The Military-industrial Scientific Research System of the Academic Master Chapter 30

Chapter 30: Solve the problem in one day!

After almost a whole morning passed, Chang Haonan finally put down the pen in his hand.

On the draft paper next to it, the mathematical theory and analysis process for nonlinear flutter analysis of the wing are densely listed, as well as the aerodynamic servoelastic modeling method that takes into account aerodynamic control force.

Next, you only need to spend some time modifying the flutter analysis module of MSC.NASTRAN to start simulation calculations.

At this time, the door of the laboratory was pushed open again, and a tall figure wearing a dress appeared at the door.

“I just brought you lunch when I came back from the computer room. Come here to get it!”

It's Yao Mengna's voice.

“Thank you Yao Bo!”

“Long live Yao Bo!”

Everyone else in the office rushed to the door as fast as possible, leaving only Fang Zhen and Chang Haonan still there.

“Yao Bo, a new person came to our laboratory today. Didn't you bring him food?” Fang Zhen said with a sly smile on his face.

“Newcomer? I don't know, who is it?”

Yao Mengna squeezed through the crowd with difficulty and placed a lunch box on Fang Zhen's table.

“I'm your senior.”

Fang Zhen ignored the lunch box on the table and pointed at Chang Haonan who just raised his head.

“Senior?” Yao Mengna looked in the direction pointed by the chopsticks in Fang Zhen's hand with a confused look on her face.

Chang Haonan also looked at the two doctors on the other side of the office blankly - he had heard the term "senior" from Fang Zhen the night he first met him, but because he was busy doing experiments, he quickly understood it. Forgot about it.

“How…how…how is it?”

Yao Mengna's cheeks turned pink almost at a speed visible to the naked eye.

At this time, other people who had received their own portions of lunch boxes also returned to their seats, and soon noticed Yao Mengna's strange expression.

“Why does Senior Sister Yao look at Junior Brother like this?” Xia Tian picked up a piece of green pepper from the lunch box and stuffed it into his mouth, asking curiously.

Chang Haonan curled his lips.

It's just a junior brother, what the **** is a junior brother...

"Maybe...maybe it's because I met the senior I haven't seen for a long time..." Fang Zhen was laughing so much that he almost fell on the table.

“Ah? Isn't this the junior who will be a senior in college next semester?”

Several other people in the office had gossipy eyes twinkling.

The first person to react was Xia Tian. After all, she had dinner with Yao Mengna and Fang Zhen that day.

“Oh, he's the one…”

Xia Tian covered her mouth with one hand and didn't even notice that the potato slices she had just picked up fell off.

That very effective simulation idea was actually told to Yao Mengna by this junior fellow who was only in his junior year!

“Junior sister Xia Tian, what's going on?”

Everyone's eyes turned to Xia Tian.

"summer!"

Yao Mengna raised her eyebrows and clenched her fist fiercely into the air in front of her.

Xia Tian, who was about to explain, shrank his head and immediately retreated.

However, as the senior brother, Fang Zhen was "not afraid of power" after all and told the whole story.

By the time he finished speaking, Yao Mengna had already leaned back on her desk to pretend to be an ostrich, not raising her head no matter how she screamed.

The society is dead. In short, I regret it very much.

Very regretful.

It was just a casual comment at the time.

Who would have thought that he would become a junior fellow student in the same laboratory...

When she thought about having to be classmates with her for at least three years in the future, Yao Mengna felt that the whole world had become gloomy.

"Don't be like this, don't be like this." Chang Haonan really didn't expect that Yao Mengna would give herself such a title: "I shouldn't be that old."

After saying this, I couldn't hold back my laughter.

“I ate a lot for breakfast, and I'm not hungry yet. Junior brother, just eat my share.”

Fang Zhen, who had finally laughed enough, stood up and placed the unopened lunch box on his table in front of Chang Haonan.

This also allowed him to see the dozen or so pieces of draft paper scattered on Chang Haonan's table. .

“Huh?” Fang Zhen's expression suddenly became serious:

“This is...Lagrangian-Green strain, and...Kirchhoff stress tensor...Are you trying to rewrite the dynamic equations of the wing structure under nonlinear conditions?"

“Senior brother is awesome, you can tell at a glance.” Chang Haonan put down the pencil in his hand, and then gathered the spread out draft paper.

Fang Zhen was a little smug when he heard this compliment, but then he immediately realized it - if he understood it, he was very powerful, so wouldn't Chang Haonan himself, who derived the equation, be even more awesome?

Who is this sentence praising?

“Ahem—let's not talk about this for now, where are you going?”

“Forget it.” Chang Haonan arranged the draft paper and put it aside, and then opened the lunch box on the table, with the same expression on his face.

The short answer and the flat tone seem to be talking about a trivial matter.

But Fang Zhen knew what this junior brother was doing in the morning, so after hearing these three words, his whole body was immediately excited.

“Is it over?” Fang Zhen reached out to the pieces of draft paper with almost trembling hands: “Can I take a look?”

“Just take a look.” Chang Haonan was concentrating on cooking and replied without raising his head.

About twenty minutes later, Fang Zhen was still standing there like a sculpture, but his expression had changed from the relaxed and carefree expression at the beginning to a frown.

Not only does the mathematical knowledge involved in the later content become more profound, but more importantly...

Chang Haonan must have entered the state, so when it came to the last few pages, the handwriting on it was really a little bit dramatic.

“Senior Brother Fang Zhen, what are you looking at so seriously?”

At this time, everyone had finished eating and was about to enter lunch break, but Fang Zhen standing behind Chang Haonan looked extremely eye-catching.

“Our junior has derived the generalized aeroelastic equation under nonlinear flutter conditions...”

Although there were two pages of content that he didn't quite understand, Fang Zhen still understood the final conclusion.

Chang Haonan was eating his rice when he heard Fang Zhen's words, but he still took the time to add:

“Not just that, but also the aeroservoelastic system state space equation that takes into account the wing control surface, so that the effect of the flaperons can be taken into account in the wing modeling.”

Those two sentences made the entire laboratory fall into a dead silence.

Even Yao Mengna, who had been pretending to be an ostrich just now, raised her head, and even the flush on her face faded a lot.

They certainly know what the generalized aeroelastic equation means.

As long as this equation is solved and then processed very simply, the critical speed of the nonlinear flutter of the wing can be obtained.

As for the equation Chang Haonan mentioned later, not many people care about it.

It's not that everyone doesn't understand, but at this time, active flutter suppression is not yet an obvious science, so introducing movable control surfaces into wing modeling seems to be a thankless task.

But actually, that was the focus of his work this morning!

Thanks to the book friend [Lost Pigeon] for the 2000 starting coin reward

(End of this chapter)

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