of fully automatic iterative calculation is actually not great. At most, there is no need to send someone to watch in front of the computer.

However, as the cradle of almost all artillery systems in the country, Jinling University of Science and Technology undertakes far more research and development projects than this.

Among other things, the small-caliber rapid-fire anti-aircraft gun currently under development has a rate of fire of up to 1100 rounds per minute. If we manually iterate one by one, even typing out sparks on the keyboard will be almost meaningless.

As for the multi-barreled close-in defense guns that the Navy urgently needs...

cough cough.

Thinking of this, Rui Xiaoting took out his notebook from his pocket, tore out a page from it, and quickly wrote down his office phone number and address:

"Chang Gong, I'll leave you a contact information. When the trial version comes out, be sure to notify me as soon as possible."

He made up his mind that he couldn't just embarrass himself here, but he also had to let others experience the feeling of a broken Taoist heart when he returned.

Chang Haonan took it, folded it and stuffed it into his wallet:

"No problem. I guarantee that your school will be one of the first trial customers. If necessary, I can also provide a video tutorial CD."

"Thank you very much."

Rui Xiaoting still looked calm on the surface:

"In addition, I think that after we get the trial version, we can hold a series of special lectures for various colleges and universities in Jinling, which should have a good promotion effect."

……

At the same time, in Yunma Factory, AS City, Guizhou Province.

Sun Huizhong was checking the information for the last time before departure on the laptop in front of him.

Behind him, parked was a full-size wooden model that had just been completed.

Although other brother units have increasingly begun to increase the proportion of digital work in the design and even manufacturing processes, for Guihang, which has relatively limited conditions, many tasks still have to be completed using old methods.

For example, they currently only have limited aerodynamic computing capabilities, so if they want to test the installation of various equipment inside the aircraft, they still have to build a wooden prototype.

The aeronautical engineers who have joined their factory in recent years have basically improved rapidly in their woodworking skills, not to mention their ability to design aircraft.

Of course, it was not without its benefits. The furniture produced by Yunma Factory helped them get through the most difficult period from the late 80s to the early 90s.

Compared with the J-7 originally produced by Guizhou Airlines, this aircraft is much more advanced in terms of appearance.

At least it's no longer a nose intake.

Thanks to the valuable nose space being freed up, the cockpit space has also been greatly released, especially the forward view of the rear seat trainer, which was so good that the pilots responsible for test-flying the JJ-7 in the factory praised it repeatedly.

At this time, another person panted and ran to Sun Huizhong, took out two brown paper envelopes from his arms and handed them to him:

"The thick one is your travel expenses, and the thin one is the photo of the model."

Lin Haijun, general manager of Guizhou Airlines.

Although his name contains the word "Navy", he has never seen the sea in his life. After graduating from Bingcheng Engineering University in his early years, just as the third-line construction was in full swing, he was assigned to the mountains of Guizhou Province.

"So thick? You can't use so much money, right?"

As he spoke, Sun Huizhong opened a crack and took a look, only to find that there were a lot of change of 10 yuan or even 5 yuan inside.

It feels very thick, but actually it doesn’t cost much.

"The factory has paid out everyone's basic living allowance this month, and we really can't spend much money on the account."

The visitor wiped the sweat from running on his forehead and looked a little embarrassed:

"Fortunately, the county is quite supportive of us and gave us some money. It's just a little too much change..."

Sun Huizhong's face darkened after hearing this answer.

His trip was almost responsible for the life and death of the entire group.

If Guihang collapses, the cadres like them may be assigned to other places, and the worst they can do is be on the bench. But the workers in the factory, as well as the many industries surrounding Guihang in several surrounding counties and towns, are obviously It's all bad and bad.

The economy of Guizhou Province is not very developed to begin with, so I am afraid it cannot withstand such hardships.

Lin Haijun looked at the aircraft design drawings on the computer screen in front of Sun Huizhong, and felt that something was missing.

If this model is successfully approved, it should be named Coach 9 according to the naming rules.

But in the design stage of the manufacturer, it usually has its own internal code name.

The current one is FTC2000.

It means "a combat training aircraft produced by China and geared towards the 2000s."

Future export models will also be called this.

But this cold numerical number still seems to make little sense.

"Let me tell you, Old Sun, the design we come up with should have a nicer name, right?"

"Um……"

Sun Huizhong put down the mouse, lowered his head and walked back and forth a few times.

"This plane took off from our mountain, let's call it 'Mountain Eagle'."