The Military-industrial Scientific Research System of the Academic Master Chapter 543

There are four solutions to this problem in Chapter 543 (4K large chapter)

Shocked as a shock, Chang Haonan quickly realized that being able to ask for his opinion on such an important personnel appointment was definitely a sign of the organization's high level of trust in him.

Although Ding Gaoheng said that he planned to let Lan Xinzhi take charge of the Equipment Industry Department, the leaders of the second-level bureaus of ministries and commissions generally do not belong to the central management sequence.

But this is not an ordinary job transfer after all, but a candidate for a new department leadership position spawned in a round of large-scale organizational adjustments.

And this new department is also the focus of many parties' confrontation.

It is definitely not something that the director of the Science and Technology Commission can make casually.

Including coming to Zhiqiu to ask his opinion on the candidates, I am afraid that is not the case, or at least it is not just what Ding Gaoheng meant.

“Okay, I will come up with the results before the conference.”

Chang Haonan replied seriously.

After finalizing the matter involving organizational appointment, Ding Gaoheng's expression relaxed a lot.

After all, the matter of organizational adjustment and reform does mean walking on thin ice.

Ding Gaoheng resumed his relaxed sitting posture, but did not move to other topics:

“When do you plan to complete this die forging press and put it into production?”

Chang Haonan's name does not appear directly.

To be honest, National Day gifts are both formalistic and morale-boosting.

Now that I have said it, I don't have so many worries.

To put it bluntly, his promotion of the aviation industry in the past two years has exceeded that of the previous two decades.

In this context, if a heavy-duty die forging press, a powerful and important machine with few units in the world, can really be put into production, it will definitely be regarded as a first-class model.

Of course, on the other hand, Chang Haonan's multi-faceted reliability and age-beyond maturity have been proven many times by himself in the past two years.

“If resources are sufficient, our first priority plan is to strive to put the equipment into production before October 1999, which can also be regarded as a gift to the 50th anniversary of the National Day.”

However, the instructions from superiors were relatively vague, and they only mentioned that “pay attention to soliciting the opinions of some core technical personnel in the appointment of key positions.”

Always using past achievements as bargaining chips seems a bit unconvincing.

After all, this also affects the amount of resources that the die forging press can obtain after entering the production process.

However, in the dark stage before dawn in 1999, it is obviously more inclined to the latter.

For example, the aviation industrial park that has been confirmed to be located in Luzhou has taken up a lot of this year's funding.

Ding Gaoheng, who barely suppressed the shock in his heart and remained calm on the surface, gave up drinking water, put the cup back on the table, and calmly wiped the water stains that had just spilled on his shirt:

At this point, perhaps because he was worried about putting too much pressure on Chang Haonan, he changed the subject again:

“However, this time point is a bit exaggerated. I won't talk about it for the time being, so don't put too much pressure on your side. Ensuring the smoothness of the project and the reliability of the equipment are the top priority.”

Of course, those forces that want to hinder China's industrial development cannot just give up.

“Xiao Chang, please be clear with me.”

Not to mention the economic benefits it brings by the way.

Ding Gaoheng's hand shook as he just picked up the thermos cup.

It can be said to be far-sighted.

The manufacturing industry is a typical high-investment, long-cycle industry, and it is impossible to see money back within one or two years.

In the last life, during the National Day military parade in 1999, not only did the missiles that had just been tested and not yet finalized be brought out to support the scene, but the imported S300 anti-aircraft missiles were even given the name of Red Flag 15, pretending to look like No. 11 Engineering got the production line that way.

That's why Ding Gaoheng was a little confused before he spoke.

In this era, China really needs confidence.

At one time, it really had the effect of confusing the fake with the real thing.

It would be best to create something new.

Aviation and machinery manufacturing are, after all, two related but parallel industries.

Then, there is reason to believe that even if the same person cannot create the same miracle in the field of mechanical industry, at least it will not be too bad.

So much so that relevant urban legends are still circulating more than 20 years later.

Although the Committee of Science, Technology and Industry has much more powers than before, the unified power and responsibilities also mean that there are many more places to spend money, even a lot of money.

Especially through the Boeing-McDonnell Douglas merger, almost the entire civil aviation industry in China has been revitalized.

Even though he had been mentally prepared before, he never expected that the time node set by Chang Haonan would be before the new century.

This is also an important reason why Ding Gaoheng finally made up his mind to speak.

