Chapter 320

At 12 o'clock sharp, yf-87 returned to zero for the second time, and the seminar on improving route officially began.

Although Li Zheng has gone a long way in the field of data, just like the last time, he did not know what the results he got meant. Just like an artificial intelligence machine, he did not know what the meaning of the language he feedback represented.

In the eyes of the engineers of the 17th Research Institute, the crack images and data obtained from these machine dismantling inspections point to a unique result -

sub synchronous precession.

In space, the effect of this word is equivalent to that of kesulu

A horrible and unreasonable existence.

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

When it comes to vibration, this is an old friend of aerospace, which is equivalent to bug for programmers and probability for mobile game players.

In the process of launching, the rocket will encounter all kinds of vibration, and the structure and materials have their limits, which can not withstand the large vibration.

In the design stage, of course, these complex situations will be taken into account, and various vibration reduction measures will be used. Huang Er also adopts the latest damping and variable energy accumulator to suppress the vibration.

Under normal circumstances, there is no problem with this design, and 8.8 is a little lucky and successful.

But in the harshest vibration environment, the engine unexpectedly sends out the whisper of kesulu

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

In the recent shafting fracture accident, it was covered by numerous huge noises, which could not be captured.

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, extending the scope of screening overnight to all historical data.

As he said, it's meaningless to take out such a "low chant" sheet. It's just as dispensable as the wind blows the leaves, but it's stacked together countless times

At last he heard kesulu's voice.

It's just a mathematical sound.

Next, Zhu Mingyue further translated this chant into an engineering language -

in harsh vibration environment, when the turbine rotor runs at supercritical speed, some wonderful changes occur in the local dynamics and material properties, resulting in the change of its natural vibration frequency, and then coupled resonance with the working frequency.

This also means that this part produces "rebellion", trying to rotate and vibrate in its own way.

In this process, the turbine rotor is bound to bear huge structural stress.

Those tiny invisible cracks are created.

When the resonance intensity reaches a certain degree and the structural stress exceeds the yield limit of the material, the crack will expand rapidly, and then fracture in the violent rotation.

What's more, the subsynchronous precession is still a kind of self-excited vibration, which will produce greater vibration because of the vibration.

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

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

But suddenly!

A chicken is so beautiful.

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

Start singing and dancing!

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

But it's not going to collapse.

After all, the next Liu Xiang will pull the idol to run together, although tired, but 99 Liu Xiang still can withstand an idol.

However, the horror is, this is pulled to run, is an idol.

He will not honestly spread his arms out in the air and be pulled by Liu Xiang before and after him.

He is going to sing and dance.

In fact, as soon as he became an idol, he sang the next chicken. You are so beautiful.

In an instant, two Liu Xiang around him were infected and began to sing and dance.

All of a sudden, the singers and dancers became three, which made the runners nearby miserable.

But that's just the beginning.

More chickens, you are too beautiful, have been in wave after wave hit

When the singer content is 1%, the lap run can still be maintained, only causing a few runners to produce subtle muscle tears.

When the content reaches 3%, runners can already feel the pain of arm pulling.

When the content reaches 5%, the pulling force will reach the endurance limit of the runner, either give up or break the arm.

This is the self-excited oscillation, which is both the cause and the result.

But the original "chicken you too beautiful" from where, how to avoid, is still an engineering problem.

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

Since then, the accident logic has been completely clear.In the conference room, Zhu Mingyue also launched reflection and summary.

"In the first zeroing, we did not find local small cracks, only focused on the damage to the exhaust system."

"From the present point of view, the problem of the exhaust system is not isolated at all, it is a chain reaction caused by the resonance of the turbine system, but 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 8.8 launch failure, but it is not the root cause."

"After 8.8, after the first return to zero, we had serious fluke psychology in our analysis and treatment. We made the mistake of treating headache and treating foot pain. We only unilaterally strengthened the exhaust system, which was equivalent to prescribing cough medicine for a patient with pneumonia."

"Finally, in the 10.5 test run, it led to the tragedy of complete shaft fracture."

"I personally and the 17 yf-87 teams are to blame."

"But although I am in the position of a criminal, I still want to thank the comrades of the first people's court for their hard work in the task of returning to zero."

