Chen Liangwei once studied at St. Petersburg University, he spoke German very slippery, and English was very general, plus he usually dealt with radar and avionics a lot, so he didn't react for a while, but Lu Yang immediately understood what Yang Weining said: "Wei Ning, what do you mean by CAD ComputerAidedDesign?"

Yang Weining nodded and said, "Exactly!"

Chen Liangwei said curiously: "Old road, what is this CAD?"

Lu Yang smiled bitterly: "CAD is the meaning of computer-aided design, and foreign countries have only been developed for a long time, and our country is completely blank." Pen ~ fun ~ cabinet www.biquge.info In 1979, when the chief minister visited the United States, An Shaohua, deputy director of the Ministry of Aviation Industry, led an 11-member delegation of the aviation industry to visit the Douglas DAC and Lockheed LAC aircraft companies in the United States, and I was one of them. During that time, DAC organized two weeks of systematic lectures, reporting in the morning and visiting in the afternoon, and LAC organized us to visit aircraft design, manufacturing, and test sites in California and Georgia, and fully demonstrated to us computer-aided design (CAD), computer-aided manufacturing (CAM), computer-aided engineering (CAE), computer-aided process planning (CAPP), With the application of product data management (PDM) in aircraft development and production, with these auxiliary software, the efficiency of the Americans in the aircraft development and design process has almost thrown us off by a tenfold gap. At that time, we saw that shock, the Americans really gave us a sense of what it means to be an aviation superpower. ”

Later, after the delegation consulted the chief, it was decided to spend $200,000 to introduce a set of CADAM software to symbolically establish a cooperative relationship between China and the United States, but Lockheed asked us to buy three L1011 wide-body airliners for a total of $300 million before we could get CADAM, and the matter was over. ”

Speaking of this, Lu Yang fell silent, and his gaze at Yang Weining was more or less disappointed.

Because of the relationship between the Lu and Yang families, before Yang Weining went to the 611 Institute, Lu Yang specifically checked Yang Weining's performance and achievements in Northwestern Polytechnical University, and felt that this young man was a manufacturable material and worthy of vigorous training, but when he heard him mention it today, his impression was greatly reduced.

Yang Weining is still too impetuous, maybe where did he hear the term CAD, so he was in a hurry to take it out and perform in front of himself and Chen Liangwei, the problem is that this thing is in the hands of Americans, you can't buy it, how can you use it to solve the problem.

Chen Liangwei sighed secretly in his heart, his mouth was hairless, and he couldn't do things well, Yang Weining was only a recent graduate after all, and he still needed some experience if he wanted to make a difference in the field of aircraft design and development in the future.

Yang Weining didn't seem to see the disappointment in the eyes of Lu Yang and Chen Liangwei, and smiled indifferently: "Uncle Lu is right, in the field of computer-aided design, there is still a relatively large gap between us and foreign countries, but this gap is not as big as we imagined, and it is not as difficult to catch up as we imagined." ”

Lu Yang frowned, and just as he wanted to speak, he heard Yang Weining continue: "Uncle Lu, Uncle Chen, don't be in a hurry to refute, listen to my point of view first." In fact, it has only been a few years since the development of CAD technology abroad. In the early days of CAD software, CAD was just a substitute for the drawing board, that is, ComputerAidedDrawing (orDrafting), not ComputerAidedDesign, which we often discuss today. ”

"In the 60s, there were 3D CAD systems abroad, but the CAD software at that time was only a very simple wireframe system, which could only express basic geometric information, and could not effectively express the topological relationship between geometric data. Due to the lack of surface information of the form, neither CAM nor CAE can be realized. Until the 70s, with the boom of the aircraft and automobile industries, engineers encountered a large number of freeform problems in manufacturing, and at that time they could only use multi-section views and characteristic latitudes to approximate the design of freeform surfaces. However, due to the incompleteness of the three-view method, it often happens that after the design is completed, the sample produced is very different from the designer's imagination or even completely different. Designers cannot guarantee whether the surface shape of their design can meet the requirements, so they often make clay models in proportion as the basis for design review or scheme comparison. This approach is slow and cumbersome, and the manufacturing process greatly delays the development of the product. ”

Lu Yang and Chen Liangwei couldn't help but look at each other, they have been in the aviation industry for decades, and they have a personal experience of the difficulties Yang Weining said.

The two couldn't help but secretly say, although this kid looked ashamed before, but if you listen carefully, you really have goods in your stomach.

Yang Weining waited for Lu Chen and the others to digest their words before continuing: "Uncle Lu, you just mentioned that the CADAM software used by Lockheed is actually not the latest technology in the CAD field. Not long ago, Dassault researchers proposed the Bessel algorithm, which allows people to use computers to deal with curves and surface problems, and they have developed a free-form surface modeling method characterized by surface models on the basis of the two-dimensional drawing system CADAM, and launched the three-dimensional surface modeling system CATIA. ”

"CATIA?" AT THIS MOMENT, LU YANG WAS NOT CALM: "WEI NING, HOW DID YOU KNOW ABOUT THIS MATTER?"

This era is not the era of the information explosion in the future, and if China wants to track the latest scientific research information abroad, it can only subscribe to some English journals.

The question is, in a key field like the aerospace industry, where many key technologies are kept secret, how did Yang Weining know that Dassault had solved the freeform modeling method?

Yang Weining secretly said that it was not good, he seemed to have said something wrong, and hurriedly said: "Uncle Lu, I also saw it in a foreign English journal in my father's office, and I forgot which journal it was." ”

Lu Yang reluctantly accepted Yang Weining's explanation, and said with a smile on his face: "That guy in Zhenguo has become a technocrat, and he still has the leisure to read English journals?"

At this time, Chen Liangwei also interjected: "Wei Ning, you just said that you have a way to solve our dilemma, are you referring to the purchase of CATIA systems from the French?"

Although China and France belong to the two camps of the East and the West, the military-industrial cooperation has a long history, from the exchange of atomic bomb miniaturization technology to the later Super Wasp helicopter, the two countries have a deep friendship.

If you spend money to introduce the CATIA system from the French, you really have a chance of success.

Lu Yang and Chen Liangwei couldn't help but glance at each other, and they both saw what each other was thinking.