Chapter 715 Sorry, I just figured it out

"So, is this compensation satisfactory?"

Ding Gaoheng, who had his legs crossed, was smiling.

Chang Haonan is still a layman after all, and he never denies this.

"I'm so satisfied. Thank you to the organization for their unconditional trust in me!"

Therefore, facing this rocket-like promotion speed, he did not hide his happiness:

At this time, it seems too deliberate to tuck it in and dress darkly.

It is a good thing that the city is deep, but it may not necessarily be seen that the city is deep.

"Don't give the organization a high hat either."

Ding Gaoheng waved his hand:

"The trust of the organization is also gradually increasing. It is impossible to entrust important tasks just because of one or two things, or the recommendation of one or two people. Especially in your case, it is definitely an exceptional promotion, so although you have not reached the level, you are still in the middle management Sequence, the final decision to make this appointment must be made after comprehensive consideration.”

"Furthermore, the position given to you is that of a chief planner, which is usually not set up separately, rather than a deputy general manager in charge of a certain business. This is also considering your age and your lack of experience in directly managing a very large organization. You need to work in Torch The group needs to practice for a while.”

"If my guess is correct, Torch Group may be subsumed under the Aviation Development Group within three years or by the end of this year or next year."

Chang Haonan was also involved in the aviation industry in his last life, so he naturally knows the gold content in it:

"When Chief of Staff Fu said it before, I was thinking that it might take a while to cool down, but I didn't expect that it would happen so soon..."

"It can be considered as cooling down. There are still three months until I officially take up my post."

Ding Gaoheng said half-jokingly:

"Besides, if you fail to get your doctorate this year, this appointment will automatically become invalid..."

At this point, the two people facing each other laughed.

Chang Haonan's achievements in the past two years, even if only the non-confidential parts are shown, are enough for at least dozens of Ph.D.s to graduate successfully.

As for why it is stated that the appointment was made on July 1999, 7, it is easy to understand.

Firstly, the Aerospace Power Group is still in the preparatory stage. There is currently only one preparatory leadership group, and July 7 is the day of the official inauguration.

Secondly, they are team members directly under the state-owned enterprises, and they are even central management cadres from the appointment level. It is impossible to simply give them the title of "agent" and be in charge of the work like the Torch Group.

So I have to wait until I officially graduate.

……

The sudden appointment at the department and bureau level did not bring much change to Chang Haonan's daily work.

After finishing all the matters before graduation, he returned to Jiangcheng again and prepared to follow up on the trial production of the heavy-duty die forging press.

The hardware installation of the die forging press body has been basically completed, but the trial production is not only about starting up the equipment, but also about producing a complete and usable product according to the process requirements.

"Mr. Chang, as usual, trial production usually involves building an ordinary C-shaped beam or other partition frame structure with a relatively simple shape."

Several leaders of the die forging press project team, including Chang Haonan, wore safety helmets and walked next to the forging press, which was as grand as a tall building. The speaker was Yan Yongnian, who was holding an engineering drawing in his hand:

"However, when our forging press is put into trial production, there should be many leaders, including senior leaders, coming, and I heard that Airbus has also applied to send people to visit. Many of them are experts. If it is just Producing the same workpiece as other hydraulic presses will not fully reflect the power of our equipment. "

Chang Haonan nodded to show that he understood:

"So I have told Factory 112 that they will send the latest structural design results and the process parameters of the rear fuselage frame of a fighter jet, and we will conduct trial production. Of course, if the trial production process goes well, then It will soon enter the formal production stage.”

The second-generation improved Flanker airframe with internal number 9902/803 was designed at the beginning of the year and will be used in all subsequent Su-112 improvements produced by Factory 27 and the Komsomolsk Factory.

The only exception is that Russia cannot sell models using this second-generation airframe to countries surrounding China.

Compared with the first-generation improved airframe that only carried out structural reinforcement and added a pair of inner wing mounting points, it is basically equivalent to resetting the structural design of the aircraft while retaining the aerodynamic shape. Through more reasonable The weight reduction design is suitable for lighter radars such as 1493 or Beetle, and a retractable aerial refueling device and fuel supply pipeline are reserved at the nose position to support the installation of fuel liquid cooling equipment.

However, the new body involves several key integrated die-cast parts, a large number of titanium fasteners and a larger proportion of composite material application area. For China, there are certain production technical barriers.

Therefore, the No. 9902 verification machine previously used to test the 803/803 airframe was completely produced by Komsomolsk, but the test data was shared by both parties.

But if you want to mass-produce the fully upgraded J-11B, these difficulties must be overcome.

