At 12 o'clock, the YF-87 zeroed for the second time, and the discussion on improving the route officially began.

Although Li Zheng has gone very deep in the field of data, just like the last time, he does not know what the results he gets mean, just like an artificial intelligence machine, and he does not know what the meaning of the language he feeds back represents.

In the eyes of the engineers of the 17th Institute, the crack images and data obtained from these dismantling inspections all point to a single result very clearly -

Subsynchronous precession.

In the field of astronautics, the effect of the word is equivalent to the crooning of Cthulhu......

A terrifying and unreasonable existence.

Among them, "precession" can also be called "vibration".

Speaking of vibration, this is an old friend of aerospace, equivalent to BUG to programmers, and probability to mobile game players.

During the launch of the rocket, it will encounter various vibrations, and the structure and materials have their limits and cannot withstand large vibrations.

In the design stage, of course, these complexities will be taken into account, and various vibration damping methods will be used, and Huang Er has also adopted the latest damping and variable energy accumulator for vibration suppression.

Normally, there are no problems with this design, and 8.8 is a little lucky.

But in the harshest vibration environments, the engine unexpectedly emitted a Cthulhu murmur......

This moan, which sank into the sea during the first launch, was not captured.

In the recent shafting fracture accident, covered by countless huge noises, it was equally impossible to capture.

But Liu Rui used his terrifying perseverance to capture clues in other test data.

On this basis, Li Zheng used mathematical and algorithmic tools to extract features, expanding the screening scope to all historical data in history overnight.

As he said, such a "whisper" is meaningless to take out alone, as dispensable as the wind blows leaves, but stacks countless whispers on top of each other......

He finally heard Cthulhu's voice.

It's nothing more than a sound in mathematical form.

Next, Zhu Mingyue went one step further and translated this whisper into engineering language-

In the harsh vibration environment, when the turbine rotor is running at supercritical speed, the local dynamics and material science properties produce some wonderful changes, resulting in the change of its natural vibration frequency, and then coupling resonance with the working frequency.

This means that this part has produced a "mutiny", trying to rotate and vibrate in its own way.

In this process, the turbine rotor is bound to experience enormous structural stresses.

Those cracks, which are so subtle that they are invisible, are created.

When the resonance is so intense that the structural stress exceeds the yield limit of the material, the crack will expand rapidly and then fracture in a violent rotation.

What's even more terrifying is that the subsynchronous precession is also a self-excited vibration, which will produce greater vibration because of the vibration.

It's like 100 Liu Xiang holding hands in a circle, running clockwise, according to the requirements, running a lap in 1 minute.

Because they are all Liu Xiang, this speed is nothing to them, so they run very happily.

But suddenly!

A chicken you are too beautiful came.

One of them, Liu Xiang, suddenly became an idol.

Let's start singing and dancing!

At this time, it became 99 Liu Xiang and a singing and dancing idol running in circles.

But that's not to collapse yet.

After all, Liu Xiang next to him will run with an idol, although he is tired, 99 Liu Xiang can still withstand an idol.

However, the terrifying thing is that this person who was pulled and ran was an idol.

He will not honestly spread his arms and hang in the air, being pulled by Liu Xiang in front and behind.

He is going to sing and dance.

In fact, at the same time that he became an idol, he sang the next song Chicken You Are Too Beautiful.

In an instant, the two Liu Xiang on his left and right were infected and began to sing and dance.

The singers and dancers suddenly became three, which made the runners next to them miserable.

But that's just the beginning.

More chickens you're too beautiful are already hitting wave after wave......

At 1% singer and dancer, the lap run can still be maintained, and only a few runners will have imperceptible muscle tears.

By the time the content reaches 3%, the runner can already feel the pain of pulling on the arm.

When the content reaches 5%, the pull will reach the runner's endurance limit, and either the runner will either give up or break the arm.

This is self-oscillation, which is both a cause and an effect.

And where the original "chicken you are too beautiful" came from and how to avoid it is still an engineering problem.

Just like a middle-aged man staying at home, there will always be an idol's name pasted on his face.

Since then, the logic of the accident has been completely clear.

In the conference room, Zhu Mingyue also carried out introspection and summary.

