However, the surprise in Fang Zhen's eyes only lasted for a moment.

"Brother, if you want to redesign the wing, it will definitely affect the whole body, the overall structural characteristics of the aircraft will be changed, and it may also involve a higher level of materials and manufacturing technology, both in terms of cost and ability......"

Fang Zhen's concerns are actually justified.

Because the product does not grow on its own from the shelf.

No matter how amazing Chang Haonan's ability is, things in the engineering field must be implemented in production and manufacturing after all.

But this field is not something that can be promoted by one or two geniuses with a flash of inspiration.

Even if you have prepared raw materials, machinery and a full set of technical documentation, it is not an overnight task to train workers who can adapt to new equipment and new technologies.

And the wing design scheme in their hands has basically touched the current ceiling in this regard.

But this time, before Han Feng could explain, Du Yishan opened his mouth first.

"I think that according to the calculations written by Xiao Chang, it should be considered to use active suppression methods without modifying the wing design?"

Although he has long passed the golden age of research, Du Yishan is experienced and well-informed, so he can see far more from those dozen or so scratch papers than two doctors.

"Yes, Mr. Du is right." Chang Haonan nodded and continued:

"We can use the model predictive control (MPC) theory to deal with the constraint control system through rolling optimization and feedback correction to achieve active suppression of flutter."

"That's why you need to consider the influence of the flaperon and do aeroservoelastic modeling?" Yao Mengna's eyes lit up.

She was just thinking about why Chang Haonan did this.

I thought it was just the other party's obsessive-compulsive disorder of striving for perfection, but I didn't expect that there was a greater use hidden behind it.

Thinking of this, Yao Mengna sighed lightly in her heart.

At the beginning, she still felt a little unwilling to admit defeat to Chang Haonan in her heart.

But now......

Recognize the reality.

Chang Haonan nodded: "Of course, but this time there is no need to re-simulate, just apply an MPC control signal to the wingtip acceleration curve just calculated, and the specific control rate I have written into the program before." ”

He had already said this, how could the two doctors not understand, Fang Zhen hurriedly came to the computer again and began to process the data.

The next ten minutes were as long as ten hours.

"After applying MPC control to the wing, the flutter critical speed was increased to ...... 175m/s。 ”

There was some tremor in Fang Zhen's voice.

"That's no problem, 175m/s, equivalent to 630km/h, the safety margin is almost a quarter."

Chang Haonan's mentality at this time was very stable: "So our passenger plane can use this new wing design!" ”

However, this time it was Yao Mengna who was worried.

After hesitating for a few seconds, she spoke in a voice that only four people could hear:

"But teacher, Senior Brother Chang, this is a brand-new engineering model after all, and Professor Hawkint is a foreign expert hired by the Hojing 603 Institute, so the result is so bad at once, do you think that it can really be used there?"

It's strange to say that Yao Mengna is usually not afraid of the sky when she does scientific research, but this time she is a little worried.

"Foreign experts?"

At this time, Du Yishan also recovered from the excitement at the beginning:

"Hmph, what's wrong with the foreign expert? Could it be that what he said in the English must be right? ”

As he spoke, he stretched out two fingers and tapped on the table next to him: "Since the 603 Institute handed over this project to us, it means that they at least have this idea and this courage." ”

"Then our subject is ...... Basically closed? ”

Fang Zhen next to him couldn't even believe what was happening.

You know, just a day ago, he and Yao Mengna were still struggling with the idea of nonlinear simulation.

A day later, the problem was solved lightly by a new undergraduate student who joined the group.

By the way, the problem of the wing flutter critical speed being too low was also solved.

"You have to take your time to finish the topic, at least the final report needs to be polished."

Du Yishan looked at the piece of paper in front of Fang Zhen with the calculation results written on it and said:

"I will personally go to Hojing tomorrow and explain the situation to Comrade Zhou Yonghang and Comrade Yi Yuanhe, this is not just a wing, and it is not just a matter of passenger aircraft project."

Zhou Yonghang is now the director of the Hojing 603 Institute, and Yi Yuanhe is the chief engineer.

