Research starts with PhD students

Chapter 107 Zhang Shuo: It’s obvious, isn’t it? The gap between ordinary people and geniuses!

Power Group, Office of Team 2.

Team leader Zhou Bing had just finished a complicated calculation problem. He had been working for too long and felt very tired. He quickly stood up and stretched.

He turned his head and saw Zhang Shuo, and discovered that Zhang Shuo was staring at the computer screen with his eyes motionless, as if he was... in a daze?
"Too difficult?"

Zhou Bing pondered, "He may be a genius in computational mathematics research, but he is still too young and has too little experience in numerical calculations."

Computational mathematics involves substituting numerical methods into calculations, so experience is still very important.

In fact, it is the same as solving ordinary equations. If you have more experience in solving equations and look at the type of equation, you will roughly know how to solve it.

This will definitely be much faster.

Some people may be very outstanding in research, but their ability to substitute numerical values ​​into calculations may be poor, or it is because they have too little experience in doing these jobs.

Zhou Bing walked over and asked with a smile, "Professor Zhang Shuo, how is it?"

"Team Leader Zhou, you're welcome. Just call me Zhang Shuo."

Zhang Shuo corrected the address, picked up the draft book on the table and handed it to Zhou Bing, "I'm done."

"Oh ah?"

Zhou Bing was obviously stunned for a moment.

He took the draft book and took a look at it. The content was written very clearly, with the calculation result written below each calculation problem.

He lowered his head and noticed that there was a pile of calculation papers on the table.

Each one is filled with various mathematical symbols, which is dazzling to look at.

Zhou Bing couldn't help but ask, "Are you done?"

"what happened?"

Zhang Shuo asked doubtfully.

"Nothing, nothing." Zhou Bing said and couldn't help but take a deep breath.

The others also looked over with surprise.

They were not familiar with Zhang Shuo, and did not say much. A professor named Zhang Zhihui came up to Zhou Bing and whispered, "You calculated so quickly, is there any problem?"

"These are too complicated. I can't finish them in one day..."

"Let's take a look together."

Zhou Bing didn't say anything, but asked Zhang Zhihui to help with the calculations.

Verification is very necessary.

Calculations completed by others also need to be verified, mainly because the calculations are very difficult and require a high level of accuracy.

Even after submission, each group needs to conduct a cross-check again.

Calculate once and check twice to ensure the accuracy of the result.

Zhou Bing and Zhang Zhihui were also very curious, and they wanted to verify the results to see the situation.

Mainly because Zhang Shuo finished it too quickly.

Zhang Zhihui was not joking when he said that he needed one day to finish the task. The calculations on the paper might not seem like much, but each one was extremely difficult and required careful study and analysis to ensure a more accurate result.

Sometimes, it is normal to spend one or two hours to complete a calculation.

In just one hour, Zhang Shuo completed all the calculations, which was really incredible.

During the verification process, they were surprised throughout.

Later, Zhang Zhihui fell silent. He began to look at Zhang Shuo frequently, unable to understand why the other party could complete the calculation so quickly and so accurately.

This is so genius!

Zhou Bing was in a good mood. He was the team leader and was worried about too much calculation work assigned to the group. As a result, a computational mathematics genius was assigned to the group and he completed a day's work in an hour. Moreover, according to the verification results, the accuracy was fully up to standard.

After all the calculations were completed, he whispered to Zhang Zhihui, "You want a day for all this? Look, it can be done in an hour!"

"You both have the surname Zhang, why is there such a big difference?"

"You can do it?!"

Zhang Zhihui retorted, and then sighed, "You really can't judge a hero by his age. He can complete the general algorithm of second-order PDE, and his computational mathematics level is indeed high enough!"

After Zhou Bing confirmed the result, he said to Zhang Shuo cheerfully, "There is no problem with the calculation. You can take a rest today. It's only your first day here. I guess you will be busy for several days."

"You can go to the dormitory first, or you can take a walk around the base..."

Zhang Shuo nodded and asked, "Team Leader Zhou, I want to find some data on rocket engines and power. Can I apply for it?"

"What do you want this data for?" Zhou Bing asked puzzledly.

"I want to study the problem of Pogo vibration caused by the jet power in the experiment and see if I can find something by analyzing the data."

Zhang Shuo said frankly.

After hearing this, Zhou Bing pursed his lips tightly. It is the job of rocket experts to study the Pogo vibration problem through experimental data.

After studying previous data, rocket structure, and test firing experiments, they determined that the Pogo vibration problem should be reduced by adjusting the nozzle structure.

Zhang Shuo also said that he wanted to do research in this area.

Zhou Bing thought about it and nodded, "Okay, since you are interested, I will help you apply for it. It shouldn't be a problem."...

The application was approved quickly.

Zhang Shuo signed a confidentiality agreement and got a lot of data.

In fact, the confidentiality of the data is not high. It is just a bunch of engine indicators, past experimental data, and the structure and detection data of the injection nozzle, etc.

