The stealth capability of a stealth fighter, of course, does not refer to optical stealth, but to preventing detection by radar.
When the waves emitted by the radar are transmitted into the air, if there are no objects in the sky, these radar waves will continue to propagate out, and the radar will not detect any abnormalities. However, if there are objects in the sky, the radar waves will encounter obstacles and then bounce back.
It comes back and is received by the radar. The radar then processes the received data, which involves a radar reflective surface. The larger the reflective surface, the easier it is to be detected, and vice versa.
So if the radar detects birds, because the birds are small enough, the probability of being detected by the radar is relatively small. Of course, even if they are detected, they will be ignored by the computer algorithm. Otherwise, every time they fly over
Just a bird, the radar base will beep, and the staff at the radar base will obviously suffer.
For aircraft such as fighter jets, this is not the case. Because the aircraft is large and has a large reflective surface, various methods need to be adopted to reduce the radar waves reflected by it. One method is to design the shape of the fuselage to reduce
The radar reflective surface and the use of stealth paint are very important as they complement each other. Even the stealth paint needs to be coordinated according to the shape of the fuselage.
Professor Zhang Heng naturally knows these things very well.
But now, he just used this partial differential equation to slightly optimize the layout of the stealth paint, and the result was that he suddenly increased the wave absorption capacity by 15%?
Although, it is just a simple design and cannot represent the real situation. The method is not very rigorous, and the model is also very ideal. There is no specific analysis. It is just an airplane model, which is probably simpler than an origami airplane.
However, this wave-absorbing capacity is directly increased by 15%, but it is genuine. Even if it is really made, the wave-absorbing capacity is estimated to be about 10%.
He couldn't help but observe carefully again, looking at the radar wave absorption process on the simulation software.
Then, he took out a pen and paper and began to calculate.
As an expert on the layout of stealth coatings on fighter jets, the J-20 chief engineer always asked for his advice when designing the appearance of the J-20, and his ability in mathematics is not bad at all.
Now, he needs to use mathematics to directly calculate the principle of improving the wave absorption efficiency.
Soon, he calculated it.
"So that's it!"
There was wonderment in his eyes.
"It's like the principle of thin film interference! It's just closer to the essence, and...a few layers deeper."
The principle of thin film interference is used in many places. The most common one is anti-reflection coating. For example, there is anti-reflection coating on glasses lenses. It can enhance reflection or reduce reflection by using the interference of light.
For radar waves, it can reduce the reflection of radar waves through this interference, thereby improving the wave absorption efficiency.
But it’s not just that. If it’s just the thin film interference principle, it’s obviously not worth mentioning. But the key thing is that it can change the layout of the coating to make the interference and diffraction of radar waves on the coating more intense, thus leading to interference.
The cancellation and diffraction cancellation effects are stronger, thereby reducing wave reflection to a greater extent. At the same time, a "dark room" can be formed between the coatings to prevent radar waves from being reflected.
Probably: Radar waves? Humph, it must be said that it never comes back!
After clarifying how to use this theory, Zhang Heng's mind suddenly came to various methods of using it to improve the performance of absorbing materials. The more he thought about it, the things he thought of were not limited to absorbing materials.
It lies in the design of the body shape.
The selection and layout of absorbing materials need to be determined based on the shape of the fuselage, because the shape of the fuselage serves the launch performance of the fighter jet. Faced with the overall maneuverability of the fighter jet, the stealth performance obviously needs to be compromised.
But now according to the guidance of this theory, they can grasp it with both hands.
In this way, the stealth performance of their fighter jets can be greatly improved!
Thinking of this, he slapped the table.
"Harm! Why did you show up now?"
Ma Gaoliang and Shen Zhi, who had been waiting for his reply, were startled by his sudden slap on the table.
What happened?
Why slap the table?
Shen Zhi stepped forward and asked: "Professor Zhang, what's wrong? What just appeared now?"
Zhang Heng shook his head and sighed: "I say it's too late for this theory to appear."
Ma Gaoliang was also confused, "What's the problem with this?"
