Chapter 1126 Interview

Erheng Bihuang was engaged in military production, so he took a quick look and asked the president, what are the material requirements when building a large aircraft? "

When the chief engineer faces the Standing Committee and the Executive Vice Premier. There is still a bit of psychological pressure, after all, such a big leader is really rare. But it’s time to talk about their profession. Naturally, I won’t have stage fright. "The metal and non-metallic materials used in large passenger aircraft were basically supplied by domestic supporting equipment when they were developed in the past. When developing large passenger aircraft today, the situation is somewhat different from that of the time. First of all, the development of civil aircraft in our country is different from that of the world. After further integration with the advanced level, materials need to pass quality control verification according to airworthiness standards. There are many types of materials used in an aircraft, and it requires a process to complete the certification. In another situation, it is not necessary to limit the source of materials to China. In this way, the supply of materials for my country's civil aircraft can be carried out in an orderly manner, and the quality of domestic materials can be improved. On the other hand, some materials can be purchased from abroad. .

The composite components used on large passenger aircraft are both a material and a structure. The scope of use of composite materials on civil aircraft has experienced a gradual increase, so it is used on large passenger aircraft in our country. Parts will be made of composite materials. To gain experience in structural design and materials, so as to continuously expand their use in subsequent models to reduce the weight of the body structure

"Oh, that's right. Fan Heng nodded.

On the other hand, the accompanying reporters were very active in asking questions. A female reporter from CCTV ran over. I asked the chief engineer, "I heard that you told college students about wearing cotton-padded jackets on airplanes. Can you tell us about it for our audience?"

The voice sounded familiar to Fan Wubing. Turn around and look. It was Lan Lan, the reporter who knew Cui Qi very well from CCTV. He couldn't help but smile at her. Unexpectedly, he was so focused on interviewing the chief engineer that he didn't look at him at all. It's really a bit like I will sincerely share my heart with the bright moon. However, I felt like the bright moon was shining in the ditch. I couldn't help but touch my nose and laughed.

The chief engineer listened to Lanlan's question. I felt that it was necessary to popularize science, so I smiled and said, "Oh. It does happen. People need to wear cotton-padded jackets when they are cold. The cruising altitude of large passenger aircraft is generally between 9,000 and 10,000 meters. The atmosphere is The average temperature in the troposphere is below minus 50 degrees. As the saying goes, it is not cold at high places. Since the entire fuselage of a large passenger aircraft is basically one, the cabin, so in terms of design, it is necessary to put a cotton jacket on the fuselage. The cabin is warm.”

Lanlan asked, "So what is this cotton-padded jacket made of? Where is it placed?"

The chief engineer replied, "The cotton jacket on the aircraft fuselage is obviously not made of real cotton. Because after a long time, cotton easily absorbs water and grows mold. It gets old and gets insects. Therefore, we chose glass made of inorganic glass. Cotton is used as a raw material to keep warm. As an inorganic substance, this material is very stable, insulating and shock-proof, and is very light. Therefore, the aircraft fuselage uses a quilt stuffed with glass wool, which is laid on the fuselage cover. in the space between the leather and cabin trim panels.

"

he said again. "The entire passenger cabin section and cargo compartment section of the fuselage are wrapped with this glass wool quilt. It plays the role of sound insulation and heat preservation. The floor of the passenger cabin, because there is a cargo compartment below. It is also in a pressurized insulation area, so under normal conditions , there is no need for special insulation. However, the cabin floor under the landing gear compartment is open to the atmosphere and is at low temperature at high altitudes. Therefore, the cabin floor at the landing gear compartment is covered with resistance heating wires that are energized in the air. Keep warm to prevent travelers from freezing their feet.”

Lanlan asked again. "The anti-noise design of large aircraft is not a blank in our country's design field. Can our country overcome this technological minefield?"

for this. question, the chief engineer seemed more solemn, "I can say responsibly. No. The first large passenger aircraft developed by our country in the 1980s, the Yun-10, used glass wool quilts to insulate and keep warm during the flight. The cabin noise reaches the level of international advanced aircraft. The noise experienced by passengers during the flight is very low, and the passengers can talk to each other freely. I have experienced this personally when I flew on various foreign aircraft. The feeling of a passenger plane flying around the earth is the same. Nowadays, our material technology and motivation technology have made great progress, so this aspect will only get better and better. Once the large aircraft is successful, 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. Are the landing gears of large aircraft also special?" Lanlan expressed her gratitude to the chief engineer and asked curiously.