"Among them, Comrade Li Zheng and Lin Yujing have made outstanding contributions. Through profound data analysis, they have accurately identified the pulse twice and sent the pulse to my eyes. However, I was too anxious to achieve success and failed to dig it out deeply on this basis. I only wanted to put Huang Er into a dilemma. I know there's no point in apologizing, but... "

Zhu Mingyue got up and bowed deeply to the audience.

"Leaders and comrades, I'm sorry."

Almost at the same time, the entire conference room stood up, and did not intend to accept the apology.

"All right." Zhao Zhenhua personally stepped forward, helped Zhu Mingyue back, waved to the audience, "less on the whole point, sit, all sit."

After everyone was seated, Zhao Zhenhua sighed and said:

"I also have responsibility. I'm too pressed."

"In fact, when the fault model was determined for the first time when it returned to zero, Zhang Zhicheng thought that the accident was not simple. The exhaust system had been tested and would not fall off without cause."

"His opinion is that we should take another half month or so to study the causes in depth."

"It's me."

"At that time, it was I who denied this opinion and demanded that the exhaust system should be improved as soon as possible and the test run should be carried out as soon as possible."

"So, you should not have any psychological burden."

"I said at the beginning that I'll make the route, follow me, and I'll be responsible for anything."

"Now it is the same. This responsibility belongs to me. This should be implemented in the report. Before that, it was not Zhu Mingyue, Zhang Zhicheng or I, Zhao Zhenhua, who were eager for success."

"So you, don't hesitate, don't feel guilty." Zhao Zhenhua vibrated and waved his arm. "I'll do it for me. I'll change it. I'll do it again."

Zhao Zhenhua's words once again aroused the mood of the participants. No matter their age, their eyes were wet red.

If the head of the first hospital can achieve this level, what can be hesitated about?

Put it together!

With this momentum, Zhu Mingyue proposed three routes.

First, steel plates are made to strengthen the whole shafting.

Second, redesign to bypass this problem.

Third, list all possible causes of resonance, carpet type local improvement.

Obviously, Zhu Mingyue has mentioned two routes before.

Even if it is determined that the cause is a subsynchronous advance, there is no clear solution in the world, and it is still a frontier field in engineering design, otherwise, it will not be described by kesulu's crooning.

It can be said that in the face of this problem, there is no 100% guaranteed solution, even 90% solution.

Therefore, even if he did not know the cause, Zhu Mingyue had already proposed one or two ways.

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

For this reason, Zhu Mingyue used the most refined language to describe the root cause -

[local property change of turbine rotor under limit state. 】

maybe a little change in structure would not have happened.

Perhaps a slight reduction in the proportion of certain elements in the shafting material will not happen.

Maybe internal damping, maybe dry friction, maybe aeroelastic effect of turbine blade tip

Now Huang Er is confronted with such an inspiring and inconclusive situation.

In front of us is aerospace, the unknown territory of the whole engineering.

What they can do is just like every previous generation -

guess.

Try.

There's nothing like this to show gambling.

There's nothing more scientific than that.

And Zhao Zhenhua.

Whether he is a scientist doesn't know.

But it must be an old gambler.

An old gambling monster who has experienced ups and downs and has become a leader in gambling.There must be lucky factors in this, but it can not be separated from the judgment of the critical moment.

In his vision, three schemes represent three ideas, three costs and three results.

1、 To carry the past and thicken the steel plate, the cost is to give up the load advantage of the hydrogen oxygen engine, and the result is that he may struggle to keep his position temporarily, but it kills the future potential of the Yellow River series.

2、 Around the past, the cost of designing from scratch is to push the technology of hydrogen oxygen engine five years later, and the result is that they are finished. However, the Yellow River series may usher in new era of more abundant technology and resources in a few years.

3、 The cost of touching the past and crossing the river is to sacrifice the last time of huang'er team and his final authority, and the result is -

the success and defeat of the enemy.

It is not only a smooth road ahead of Huang Er, but also a technological leap.

If you lose, you retire in abuse, ridicule and apathy.

Before today, Zhao Zhenhua, an old gambling monster, can't know there is a third way?

Just hope too slim, this touch stone across the river, so deep water, where so skillfully let you touch the stone? More often, it will only sink, even a bubble will not have.