"In the first zeroing, we didn't find any small cracks, we only focused on damage to the exhaust system. ”

"From today's perspective, the exhaust system problem is not isolated at all, it is a chain reaction caused by the resonance of the turbine system, except that the exhaust system at that time was relatively fragile and broke before the turbine broke. ”

"There is no doubt that this is the direct cause of the failure of the 8.8 launch, but it is by no means the root cause. ”

"After 8.8, the first zero, we had a serious luck psychology in our analysis and treatment, and made the mistake of treating headaches and feet with pain, but unilaterally strengthened the exhaust system, which was equivalent to prescribing cough medicine to a pneumonia patient. ”

"In the end, in the 10.5 test, the tragedy of a complete fracture of the shaft system occurred. ”

"Personally, and the 17 YF-87 teams, I can't escape the blame. ”

"But although I am in the position of a sinner, I still have to thank the comrades of the First House for their hard work on the task of returning to zero. ”

"Among them, Li Zheng and Lin Yujing, two comrades, have made particularly outstanding contributions, they have twice identified the pulse through profound data analysis, and sent the pulse to my eyes, but I am personally in a hurry and failed to dig deep on this basis, and only think about making meritorious contributions as soon as possible, which led to Huang Er falling into today's predicament. I know there is no point in apologizing, but ......"

Zhu Mingyue stood up and bowed deeply to the audience.

"Leaders, comrades, I'm sorry. ”

The entire room stood up almost at the same time, not intending to accept the apology.

"Alright. Zhao Zhenhua stepped forward in person, helped Zhu Mingyue back, and waved to the audience, "Less this, sit, sit." ”

After everyone sat down, Zhao Zhenhua sighed and said:

"I'm also responsible, I'm pushing too hard. ”

In fact, when the first time it was zeroed, after the failure model was determined, Zhang Zhicheng believed that the accident was not simple, and the exhaust system had been tested and would not drop the chain for no reason. ”

His opinion is that it will take about half a month to study the causes in depth. ”

"It's me. ”

"At that time, I rejected this opinion and asked to improve the exhaust system as soon as possible and test the car as soon as possible. ”

"So, none of you should have any psychological burden. ”

"I said at the beginning, I set the route, follow me, and I will be responsible for what happens. ”

"It's the same now, this responsibility is mine, and this point must be implemented in the report, and it was not Zhu Mingyue, Zhang Zhicheng, or me Zhao Zhenhua who was in a hurry before. ”

"So everyone, don't hesitate, don't feel guilty. Zhao Zhenhua waved his arms in a flash, "Fucking fuck me, change it, if something happens again, I'll still do it!"

Zhao Zhenhua's words once again aroused the emotions of the participants, and their eyes were a little wet and red regardless of age.

The leader of a hospital, can do this level, what is there to hesitate?

Fight!

Taking advantage of this momentum, Zhu Mingyue proposed three routes.

First, hit the steel plate and reinforce the entire shaft system.

Second, redesign to bypass this problem.

Third, list all the causes that may cause resonance, and make carpet local improvements.

Obviously, Zhu Mingyue had already mentioned the first two routes before.

Even if the cause of this synchronous precession is determined, there is no clear solution internationally, and it is still a frontier in engineering design, otherwise it would not be described as Cthulhu's whisper.

It can be said that there is no 100% guaranteed solution to this problem, not even 90% of the solutions.

Therefore, even if he didn't know the cause, Zhu Mingyue had already proposed one or two paths.

As for the third way, it is full of "gambling nature" on the surface.

To this end, Zhu Mingyue used the most exquisite language to describe the root of the root -

[In the ultimate state, the local properties of the turbine rotor change. 】

Maybe a little change in the structure won't happen.

Perhaps a slight reduction in the proportion of a certain element in the shafting material would not have happened.

Maybe it's internal damping, maybe it's dry friction, maybe it's the turbine blade tip gas effect......

Now Huang Er is facing such an inspired, inconclusive situation.

In front of us is aerospace, the unknown frontier of the entire engineering.

What they can do, just like every predecessor before them-

Guess.

Try.

There's nothing like that.

Nothing is more representative of science than that.

And Zhao Zhenhua.

Whether he is a scientist or not does not know.

But it must be an old gambler.

An old gambler who has gone through ups and downs and gambled to become a leader.

There must be an element of luck in this, but it is also inseparable from the judgment of the critical moment.

In his vision, three solutions represent three ideas, three costs, and three outcomes.

First, to carry the past and thicken the steel plate, at the cost of giving up the load advantage of the hydrogen-oxygen engine, the result is that it is possible to struggle to temporarily maintain its position, but it kills the future potential of the Yellow River series.

Second, bypassing the past and designing from scratch, the cost is to postpone the hydrogen-oxygen engine technology by five years, and the result is that it is finished, but the Yellow River series may usher in a new life in a few years, in an era of more abundant technology and resources.

Three, touch the past, touch the stones to cross the river, the price is to sacrifice the last time of Huang Er's team and his last authority, the result is-

Either Caesar or nothing.

It's done, not only is Huang Er's road ahead open, but it's also a big technological leap.

To lose is nothing more than to retire in invective, ridicule and indifference.

Before today, how could an old gambling monster like Zhao Zhenhua not know that there was a third way?

It's just that the hope is too slim, this crossing the river by touching the stones, the water is so deep, where is the coincidence that you can touch the stones? More often than not, it will only sink to the bottom, and there will not even be a blister.

