MTL - Into Unscientific-Chapter 476 structural problems

"Ladies and gentlemen, the plane has landed smoothly at Chengdu Shuangliu International Airport. The outdoor temperature is 14 degrees. Please pay attention to safety when taking out items from the luggage rack. Please pick up checked luggage at the baggage claim area. Thank you for choosing China Airlines. Flight! See you on the next trip!"

   Until the moment you walk out of the plane's inner door.

  Huang Yuting's mood is still a little complicated.

  The last news that made her deeply aware of the impermanence of the world was the death of her father, Professor Huang Danian.

  At that time, she was at the end of the semester, and she originally planned to travel to Changbai Mountain with a few classmates from the school, and the hotel and bus tickets were already booked.

   As a result, more than four hours before leaving, she learned that her father was critically ill, and by the time she rushed back to Chuncheng, it was already separated from heaven and man.

   And today.

  She has a deeper understanding of the four words of impermanence in the world.

   Twelve hours ago.

  She was still feeling sad about Lin Chen's resignation, and worried about whether the project team could continue, lest the phone ring on the other end would be a notice of the project team's disbandment.

  The result is twelve hours later.

  The place where she was standing changed from Chuncheng to Rongcheng. At the same time, she will go to the Xichang Satellite Launch Base to discuss matters related to the urgent research and development of the gravity gradiometer?

To know.

  Although she did send a letter of intent to Xichang Satellite Launch Base earlier, this letter of intent is not alone.

  After the drawings were released, Huang Yuting's team sent the same documents to more than 40 aviation organizations, large and small, across the country.

  Among all the sending objects, the Xichang Satellite Launch Base is actually not at the front, even at the end.

  After all, the whole project needs to consider not only the problem of balancing modules, but also the problem of measuring modules—this involves research at the particle level.

  So in Huang Yuting's view.

  The institutions that are more likely to accept the letter of intent should be those domestic research groups that engage in ultra-low temperature cold atoms.

  For example, the State Key Laboratory of Spectrum and Atomic and Molecular Physics, or the Optical Lattice Project Team under the Shanghai Institute of Optics and Fine Mechanics, the High Technology Research and Development Center of the Ministry of Science and Technology, etc.

  Like her father, Professor Huang Danian, the institution she cooperated with at the beginning was the Cold Atom Center of Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences.

   The result was unexpected.

  Xichang Satellite Launch Base actually adopted her structural drawings, and said that the problem of the measurement module has been solved. Next, they plan to quickly develop a gravity gradient meter to dig out the "Yongle Canon" in Yongling?

  This message is really progressive

  Magic.

To be honest.

  As a pure science student, Huang Yuting actually doesn't know much about Yongling and "Yongle Dadian".

  She doesn’t even know until now that the Yongling Mausoleum that she baidued in the waiting room is actually Qing Yongling Mausoleum. From the beginning to the end, she really only cares about one piece of information:

  Xichang is going to let this instrument land within seven days.

This sentence alone is enough for Huang Yuting to fly thousands of miles from Chuncheng to Rongcheng—in order to hurry, she and Lin Chen don’t talk about first class or business class, even the economy class is 34C, which is more expensive than ordinary economy class narrower position.

   Just when Huang Yuting was in a daze.

  Lin Chen beside her suddenly pointed in a certain direction, and said excitedly:

   "Sister Huang, look there!"

  Huang Yuting came back to her senses, and turned her head to look in the direction Lin Chen was pointing at.

  On the left side of the exit of the waiting hall, there is a person holding up a pick-up sign, with a few words written in colorful fonts on it:

  【Jilin University/Huang Yuting】.

  Huang Yuting was slightly taken aback when she saw this.

  Due to the fact that she has not produced any results in recent years, she has become a little unfamiliar with picking up airports, who rarely attends meetings.

  However, this is not the right time to be grateful for the encounters in life, so Huang Yuting quickly waved to Lin Chen and signaled:

   "Go, Xiaolin, let's go there."

   As she spoke, she pulled up her suitcase and led Lin Chen towards the airport pick-up point.

   After walking a distance of more than 20 meters, when Huang Yuting came in front of her, a very young man stretched out his hand to her:

   "Hello, Professor Huang, I am a member of the Xichang pick-up crew. I am from the University of Science and Technology of China. My full name is Xu Yun. You can just call me Xiao Xu."

  Huang Yuting subconsciously reached out and shook his hand.

   Then her eyes stayed on Xu Yun's face for a while, and suddenly asked:

   "Xu Yun, University of Science and Technology of China, I remembered, you are the Dr. Xu at the press conference yesterday, right?"

