Mananton glanced at the remaining three groups of nine people and said, "Director Yang has introduced me to you just now, and you all know me. But I haven't known you yet, I'll name it first.

, recognize your face. At least, I have to match the name with the person, right?"

He called Chen Zhou and others to the front row of the classroom, took the list of three participating teams, and called out the name.

When calling the name, Mananton would ask a few more questions, which department is bigger...

After the call was finished, Mananton returned to the podium, turned on the computer, connected to the projector, and the ppt appeared on the screen: "Then let's start, look at the examples first, and then conduct formal training."

Chen Zhou took a look and found it was a bit similar to the previous competition question, but this one was even more difficult.

【Protection of Mars manned spacecraft.】

Mananton pointed to the example question on PPT and said: "This competition question originates from specific engineering issues related to astronomy and space science, and is closely related to the development of the national economy, space development and military science and technology. This issue is mainly

It is used to solve the harm of high-temperature particles and cosmic radiation in space to the human body. Yes, this is a problem of manned space flight."

As Mananton said, this requires people to be considered, while the previous question needs to be considered objects.

After pausing for a moment, Mananton cut to the next slide, which was a flight diagram of a Mars rover.

Pointing to this picture, Mananton asked: "So, can any student tell me what radiation environments need to be considered during the entire exploration flight of a manned Mars spacecraft?"

Chen Zhou took a look at the flight diagram, which roughly started from the low-Earth orbit, went to Mars, entered the Mars orbit, and landed, and was marked.

The problem with Mananton is that it is necessary to consider the changes in the radiation environment when the orbits between earth and fire change.

Thinking of this, Chen Zhou looked around and saw that no one answered, so he stood up and replied: "Professor Ma, during the flight of Mars manned spacecraft, its radiation environment mainly includes galactic cosmic rays, solar cosmic rays, solar wind and coronal matter.

It consists of ejection, etc..”

"But the analysis of the specific radiation environment requires the distinction between the different stages of the spacecraft. From this flight diagram, we can see that the entire exploration flight can be simply divided into the orbit of the Mars on the way to Mars,

These stages are the surface of Mars, the orbit position of the orbit of the ring and the way back to Earth."

"It is enough to analyze it in combination with the specific situation of each stage. However, two points need to be emphasized. One is that the spacecraft needs to consider the magnetic field on the Mars surface."

Fang Jieming turned his head and looked at Chen Zhou, and was a little surprised at Chen Zhou's talk.

Not only Fang Jieming, but everyone present's eyes were all on Chen Zhou at this moment.

Isn’t this student from the Department of Mathematics?

After waved his hand, Mananton signaled Chen Zhou to sit down and praised: "They were considered comprehensively and the answers were specific enough, which was very good!"

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

Pointing to several situations on the slide, Mananton emphasized: "As Chen Zhou said just now, the specific situation and specific analysis. This is what I want to remind you that when competing, you must consider the entire competition question clearly.

Intent, consider it comprehensively and proceed to the next step.”

Mananton said, ppt cut to the next slide again.

It is about the radiation shielding analysis of various stages of the flight.

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

Different shielding substances have different shielding properties under different densities and conditions.

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

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

Even if he was asked to spend time searching for documents, he was a little confused.

In this case, if he is responsible for theoretical calculations, it will definitely delay time.

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

After Mananton finished explaining the example questions, he came up with a corresponding question as the training questions for Chen Zhou and his three groups.

The title is [Air braking the space probe on Neptune].

It is also a problem in the aerospace field.

The topic background is [In order to enter a circular orbit around another planet, the spacecraft must change its orbit upon arrival, otherwise it will fly over that planet. If the spacecraft's orbit will pass through the planet's atmosphere, the resulting drag can

Absolutely reduce the amount of fuel required. Assuming a 2500 kg spacecraft arrives at Neptune at a speed of 30 km/s, how much error is allowed to be used to brake using Neptune's atmosphere when designing orbits through the outer atmosphere of Neptune.

, how much fuel can be saved.]

Neptune's atmosphere?

Use air braking in the atmosphere?

Fuel consumption conversion?

etc......

There are a lot of literature required to be looked up for the preliminary preparation of this question.

Fortunately, the question itself is not difficult.

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

Basically according to the results of the last allocation, Yang Yiyi was responsible for theoretical analysis. Chen Zhou and Fang Jieming performed theoretical calculations at the same time, and Fang Jieming then programmed and constructed the model. After that, Yang Yiyi improved the theory and went through the calculation and model again, and finally edited by Chen Zhou.

paper.

After confirming their respective division of labor, the three of them first searched for documents and figured out Neptune and the spacecraft first.

Then, Yang Yiyi made reasonable analysis and put forward hypotheses based on the actual situation of the question, combined with physical principles.

The reason why this question itself is not difficult is that the physical principles used in the question are very simple and can be combined with similar scenarios on the earth. It is easier to put forward reasonable assumptions in this way.

During this process, Chen Zhou and Yang Yiyi were constantly discussing to ensure that the assumption plan was more reasonable.

Fang Jieming next to him was silently searching the documents and watching programming, and couldn't put a single word.

After the assumption of the plan is made, it is theoretical calculation.

Yang Yiyi packed a piece of information 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 it.

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

Fang Jieming had problems he had previously worried about, because his unfamiliarity with physics knowledge made it extremely time-consuming to calculate.

He was embarrassed to ask Yang Yiyi, after all, Chen Zhou discussed rationality with Yang Yiyi when calculating.

If he asked about these basic calculations, he would be embarrassed...
Chapter completed!