"If this is the case, then the look and feel of the trial production will be much better, but there may be foreigners among the visitors, which will not be good..."

"Don't worry about that."

While talking, Chang Haonan had already led a group of people back from the production workshop to the nearby process research and development center, and sat down in a conference room:

"Visiting the production process is just a long-distance view at the entrance of the production workshop. Let alone the control room, even the equipment itself is impossible for them to get close to. The production process cannot be deciphered by just looking at it from a distance."

"Then there is no problem on my side. The equipment software and hardware are currently normal. The remaining debugging work needs to wait until the car is started."

Yan Yongnian put down the folder in his hand.

Chang Haonan turned his eyes to the other side:

"Then... Next, Professor Lin Jingtang from the forging process group will introduce the development of the titanium alloy isothermal forging forming process."

The forging process team has a special position in the die forging press project team. They only joined in the middle of last year and are relatively independent in business. The focus of their research is not the die forging press equipment itself, but how to use the new equipment. Produce parts that meet process requirements.

But when they were dismissed, the equipment itself was often still under construction, so their research was always suspected of being slightly out of touch with actual production, and they were not taken very seriously before they participated in the development of die forging presses.

Fortunately, Chang Haonan himself has a background in numerical calculations and understands the importance of process flow calculations, so he added them to the team midway through the project.

"Okay, Mr. Chang."

Lin Jingtang nodded, then connected the laptop he brought with him to the projector and began to introduce his research results:

"The metal plastic forming problem is actually a boundary value problem. For rigid viscoplastic materials, the boundary value problem can be described as: at a certain stage of the quasi-static deformation process, the geometry of the deformed body, the internal temperature distribution, The uneven state of deformation and the current material parameters, and the velocity vector is given on the velocity surface and the surface force is given on the elevation surface, then the solution to this problem is the stress that satisfies the basic equations and boundary value conditions of plastic mechanics. Solutions for field and velocity fields.”

"In previous research, we found that materials that satisfy the rigid viscoplasticity assumption obey the Mises yield criterion and its associated flow criterion during the molding process. In all velocity fields that satisfy the dynamic admissibility condition, the true velocity The field will always minimize the total potential energy of the deformed body."

"Mathematically, it is equivalent to solving a functional minimum problem with volume incompressibility constraints. This is also the theoretical basis for our subsequent numerical calculations of all metal forging and forming processes."

"..."

"We have already submitted a calculation application to the Institute of Computing Technology of the Academy of Sciences. Regarding the aircraft partition that Mr. Chang just mentioned, if the size is not particularly exaggerated, it is expected to take about 3-4 months to calculate the results, which should be in time for the National Day. Before, I gave you a gift for the 50th anniversary..."

"..."

Chang Haonan listened very patiently to Lin Jingtang's introduction to his research content.

It should be said that the idea is relatively new.

Especially the part that uses Makarov's variational principle to solve the molding problem of rigid viscoplastic materials.

However, Chang Haonan frowned slightly after hearing the end.

Of course the other party's solution cannot be wrong.

It's just not subtle enough.

So it takes 3-4 months.

"Professor Lin, regarding the problem of solving the functional minimum, I have come up with an idea. Of course, there is no guarantee that it will be correct. You can try it."

Chang Haonan looked at the page full of formulas on the curtain, thought for a moment, then stood up, pulled out a drawing board, and scribbled on it:

“In the actual calculation process, it should be difficult to find a velocity field that satisfies both the velocity boundary and the volume incompressibility condition. However, the volume incompressibility condition can be introduced into the functional formula, so that it can be transformed from a constrained functional function. is a new functional without constraints.”

"For example, if you introduce a Lagrange multiplier λ into functional 27 on your PPT, you can get a new functional that is easy to solve by variation."

"..."

"Of course, there may be many specific volume invariance conditions. For example, introducing a penalty function should also have a similar effect, so I won't repeat it again..."

Lin Jingtang's expression was relaxed at first, then serious.

Then came the sudden enlightenment.

Finally it's back to ease.

After his expression changed like a revolving lantern, he slapped his thigh suddenly and made a crisp sound:

"I didn't expect Mr. Chang to also conduct research on metal plastic forming... If we had known this earlier, we should have discussed it with you before entering into research and development..."

Hearing these words, Chang Haonan quickly waved his hands:

"I don't have much research on your topic. I just have some opinions on the mathematical topics of solving functionals and strongly nonlinear partial differential equations..."

Lin Jingtang frowned and realized that things were not simple:

"Then...this is what you wrote."

"Cough-cough-"

Chang Haonan put down the pen in his hand:

"I just came up with it while listening to your introduction...a little bit of insight, a little bit of advice, a bit of advice..."