Since Chang Haonan and Yao Mengna were both in their early twenties and in their best physical condition, and they had only flown for about an hour and a half in total, they didn't feel tired from the journey.

When they were on the road just now, the two had already discussed that they should start getting familiar with the work as soon as possible after arriving at the 601 Institute.

Of course, familiarity with work is Yao Mengna's idea.

For Chang Haonan, this kind of work of being a screw for a big project is not too familiar, so he wants to reflect the value of their research group as quickly as possible.

"Mr. Yang, I was almost resting all the way by plane just now, so our idea is that it is best to start work this afternoon."

Yao Mengna decisively rejected Yang Fenghat's suggestion to let them rest for a day.

"Hmm...... My plan is to let you know about the specific project through tomorrow's seminar, there is a big difference between doing a project in school and doing a project on our side, and you may not have any idea of the overall design of the aircraft before. ”

After Yang Fengwan finished speaking, he touched his chin and thought for a moment:

"Well, since you are so highly motivated, then after lunch, I will take you to the computer room first and get to know the other members of the digital design team first."

……

The computer room of Institute 601 is in a relatively remote building, and there are four large characters on the outer wall of the building: "Computing Center".

This is a term that will not be obsolete even after more than 20 years.

According to Yang Fenghat's introduction, this was specially prepared for digital design, which is enough to see that the institute still attaches great importance to this, but so far, the progress of the digital design team is not very optimistic.

The two walked in after Yang Fenghat.

As the chief designer of the 83 Project, Yang Fenghat's appearance naturally caused a commotion, and a few minutes later, a medium-sized, glasses-wearing engineer who looked to be in his 30s trotted all the way to the trio.

"Mr. Yang, are you ...... Why did you come here all of a sudden? ”

"Okay forester, don't be nervous, I'm not here to check your progress this time." Yang Fengwan took a step to the side as he spoke, letting go of half of his body and introducing to Chang Haonan and Yao Mengna:

"This is the leader of our 601 digital design team, engineer Lin Shikuan."

At this time, Lin Shikuan noticed that Yang Fengqi was followed by two people.

"These two experts in digital design and computational fluid dynamics that I invited from Beijing Aviation University this time, Dr. Yao Mengna and Chang Haonan...... Doctor. ”

Chang Haonan is still an undergraduate student at the moment, but his direct study for a doctorate is basically a certainty, so it is not a big problem.

"Experts don't dare to be, just call us by name, now Huaxia's aircraft design digitalization is still in its infancy, we are all students, communicate with each other and learn from each other."

Yao Mengna's words are very level.

Judging from Lin Xikuan's performance when he met Yang Fenghata just now, due to the long-term progress not meeting expectations, the morale of the entire digital design team may have some problems, and even some fears.

Especially in front of the chief model engineer, he is completely in a state of not being able to raise his head.

And Yao Mengna's answer took into account everyone's feelings very well, and did not further stimulate Lin Shikuan's already sensitive and fragile psychology.

After the three of them shook hands, they knew each other.

"Thank you Mr. Yang for still thinking about our digital team, and I am very honored to invite two experts from Beijing Airlines to help."

Lin Shikuan is really much more relaxed than when they first met.

"Then Lin Gong, you first take them to familiarize yourself with the general situation of the project, and then contact me if you have any questions or needs."

The 83 Project is currently in the stage of tackling key problems, and Yang Fenghata can be said to be in a good situation, so it is naturally impossible to stay here all the time, so after arranging two people, he turned around and left the computing center.

"Dr. Yao, Dr. Chang, please come with me."

In the following two hours, Lin Shikuan first took the two of them to visit the equipment in the computer room, and then began to introduce their work during this time.

In fact, the digital design group was established in early 1995, less than two years ago.

In other words, when their group was established, the J-8-3 01 verification aircraft had already made their first flight.

Therefore, Lin Shikuan's task in the first stage has little to do with design, mainly to transform the past paper design drawings into more intuitive geometric modeling, which is a pile of work.

However, it was a task that seemed very simple at first, and they had not completed it for almost a year and a half, let alone using digital technology to improve the aircraft.

So Lin Shikuan's meaning is also very simple, I hope to at least help them find out which step went wrong.

Chang Haonan happens to know the answer to this matter, because in the original timeline, after he graduated, he just caught up with the stage of the comprehensive transformation of the entire Huaxia aviation industry from traditional design methods to digital design, and Lin Shikuan also encountered these problems.

To put it simply, digital design is much more than just replacing a drawing tablet with a computer, but a complete set of design ideas.

But just as he was organizing the language and preparing to speak, Yao Mengna next to him took the lead.

"Actually, this question ...... I know how to fix it. ”

Chang Haonan subconsciously turned his head to look at the other party.

"When I was just doing my PhD, I tried to design some simple flying machines digitally by myself, and I encountered the same problem as you."

"This ......"

Several engineers, including Lin Shikuan, looked at each other, their eyes half surprised and half suspicious.

After all, it has plagued them for a year and a half, and the problem that the digital design team can't hold up in front of the 601 canteen aunts can solve it immediately after others hear it.

It's a bit of an exaggeration indeed

In fact, not to mention Lin Shikuan and others, even Chang Haonan felt a little surprised.

He didn't expect Yao Mengna to have experience in this area.

"Our country's aircraft shape design has been following the path of the Soviet Union, after the aerodynamic configuration design, the whole aircraft shape is mathematically modeled, and the theoretical shape is completely represented by mathematical formulas, that is, non-parametric methods."

Yao Mengna walked to a blackboard next to her in three steps and two steps, picked up chalk and wrote a few formulas on it.

"The shape design of aircraft in Europe and the United States pays attention to geometric representation, and expresses the shape curve of the whole aircraft through parametric polynomials."

She drew another Bezier curve and then wrote the cubic formula for the Bezier curve.

"Originally, these two methods actually have their own advantages and disadvantages, if the designer's mathematical skills are good enough, the mathematical formula method for the description of the shape of the aircraft is more accurate."

"But the design software you are using now is CATIA bought from France, and the design habits of the Soviet Union are applied to the European design software, and the final result will naturally be very awkward, and more importantly, there is no way to modify it through parameter tuning, which can not reflect the advantages of digital design at all."

"So you have to change your thinking habits and restore the aircraft design through the surface curve theory, so that you can get better results, which will be helpful for subsequent design improvement and even assembly and manufacturing."

After saying this, Yao Mengna threw the remaining half of the chalk in her hand into the chalk box very chicly, and then turned back.

What caught my eye was the almost identical expressions of several people.

Σ(°△°|||) ︴