"It's okay to say in terms of design, but the accuracy of 3D printing is still not as accurate as traditional processing methods. ”

If there is a topic to talk about, then the journey on the plane will not seem so boring.

At present, it takes at least 10 years from design to completion of engines in our country, and 30-36 months or about three years abroad.

The reason why it takes so long is that too many physical experiments have been done. It takes more than a year to build an engine, not counting design, but to build it; from the perspective of research, we have to engage in several rounds of iterations, and every time the design fails to meet the goal, we have to start again.

It is urgent to shorten the cycle and number of iterations, and to innovate the concept and method of engine design.

There used to be a very famous saying in our country, called the engine is tested, this sentence is actually quite right, the engine needs a lot of test verification, but there is another layer behind this sentence, that is, our computing design level is not very good.

However, there was another saying in the West almost ten and a half years ago, It's better not to develop aero engines through a 'build & bust' process.

To develop an aero engine, it is better not to go through the process of "build and destroy".

Different from the previous "experiment is part of the design iteration", through the MASK is Modelling, Analysis, Simulation, Computing method, the design of aero engines by advanced Western enterprises is more of a series of numerical calculations and analysis, and on this basis, refined optimization.

Experimentation is largely a confirmation of the design, rather than being directly involved in the iteration of the design, which is a huge difference.

Fortunately, the current Huaxia has also begun to take such a path.

Computational analysis is the main direction of independent research and development of engines.

As aircraft become more complex, the number of test hours will increase by 1 million hours by 2030 if the traditional model is followed, and can be reduced by two orders of magnitude to 100,000 hours if analytical calculations are used.

By making full use of computing power, it is possible not only to shorten time, but also to innovate design with the help of the "imagination" of computers in the age of AI.

Nowadays, most of the engineering optimization is continuous, and sometimes you can't imagine what the shape looks like, what is topology optimization? Now you can set the conditions to be met, and use artificial intelligence to let the computer think without any constraints.

And this will have a revolutionary impact on the design of the aircraft.

In fact, this method of computational analysis is also applied to material research and development.

Experimental data, computational simulation data, and integration, whether good or bad, can form a database with a certain number of databases. In the database, machine learning models can be built based on certain properties of materials, which can quickly predict the properties of materials and even design new materials, solving the problems of long cycle times and high costs.

In 2018, a review article entitled "Application of Machine Learning in Molecular and Materials Science" was published in the journal Nature.

The article introduces in detail the important role of machine learning in guiding chemical synthesis, assisting in multidimensional material characterization, and obtaining new material design methods, and says that the new generation of computer science will have a transformative effect on materials science.

"Machining accuracy, this is a big problem!"

Zhang Chuyang also knows that although they are engaged in materials, they also know a lot about mechanical engineering, after all, the use of materials is the category of mechanical engineering.

"Yes!" Mu Jingchi sighed.

Huaxia's high-precision processing is indeed not very good, and he can't solve it for the time being.

The issue of aero engines will not be made easy by the discussion between the two, but the two of them have talked about various aviation materials starting with aero engines.

Materials used in cylinders, pistons, compressors, combustion chambers, turbines, shafts, tail nozzles, fuselages, wings, aluminum alloys, titanium alloys and composite materials.

···

4 hours later.

The plane landed smoothly at Meilan International Airport in Haikou.

At the airport, a special escort came to take Professor Yang and his party to the hotel.

The layout of the hotel is not bad, perhaps because of the fact that tourism attracts tourists, and the hotel looks quite luxuriously built at first glance.

First, sign in under the arrangement of the hotel reception staff, then get the room card, and finally get on the elevator to enter your room. Mu Jingchi and Zhang Chuyang are in the same room.

This is a suite, the academic conference organized by the national ministry is different, with a large living room, two bedrooms, each equipped with a separate bathroom.

When you open the glass door of the living room, you will find yourself on the balcony with a direct view of the ocean.

The sea breeze is blowing, which is very refreshing and cool.

"Chizi, go meet your classmates. Zhang Chuyang put down the things in the book and handed the mobile phone to Mu Jingchi, "I sent it to Moments to know that Wang Wenqiao also came to this meeting." ”

Mu Jingchi saw the likes and comments in the WeChat circle of friends, and nodded, "Let's go, let's see how he is doing." ”

Wang Wenqiao, Zhang Chuyang, and Mu Jingchi are classmates and scholars, but the direction is semiconductor materials. After graduating from my bachelor's degree, I went to Stanford University in the United States to study for a doctorate, and I haven't been in touch for a long time.

After all, everyone is busy.

"Yoko!"

Coming to the hotel lobby, a shout from a familiar voice made Zhang Chuyang's steps stand, and then Mu Jingchi saw a figure that he hadn't seen for a long time.

It's just that there is a slight difference from the figure in my previous memory, the glasses seem to have become thicker, and the hairline seems to have moved back slightly.

It was Wang Wenqiao.

He walked over quickly and hugged Zhang Chuyang.

"Mu Jieqing is also here, it's rare!"

Mu Jingchi had almost no friends before, so Wang Wenqiao didn't come over to hug him, but when he saw Mu Jingchi, he still showed a happy smile.

"What?" Mu Jingchi listened to Wang Wenqiao's words, and he didn't know why for a while.

"Mu Jieqing. Wang Wenqiao pushed his glasses and explained to Mu Jingchi, "Your Z325 series aluminum alloy has caused a strong wave in our circle, especially those of us who are doctors in the same grade. Later, the news that you won the National Outstanding Youth Award spread in our circles, and we all called you that in private. ”

Mu Jingchi turned his gaze to Zhang Chuyang, only to see Zhang Chuyang shrugging.

"It's just that you're not very active, that's what we called you when we were in school, this is an honorific title, which shows recognition of your identity as a big guy. ”

Zhang Chuyang turned the topic to Wang Wenqiao, "I haven't seen you for more than half a year, you have changed a lot!"

"There's no way, there's a lot of pressure on scientific research in the United States. Wang Wenqiao grabbed his hair, "Every time I wash my hair, I am terrified, and I grab a lot of it." ”

As he spoke, Wang Wenqiao looked at Zhang Chuyang and then at Mu Jingchi, "You two haven't changed much." ”

"I'll forget it. Zhang Chuyang skimmed towards Mu Jingchi, "This guy has changed a lot." ”