Chapter 1115: Nuclear issues?


    For Chang Haonan, compared to directly using the Practical No. 7 satellite constellation and the immature Beidou generation to make do with testing autonomous orbit determination technology, just verifying a maximum power point tracking is obviously just a casual thing, and it is not It requires too much extra effort on his part.


    Zhang Weiyong and others can still complete it alone.


    More importantly, the risk is very small and will not affect the mission load of the constellation itself.


    Meng Zhizhong originally wanted to give a chance to his colleagues who failed to be elected academicians this time. Although it seems that it will take a few years to get promoted, based on the actual situation, the final test efficiency will be higher.


    Naturally, both parties are happy.


    It happened to be at this time that Lu Yongxiang, Xu Dikuang and others who had just left also returned to the conference hall.


    "Comrades."


    Considering that it was the dean of the Academy of Sciences who was speaking above, it was now the turn of the Academy of Engineering to show their face.


    As Academician Xu took the stage, the conference hall, which was a little noisy just now, quickly calmed down again.


    "Preparations for the certificate awarding ceremony have been completed. Comrades, please follow the guidance of the staff and move to the auditorium..."


    Chang Haonan, who was sitting in the front row, could feel the air behind him almost solidifying at this moment without even looking back.


    After all, in principle, only after obtaining the certificate can one be considered an academician officially recognized by the organization.


    Although in practice few people would bother with such details, people still need a sense of ritual.


    Perhaps because of this, everyone showed quite high enthusiasm.


    In just a few seconds, a large number of people had already stood up in the entire conference hall.


    In fact, Chang Haonan also wanted to go out quickly, but he had no choice but to sit in the first row. As a side hall, there was no side door, so he just took a look at the dark situation behind and put his buttocks back down.


    However, in the eyes of outsiders, this behavior seems to be a sign of a stable mentality.


    Especially Academician Lu, who had admired Chang Haonan before, even praised him slightly in his heart.


    "Academician Chang."


    After thinking for a moment, he went straight to Chang Haonan and sat down again:


    "After the certificate awarding ceremony is over, don''t leave in a hurry..."


    "???"


    In fact, it was not difficult to hear Lu Yongxiang when he was on stage just now. He had a Zhejiang accent when he spoke, so he usually slowed down his speech when communicating with others.


    But even if he knew this was the case, Chang Haonan almost couldn''t hold his nerves because of the phrase "don''t leave after school", and it took a lot of effort to suppress his smile.


    "Academician Qu and I would like to discuss some business matters with you. Of course, we would also like to deepen our understanding of each other..."


    This surname is not very common. Chang Haonan briefly recalled it and only remembered Academician Qu Liangsheng who had asked him a question before.


    It''s just that these two people have never had any contact with him before.


    Moreover, one is a dean in the field of mechanical fault diagnosis, and the other is an expert in fluid transmission and control. They seem to have no direct connection with the projects at hand...


    However, after all, it was the dean of the Academy of Sciences who had spoken, and Chang Haonan still agreed.


    As a result, when he participated in the certificate awarding ceremony later, he was a little absent-minded out of curiosity.


    Fortunately, with more than a hundred people, even if they came on stage in batches, the schedule was very tight, so no one noticed this.


    Compared with the previous symposium, the certificate awarding ceremony was much longer because of the high-level leaders.


    By the time the ceremony ended and lunch was over, it was already two o''clock in the afternoon.


    Because Academician Lu didn''t say anything more specific at that time, Chang Haonan had to wait at the door of the Great Hall.


    But soon, he discovered that the place he chose didn''t seem to be a good one...


    After saying hello to countless colleagues who were also about to leave, Chang Haonan, who was thirsty and thirsty, finally heard a familiar voice coming from behind:


    "Academician Chang!"


    He turned around and saw Qu Liangsheng coming down the stairs not far away.


    Beside him, there was a staff member supporting his arm—


    The other party is 72 years old, has been working on the front line for many years, and has never been in good health.


    After walking closer, Qu Liangsheng continued:


    "Dean Lu was just called away by his superiors. It seemed that he wanted to discuss some policy issues... He said that we should go inside the hospital and wait for a while. He should be there soon."


    The Academy of Sciences is not only a spontaneous association of high-level scholars, but also the country''s highest-level advisory body in the field of science and technology.


    As the dean, it is normal for Lu Yongxiang to participate in discussions and even decision-making during some policy formulation processes.


    "good."


    Chang Haonan was about to nod, but stopped:


    "Academy of Science or Academy of Engineering?"


    This question stunned Qu Liangsheng, who had just stopped.


    He immediately realized that although Lu Yongxiang was the president of the Academy of Sciences, the three of them together had a total of five academician titles.


    If we really want to talk about a common identity, it would be in the Academy of Engineering...


