Erheng Bihuang was engaged in the military and production, so he looked at it and asked the general, state, what are the requirements for materials when building a large aircraft? "

When the chief engineer faced the standing committee and the executive vice premier. There is still a little psychological pressure, after all, such a big leader is really rare. But the time for these words is their profession. Naturally, there will be no stage fright. "The metal and non-metal materials used in large passenger planes were developed and transported ten years ago. They have been basically supplied by domestic supporting facilities. When large passenger planes are being developed today, the situation is somewhat different from that of the time. After the advanced level is further integrated, the materials need to pass the quality control verification according to the airworthiness standards. There are many types of materials used in an aircraft, and all certifications require one process. However, there is a different situation. It is not necessary to limit the source of all materials to domestic . And there are channels to purchase materials from abroad. In this way, the supply of materials for civil aircrafts in China can be carried out in an orderly manner. On the one hand, the quality of domestic materials will be stepped up to pass certification. On the other hand, some materials can be purchased from abroad first. .

The composite components used on large passenger planes are not only a kind of material, but also a kind of structure. The range of composite materials used on civil aircraft has undergone a gradual increase process, so it is used on our country’s large passenger aircraft. Some composite materials will be used. To gain experience in structural design and materials, in order to continuously expand its usage in subsequent models to reduce the weight of the body structure

"Oh, that's how Fan Hyung nodded.

However, the accompanying reporters were very active in asking questions. A female CCTV reporter ran over. Ask the chief engineer, "I heard that you told college students about wearing padded jackets on airplanes, can you talk to our audience?

Fan Wubing heard his voice very familiar. Turned his head and took a look. It is the reporter Lan Lan who knows Cuiqi very well on CCTV. Could not help but smile at her. I didn't expect people to concentrate on interviewing the chief engineer, so I didn't even look at him. It's a little bit I will be sincere with the bright moon. However, Mingyue illuminates the feeling of the ditch, and couldn't help touching his nose, and laughed hey.

The chief engineer listened to Lanlan's question. I felt that it was necessary to popularize science, so I smiled and said, "Oh. There is such a thing. People need to wear padded jackets when they are cold. The cruising altitude of large passenger planes is generally at an altitude of 9,000 to 10,000 meters. Atmospheric. The average temperature in the troposphere is below minus fifty degrees, which is the so-called high altitude. Because the entire fuselage of a large passenger aircraft is basically one cabin, so in the design, it is necessary to put on a cotton jacket on the fuselage. The cabin keeps warm."

Lan Lan asked, "So what is this padded jacket made of? Where is it placed?.

The chief engineer replied, "The quilted jacket on the fuselage of the aircraft is obviously not made of real cotton. Because the cotton is easy to absorb water and mold after a long time. It is old and insects. Therefore, we chose glass made of inorganic glass. Cotton is a raw material to keep warm, as an inorganic substance. This kind of thing is very stable, not only heat-insulating and shock-proof, but also very light. Therefore, the fuselage of the aircraft uses a cotton quilt stuffed with glass wool, which is laid on the fuselage. In the space between the leather and the decorative panel in the cabin."

He said again. "The entire cabin section and cargo section of the fuselage are wrapped with this kind of glass wool. It plays the role of sound insulation and warmth. The floor of the cabin, because the cargo compartment is underneath. It is also in the pressurized heat preservation area, so under normal conditions There is no need for special insulation. But in the landing gear compartment, the cabin floor is open to the atmosphere, and it is at low temperature at high altitude. Therefore, the cabin floor at the landing gear compartment is covered with resistance heating wires, which are energized in the air Keep warm to prevent passengers from freezing their feet."

Lan Lan asked again. "The anti-noise design of large aircraft is not a blank in China's design field. Can China overcome the minefield of this technology?.

For this. The chief engineer seems to be more solemn to the question, "I can say it responsibly. No. In the 1980s, the large passenger aircraft developed in China used glass wool quilts for sound insulation and heat preservation, so that the aircraft was in flight. The noise in the cabin has reached the level of advanced international aircraft. Passengers experience very low noise during the flight. The crew can talk to each other at will. This is what I experienced firsthand when I took a flight test on Yunshi. I felt that I was travelling in various foreign countries. The feeling of a passenger plane flying around the earth is the same. And now our material technology and motivation technology have made great progress, so this aspect will only get better and better. After the success of the big plane, it will become the most comfortable and safe in the world. One of the models."

"Thank you very much for your cooperation. Finally, I want to ask a very confusing question. Is the landing gear of a large aircraft also special? Lanbianer thanked the chief engineer. He asked curiously.

"Well. This is indeed a very good question.