Even the old gambling monster, also dare not to take a hand.

But now, he seems to see the water lines, feel the outline of the stone.

In the strange gambling term, it is coming to the hand.

But we can't do it yet

The more this is, the more stable it is.

Zhao looked at Shen: "the yf-100 used in 927 will enter the production stage at the earliest time."

"Ah..." Shen heard LAN Leng and said, "my position My identity This... "

After a flurry, Shen finally sighed, saying with a small volume: "the earliest time planned is mid December, the variables depend on yf-100 team, Zhu Gong should have more news than me."

"That's assumed to be December 15." Zhao looked at the rest of the crowd, "it's October 30, there are 46 days, 46 days left. What can we improve?"

No one dares to answer this question.

To put forward a number of conjectures first, and then to carry out experiments, even the first guess has not yet begun.

Among the 17 people's hard thinking, Shen heard LAN first opened up: "imagine that all improvements focus on rotor damping and vibration reduction, and replace the possible materials and structures at the same level, and finally demonstrate It's a lot of work, but it's always stronger than the total amount of chaos that has been so long. "

Her thought seemed to wake up Zhu Mingyue.

"We are confident that we will finish these work in 46 days," said Mr Shen

From the hand, when Dongfeng starts, Zhao Zhenhua no longer hesitates. He orders to take a table and says:

then go

"Give it to me!"

"That's the same sentence."

"I set the route. I'm responsible for something!"

"I don't want to be in this old face."

"If you dare to make a plan, I dare to go to the group to take the chairman's table!"

"As soon as the plan comes out, I promise the factory will start."

"Whoever dares to stop the road, I will pull a back to death!"

The end of the road, Liu secretly flowers.

Zhao Zhenhua thorha, no one wants to be casual.

Of course, people who can be in this room at this time can no longer retreat.

"Up!"

"There's already a thought in your head."

"If you have a secretary, how about another year!"

"Well!"

Even Lin Yue Jing followed others to shout.

"I will take time to eat in the restaurant and arrange the work immediately after we come back," Zhu said immediately after his mood was calm

Then he turned to zhaozhenhua: "secretary, you......"

"I'll do something, make a voice..." Zhao Zhenhua got up at this point. "I can't rush in and shoot the table suddenly We have to make a preparation for the group leaders. No At least let them feel our breakthrough and set off their emotions. "

In the laughter of the public, Zhao Zhenhua does not forget to call Li Zheng when he leaves.

"I don't know whether it is coincidence or foresight. How can we think that Harbin Engineering University can do a lot of things in this process?"

"This is actually the element with a long-sighted perspective. Even if I don't know the cause of the accident reported today, I am very clear that this problem has reached the current technical boundary. Harbin University of technology is the farthest domestic team in this regard."

"You're still breathing when you're fat!" Zhao Zhenhua laughed and scolded, and rushed around and said, "have you seen Li Zheng? Follow up work should cooperate and cooperate. If you don't believe him, you must believe that Harbin Engineering University is not. "

"Of course." Zhu Mingyue hurriedly got up and sent, "this We need the guidance from chief engineer Shen next...... ""If she doesn't go, I'll go." Zhao Zhenhua raised his hand and said, "but listening to LAN has 927 work after all, I think Before 12 o'clock, it's not appropriate to stay overnight. "

Shen heard LAN in a daze, looked at the watch and said, "Lao Liang told me to go back before 3 p.m."

Zhao Zhenhua confidently pressed his hand: "you have heard the wrong thing, he is to let you go back tomorrow."

"Then I'll believe it. "

A group of people sent Zhao Zhenhua a good time and rushed to the restaurant.

Although only the remains of the cold, but everyone eats hot.

Chen Hongbing has few embarrassments, no chance to speak, and he can't figure out why he came.

But he was also excited. Once the new engine test was successful, Huang Er put on his schedule again to enter the launch preparation stage, which was when Chen Hongbing came back to the ground!

But when it comes to embarrassment.

Chen Hongbing must not be the most embarrassed.

Du Songtao alone stir with cold rice, trance between, feel his many more.

It is clear that it is to pull the storm But it seems that Mao didn't do it. It was a big deal?