Zhang Heng looked helpless and said: "If this thing had appeared a few years earlier, the stealth capabilities of our J-35 and J-20 would have been improved a lot. It appears a little late now. The J-35 will appear this month."
It seems that we will have a test flight at the end of the month.”
Hearing this, Ma Gaoliang breathed a sigh of relief. He thought something was wrong, but when he heard Professor Zhang Heng's regretful tone, it was as if something big was about to happen.
But now it seems that this thing obviously has a very big effect, otherwise Professor Zhang Heng would not be so excited!
I remembered that Lin Xiao was looking for something from him the day before yesterday. Now it seems that as long as Lin Xiao looks for him, something good will definitely happen.
Then he smiled and said: "It's okay. Although it appeared a little late, it's better than nothing!"
"What's more, it's not like we won't improve in the future. When we improve the J-20 in the future, we can use this theory again."
Professor Zhang Heng smiled and said, "That's true!"
"In addition, I estimate that this new theory can also be used to enhance the detection performance of our military radar. This principle can be used to enhance the absorption and reflection capabilities of radar waves. In addition, it has many other effects. I think, in the future,
All can be used.”
Speaking of this, Zhang Heng suddenly remembered something: "Hey! By the way, who came up with this partial differential equation? Is it a foreigner? Then we have to step up. I'm afraid it will be long before foreigners get this theory.
It has just started to be used, we can’t lag too far behind.”
Hearing what Zhang Heng said, Shen Zhi also turned to look at Ma Gaoliang and asked: "Director Ma, yes, who developed this thing? Was it made by foreigners?"
Speaking of this, Ma Gaoliang laughed: "This is a theory created by us Chinese! So don't worry, foreigners don't know it now! But now..."
"Chinese?" Zhang Heng's eyes suddenly lit up: "Who is this kind of talent? We need to call him over. It will be very helpful for our research!"
"Forget it, just give me his contact information and I'll call him directly."
When the time comes, ask directly, do you want to study fighter jets? I guess most domestic scientific researchers will be willing, right?
After hearing Zhang Heng's words, Ma Gaoliang spread his hands helplessly: "Professor Zhang, forget it. I'm afraid that I will be poached by him. Director Shen won't cause trouble for me?"
"You want to poach me?" Zhang Heng suddenly became more interested: "It seems that he is also an old guy. Tell me, don't show off, maybe he is an acquaintance of mine."
Ma Gaoliang said with a smile: "He is not an old guy, he is still a young man. The combined age of the two of them is probably not as high as one of us alone."
"Okay, I won't be too pretentious. This was done by Professor Lin Xiao. I was entrusted by Professor Lin Xiao. I'm here to get your opinions. Professor Zhang Heng, what do you think about the role of this theory? Do we need to keep this theory secret?"
Hearing what Ma Gaoliang said, Zhang Heng couldn't help but be stunned.
Professor Lin Xiao?
And what Ma Gaoliang meant just now, this Professor Lin Xiao is probably only in his twenties, so obviously, there is only the most famous Professor Lin Xiao recently.
It turns out that this partial differential equation was actually created by Lin Xiao!
Although it shocked him, he had to say "no wonder".
Although he did not see the derivation process of this system of partial differential equations, he also knew that it was very troublesome to derive it.
But the young professor named Lin Xiao definitely has a chance to deduce it.
When Shen Zhi next to him heard this name, he also showed an expression of sudden realization. Only a genius like that could deduce such an important theory.
However, the question raised by Ma Gaoliang is very thought-provoking.
It seems that this is to keep this theory a secret?
It is relatively difficult to maintain confidentiality in theory, because this requires first making demands on the person who proposed the theory.
Those theories that need to be kept secret obviously play a very important role. For the proposer, if such a theory is made public, he can gain huge fame and fortune.
Therefore, if the proposer of the theory has no intention of keeping it secret, he will naturally publish it.
This theory is obviously very important. This system of partial differential equations completely analyzes the laws of interference and diffraction. This alone can directly make a person famous throughout his life.