When a large passenger plane takes off with 6 weight gains. The number of wheels needs to be increased to disperse the pressure of the aircraft on the runway, so that large aircraft can take off and land without requiring a special runway. Install a wheel under each landing gear pillar. Passenger aircraft with a little more passengers. Double the number of wheels and install two wheels under the main landing gear pillar. When the total take-off weight of the aircraft reaches more than 100 tons, The number of wheels needs to be further doubled. In terms of structure, one is installed under the landing gear struts. The frame, and four wheels are installed on the frame."

about this point. The chief engineer also invited everyone to visit the prototype model and gave some explanations. For example, on giant passenger planes like Boeing Power and Airbus Brain Patrol. It is not only necessary to increase the wheels to disperse the ground pressure. It is also necessary to increase the support of the buffer to absorb the impact energy of the body at 6 o'clock. The method adopted at this time is to increase the number of pillars of the main landing gear. Not only a pair of main landing gear is installed on the lower surface of the wing. And a pair of landing gear pillars are added to the abdomen of the fuselage. Under the buffer struts of the wing landing gear and the belly landing gear, multiple wheels are installed on the frame.

Frame-type landing gear is also an important basic design type for large passenger aircraft. Similarly, domestically, the design of frame-type landing gear has been successfully implemented during the flight test flight of Yun-10 in the 1980s.

In the test flight, Yunshi has passed various tests from the Shanghai Airport at zero altitude to the Tibet Gongga Airport, the highest plateau airport in the world, and the actual take-off and landing of airports under different conditions in Northland and Southern Xinjiang.

In the subsequent international exchanges, China also undertook the design task of modifying the four-wheel landing gear of foreign models. The results were praised by foreign aircraft manufacturers. therefore. Frame type landing gear for large passenger aircraft. It is a mastered technology for domestic aviation design business. one. Positions already captured.

"Just now you told the story that our country modified the landing gear abroad. Which country is it for? The United States? When, can you talk about it in detail?" The topic of Lanxian should be more critical. So I asked another question.

Engineer Lan naturally wouldn't be stingy to say a few more words in order to cheer up the army, so he explained. "Last. In the 1980s, when China assembled a U.S. passenger aircraft, the main landing gear of the aircraft used two wheels, and the pressure on the ground exceeded the endurance of some airport runways in China. Therefore, the Civil Aviation Administration of China formally requested that the U.S. passenger aircraft be changed to Four-wheel landing gear is used. That is to say, a frame-type landing gear should be installed at the lower end of the undercarriage of the landing gear. The project is a cooperation between China and the United States. The Chinese side is the main one. After the Chinese side has completed the design, it has been praised by the United States. But this modification The project was not implemented on the aircraft due to the cancellation of the modification requirements by the Civil Aviation Administration of China. Despite this, the design of the frame-type landing gear in China has been recognized by the relevant U.S. design agencies."

After listening to the chief engineer's words. Fan Wubing couldn't help but sneered, "Civil Aviation Administration. Hey."

Due to the disgraceful role played by the General Administration of Civil Aviation in the process of dismantling the Yun-10 project at that time, Fan Wubing now resents them a lot, and Fan Wubing also believes that it should be very reasonable to say that they are in the same line. Therefore, he has no doubt that there is still very serious bureaucracy and police style in the current Civil Aviation Administration. After all, the annual purchase of large aircraft is clearly seen there.

It's even more jealous. There is no airport and ground construction. Since there is no strict supervision mechanism, they basically say that they need to spend as much as they need to spend. The oil and water in it are even more outrageous, one. Although the Civil Aviation Administration of China does not show up, but the loopholes in it are surprisingly large.

Fan Wubing once thought of using the momentum to stir up the fat of the Civil Aviation Administration. It is a pity that now his father is still in an unstable situation, if he is re-elected successfully this time. It does have the ability to operate it.

The CAAC’s problem has been resolved, which will be of great help for itself in the future vigorously developing large aircraft manufacturing and civil aviation "transportation."

Of course, the most important thing is that Fan Wubiao's resentment towards them is relatively serious.

Especially when he visited the overall blueprint for the design of the large aircraft project this time, Fan Wuyi came across. Originally, so many key technologies were implemented in the Yunshi project team, so the estimated design time was greatly shortened. This alone can make Fan Wubing save billions in research funding and more than 10 billion yuan in trial production costs.

If Yun Ten didn't get rid of the horse back then, would it be necessary for Fan Wuyi to invest hundreds of billions of funds to operate it?

Thinking of this, the question. Mr. Fan's heart is naturally quite uneasy. If he really allows himself to find this opportunity, he doesn't mind tidying up these idiots who will only feed themselves.