Even if he is an old gambler, he doesn't dare to make a rash move.

But now, he seemed to see the ripples of water and felt the outline of the stone.

In gambling jargon—

The feel is coming.

But you can't do it yet......

The more times like this, the more you have to be steady.

Zhao Zhenhua looked at Shen Tinglan: "When will the YF-100 used in the 927 enter the production stage at the earliest. ”

"Ah......" Shen Tinglan said stunned, "My position...... My identity...... This ......"

After being at a loss, Shen Tinglan finally sighed, and said in a small volume: "The earliest time of the plan is mid-December, and the variables depend on the YF-100 team, and Zhu Gong should have more news than me." ”

"Let's say December 15th. Zhao Zhenhua glanced at the rest of the people, "It's October 30th, there are still 46 days, 46 days, how far can we improve?"

No one dared to answer this question.

A few conjectures had to be put forward before they were tested, and even the first conjecture had not yet begun.

Between the seventeen people's thoughts, it was Shen Tinglan who spoke first: "Just imagine, all the improvements are focused on rotor damping and vibration reduction, replacing possible materials and structures at the same level, and finally demonstrating...... It's a lot of work, but it's better than the brainless mess that took so long. ”

Her train of thought seemed to wake up Zhu Mingyue.

"We are confident that the work that Chief Shen said will be completed within 46 days. ”

Feeling the hand, the east wind rose, Zhao Zhenhua no longer had the slightest hesitation, and slapped the table and ordered:

"Then get on!"

"Give it all to me!"

"Again. ”

"The route I set, I'm responsible for what happened!"

"Don't let go of my old face. ”

"If you dare to come up with a plan, I will dare to go to the group to shoot the chairman's table!"

"As soon as the plan came out, I guaranteed that the factory would be open. ”

"Whoever dares to block the road, I will pull a cushion to death!"

At the end of the road, the willows are bright.

Zhao Zhenhua stud, no one wants to be casual.

Of course, the people who can be in this room at this time will not be able to flinch at all.

"Up!"

"I already have an idea in my head. ”

"With the secretary's sentence, how about fighting for another year!"

"Hmm!"

Even Lin Yujing shouted with the others.

After the mood calmed down, Zhu Mingyue immediately said: "Okay, then everyone hurry up and go to the restaurant to eat something, and make work arrangements as soon as you come back." ”

After that, he turned to Zhao Zhenhua: "Secretary, you ......"

"I'm going to do something and make a noise......," Zhao Zhenhua got up, "I can't rush in and slap the table all of a sudden...... You have to think about it, and give the group leaders a preparation...... At least let them feel the breakthrough on our side and set off the mood. ”

In the laughter of everyone, Zhao Zhenhua did not forget to name Li Zheng before leaving.

"I don't know if it's a coincidence or a foresight now, but I think that Harbin Institute of Technology can do a lot of things in this process. ”

Li Zheng humbly scratched his head: "This, in fact, has a far-sighted element in it, even if I don't know the cause of the accident reported today, I know very well that this problem has touched the current technical boundary, and Harbin Institute of Technology is the farthest in China in this regard." ”

"Say you're fat, you're still gasping!" Zhao Zhenhua scolded with a smile and said to the surroundings, "Li Zheng, you have already seen it, right? The follow-up work should be cooperated and cooperated, if you don't believe him, you have to believe Harbin Institute of Technology." ”

"Of course. Zhu Mingyue hurriedly got up and sent him off, "This ...... We also need Mr. Shen to provide guidance next......"

"If she doesn't leave, I'll go. Zhao Zhenhua raised his hand and said, "But after all, Tinglan still has a job over there in 927, I pondered...... Before 12 o'clock, don't leave people overnight, it's not appropriate. ”

Shen Tinglan was stunned, looked at his watch and said, "Lao Liang told me to go back before 3 o'clock in the afternoon......"

Zhao Zhenhua confidently pressed his hand: "You heard it wrong, he heard it wrong, he asked you to go back tomorrow." ”

"That'...... Then I'll believe it. ”

A bunch of people bid farewell to Zhao Zhenhua and flocked to the restaurant along the way.

Although only the leftovers were cold, everyone ate steaming hot.

It's Chen Hongbing's rare embarrassment, he didn't have a chance to speak, and he couldn't figure out why he came.

But he is also very excited, once the new engine test is successful, Huang Er is once again on the agenda to enter the launch preparation stage, that is when he Chen Hongbing makes a comeback!

Speaking of embarrassment, though.

Chen Hongbing must not be the most embarrassing.

Jun Songtao stirred the cold rice alone, and in a trance, he felt that he was redundant.

Obviously here to turn the tide...... But it seems that Mao didn't do anything, and he did it a disservice?

Originally, there were two small subordinates, but now they are also on their own......