  Huang Yuting has never watched the press conference where Xu Yun was framed, but she followed the dark matter press conference of the Academy of Sciences yesterday, and was deeply impressed by Xu Yun, the "Heavenly Soldier".

  Xu Yun smiled slightly upon seeing this, took the luggage in her hand naturally, and said with a smile:

   "That's right, Professor Huang, that little Xu at yesterday's press conference is me."

  Huang Yuting let out a thoughtful oh, and then she quickly realized something, a trace of speculation flashed in her eyes:

   "Wait, Dr. Xu, could it be that the third-party institution that solved the computing module mentioned in the reply letter from Xichang Base is your University of Science and Technology?"

  Xu Yun nodded, leading the way and said:

   "Yes, Professor Huang, to tell you the truth, the original purpose of the dark matter particle experiment was actually to optimize the accuracy of the gravity gradiometer measurement module."

   "We have optimized the sensing level to the 10^-16m/s level by using the 'blinking' characteristic of dark matter, and we can keep it in reality for more than four hours"

"etc!"

  Before Xu Yun finished speaking, Huang Yuting interrupted him, and asked with a look of surprise:

   "Dr. Xu, did I hear correctly? What is the measurement accuracy you mentioned? 10^-16m/s?"

  Xu Yun nodded emphatically.

  Huang Yuting's pupils shrank imperceptibly, subconsciously wanting to say something impossible.

  Currently, the gravity gradiometer with the highest accuracy in the world is still the GOCE gravity gradiometer carried on the ESA GOCE satellite.

  Its perception accuracy is 10^12m/s, which is one trillionth of the gravity acceleration accuracy.

   And right now, according to what Xu Yun said.

  The accuracy of the measurement module of HKUST is 10^-16m/s, which is at least four orders of magnitude higher than that of the GOCE satellite!

   Indeed.

  GOCE satellite was launched in 2009, it has been 14 years since now.

  At the same time, as an important equipment in the current military, the highest public accuracy may not be the real number one.

  Gradiometers used in the military field by some foreign countries should be more accurate, and the numbers must be highly confidential to the outside world.

  But even if it is an advanced gravity gradiometer, the theoretical accuracy should fluctuate between 10^-13m/s and at most 10^-14m/s.

   Now the University of Science and Technology claims that their measurement module has reached an accuracy of 10^-16m/s, which obviously challenges Huang Yuting's cognition.

   But the problem is

  According to Xu Yun, the material used by HKUST is the flickering property of dark matter, which seems logically reasonable.

   After all, it is mysterious dark matter

  In addition, the University of Science and Technology gained a lot of limelight by relying on the press conference of the Academy of Sciences, and its image is much taller than before.

  Hence, Huang Yuting's doubts stopped abruptly in her throat.

  With this doubt, Huang Yuting and Lin Chen followed Xu Yun to the parking lot.

   After getting on the commercial vehicle.

  Xu Yun glanced at the time, thought for a moment, and suggested to Huang Yuting:

   "Professor Huang, it's getting late now. If we want to go to the Xichang base, we can only take the expressway. It will take several hours."

   "What do you think about this, let's find a nearby hotel to deal with for one night, and then take the train tomorrow?"

  There are not many flights from Chuncheng to Rongcheng. The flight Huang Yuting took was the first one to land, but the arrival time was still close to ten o'clock in the evening.

  Combining the time-consuming of picking up luggage and getting out of the station, the time is now approaching eleven o'clock in the evening, and it is obviously impossible to move by train.

   Fortunately, both the Academy of Sciences and the Xichang Satellite Launch Base have agreed hotels near the airport or the station, so there is no pressure to find a place to spend the night.

  Unexpectedly, Huang Yuting shook her head resolutely, and said to Xu Yun:

   "Forget about the hotel, Dr. Xu, let's take the high speed to the base—by the way, Dr. Xu, if you feel that you can't hold on, Xiaolin and I can go first."

  Xu Yun quickly waved his hand, and quickly denied:

   "Professor Huang, I don't have any problems. It's normal for me to stay up late at my age. It's nothing to pick up the plane."

   "If you want to leave now, Master Wei, then let's go."

  The Master Wei that Xu Yun mentioned was a middle-aged man in his early forties, named Wei Siming, a soldier who had retired from the farther west, and his hometown was in Eastern Shandong Province.

   Hear Xu Yun's instructions to set off.

   Wei Siming said yes quickly, and started the car.

  No words all the way.

   More than five hours have passed.

   Wei Siming's car arrived at the Xichang launch base safely.

   After inspection.

  Xu Yun first took Huang Yuting and Lin Chen to the guest house located in the logistics department, and helped them settle their luggage and pack some food, then Huang Yuting hurriedly dragged them to the laboratory.

  Students who were the launchers of the Xichang Launch Base in their previous life should know it.

