Manandon glanced at the remaining three groups of nine people and said, "Dean Yang has already introduced me to you just now, and you all already know me. But I haven't known you yet, so I'll take a name first, and recognize your familiar face. At the very least, I've got to match people's names, right?"

He beckoned Chen Zhou and others to the front line of the classroom, took the list of three groups of participating teams, and called the names.

During the roll call, Manandon would ask a few more questions, which department is it, and how big is it......

At the end of the roll call, Manandon returned to the podium, turned on the computer, connected to the projector, and the PPT appeared on the screen: "Then let's start, first look at the example questions, and then conduct formal training." ”

Chen Zhou glanced at it, it was a bit similar to a previous question, but this one was more difficult.

[Protection of manned spacecraft on Mars. 】

Manandon pointed to the example questions on the PPT and said: "This competition question originates from specific engineering problems related to astronomy and space science, and is closely related to the development of the national economy, space development and the development prospects of military science and technology. This problem is mainly used to solve the harm of high-temperature particles and cosmic radiation in space to the human body. That's right, it's a question of manned spaceflight. ”

As Manandon said, this is about people, and the previous question is about things.

After a pause, Manandon cut to the next slide, which was a schematic diagram of the Mars rover's flight.

Pointing to this picture, Manandon asked, "So, can anyone tell me what radiation environments need to be considered during the entire exploration flight of the Martian manned spacecraft?"

Chen Zhou glanced at the flight diagram, roughly starting from low earth orbit, to leaving the earth orbit, flying to Mars, entering the Martian orbit, landing and other processes, all of which were marked.

Manandon's problem is that it is necessary to consider the changes in the radiation environment when the orbits between the earth and fire change.

Thinking of this, Chen Zhou looked left and right, and when he saw that no one answered, he got up and replied: "Professor Ma, during the flight of the Mars manned spacecraft, its radiation environment is mainly composed of galactic cosmic rays, solar cosmic rays, solar wind and coronal mass ejections. ”

"However, the analysis of the specific radiation environment needs to distinguish the different stages of the spacecraft. From this flight diagram, we can see that the entire exploration flight can be simply divided into several stages: on the way to Mars, the orbital position around Mars, the surface of Mars, the orbital position around Mars, and the way back to Earth. ”

"It is enough to analyze the specific situation of each stage. But there are two points to emphasize, one is that the spacecraft needs to take into account the magnetic field on the surface of Mars. ”

Fang Jieming glanced at Chen Zhou, and was a little surprised by Chen Zhou's eloquent conversation.

Not only Fang Jieming, but the eyes of everyone present were on Chen Zhou at the moment.

Isn't this student from the math department?

Waving his hand, Manandon motioned for Chen Zhou to sit down, and praised: "The consideration is very comprehensive, and the answer is specific enough, which is very good!"

He cut to the next slide, and the content on it was almost exactly the same as Chen Zhou's answer just now.

Pointing to several situations on the slide, Manandon emphasized: "As Chen Zhou just said, specific scenarios, specific analysis. This is also what I want to remind you, when you are competing, you must think clearly about the intention of the whole question, and then consider it comprehensively before proceeding to the next step. ”

Manandon said, and the PPT cut to the next slide.

It is about the analysis of radiation shielding at each stage of the detection flight.

This part is actually a combination of theoretical analysis and theoretical calculation.

The shielding performance of different shielding substances is different under different densities and different conditions.

As far as this example is concerned, what needs to be considered is what shielding materials should be used in each radiation environment to ensure the safety of spacecraft and astronauts.

Looking at these contents, Fang Jieming frowned slightly, he didn't understand this knowledge at all.

Even if he was asked to spend time looking up literature, he was a little lost.

In this case, if he were to be in charge of theoretical calculations, it would definitely be a waste of time.

Thinking of this, Fang Jieming glanced at Chen Zhou again.

After Manandon explained the example questions, he came up with a corresponding question as a training question for Chen Zhou's three groups.

The title is "Air Braking Space Probes on Neptune".

The same is a problem in the field of aerospace.

The background of the title is [In order to enter a circular orbit around another planet, the spacecraft must change its orbit upon arrival, or it will fly past the planet. If the orbit of the spacecraft will pass through the planet's atmosphere, then the resulting drag can significantly reduce the amount of fuel required. Suppose a 2,500-kilogram spacecraft reaches Neptune at a speed of 30 km/s, how much error is allowed when designing its orbit through Neptune's outer atmosphere, and how much fuel can be saved by braking using Neptune's atmosphere. 】

Neptune's atmosphere?

Brake with air in the atmosphere?

Fuel consumption conversion?

Wait a minute......

The preparation of this question requires a lot of literature.

But fortunately, the topic itself is not difficult.

Chen Zhou and the three turned on the computer, and while waiting for the computer to turn on, the three of them briefly communicated again.

Basically, according to the results of the last assignment, Yang Yiyi was responsible for the theoretical analysis, Chen Zhou and Fang Jieming carried out theoretical calculations at the same time, and then Fang Jieming programmed and built the model, and then Yang Yiyi improved the theory, went through the calculation and model again, and finally Chen Zhou edited the paper.

After confirming their respective division of labor, the three of them first focused on searching for literature and materials, and figured out Neptune and the spaceship first.

After that, Yang Yiyi put forward hypotheses based on the actual situation of the topic, combined with physical principles, reasonable analysis.

The reason why the question itself is not difficult is also because the physical principles used in the question are very simple, and they can also be combined with similar scenarios on Earth. It's also easier to come up with reasonable assumptions this way.

In this process, Chen Zhou and Yang Yiyi are constantly discussing to ensure that the hypothetical plan is more reasonable.

Fang Jieming, who was next to him, was silently checking the literature, looking at the programming, and couldn't insert a word.

After the scheme is hypothetical, it is a theoretical calculation.

Yang Yiyi packed a document and sent it to Chen Zhou and Fang Jieming.

After Chen Zhou unzipped the information, he took out the draft paper and pen and calculated.

From time to time, I will communicate with Yang Yiyi to confirm the accuracy.

Fang Jieming had the problem he was worried about before, because he was not familiar with the knowledge of physics, and it was extremely time-consuming to calculate.

He was embarrassed to ask Yang Yiyi, after all, when Chen Zhou was calculating, he was discussing the issue of rationality with Yang Yiyi.

If he asks about these basic calculations, it will be shameless......

The most important thing is that looking at the appearance of Chen Zhou and the two talking and laughing, Fang Jieming couldn't ask......