Over the next two days, several more researchers working in related fields arrived.

In fact, if it is in a country with a relatively good scientific research foundation, this kind of problem can be directly sent out as a research topic in the name of the 606 Institute or the Commission of Science and Technology and Industry, just like the wing flutter analysis for the MA60 project, and let several research groups carry it out separately.

In addition to competing with each other, maybe something else can be done in the process.

In fact, a lot of the technological accumulation of first-mover countries comes from this -

When I came out of the research, I didn't know what it was for, but at some point later, I suddenly realized that it was very important to a certain field.

For example, the algorithm proposed by Chang Haonan at that time has now been applied in many fields such as construction, machinery, and energy, and has even been fortunate to become part of the national standard in some industries.

However, with Huaxia's current technical foundation, it would be a bit of a waste to do it like this.

As a late-developing country, the road that has not been traveled by predecessors is likely to have additional gains from a trip, but if others have already walked it, it is better to cross the river by feeling the stones.

What's more, the schedule set by Chang Haonan for the turbofan 10 does not allow for such slowness.

With the support of a large number of professionals, the speed of research has been significantly increased.

"In fact, with the development of the elastic flow theory, with our current ability, we can fully consider the role of elastic hydrodynamic lubrication on the basis of the past quasi-static model, and calculate the oil film thickness and pressure distribution ...... of the rolling element/ferrule contact zone under oil lubrication more accurately."

Wang Qinli stood in front of a blackboard and was introducing his current research direction.

"Professor Wang, wait......"

Another professor Zhang Qinggang from Northwest University of Technology took advantage of his drinking water and asked:

"Then how do you deal with the drag force of the oil film, and the ferrule control theory in the Jones model, if you want to perform dynamics, or even if you want to perform quasi-dynamic calculations, it is impossible to continue to use this assumption......"

Due to the relatively slow speed of information transmission in this era, although we have occasionally met in the past, the communication at the academic level is basically limited to publishing articles, and the paper is a summary of the research results, which is not as intuitive and comprehensive as face-to-face.

Especially for peers, many times the mistakes and repetitions in the research process of a research group are more enlightening than the research results themselves.

And these things can't be seen just by looking at the paper.

Now Chang Haonan suddenly brought these old people together, although the former himself has not yet expressed his position, but just by virtue of their exchanges, there have been a lot of sparks.

"As long as the oil film thickness calculation formula is combined with the Newtonian fluid model to calculate the shear stress on the contact surface, and then the integration can be obtained, and the result we calculate is that there will be a gap of about 10%-20% with the actual situation, but as a quasi-kinetic calculation, it can play a guiding role in the general direction."

Wang Qinli put down the thermos cup and continued to answer the questions of his peers:

"As for the Jones model......

He smiled playfully as he spoke, and turned back to quickly draw a diagram on the blackboard.

"A year ago, we really didn't have a better way, but now, we can use the displacement-deformation compatibility conditions between the rolling element and the ring to determine the deformation and force of the rolling element and the ferrule, solve the partial differential equations to obtain the revolution and rotation speed of the rolling element, and then obtain the geometric relationship and load distribution inside the bearing......"

"Of course I know this, but there will be strong nonlinearity in the working state of the bearing, how can I ensure that we can obtain a usable numerical solution?"

Zhang Qinggang can naturally understand what Wang Qinli means, in fact, considering the theory of elastic flow lubrication is also the direction he is studying.

But in engineering matters, many times it is not just a matter of making sense in theory.

The result is not calculated, everything is equal to zero, and it is not easy to say anything.

"Is this...... I have to mention Mr. Chang. ”

The latter said and glanced at Chang Haonan, who was sitting on the other side of the classroom and bowing his head to record without saying a word:

"As one of the first users to apply for a trial of TORCH Multiphysics, several colleagues have solved many similar problems of solving strong nonlinear partial differential equations through the numerical solution module there, and I worked with one of the professors who does gear research to finally develop a new computational model, which is simply ......"

Subsequently, he spent more than ten minutes to report his new achievements in the most concise language.

"Considering that I am not the only one who has contributed to this work, I have decided to name this model the 'Ice City Model' for the time being."

Speaking of this, Wang Qinli's eyebrows fluttered, and it was obvious that he was very happy to be able to show off in front of his old colleagues and opponents.