Chang Haonan next to him didn't speak, but he was overjoyed in his heart.

As an academician, although Du Yishan no longer holds a front-line position, his influence is still there.

If he comes forward, there is still a high probability that the 603 Institute will choose to believe in this result and conduct a series of subsequent flight tests.

And once the test shows that there is no problem with this method, Chang Haonan, as its creator, will definitely be noticed, and at least can participate in the follow-up project of the MA60.

Compared with his earliest plan to start with Professor Liu Hongbo and then slowly get in touch with the MA 60 project, the progress has been many times faster.

"But it's Xiao Chang." Du Yishan dragged a chair and sat next to Chang Haonan: "This model of yours involves our specific model design, and it has a wide range of applications, and it will play a great role in the entire aircraft design, especially in the field of passenger aircraft design, so ...... I'm afraid it's not suitable for public publication anytime soon. ”

Chang Haonan was stunned.

"What do you mean ......"

Obviously, since Du Yishan had already said that he wanted to go to Hojing in person just now, he must not be ready to hold this achievement.

So the only possibility......

"Let the 603 Institute do the verification first, and if it can be determined to be feasible, it will become the internal design material of our national aviation system."

Du Yishan took off his glasses, wiped them with the corners of his clothes, and put them back on:

"It's just this kind of internal material, and there are very few people who can see it."

"It's okay, Mr. Du." Chang Haonan smiled and replied in an indifferent tone: "I told you before that I think the value of our Huaxia Airlines people is not reflected through papers. ”

With the system to relive his life, how could he be satisfied with winning a little fame in the academic circle.

Finding ways to get in touch with higher-grade projects as soon as possible, get more resources, and help Huaxia Aviation Industry and even the overall industrial development to get on the fast track is the top priority.

The thesis is only a means, not an end to him!

The improved design of the J-7 before is said to be a second-generation and a half-level improvement, and it is only a course design assignment, so it is necessary to use the influence of the journal to let others see it.

The significance and importance of the engineering model he has developed today is completely different.

It can fully rely on the ongoing New Boat 60 project and be promoted internally as an "advanced experience".

That's a lot more than a paper.

You know, this kind of engineering model that can be widely used, even in large companies like Boeing, Loma, and Rolls-Royce, is definitely not a secret that will not be casually disclosed to the public.

As for the Huaxia Aviation Industry, which is not so thick, it has to keep this few unique skills.

Hearing Chang Haonan's categorical answer, Yao Mengna looked at him with a hint of understanding in her eyes.

Fang Zhen next to him lowered his head, revealing a thoughtful expression.

As for Du Yishan, he just patted Chang Haonan on the shoulder and nodded slightly.

Of course, he could see that his student was not hypocritical when he spoke, and this was not the first time that the other party had made a similar statement.

In 1993, Jinling University was the first to put forward a mandatory requirement for doctoral graduates to submit SCI papers, and other schools quickly followed suit.

By 1996, a culture of materialism had gradually begun to form.

Of course, from the point of view of ensuring the quality of postgraduate training, this cannot be said to be a bad thing.

But it is inevitable that engineering disciplines such as aircraft design, which are not so easy to produce papers, will be affected.

In this context, it is even more rare for Chang Haonan to have this kind of awareness.

Satisfied, Du Yishan suddenly had a bold idea-

It may be possible to get such capable and determined students to participate in some projects in advance.

It can also be regarded as injecting some rare fresh blood into the Huaxia aviation industry.

However, before that, we still have to let the 603 Institute verify the correctness of Chang Haonan's model.

Otherwise, I am afraid that the convincing power will not be enough.

Thinking of this, he took out a bunch of keys from his pocket and handed them to Summer next to him:

"Xiao Xia, you go to my office and get a few floppy disks, copy the engineering files in the computer, I will use them tomorrow."

There is no trivial matter in engineering, even if he is already an academician, he must come up with enough real evidence to reassure the 603 Institute.

Summer was fast-moving, and it didn't take me a few minutes to come back with a floppy disk case, then sit down in front of the computer and start copying data.