  Xichang Satellite Launch Base mainly performs launch missions on weekdays. The commonly used research and development terminals are actually located in the Science and Technology Commission and the Space Administration, which are thousands of kilometers away from Xichang.

  However, this does not mean that the base itself has no research and development capabilities.

  In fact, due to historical reasons, almost all third-tier official institutions have independent scientific research capabilities.

  For example, Building No. 3 of the Xichang Launch Base.

   On the second floor of this seemingly ordinary building with the same name as a cat with no morals, there are sophisticated equipment that are completely different from its appearance:

  Anti-vibration and anti-overload component modules, axial escape sensors, calorimeters, regulators, and a buzzing supercomputer.

   There is even a small acid-base storage on the third floor of the building.

  According to Ge Tongyou's previous introduction to Xu Yun.

   In extreme cases.

  This laboratory has the ability to assemble a temporary communication satellite in four hours and launch it into the sky in six hours.

  When Xu Yun and Huang Yuting came to the second floor of the building, the laboratory was extremely lively, and it was impossible to tell that it was already four o'clock in the morning:

   "Prepare for position one, prepare for position one, this time try to keep the inclination within 0.005°!"

   "Attention, group B, attention, group B, there is something wrong with your calculation, the right side is not equal, please correct it again!"

   "Didn't the experts who designed the structure say they are on the way? Why haven't they arrived yet?"

   "Old Ma, how long will it take for your program to be finished?"

   "Hurry up, hurry up, finish it now!"

   "The last five minutes, can you make it?"

   "Don't worry, boss, I usually write novels, and I'm stuck updating for the last five minutes every day!"

   Facing the somewhat noisy laboratory, even Xu Yun was taken aback.

  The busy employees in this laboratory are generally between 30 and 50 years old, and they are not as "tragic" as the old academicians.

   But this kind of chattering sound was indeed beyond Xu Yun's perception.

  The research and development environment of the projects he has been in contact with are generally quiet. After all, data needs to be recorded and analyzed. If it is too noisy, it will definitely affect efficiency.

   Therefore, no matter how active most R&D teams are at the celebration party or outside the project, they are generally very quiet during the project.

  The atmosphere during the project is usually similar to the background tone of the Three-Body Problem TV series, except for someone playing the violin behind the scenes.

   The result was unexpected.

  These colleagues at the Xichang base are unique. They abruptly turned the laboratory into a vegetable market, and their voices are getting louder.

   Just when Xu Yun and Huang Yuting were a little dazed.

   Tongyou Ge, who was on their right, happened to catch a glimpse of them.

  Seeing him whispering something to the members around him, he hurried to the two of them and nodded to Xu Yun first:

   "Xiao Xu, you are back."

  Then he looked at Huang Yuting again, a trace of emotion appeared on his face, and he took the initiative to say:

   "Little girl, you are Lao Huang's daughter, right?"

  Huang Yuting hasn't heard anyone call her a little girl for a long time, but this discomfort with the title was soon dispelled by Ge Tongyou's follow-up of the word "Old Huang".

   She stared at Ge Tongyou and asked politely:

   "You know my dad?"

   Tongyou Ge nodded lightly:

   "Let me introduce myself. My name is Ge Tongyou. I work on instrument balance. I have cooperated with Lao Huang several times."

   "In addition, I served in the XX Navy a long, long time ago. The gravity gradiometer designed by Lao Huang in 2013 was installed on the ship of my old army, and the number is XXXX."

   Tongyou Ge reported the serial number of a ship, and Huang Yuting's eyes turned red instantly.

  The ship reported by Ge Tongyou is equipped with the first gravity gradiometer designed by Professor Huang Danian in China, and it will be in service for five years.

  In five years, it discovered a total of 48 large and small lurking equipment in the eastern waters of our country, which can be called a great contribution.

   In 2018, the life of the ship was limited, and the measurement equipment at that time was much more accurate than that in 2013, so the gravity gradiometer was decommissioned together with the ship.

   What made Huang Yuting even more unforgettable was that.

  The gravity gradiometer was completed in the same month as her master's graduation.

  At that time, Huang Danian specially applied for a procedure, and brought Huang Yuting into the R&D center of the Beihai Fleet, and Huang Yuting screwed on the last screw by herself.

  Now when Tongyou Ge mentioned the number of the ship, Huang Yuting's mood fluctuated somewhat.

   But soon.

  Huang Yuting quickly wiped the corners of her eyes, sniffed her nose twice, forced herself to return to normal, and said to Tongyou Ge:

   "Professor Ge, let's not talk about sentimental words, just tell me what I am going to do now."

  Tongyou Ge raised his eyelids to look at her, then nodded slightly:

   "Okay, come with me."

