The military-industrial scientific research system of the academic master.

At the same time, here at Beijing Hang University.

Chang Haonan's research on high-speed rolling bearings has also entered the most critical stage.

For him, if he really just wants to design a single bearing product, whether it is for turbofan 9 or turbofan 10, it is actually not difficult.

After completing the scattered things during this period, I once again saved about 300 scientific research points, which was enough to complete a mere bearing design project.

But Chang Haonan no longer has this ambition.

When I was first reborn, there was no way I could spend scientific research points on specific projects. After all, if I didn’t have some solid and persuasive achievements, I couldn’t just rely on words to persuade others to change the direction of national-level policies——

Even if he had full points in his verbal skills, he had no way to speak at that time.

However, that was then, and now is now. Now that Chang Haonan has the ability to influence the direction of the industry, the perspective on things must be different.

The reason why he wanted to bring together several top research groups engaged in high-speed bearing research in the Science and Technology Commission system was not only to speed up the research progress, but also to prepare to promote the level of the entire industry.

And even with a tool like TORCH Multiphysics, whose computational efficiency is an order of magnitude higher than in the past, to achieve this goal, the data obtained during the research process is more important than the results.

"Mr. Chang! The first batch of experimental results have come out!"

A young man wearing blue overalls and goggles quickly walked up to Chang Haonan, who was looking at a table on a row of bearings in front of him.

Zhang Jing is a doctoral student in Wang Qinli’s research group.

He is similar in age to Chang Haonan, and if I have to say, he is even several years older than the latter.

When he was first asked by his mentor to work on a project in Beijing, his original intention was to refuse.

For graduate students, especially graduate students in this era, traveling is definitely a chore.

The helpless man had to bow his head under the eaves, and was finally dragged over by Wang Qinli.

However, after seeing Chang Haonan's research efficiency before and understanding the research topics they would be responsible for next, he quickly became very enthusiastic and devoted himself to the assigned work.

After this period of time, if I hadn't still recited some of the ancestral precepts of respecting teachers and respecting morality, I would have forgotten Wang Qinli.

The experiment he mentioned was Chang Haonan's concentrated test of his results during this period.

"Go and have a look."

Chang Haonan put down the form in his hand, inserted the pen into the breast pocket of his lab coat, and strode towards another room not far away.

There, a dozen pieces of equipment that were rotating at high speed were making a low roar.

Although the experiment has ended, it is obviously impossible for the equipment under high-speed rotation to stop immediately from 1.5 rpm, so the bearings being tested inside still need to wait for a while before they can be taken out.

However, the impact and vibration data recorded during the entire process can still be viewed.

Chang Haonan went straight to the computer with the No. 1 logo on it.

Several professors, including Wang Qinli and Zhang Qinggang, who were responsible for different research contents, consciously gave him a position with the best angle.

"Mr. Chang, according to the recorded data results, the RMS amplitude of the rotor acceleration signal before maneuvering flight is 0.1190m/s^2, and the RMS amplitude during maneuvering flight is 0.1957m/s^2, with an increase of 64.45 %; the RMS amplitude of the bearing contact force pulse signal before maneuvering flight is 19.5124N, and the RMS amplitude during maneuvering flight is 37.4275N, an increase of 91.81%, which is very close to the prediction result of your improved mathematical model. Comprehensive The error is within 8%.”

Wang Qinli's voice was trembling when he reported the results.

You should know that the model he improved on the Jones model before can control the dynamic performance prediction error of low-speed bearings under normal operating conditions to about 15%.

This has made Wang Qinli feel that he can leave his name in the field of mechanical processing, and even considered naming it Qinli Model.

However, it only took Chang Haonan less than half a month to raise the accuracy to a new level?

Zhang Qinggang next to him had completely forgotten that there were other people around him, almost holding the screen and muttering to himself:

"It's so accurate, it's so accurate..."

For an engineering model, this accuracy is almost as good as a dream.

However, Chang Haonan was not surprised by this. In fact, when everyone had the first meeting, the idea proposed by Wang Qinli was already quite forward-looking, and he made some modifications on it, including assembly interference, Taking into account several factors such as temperature differences and external maneuvering overloads that were previously difficult to calculate due to strong non-linearity, it is obvious that the accuracy has been greatly improved.

After looking at the data on several computers, everyone's attention has shifted to the experimental equipment not far away.

In fact, the dozen or so pieces of equipment that are decelerating next to them have been running continuously for hundreds of hours.

For the life equivalent accelerated test, these bearings have also reached the end of their life, which can be seen from the obvious abnormalities in the data recorded on the computer compared with steady-state operation.

The bearings tested in each piece of equipment have specially designed typical structural parameters.

According to the calculations made by Chang Haonan before the experiment, each of them will correspond to different failure modes.

The dynamic performance prediction is only a small part of the content. The final test is whether the calculation of the bearing failure mode can correspond to the actual situation.

If it can, it will directly bring China's bearing industry and even the entire machinery manufacturing industry into a new era.

An era of overtaking on a straight line!

Although this process may not be completed in three or two years.

But for Chinese researchers, difficulty has never been a problem.

The problem is that there is no hope in the past.

Better products of others mean more users, and more users means more and more valuable data generated, and this data can be fed back to further optimize products.

Basically all high-end industries meet this virtuous cycle model.

In this case, if you want to achieve transcendence, you must either wait for major changes in the external environment, or simply change a track.

But what Chang Haonan did was completely unreasonable and broke this cycle.

Under a better algorithm framework, the amount of data I need to optimize the product may be only one-tenth or even lower than yours, so the gameplay is different.

Soon, more than a dozen pieces of experimental equipment stopped running one after another.

After a period of cooling, the operator in charge of the experiment took out the bearings one by one.

"According to calculations, the No. 2500 bearing has a maximum contact stress of 125Mpa during operation, and the maximum shear stress of the subsurface layer is about mm from the surface. The failure mode is speculated to be fatigue spalling originating from the subsurface layer."

Chang Haonan was able to repeat the calculation results of each bearing without even looking at the labels on the equipment.

"Yes, the peeling area is about 50mmx15mm, the subsurface butterfly structure is about 105~129mm away from the raceway surface, and the maximum length is about 40mm..."

"The No. 2.38 bearing has a maximum dn value of 106x300mm·r/min during operation, and the instantaneous temperature in the contact area reaches over c. The failure mode is presumed to be the fracture of the bearing ring and cage."

"No. 3 bearing, bearing raceway and cage surface wear failure..."

"No. 4..."

"..."

"No. 16, pitting corrosion failure originated from the bearing raceway surface..."

After Chang Haonan reported the malfunction of the last experimental subject, there was no other sound in the entire laboratory except the hum generated by the operation of the computer mainframe.

"How is the result?"

After a few seconds of silence, Chang Haonan turned around and looked at the dozens of people in front of him.

Zhang Jing held an experiment record book in his hand. At the end of each line of content, there was a check mark.

"They can all be matched!"