Even for an already famous world-class scientist like Lin Xiao, if this thing is made public, it will also allow him to reach a higher level and break through from a world-class three-star to a world-class five-star.
But now that Ma Gaoliang can ask them this question, this undoubtedly shows that Lin Xiao is willing to keep this theory secret.
Thinking of this, Zhang Heng secretly sighed in his heart that it was a great blessing for their country that such a talented young man could still have such a kind heart.
He also secretly made a decision in his heart. Although an old guy like him cannot deduce such a top theory, he must do his best in the future to maximize the role of this theory and not let down Lin Xiao. expect.
Then, he solemnly said: "Of course, this theory is worth keeping secret! As long as Professor Lin Xiao has no objection, I will definitely raise my hands to express my approval."
Seeing Professor Zhang Heng being so serious, Ma Gaoliang nodded solemnly, and then took out a piece of paper from his briefcase, which was an application form for confidentiality protection.
This application form will be submitted to the top leadership, who will approve it and keep it confidential. In the future, only some qualified scientists in their country will be able to use this set of wave coherence superposition equations.
Professor Zhang Heng quickly filled out the application form. He applied as a proposer. In the reason for the application, he used many words he could think of to describe the significance of this theory, etc. "
"Very important", "The key to leading", "The basis for the rise of important science and technology", etc.
All in all, it is almost impossible to say that this theory is rare in the world.
After filling out the application form, Ma Gaoliang put it away and said, "Then, please keep this matter confidential."
Shen Zhi laughed: "Director Ma, just rest assured. All our comrades in Chengfei are extremely confidential, not to mention that only a few of us know about it now."
"That's good." Ma Gaoliang smiled and nodded.
Zhang Heng added: "If you want to show it to others in the future, don't write down the argument process. Just write the system of equations on it. Let Professor Lin Xiao write an annotation to explain what the numbers in it represent. This way
That’s enough, the confidentiality will be better.”
After hearing Zhang Heng's suggestion, Ma Gaodian nodded, "That's the truth."
"Well, that's it."
"Okay, then I won't disturb Professor Zhang."
Ma Gaoliang said with a smile, and then left the laboratory with Shen Zhi.
"Stay and sit for a while?" Shen Zhi asked.
Ma Gaoliang waved his hand: "No, it's time for me to go."
"Okay." Shen Zhi nodded, and then said: "By the way, from the 10th to the 15th of next month, at the Zhuhai Air Show, our J-20 will have brand-new equipment. By then, you, the director of the Science and Technology Bureau, will
But you must come and visit.”
"J-20? Brand new equipment?"
Shen Zhi chuckled: "You should know this news. The Aeronautical Materials Institute has developed a super material two years ago that can be used on engine fan blades. I can only say that it is a great batch. I don't know yet.
Who did the research? Otherwise, we aviation people would have to thank him very much."
Hearing Shen Zhi talk about this, Ma Gaoliang laughed: "Oh, you said this, okay, when the opportunity comes, I will definitely go."
"Okay." Shen Zhi made an OK gesture, "Then see you then."
Ma Gaoliang said no more, said goodbye, and turned to leave.
And in his mind, he also recalled what he had heard recently about the J-20.
The turbofan 15 engine they used now has a thrust-to-weight ratio as high as 13.6!
This is definitely the best thrust-to-weight ratio among all fighter engines in the world.
And all of this is the titanium-aluminum alloy material developed by Lin Xiao.
This is a secret, Shen Zhi doesn't know it, but he does know it.
This is nearly 3 times higher than the 10.87 thrust-to-weight ratio of the previous turbofan 15 that used old materials!
Therefore, at this air show, their J-20 is ready to shock the world.
There was a slight feeling of pride in his heart, and then he stepped faster and applied for confidentiality protection for the theory in his hand as soon as possible so that it could play a greater role.
Then he will not live up to Professor Lin Xiao’s expectations.
There is one more chapter, which I will post later, as there are a lot of things going on today.
