Spark

On the other hand, after handing over all the data at hand and dealing with Li Xiang's affairs, Chen Nian returned to his regular study life.

For several days in a row, he went to the library to study as usual after the small class, but he never met Li Xiang.

I finally met him in the restaurant, only to find out that this kid is busy receiving training in secrecy.

It is estimated that the one who taught him is still the same teacher as me.

Good guy, this time he has really become a full-time employee—he has already lived a life of receiving a salary before graduating.

Li Xiang also seems to be quite satisfied with this arrangement, after all, it does not delay his study, and he can enjoy the addiction of bragging.

The only trouble is that in order to boast like that, his professional knowledge has to be improved as soon as possible.

Therefore, he strongly asked Chen Nian to take time to make up extra lessons for him, saying that the family would pay him wages at double the market price.

This request was naturally rejected by Chen Nian - he couldn't arrange his own time, so how could he still spend it on him.

However, seeing Li Xiang's slightly disappointed expression, he still proposed an alternative.

Otherwise, I think you are not bad at all, and you are smart, so you don't need extra lessons.

However, you may need guidance in some key directions, and I can help you with this.

To put it simply... can I draw a key point for you?

According to Chen Nian's consideration, one-on-one make-up lessons are impossible, and it would be too time-consuming.

But if you just draw a key point and help Li Xiang find a more efficient and accurate learning method, it won't take up too much energy.

Hearing Chen Nian's words, Li Xiang was overjoyed.

Chen Nian, you are my brother, so it's up to you!

In fact, as Chen Nian said, his foundation is very solid, and what he lacks the most is guidance on key points——and the teachers of the university, especially some teachers of the Western Polytechnic University, to be honest In other words, the bureaucracy is relatively heavy, and students like him are difficult to approach.

Therefore, there is no way to make up for this one.

But now that Chen Nian is here, there is no need to worry.

You know, he is the only student who can skip classes at will and is praised by most teachers.

Coupled with the fact that he goes to the library every day, and the quizzes are often taken out as standard answers to explain, I believe he must be right.

Thinking of this, Li Xiang added another sentence:

In the future, if I have any questions that I don't understand, you can help me to mention them. As long as I get through the key points, I can understand them myself!

Okay, let's work together!

Chen Nian replied with a smile.

Then, as soon as he swallowed a mouthful of rice, Li Xiang sat down mysteriously.

Hey, Chen Nian——No, Brother Chen, I just have a question, can you help me with my staff?

What's the problem?

Chen Nian asked without raising his head.

He was concentrating on wrestling with a gnawing piece of chicken on the plate, eager to swallow it in one bite.

About the central lifting body.

Central lifting body? Why did you suddenly think of this topic?

Chen Nian asked suspiciously.

You know, the aerodynamics courses they are taking are still relatively basic, mainly focusing on the theoretical part, and they haven't even learned the airfoil.

The concept of the layout of the central lifting body was only produced in the era of the third-generation aircraft. Compared with other content they learned, it is relatively new, and it is not mentioned in general classes.

It's really strange that Li Xiang raised such a topic suddenly.

Hearing Chen Nian's question, Li Xiang smiled shyly and replied:

I just thought of it by chance... Didn't I discuss it with that spy before, and I think there are some things he said that make sense—ah, I can't tell you too much.

In short, I have read some information recently and think that the layout of the central lifting body is actually quite promising. Under the premise that the performance of the engine cannot be improved, using the layout of the central lifting body can greatly improve the maneuverability.

However, there are many problems that I don't know about the design of the central lifting body, so I would like to ask you, what direction should I start from?

Don't worry, I'm just interested in it, I don't have any other ideas.

Hearing Li Xiang's words, Chen Nian felt relieved.

Have another idea?

You dare.

They are all comrades within the system. If you make a mistake and see it, you will be caught or not, and you will be finished...

However, Chen Nian is somewhat familiar with the subject of the central lifting body.