Although the capacity of a floppy disk is only 1.44 or 2.88 MB, it has a lower read and write speed, usually ten to twenty KB/s, and it is also unstable.

Therefore, it can even take a few minutes to fill a plate.

Taking advantage of this, Du Yishan walked to the side and looked at the calendar hanging on the wall:

"When I come back from Hojing, let's have a group meeting in the afternoon the day after tomorrow, and everyone will prepare a little in the next two days."

Then he turned his head to Chang Haonan and said alone:

"In addition, Xiaochang, computer-aided design and simulation should be the future development direction of our field, in these aspects, my age is not as receptive to new things as you young people, so I want you to systematically talk to you about this knowledge."

As soon as Du Yishan finished speaking, before Chang Haonan could react, Yao Mengna picked up:

"Mr. Du is right, I have always had this idea before, Chang Shidi has a very high level in computer simulation, sometimes a few words of guidance can make people open their minds, if you tell us a special time, everyone's progress will definitely be greater."

Although after this day's work, everyone in the laboratory already knows-

Chang Haonan, very powerful.

But only Yao Mengna has really consulted Chang Haonan and knows how powerful he is.

Being able to tell a thing by oneself and being able to say it are two different things.

Being able to speak out and being able to explain it in simple terms are two different things.

If you want to reach the third realm, the level is not only superb, but at least you must be able to integrate it.

And the two times Chang Haonan told her, although her attitude and tone always made her grit her teeth in anger, the effect was indeed very good.

In addition, Yao Mengna also wanted the rest of the research group to experience the feeling of being crushed by IQ when receiving Chang Haonan's guidance.

Share the blessings and the difficulties.

"Hmm...... No problem. Chang Haonan rubbed his nose and replied: "The effect may not be very good, I can find an example to demonstrate it on the spot." ”

Teaching more people what he would have known or systematically taught, and exerting his collective power was originally a strategy he had set since he was reborn.

Now that Du Yishan took the initiative to propose it, it was naturally impossible for him to refuse.

"In that case......"

Du Yishan lowered his head and pondered for a moment, and soon thought of a feasible solution:

"It's not good for so many people to get together in the computer room, I'll go find a laptop, and then the other people will report normally first, and then you will take a break after they are over, and then you will come and give a presentation to everyone."

At the same time that the content of the group meeting was finalized, the summer side finally completed the copy of the materials.

So Du Yishan put away the floppy disk box and prepared to leave the office.

But at this time, Fang Zhen suddenly stopped him from behind:

"Teacher Du, we were supposed to go out for dinner in the evening to welcome the junior brothers who had just joined the group, but now it seems that the welcome banquet is going to become a celebration banquet, do you want to come together?"

Chang Haonan next to him was also stunned, no one had told him that there was this before.

It was supposed to be a surprise for him.

It's just that today he brought a bigger surprise to everyone in the research group.

"Forget it, I won't join in the fun, without me as an old man, you young people will have a ...... fun"

Du Yishan didn't reply halfway through his speech, and suddenly realized something:

"Oh, that's what you mean by asking me for reimbursement, right?"

Fang Zhen and Yao Mengna nodded together.

"Then you keep the invoice at that time, and when the group meeting is finished, if everyone's progress is good this semester, I will reimburse you in full."

In these aspects, Du Yishan is basically not stingy, and even when he was young a few years ago, he would organize the autumn outing activities of the research group every year.

"Oh-"

"Thank you, Mr. Du!"

"Long live Mr. Du!"

"Goodbye Mr. Du, we won't send it!"

“……”

While everyone was coaxing, Chang Haonan checked the changes in the system.

For himself, there is nothing new in today's output, so the two competency values of theory and management have not changed, only the engineering experience has increased by another 10 points.

But for this era, he today has created a completely new and influential engineering model.

Therefore, although it has not yet been verified and implemented, the number of scientific research points has directly increased by as much as 20 points.

So the current situation of the system becomes:

[Research points: 26.]

Theoretical level: LV2 (0/10000)

Engineering Experience: LV1 (70/1000)

Management capability: LV0 (5/100)

Comprehensive ability: LV1

Projects in progress: 0

Possible Projects:1】