Volume 1: Student Life Chapter 124: Team Training (Part 2)
Mananton glanced at the remaining three groups of nine people and said, "Dean Yang has already introduced me to you, and you all know me. But I haven't met you yet, so I'll call out your names first and recognize your faces. At the very least, I have to match the people with their names, right?"
He called Chen Zhou and others to the front row of the classroom, took the list of the three participating teams, and called out their names.
When calling the roll, Mananton would ask a few more questions, such as which department they were from, what year they were in...
After the roll call, Mananton returned to the podium, turned on the computer, connected it to the projector, and the PPT appeared on the screen: "Then let's get started. Let's look at the sample questions first, and then we will have the formal training."
Chen Zhou took a look and found that it was a bit similar to a previous competition question, but this one was more difficult.
【Protection of manned spacecraft on Mars. 】
Mananton pointed to the example question on the PPT and said, "This competition question originates from a specific engineering problem related to astronomy and space science, and is closely related to the development of the national economy, space development, and the prospects for the development of military science and technology. This question is mainly used to solve the harm of high-temperature particles and cosmic radiation in space to the human body. Yes, this is a manned spaceflight problem."
As Mannanton said, this question requires consideration of people, while the previous question required consideration of objects.
After a pause, Mananton cut to the next slide, a schematic diagram of the Mars rover's flight.
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 the manned spacecraft on Mars?"
Chen Zhou took a look at the flight diagram, which roughly marked the entire process from low-Earth orbit to leaving Earth orbit, flying to Mars, entering Martian orbit, and landing.
Manandon's problem is that it is necessary to consider the changes in the radiation environment when the orbits between the Earth and Mars change.
Thinking of this, Chen Zhou looked around and saw that no one answered, so he stood up and answered: "Professor Ma, during the flight of the manned spacecraft on Mars, 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 requires distinguishing 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: en route to Mars, in orbit around Mars, on the surface of Mars, in orbit around Mars, and on the way back to Earth."
"It can be analyzed in combination with the specific conditions of each stage. However, two points need to be emphasized. One is that the spacecraft needs to take the magnetic field on the surface of Mars into consideration."
Fang Jieming tilted his head to glance at Chen Zhou, somewhat surprised at Chen Zhou's eloquent speech.
Not only Fang Jieming, but everyone present's eyes were on Chen Zhou at this moment.
Isn’t this student from the mathematics department?
Waving his hand, Mananton motioned for Chen Zhou to sit down and praised him, "You have considered it very comprehensively and your answer is very specific. Very good!"
He switched to the next slide, and the content on it was almost exactly the same as Chen Zhou's previous answer.
Pointing to several situations on the slide, Mananton emphasized: "As Chen Zhou just said, specific situations require specific analysis. This is also what I want to remind you. When competing, you must consider the intention of the entire competition question and consider it comprehensively before moving on to the next step."
As Mananton spoke, the PPT switched to the next slide.
It is about the radiation shielding analysis during each stage of detection flight.
This part is actually the combination of theoretical analysis and theoretical calculation.
The shielding performance of different shielding materials is different at different densities and under different conditions.
For this example, what needs to be considered is what shielding materials should be used in various radiation environments to ensure the safety of the spacecraft and the astronauts.
Looking at these contents, Fang Jieming frowned slightly. He didn't understand this knowledge at all.
Even if he spent time looking up literature, he was still a little confused.
In this case, if he is responsible for theoretical calculations, it will definitely delay time.
Thinking of this, Fang Jieming looked at Chen Zhou again.
After Mananton finished explaining the example question, he gave a corresponding question as a training question for Chen Zhou and the other three groups.
The title is [Aerobraking a space probe at Neptune].
This is also a problem in the aerospace field.
The background of the topic is [In order to enter a circular orbit around another planet, a spacecraft must change its orbit upon arrival, otherwise it will fly over the planet. If the spacecraft's orbit will pass through the planet's atmosphere, the resulting drag can greatly reduce the amount of fuel required. Assuming a 2500 kg spacecraft reaches Neptune at a speed of 30 km/s, how much error is allowed when designing a trajectory through Neptune's outer atmosphere, and how much fuel can be saved by using Neptune's atmosphere for braking. ]
Neptune's atmosphere?
Using the atmosphere's air brakes?
Fuel consumption conversion?
etc……
The preliminary preparation for this question requires checking a lot of literature.
But fortunately the question itself is not difficult.
Chen Zhou and the other two turned on the computer, and while waiting for the computer to boot up, they had a brief conversation.
Basically according to the results of the last assignment, Yang Yiyi was responsible for theoretical analysis, Chen Zhou and Fang Jieming performed theoretical calculations at the same time, and then Fang Jieming programmed and built the model. After that, Yang Yiyi improved the theory, went through the calculations and model again, and finally Chen Zhou edited the paper.
After confirming their respective division of labor, the three first concentrated on searching for literature and materials to figure out Neptune and the spacecraft.
After that, Yang Yiyi made a reasonable analysis and put forward hypotheses based on the actual situation of the question and combined it with the principles of physics.
This is why the question itself is not difficult. The physical principles used in the question are very simple, and it can be combined with similar situations . This makes it easier to come up with reasonable hypotheses.
During this process, Chen Zhou and Yang Yiyi were constantly discussing to ensure that the hypothesis plan was more reasonable.
Fang Jieming, who was standing next to him, was silently looking up literature and programming, unable to say a word.
After the plan is hypothesized, the next step is theoretical calculation.
Yang Yiyi packed a set of information and sent it to Chen Zhou and Fang Jieming.
After Chen Zhou unzipped the data, he took out a piece of draft paper and a pen and started calculating.
I would communicate with Yang Yiyi from time to time to confirm the accuracy.
Fang Jieming encountered the problem he had worried about before. Due to his unfamiliarity with physics, the calculations took a very long time.
He was too embarrassed to ask Yang Yiyi. After all, when Chen Zhou was calculating, he always discussed the issue of rationality with Yang Yiyi.
If he asked about these basic calculations , it would be embarrassing...
Most importantly, seeing Chen Zhou and the other man chatting and laughing, Fang Jieming couldn't ask...