Even without the help of the system, in his previous life, like Li Xiang, he checked some information out of interest.

So, after thinking for a moment, he said:

If you want to study topics related to the central lifting body, you must first understand what parameterization is. Now the shape parameters are mainly realized through CAD methods, such as NURBS curves are very typical.

Of course, there is also the quadratic curve method.

You have to understand these things before you can really understand the application of airframe design. Only then can you think about how to design the central lifting body.

Because the aerodynamic optimization involved in the central lifting body is more complicated than the conventional layout, and there are much more things to learn...

After listening to Chen Nian's words, Li Xiang nodded solemnly.

Understood, I'll look for some more cases first. Thank you Chen Nian, I feel that I have a little direction after talking with you, so I won't rummage like headless chickens like before.

Hi, it's all right.

Chen Nian waved his hand, swallowed the rest of the meal, then turned and went to the library.

But this time, Li Xiang also followed.

The two were doing their own things quietly. Chen Nian was still learning the basics of materials science, but Li Xiang had already started to follow the path Chen Nian had pointed him out before, looking at cases related to parametric design.

Until after ten o'clock in the evening, Chen Nian got up and wanted to leave. He called Li Xiang, but the latter waved his hand and said:

Let's go today, Chen Nian, I happened to see the key point, let's watch for half an hour...

Seeing Li Xiang's obsessed face, Chen Nian stopped bothering him, but walked out of the library by himself after saying goodbye.

On the way to his residence, Chen Nian opened the system interface. Judging from the display on the interface, the number of his source points has accumulated to 0.46 points.

One step closer to the goal...

Chen Nian smiled in satisfaction, and was about to close the interface, but at this moment, the number 0.46 jumped suddenly, and instantly changed to 0.47!

What's the situation? Does walking count as learning?

Under normal circumstances, the growth of the source point will end when the learning action is over, unless I have been thinking all the time and have some new insights, occasionally there will be delays in settlement.

But he was sure that he hadn't thought about anything just now!

what's going on?

Wait... Could it be Li Xiang?

Could it be that his study is also counted on his head?

Without any hesitation, Chen Nian turned around and returned to the library. Li Xiang, who was sitting in the seat, stood up excitedly when he saw Chen Nian.

Hey, Chen Nian, come here quickly, I just had some new ideas and was about to ask you, but you came back unexpectedly...

What new idea?

Chen Nian asked impatiently.

It's the parametric design problem you mentioned. I read a case where a quadratic curve was used to solve the layout optimization of the lift body, and then I think the quadratic curve is flawed.

The process of solving the coordinates of the intersection point of the tangent at the end of the quadratic curve is too cumbersome, and the curve with discontinuous second derivatives needs to be processed in sections.

I was wondering if it would be easier to solve it with the proxy model method.

I tried it just now, and it seems to be really feasible!

Chen Nian, come and take a look!

Chen Nian took his draft paper, and at a glance, he understood it completely.

This is actually not a big breakthrough. At best, it just optimizes a part of the modeling algorithm, not even enough for a paper.

However, if we continue to diverge from this method, in the future, when computer technology is fully developed, and then new tools such as genetic algorithms and machine learning are introduced, the potential of this small optimization can be brought into play.

Is this the reason why the system issued the source?

Chen Nian's heart moved, and he vaguely realized something.

If this is the case, it probably means that my previous understanding of the system rules was incomplete.

The so-called source does not come from the learning process, but from knowledge increment.

As long as this increment is self-initiated, it can be rewarded.

Doesn't that mean that my real direction is actually a top-level designer?

The correct way of working is not to parse out all the modules, but to focus on inspiring and breakthrough technologies to realize the self-circulation of the source...

Good guy, no wonder I always feel that the source point is not enough, and the relationship is that the method is not right!

Fortunately, both the engine and the airframe design are inspiring, and sooner or later new achievements will be brought back to the source, otherwise it will be a big loss....