"Hmm. That's a really good question.

When a large passenger aircraft takes off, the weight increases. 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 for six without requiring a special runway," the chief engineer explained. "People are familiar with the "lazy" type of aircraft. Install one wheel under each landing gear strut. For passenger aircraft with slightly more passengers, double the number of wheels and install two wheels under the main landing gear strut. 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 frame is installed under the landing gear strut, 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 and Airbus. Not only are wheels needed to disperse ground pressure. It is also necessary to add buffer pillars to absorb the impact energy when the body touches down. The method adopted at this time was to increase the number of main landing gear struts. Not only is a pair of main landing gear mounted on the underside of the wing. And a pair of landing gear struts were added to the belly of the fuselage. Under the buffer struts of the wing landing gear and belly landing gear, multiple wheels are installed on the frame.

The frame-type landing gear is also an important basic design type of large passenger aircraft. Similarly, China has successfully implemented the frame-type landing gear design in the Y-10 test flight in the 1980s.

During the test flight, the Yun-10 has passed various tests from Shanghai Airport at zero altitude to Tibet Gonggar Airport, the highest plateau airport in the world, as well as actual takeoffs and landings at airports under different conditions in northern and southern Xinjiang.

In subsequent international exchanges, China also undertook the task of designing modified four-wheel landing gears for foreign aircraft models. The results have been praised by foreign aircraft manufacturers. therefore. Frame-mounted landing gear for large passenger aircraft. Domestic aviation design career is a skill that has been mastered. one. Positions already captured.

"You just told the story about our country's modified landing gear for foreign countries. To which country? The United States? When, can you talk about it in detail?" Lan Lan found that this topic should be more critical. So another question was asked.

Naturally, Engineer Lan would not hesitate to say a few more words to boost the morale of the soldiers, so he explained. "Last time. In the 1980s, when our country was assembling an American passenger plane, because the plane's main landing gear used two wheels, the pressure on the ground exceeded the endurance of some airport runways in our country. Therefore, the Civil Aviation Administration of China officially requested that the American passenger plane be modified It uses a four-wheel landing gear. This means that the frame landing gear must be installed at the lower end of the landing gear. The Chinese side completed the design, but the modification was approved. The project has not been implemented on the aircraft due to the cancellation of the modification requirement by the Civil Aviation Administration of China. However, our country’s design of the frame-mounted landing gear has been approved by the relevant U.S. design department.”

After hearing what the chief engineer said. Fan Wubing couldn't help but sneered, "Civil Aviation Administration. Hey."

Due to the disgraceful role played by the Civil Aviation Administration of China in the cancellation of the Transport 10 project, Fan Wubing now has a lot of resentment towards them, and Fan Wubing also believes that it is very reasonable to say that they are inherited from the same origin. Therefore, he has no doubt that there is still very serious bureaucracy and corruption in the current Civil Aviation Administration. After all, the annual large aircraft procurement cases can be clearly seen there.

Even more jealous. As for airport and ground construction, since there is no very strict supervision mechanism, they basically spend whatever they say needs to be spent, and the oil and water involved are ridiculously huge. Although the Civil Aviation Administration of China does not show off its integrity, its loopholes are indeed astonishingly large.

Fan Wubing once thought of taking advantage of the opportunity to make some moves with the Civil Aviation Administration of China. Unfortunately, his father is still in a situation where he is not yet stable, if he is successful in re-election this time. I do have the ability to operate it.

The problem with the Civil Aviation Administration of China has been solved, which will be of great help to me in the future to vigorously develop large-scale aircraft manufacturing and civil aviation "transportation".

Of course, the most important thing was that Fan Wubing had deep resentment towards them.

Especially when visiting the master blueprint of the large aircraft project, Fan Wubing suddenly appeared. It turns out that so many key technologies were implemented in the Yunshi project team, thus greatly shortening the expected design time. This alone can enable Fan Wubing to save billions in research and development expenses and more than 10 billion yuan in trial production costs.

If Yun Shi had not been disbanded that year, would Fan Wubing still have to invest hundreds of billions of dollars in its operation?

When I think about this, the question. Mr. Fan was naturally quite uneasy in his heart. If he really found this opportunity, he wouldn't mind taking care of these idiots in the industry who only seek to enrich themselves.