“……”

The muscles on Zhang Qinggang's face twitched slightly.

Despite objective factors, with similar research directions, people are ahead of the curve, and it is really difficult for him to say anything.

However, Wang Qinli continued to jump his face:

"So, if Professor Zhang doesn't understand this, it doesn't matter, just use our model to substitute the calculation......"

At this point, Chang Haonan, who was a little worried that the two old comrades had evolved from an academic contest to a physical contest in front of him, felt that it was time for him to end this discussion.

Otherwise, I'm afraid it won't end well.

He put his notebook aside and stood up.

Wang Qinli consciously turned over the blackboard, then moved to Chang Haonan's side and sat back by himself.

"First of all, thank you very much for the discussion just now, which not only allowed me to determine the development level of domestic high-speed bearings, but also gave me a lot of inspiration."

Be polite or polite first.

But immediately after the next sentence, he looked at Wang Qinli, who had just sat down.

"Professor Wang, your model is indeed a leap forward compared with previous theories, but there are still several problems."

"First of all, the Newtonian fluid assumption of the lubricant should produce a relatively large error in the calculation results when the sliding condition is more serious, and when the bearing moves at high speed, the characteristics of the lubricant will also deviate from the ideal Newtonian fluid, so I personally think that this model should be more suitable for the scenario of heavy load and low speed, which is exactly the opposite of the working state of the aviation engine bearing that we want to solve now."

Wang Qinli was just habitually showing off, and there was indeed no problem with what Chang Haonan said:

"It is true that Mr. Chang is the president, and in a word, we developed this theory in the process of developing bearing parts for the heavy-duty turbine equipment produced by the Bingcheng Boiler Plant."

Zhang Qinggang, whose face was almost green, finally secretly breathed a sigh of relief.

Seeing that the atmosphere was finally more harmonious, Chang Haonan turned around and quickly wrote a few points on the blackboard:

"The bearings used in aero engines have to face extremely high temperatures during the working process, and they have to bear huge external overloads together with the aircraft, so they are very different from the ordinary bearings you have studied in the past."

"Therefore, our next research directions are mainly the following points, the first is to consider the coupling nonlinear effect of the aero engine rolling bearing and the extrusion oil film damper, regard the motion of the aircraft as the implicated motion of the rotor system, and establish a dynamic model of the flexible asymmetric rotor system with the nonlinear support of complex structures under maneuvering flight conditions......"

"Secondly, considering the damage fault of the outer ring of the intermediary bearing, the shock and vibration characteristics of the double rotor system of the intermediary bearing under the motorized load environment are studied, and the mechanism of amplitude and frequency modulation of the rotor speed ratio, the magnitude of the motorized load, the damage span of the bearing and the rotor speed on the impact vibration of the multi-rotor system are analyzed......"

"Then ......"

"Finally, combined with the above theoretical and engineering foundations, based on the idea of damage tolerance, the optimal design of aero engine bearings based on complex cyclic conditions is carried out."

After the introduction, Chang Haonan put down the chalk in his hand and looked at the professors who were still bowing their heads and writing hard:

"Considering that the basic design of the turbofan 10 engine has not yet taken shape, we will temporarily design based on the Spey MK202, and the relevant data will be provided by me, but you should note that this project involves confidentiality issues, if you want to bring students to participate, you must explain the situation to them in advance."

"As for the goal, the initial goal is to increase the life of the three fulcrum and four fulcrum two bearing groups to ten times the original!"

"Ten...... Ten times? ”

Hearing this goal, even Wang Qinli's hands trembled and he almost threw the pen out.

As a pure mechanical part, it is generally believed that it is difficult to make any leaps and bounds, and their past research results are basically 30%-50% of this improvement, even if it directly introduces foreign advanced technology, that is, 2-3 times the level.

As a result, now he opens his mouth by an order of magnitude?

Chang Haonan was not surprised by such a reaction, but nodded lightly:

"Well, at present, the average life of these two parts is less than 300 hours, if it can be increased by ten times, it can achieve the same life of parts and the whole machine, so that a lot of structures can be saved in the design just for the convenience of replacement, which is conducive to reducing the structural complexity and weight of the engine."

"This is a crucial part of the new generation of engines that must be broken through!"

(End of chapter)