So in terms of funds, not to mention tightness, at least not to the level of deep pockets.

"The 50th anniversary gift... is a good title. If it can be done, it will definitely be great news for us, especially the Equipment Industry Department, and it can also stop many people's mouths."

Chang Haonan asked tentatively.

Having said all that, Chang Haonan thought about it for a while and decided to tell the truth.

“That…the resources of the Equipment Industry Department…”

In fact, it was not entirely his intention to seek advice from Chang Haonan on the selection of the leader of the Equipment Industry Department.

“I need to determine how many resources to allocate to the Equipment Industry Department in the past two years based on your timetable.”

“Configure it according to the time node you mentioned. Under the premise of ensuring that the basic business of other departments is not affected, as long as our Science and Technology Commission system can get it, you will give priority to calling it!”

Ding Gaoheng made a judgment in the blink of an eye—

Intensify your investment in die forging presses, it's worth it!

That's pretty much it for talking about the important things.

He originally wanted to stay with Chang Haonan for lunch, but when he thought about the other party's recent work arrangements, he decided to put it aside for the time being.

Ding Gaoheng looked at Chang Haonan's back as he was about to go out, then suddenly stopped him and added:

"As for Secretary Lan, just report to me directly. There is no need to submit written materials."

"clear."

Similar to the situation with the turbofan 10, the design of the die forging press cannot be completely determined at once.

After the overall R&D route is determined, there are still many specific technical details that need to be optimized.

The technical seminar held by Chang Haonan is precisely to solve these problems.

“Mr. Chang, according to the method you instructed before, we have completed the model construction and meshing of the overall frame of the forging press. The static analysis of the equipment has also gone smoothly and no problems have been found.”

Yan Yongnian stood on the podium in the small conference room, pointed at the PPT on the curtain and introduced to Chang Haonan who was sitting at the head of the conference table:

“As you emphasized before, the first ten natural frequencies of the forging press are 0.40618, 0.43178, 0.64196…”

“We checked the data of the same type of die forging presses abroad and found that the frequency under working conditions is around 0.3, and there is no risk of resonance…”

“Wait a minute.” At this point, Chang Haonan suddenly raised his hand and signaled Yan Yongnian to pause:

“Of course it's okay to refer to mature foreign data for analysis, but for this working frequency, it shouldn't be difficult for us to calculate it ourselves, right?”

“Although I have no objection to the value of 0.3, there are some things that are best done by yourself.”

Facing Chang Haonan's question, the nearly fifty-year-old full professor of Qinghua University felt a sense of oppression for the first time.

He raised his hand to wipe the non-existent sweat on his forehead, and then explained in a weak voice:

“This is the problem we are facing now.”

“After the static calculation, the original plan was to calculate the stress distribution of each structural member under working conditions, but we found that it is difficult to conduct stress analysis on the local composite load-bearing structure.”

"Our meshing was done using hexahedral elements in the TORC Multiphysics software. However, during the calculation process, the calculated local stresses were always too high. This indicates on the one hand the uneven transfer of force flow between the combined load-bearing components, and on the other hand On the one hand, it also shows that the deformation between contacting bodies is uncoordinated..."

"Considering that fatigue damage is the main reason for the failure of heavy equipment, this problem must be quite fatal. If not solved, it can easily lead to gaps in the contact interface between components that come into contact with each other after being subjected to load, which will be fatal to the equipment. destroy…"

“So we must first complete the optimization design, and then start calculating the dynamic data under working conditions, otherwise the calculated results will be meaningless...”

In fact, if we go by our previous work habits, we can determine the specific problem in such a short period of time, which can be said to be a pretty good achievement.

But in Chang Haonan's case, Yan Yongnian was nervous until the end of his explanation.

“Seats between parts in contact with each other…”

Chang Haonan looked at the equivalent stress diagram of the C-shaped plate and the cross-key on Yan Yongnian's PPT, lowered his head and made a note on the paper in front of him.

“In other words, there should be a problem with the modeling of the interference connection structure?”

Yan Yongnian and several other subsystem leaders looked at each other, and then nodded:

"It should be that the contact between the various components of the die forging press is a three-dimensional contact problem, and there are uncertainties in the mechanical conditions of the contact surface. We have tried to use the test-error method to iterate normally, but the calculation efficiency is very low, and the convergence is not yet Difference…"

Obviously, they have thought about it and worked hard.

It just failed.