    "I forgot that you are also an academician on both sides..."


    Qu Liangsheng shook his head helplessly, and then said in a half-joking tone:


    "Now, I have become the laggard..." Chang Haonan stepped forward and prepared to lift up the other side of Qu Liangsheng''s body:


    "It''s just that the division of labor is different. There''s no way to say that you can''t hold back..."


    But the latter broke free together with the staff next to him:


    "Okay, okay, Xiao Liu, just go and drive first. I''m not old enough to walk on the road... Being held up like this by the two of you makes people think that the old man made some mistake and was taken away..."


    After finishing speaking, he adjusted the tie around his neck and continued:


    "Dean Lu didn''t say anything just now, but there will be a car leading the way, so we just need to follow..."


    …


    From the City Hall to No. 52 Sanlihe Road, you don’t even have to turn.


    Go west along Chang''an Street and Fuxingmennei Street and you''ll arrive.


    The total distance is only about two kilometers.


    Therefore, not long after, Chang Haonan and Qu Liangsheng were already sitting in a conference room of the Academy of Sciences.


    And as he said, Lu Yongxiang didn''t let them wait too long, and quickly rushed back after a long journey.


    "I''m really sorry...I took the initiative to meet, but ended up leaving you two here..."


    He apologized to the two of them while taking off his coat.


    Of course, no one could really blame him for this little thing.


    So the three of them quickly got to the point.


    "Academician Chang, during the academician selection stage, I have seen the materials you submitted...one of them said that you have already applied electromagnetic bearing technology in actual projects?"


    Lu Yongxiang got straight to the point.


    At this moment, Chang Haonan understood a little bit.


    Electromagnetic bearings are necessary supporting components in ultra-high-speed rotating machinery in the future, and the fluid transmission field that the other party focuses on needs this type of equipment.


    "Yes, we have applied research in this area."


    He replied:


    "However, in terms of specific projects, it is currently only used on a jointly developed foreign engine, and there is still a mechanical backup, mainly used to collect user data, so it has not been used on our own models."


    "So that''s it..."


    Although Lu Yongxiang''s tone was calm, judging from his expression, Chang Haonan''s answer surprised him a bit:


    "I wonder if it would be convenient for Academician Chang to reveal how you solve the rotor life problem caused by excessive load during ultra-high-speed rotation?"


    The research on electromagnetic bearings itself is actually relatively mature.


    But this is still an accessory.


    Bearings can support tens of thousands or even hundreds of thousands of rotational speeds per minute, but it does not mean that equipment with bearing loads can also support it.


    In particular, electromagnetic bearings have no rigid contact, so fundamentally there must be more serious gyroscopic effects and vibration interference. Moreover, at ultra-high speeds, the rotor needs to pass through multiple critical zones within the operating speed range, and the control logic is more complicated than traditional bearings. complex.


    No wonder Academician Lu is so eager.


    However, Chang Haonan smiled bitterly and shook his head:


    "It''s not an inconvenience because we haven''t solved it at all..."


    "Um?"


    "ah?"


    The two academicians opposite were shocked at the same time:


    "Then how did you pass the life and reliability tests..."


    Upon seeing this, Chang Haonan quickly explained:


    "We chose electromagnetic bearings just to provide part of the power and reduce the number of parts..."


    "So, SeA650 actually only has the No. 1 fulcrum, which is the outermost fan that uses electromagnetic bearings... Academician Lu should know something about this. The speed of the fan is much lower than that of the compressor and turbine, generally only a few thousand revolutions per minute. , it may be even lower during cruising, so there is no radial load pressure..."


    Upon hearing this answer, Lu Yongxiang and Qu Liangsheng''s eyes dimmed for a moment.


    However, it soon returned to its original state.


    After all, they are all academician-level bosses, and it is impossible to just rely on others to feed them.


    "This is the case."


    This time, it was Qu Liangsheng who spoke:


    "Dean Lu and I are currently studying the electromagnetic bearing-flexible rotor system that is used for ultra-high-speed rotating equipment. However, the software and hardware foundation in Jincheng is relatively poor... If we build it from scratch, it will consume immeasurable money. Funds and time, so I was wondering if I could cooperate with you, Academician Chang, and by the way, I could also make use of your group’s existing experience and testing platform..."


    Chang Haonan was very familiar with this kind of operation.


    However, it was usually initiated from his side before.


    "Ultra-high-speed rotors... If we plan to fully use electromagnetic bearings on the new generation of aircraft engines in the future, there will indeed be a demand..."


    After thinking for a moment, he slowly said:


    "But I want to know, in what areas was this research that you two were originally intended to be applied to?"


    Lu Yongxiang and Qu Liangsheng looked at each other.


    "Ultra-fast centrifuge...or to put it more directly, it extracts high-concentration nuclear fuel!"


    (End of chapter)