There were two small hands, and now I am also on my own

What to do next, occupy office air conditioning?

In self doubt, a humble figure sat opposite him, and a arrogant figure sat opposite him.

"Yo." Li Zheng set up his dinner plate and said, "little Du, would you like to come to our group?"

Gan Du taunts his head, "this is a complete collapse of inspiration flow in face of hard work flow..."

"No, no..." Lin Yu sits in the farthest place from dusongtao, and some of them cover his forehead with a look back. "Diligence is also divided into general diligence, special diligence, and abnormal diligence I felt that I had solved so many math problems in my life last night

"Ah." "Xiao Lin still understands me very much," Du Songtao sighed If you don't come back to me, don't spend your youth in Lizheng group. "

"Well..." Lin Yue picked up the dinner plate and shrunk. "The sporophytes are open, rather than into the group, without spore."

"Speaking of groups..." Li Zheng sullen to drink bowl of egg soup, then pushed bowl to Lin Passover Jing, "Xiao Lin, give me a bowl of soup."

“？？？”

"Leadership." Li Zheng pointed to himself, "make sure, Xiao Lin, I am your superior."

"Bared!" Lin Yue was squeezing his face and sprinkling.

Liu Ruile, he, came to sit on dusongtao.

"I have arranged. I'm mixed with you, Lizheng."

Li Zheng also smiled and rubbed his hand: "good, saturated."

"Well, forget to make soup." Liu Ruishun picked up Lizheng's bowl in hand, "do you want it?"

"Stay still, this is Lin Passover's job!"

Lin Passover static: "bared

Lizheng: "are you a snake..."

"One thing I think is that sporozoites are more compatible than assassins," Du said

Liu Rui: "still I'll go and make soup... "

Liu Rui's Kung Fu in soup, dusongtao also brought up the dinner plate: "OK, I should go."

"Oh?" "Don't you come to our group?" asked Li Zheng

"Don't tease me. I don't look down on you, I just feel like I can't adapt to 17, and I don't have much use waiting." "And if Huang Er really gets on the agenda again, maybe I can catch up with the tail of the first quarter of next year's Mars launch window, I need to go back and prepare for it. If I just play with my chain, I'll wait another two years."

"This is a compelling reason." Li Zheng put down his chopsticks and put out his right hand. "I can't talk about the flow of inspiration from diligence. I have the same element of luck and inspiration. You have also experienced eight times a night of that effort."

Du Songtao shook his smile and patted Li Zheng: "come on, you still owe me two people, remember."

Li Zheng laughed: "if the discovery will be launched next year, then it will be returned."

"All right, I hope so." Dusongtao grabbed Lizheng's hand again. "After suffering, I hope I am lucky to be green."

"Lucky people who are only dying for the green and keep going." Li Zheng wanted to keep it on and off, so he had to keep beeping. "Then, when the discovery is launched next year, goodbye."

"I wish I could see you again." Du Songtao blinked at Lin Yue by the way. "18 is the most delicious season for apple. Don't delay the good time. Try it. Otherwise, Li Zheng will eat the pear if he is not good."

"What is it?" Lin Passover did not want to wave, "inexplicable, get up."

Du Songtao smiled, and took a pear out of his pocket and photographed it in front of Li Zheng.

"I know you are ignorant, but you will thank me in the future."

Then, dusongtao waved away, and hid his skills and fame.

"What does that mean?" Asked Lin Passover."A cold joke." Li Zheng waved his hand, "you still don't know, this person three words does not leave the old profession."

He said that he would eat the pear.

"Watch out for spores!"

Maybe it was some instinct. Lin yuejing grabbed the pear and photographed it across the table.

"Ha, I made three bowls of soup."

Liu Rui has just returned from the soup. He has a bowl on the left and a bowl on the right. It's not easy to put it on the table.

"A pear for you." Lin qiojing pushed the pear forward without hesitation.

"Ah, I thought I had finished my fruit today." Liu Rui sat down, picked up the pear and began to gnaw.

"Mine..." Li Zheng couldn't reach out.

Lin Qijing has closed his head to open the mobile phone application: "I can't buy you an apple yet!"

Li Zheng's eyes glared.

Fortune is coming?

What's the principle.

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