The truly confidential technologies are all inside the engine, and nothing can be seen from the data.

Technically speaking, the implementation method is the core.

Just like a car engine, after a series of tests, a lot of data is obtained. The data can only show the performance of the engine, but the way the engine achieves its performance, its internal structure and technology are the key.

After Zhang Shuo got the data, he started to do research seriously. He spent two scientific research coins without hesitation and immediately found the starting point for the research.

POGO vibration is a longitudinally coupled vibration.

Longitudinal can be understood as up and down vibration. Imagine a person being pushed forward by a thrust. The thrust lasts for one second, then stops, lasts for another second, and then stops again.

If the duration is reduced ten or a hundred times, unstable forward vibration will occur.

The POGO vibration of a rocket is very similar, but the mechanism of POGO vibration is very complicated. It is not simply due to external push, but is related to the internal engine layout, nozzle conditions, thruster piping system, etc. It also involves vibration problems caused by the similarity of internal and external frequencies.

If we only look for problems from the perspective of injection power, the most likely possibility is that during the hydraulic injection process, a resonance-like phenomenon occurs between two positions, which greatly increases the vibration of the POGO.

Therefore, the research direction is to find the location where resonance-like phenomena occur.

After Zhang Shuo found the starting point, he listed the correlations of each part separately, and then analyzed them through continuous calculations and comparisons.

He was busy until nine o'clock in the evening, and the task progress was increased to '15%'.

On the morning of the next day, the power group carried out calculation summary and secondary verification work.

Zhou Bing took Zhang Zhihui and Zhang Shuo to participate in the calculation summary work. On the one hand, they had to hand in the calculations completed yesterday, and on the other hand, they had to cross-check with other groups to ensure the accuracy of the calculations.

Cross-validation between groups was performed by random assignment.

Zhou Bing was assigned a part of the calculation results, and he verified them together with Zhang Zhihui and Zhang Shuo.

Zhang Shuo was only assigned a few verification tasks, and he completed all of them in more than 20 minutes, and also found a problem of "inaccurate result area".

In this case, you need to call back and recalculate.

The calculation work is not done by those who are more capable, and each group is assigned a fixed amount of work. After they complete the cross-calculation work, they can go back to the office to continue the calculation work.

When it comes to computing work within a group, those who are more capable will get more work.

Zhang Shuo took the initiative to share some difficult calculations, which made everyone in the group feel good about him. Their work tasks became relatively simpler and their efficiency was greatly improved.

At the same time, Zhang Shuo was also happy to do some difficult calculations.

He found that after completing these numerical calculations, his numerical calculation ability was greatly improved. Every time he solved a calculation problem, the understanding feedback brought by the system task also made him understand the calculation process more thoroughly.

This is a direct increase in numerical computing power, and the more you do, the more you increase.

Later, when I saw some similar complex equations, I knew how to perform numerical calculations without even having to consider them.

Zhou Bin’s understanding is not wrong.

When it comes to working with numerical equations, experience is indeed important.

After Zhang Shuo did a lot of difficult calculations, his calculation speed became faster and faster. By the third day, he only spent more than half an hour to complete all the calculation work assigned to him.

In contrast, Zhang Zhihui had just completed the calculation of a complex equation.

This super-fast calculation speed made Zhang Zhihui, who wanted to compete with him, feel desperate.

It’s like two people taking an exam at the same time. One of them just glances at the question and writes down the answer directly, while the other is still seriously thinking about how to solve the question. The gap between them is really too big.

Others were also confused, "How did you calculate so quickly?"

"You've finished it in just over half an hour? It feels like I'm solving a linear equation with two variables... Isn't that too outrageous?"

Zhang Shuo pointed to one of the partial differential equations and explained, "It's actually very simple. Look at this equation. First, do Fourier discrete analysis on the computer. After obtaining the discretized equation system, observe the situation of the equation system..."

"Obviously, the parameters of this equation are too large. Let's start from here..."

"At this point, it's obvious that substituting the operator will simplify it..."

"Then, we can take the value and try to substitute it into the calculation..."

Zhou Bing, Zhang Zhihui, and the other two listened patiently and tried to understand, and found that what Zhang Shuo said did make sense...

What a P!
"It's obvious what it is!"

"If you don't tell us, we really won't be able to tell, and it will take a long time to analyze..."

Zhou Bing pulled Zhang Zhihui aside and said something very philosophical, "We don't quite understand why he kept saying 'obviously' when he was speaking."

"But, on the other hand, he probably doesn't quite understand why we can't see such an obvious problem."

"This is the gap between ordinary people and geniuses!"

Zhang Zhihui nodded in agreement, "You could say that this is the difference between a genius and an ordinary person."

"Is there any difference?" Zhou Bing wondered.

Zhang Zhihui said seriously, "The difference is that the genius is put in front, which makes me feel as if there is a gap between the genius and me, and I feel much more comfortable..."

(End of this chapter)