   Then he took Xu Yun and Huang Yuting for a few steps, and soon came to a table in the southeast corner of the laboratory.

  The area of ​​this table is about two square meters. There is a screen embedded on the table, and the structure diagram designed by Huang Yuting is impressively displayed on the screen.

  After coming to the table, Ge Tongyou pointed to the screen on the table and said:

   "Xiao Huang, we simulated your structure through the existing algorithm and found two relatively big problems."

  Huang Yuting gave a sign of all ears.

   Tongyou Ge quickly raised a finger and said:

   "The first question, the structure you designed is somewhat special, and it is somewhat different from the existing general ideas and Lao Huang's consistent style."

   "According to your design, this gravity gradiometer must have 3 arms and 6 accelerometers. In this way, how can it be balanced in the electrostatic field?"

   Hearing Ge Tongyou's words.

  Li Hua, the chief engineer who rushed to a few people just after asking questions, also nodded.

   Mentioned earlier.

  The principle of the gravity gradiometer is actually very simple:

   This thing is to place two accelerometers that measure acceleration at a certain distance, and use the difference between them to accurately deduce the gravity field.

   This difference is the so-called "gradient" in the gravity gradiometer.

  The measurement accuracy of the distance change of the sensitive mass on the accelerometer is required to be 60 nanometers in real time, which is about 1/1000th of the diameter of a human hair.

  The control of this precision must not rely on machinery, it needs to rely on the electrostatic field generated by the instrument.

for example.

  If you want to change the thickness of a hair at the nanometer level, you definitely can’t use mechanical tweezers to do it. You must apply an electric field or a magnetic field to achieve such a small level.

   But the problem is that currently most gravity gradiometers only have two arms and four accelerometers, but what Huang Yuting designed has three arms and six accelerometers, which is equivalent to one more 'axis'.

   In this way.

  Corresponding to other module design is very difficult.

But on the other hand.

   According to the calculation of Ge Tongyou et al.

  Huang Yuting's design can offset the vertical Fzz error structurally, which is a common problem of almost all gravity gradiometers at present—at least in China.

  This is also the reason why Xichang must have Huang Yuting present:

  They want to adopt this design, but they don't know how to optimize the structure because of non-specialists.

   "An electrostatic field."

  After listening to Ge Tongyou's question, Huang Yuting thought for a moment, then asked solemnly:

   "Professor Ge, is the electrostatic field you are talking about a three-dimensional numerical balance, or a classical electrostatic balance in the traditional sense?"

  Ge Tongyou and Li Hua looked at each other, and quickly said:

   "Of course the three-dimensional values ​​are equivalent. After all, the Pangu particle is not charged."

  Huang Yuting frowned suddenly.

  This is a hassle

To know.

  Huang Yuting and her project team sent a letter of intent for structural cooperation to the Xichang base as early as a month ago, and the time to produce results was actually earlier.

  At that time, they didn't know that Xu Yun had discovered dark matter, let alone that Xu Yun would use dark matter as a target in the measurement module.

  All her designs are aimed at particles that need to be transported through conductors—such as rubidium atoms of ultra-cold chains, etc.

   Since these particles are to be transported through conductors, the classical balance of three-digit equivalence is easy.

   According to Huang Yuting's design.

  As long as the three arms pass through a relatively special angle, the electrostatic balance in the conductor can be completed under any circumstances.

  Because the posture of the three arms is rather strange, somewhat resembling a [丄] character, so at that time Lin Chen also joked that their movements could be called the forgiveness of the goddess of dawn.

  This design can theoretically be applied to any particle, but what Huang Yuting never thought of is—

  Pangu particles don’t need to be channeled through conductors, they flicker out of thin air.

   This was beyond Huang Yuting's expectations.

  You can’t even think of this girl even if her brain hole is so big that there is a hole above her neck.

   Then Lin Chen beside Huang Yuting thought about it, raised his hand and asked:

   "Well, Professor Huang, what if we replace the target particles of the measurement module with other substances?"

  Tongyou Ge glanced at him when he heard the words, and quickly shook his head:

   "Then the measurement accuracy needs to be recalculated, and the whole difficulty is much more difficult than the electrostatic balance of three-dimensional numerical equivalence."

  Lin Chen opened his mouth, but he still didn't speak in the end.

really.

  If the Pangu particle is returned to other things, then it is equivalent to giving up the most critical and most advantageous link, and it will be much more difficult to deal with than it is now.

   And just when everyone was frowning.

  Xu Yun on the side suddenly spoke weakly:

   "Well, everyone, I have an idea, shall we add a lattice as a relay?"

Note:

  7.6K, is it not too much to ask for a monthly pass?