What should I do next, taking up the office fee air conditioner?

In the midst of self-doubt, a humble figure sat across from him, and an arrogant figure sat diagonally across from him.

"Yo. Li Zheng set up the dinner plate and said hello, "Xiao Du, do you want to come to our group?"

"Gan ......" Jun Songtao shook his head self-deprecatingly, "This is a total rout of the flow of inspiration against the flow of diligence......"

"No, it's not......" Lin Yujing sat in the farthest place from Jun Songtao, covering his forehead a little unbearably, "Diligence, but also general diligence, special diligence, and perverted diligence...... Last night, I felt like I had solved so many math problems in my lifetime......"

"Ahh Du Songtao sighed, "Xiao Lin still understands me very well...... If you don't go back to my side, don't waste your youth in Li Zheng's group. ”

"Hmm......" Lin Yujing shrank as she picked up the plate, "The spore people are open, and they would rather enter the Ru group than stick to the spore monster." ”

"Speaking of group ......" Li Zheng drank a bowl of egg soup with his head bored, and then pushed the bowl to Lin Yujing, "Xiaolin, refill a bowl of soup for me." ”

“？？？”

"Leadership. Li Zheng pointed to himself, "Make it clear, Xiaolin, I am your superior." ”

"Woo yes!" Lin Yujing squeezed his face and sprayed water wildly.

It was Liu Ruile who came over and sat beside Jun Songtao.

"It's arranged, I'm messing with you, Li Zheng. ”

Li Zheng also smiled and rubbed his hands when he heard this: "Okay, good, I saturate you." ”

"Eh, I forgot to make soup. Liu Rui picked up Li Zheng's bowl with his hand, "Are you still or?"

"Don't move, this is Lin Yujing's job!"

Lin Yujing: "Woo Woo!!"

Li Zheng: "Are you a stinging snake......

Jun Songtao: "One thing to say, I think the Spore Man is more amiable than the Stinging Snake. ”

Liu Rui: "It's still ...... I'm going to make soup......"

Liu Rui made soup, and Du Songtao also picked up the plate: "Okay, I should also go." ”

"Oh?" Li Zheng asked, "Aren't you coming to our group?"

"Don't be funny, I either look down on you, or I feel that I can't adapt to the Seventeen Institute, and it's useless to stay. Du Songtao shook his head and pursed his lips, "Besides, if Huang Er can really put it back on the agenda, maybe he can catch up with the tail of the Mars launch window in the first quarter of next year, I need to go back and make some preparations, if I lose the chain because of my blindness, I will have to wait two years next time." ”

The reason is compelling. Li Zheng put down his chopsticks and got up and stretched out his right hand, "It's not about any diligent flow of inspiration, I also have luck and inspiration in this incident, and you have also experienced that kind of hard work eight times in one night." ”

Du Songtao shook his smile and clapped his hands with Li Zheng: "Come on, you still owe me two favors, remember." ”

Li Zheng said with a smile: "If the Quest for Knowledge can really be launched next year, then it will be returned." ”

"Alright, I hope so. Du Songtao grabbed Li Zheng's hand again, "After the suffering, I hope luck will favor you." ”

"Luck only favors those who move forward tirelessly. Li Zheng wanted to let go but couldn't let go, so he had to continue beeping, "Then, see you next year when the Seeking Knowledge is launched." ”

"Hopefully, goodbye. Jun Songtao winked at Lin Yujing by the way, "18 years old is the most delicious season for apples, don't delay the good time, taste it, otherwise Li Zheng will eat Yali pear if he can't do it." ”

"Whatever. Lin Yujing waved her hand disdainfully, "Inexplicable, get up quickly." ”

Jun Songtao smiled, and really took a duck pear from his pocket and slapped it in front of Li Zheng.

"I know you're confused, but you'll thank me in the future. ”

After saying that, Du Songtao waved his hand and left, hiding his merit and fame.

"What does this mean?" asked Lin Yujing.

"Joke about it. Li Zheng waved his hand, "You still don't want to know, this person doesn't leave his old job in three sentences." ”

He said he picked up the pear and was about to eat it.

"Watch out for the spores!"

Perhaps it was some kind of instinct, Lin Yujing alertly snatched the pear and slapped it across the table.

"Ha, I made three bowls of soup. ”

Liu Rui just returned from making soup, a bowl on the left and a bowl on the right, and a bowl in the middle, which was not easy to put on the table.

"I'll give you a pear. Lin Yujing pushed the pear over without hesitation.

"Ah, I thought I was done with today's fruit. Liu Rui sat down, picked up the pear, and nibbled on it.

"My ......" Li Zheng stretched out his hand weakly.

Lin Yujing had already opened the mobile phone app with her head bored: "Can't I buy you Apple!"

Li Zheng's eyes widened.

The good fortune is coming?

What a principle?