Chang Haonan stared at the computer screen, which was the setting program for calculations by Yan Yongnian and others.

Stress is not concentrated. If it is a manufacturing problem, let's talk about it. If it is a design problem, it is definitely a huge hidden danger.

After a period of silence, Lin Qingsong, who was seconded from the Northern Vehicle Research Institute, spoke again and explained:

“This is the most difficult problem in the entire design plan. If Chang can bring a solution to the next meeting, the subsequent optimization part should be very efficient.”

"No."

Chang Haonan still didn't raise his head, just waved his hand:

“There is no need to hold a meeting next time.”

“There are generally four solutions to this problem. As for which one to use, you can evaluate it yourself.”

"ah?"

Lin Qingsong, who just wanted to find a place for Yan Yongnian to get off the stairs, was immediately dumbfounded.

These are not the four ways to write the word fennel. You can know it by reading more books, but it is not of practical use yet.

The problem of weak point cracking caused by uneven stress distribution is a huge problem not only in China but also around the world.

Under normal circumstances, if the impact is not particularly large, you can only bite the bullet and replace parts more frequently.

In any case, fatigue damage is not unusable in the first place, it is just a matter of lifespan.

If the impact is large, then generally only targeted reinforcement will be needed.

Including Lin Qingsong's own job—heavy vehicle design—also faces a similar situation.

Each time it takes several years, or even longer, to slowly test and solve.

As a result, Chang Haonan came up with four solutions...

Chang Haonan signaled Yan Yongnian to return to his seat first, then walked to the podium, picked up a pointer and pointed at the equipment model on the curtain:

"In the working state, a small closed-loop force cycle is formed in the upper part of the forging press by the C-shaped plate, cross key, large tie rod, and clamping beam. During the forging process, the force generated by the hydraulic cylinder acts on the upper plate beam and then It is passed to the C-shaped plate, then passed to the large tie rod, clamping beam, and finally returned to the C-shaped plate through the cross key.”

"So, the most important part here is the cooperation between the cross key and the C-shaped plate. The contact state between the two will not only affect the characteristics of the force flow transmission, but also affect the deformation of the whole machine in all directions. Influence."

“So the key point is to have a gentle transition in the combined structure so that stress and deformation can be transmitted smoothly and harmoniously.”

Having said this, he turned back and looked at the dozen or so people sitting below:

“At this point, approved?”

Everyone's reaction was quick or slow, but basically everyone nodded to show they understood.

“Then the solution is accordingly.”

Chang Haonan pulled over the blackboard next to him and picked up a piece of chalk:

"First, uneven interference can be set without changing the shape of any component, which will not weaken the strength of the component itself. As for the specific method, TORC Multiphysics provides a function called 'bonding'. You can glue two parts with different meshes together..."

“Here, as long as the interference setting satisfies Δ(min)=pd(C1/E1+C2/E2)*10^3, where E1 and E2 are the elastic modulus of the contained component and the containing component material respectively. quantity…"

“Second, based on the force flow analysis I just conducted, I modified the shape of the contact surface between the cross key and the C-shaped plate to reduce the displacement of the two components under pressure..."

"Third, the gapping problem just mentioned is actually due to the additional moment generated by the preload force and the reaction force of the main cylinder. It can be considered to modify the lower part of the wedge key into a shape with a certain slope. To balance this additional moment..."

“The idea of the fourth method is similar to the third one, but it is achieved by changing the component structure...”

On the stage, Chang Haonan's thinking became more and more clear.

In the audience, everyone also followed his train of thought and wrote furiously.

Of course, when I write, I have to write hard and fast.

The idea can only be revisited later when we go back.

Until two blackboards were filled with writing, Chang Haonan finally explained the four solutions he had just thought of.

He turned around, originally wanting to ask everyone what they thought.

But looking at the expressions of frowning and thinking, or at a loss, this question was not asked after all.

There are some things that would be impolite to say.

Fortunately, the people who can sit here are not ordinary people.

The reason why I couldn't follow the train of thought for a while was just because he talked too fast and jumpyly, rather than because I really couldn't understand it at all.

Go back and review more, you will always understand.

“Mr. Chang, why are you so skilled...”

A slightly younger technician looked at his notebook in front of him and let out a long sigh.

Chang Haonan naturally couldn't directly say that I was cheating, so he had to hold it in for a long time and replied:

“Perhaps it's because I designed TORCMultiphysics…”

(End of this chapter)

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