On September 12th, the competition began as scheduled!
The day before the competition, Lu Zhou and the others took the school bus from the new campus back to the old campus. They lived in the temporary dormitory arranged by the school.
The mattress and pillows were already prepared, and they only needed to bring a sheet. Those who weren't particular about it could just bring one person. After all, although the competition would last for 72 hours, on average, everyone's sleeping time was probably less than 10 hours.
For example, Lu Zhou was like this.
He had the most important task and he only had a short break the next day. Therefore, he did not even bring a change of clothes and went empty-handed. The first thing he did when he arrived at the new dormitory was to go to bed.
He had to force himself to sleep even if he could not.
He woke up at five o 'clock the next morning and slept in bed until seven o' clock. He went to the cafeteria to eat breakfast. Lu Zhou met up with Wang Xiaodong and Lin Yuxiang and they went to the dedicated computer room for the mathematical modeling competition.
According to the official registration information, there were 25347 teams from 1,338 colleges and universities in 33 provinces, municipalities, autonomous regions (including Hong Kong and Macao), the United States, and Singapore. At the same time, they clicked on the competition website and downloaded the questions to participate in the competition.
The competition was co-organized by the Higher Education Department of the Ministry of Education and the China Society of Industrial and Applied Mathematics. Due to the rigorous and fair evaluation, although the influence of the competition was slightly lower than the "Challenge Cup", the value of the national prize was higher than the "Challenge Cup".
At 7: 30 in the morning, the computer room was filled with ten teams.
Although many people chose to use their own laptops to answer the questions, they usually brought their computers to the computer room. After all, only the wifi in the computer room and the library could download theses from the internet for free. Instead of relying on unverified information on Baidu to win this kind of competition, it was better to burn a stick of incense and wait for the thesis to be automatically completed.
Professor Liu came around and smiled at Lu Zhou. He did not talk about the competition. He only asked, "How was your rest last night?", "Are you used to the old campus dormitory?" Then, he walked out of the computer room and drove back to the new campus to work on his own project.
At eight o 'clock, the bell rang.
Everyone quickly logged onto the official website and downloaded the questions.
According to the rules, the questions were divided into four sections: A, B, C, and D. Among them, AB belonged to the undergraduate section, and CD belonged to the specialist section. Each team had to choose a question as their goal. They had to complete and upload the md5 code generated by the official website software within 72 hours. On the day of the end of the competition, they had to upload the corresponding md5 code in pdf format.
Generally speaking, questions had to be chosen within half an hour. Everyone was racing against time to read the questions.
However, when they saw the question, everyone was dumbfounded.
"Question A: Chang 'e 3 soft landing trajectory design and control strategy … Question B: Creative flat folding table?! What the hell? What the hell is this year's topic? "
"Motherf * cker, it's completely different from our training!"
"I seemed to have done something similar a few days ago. I think it was a launch plan for the Shenzhou rocket … But I thought such a mysterious theme would definitely not appear. I didn't expect … I was too careless!"
"F * ck, boss, didn't you get 95 marks in advanced mathematics? Think of something! "
"What I'm learning is advanced mathematics, not how to fly to the heavens!"
"Designing a table … What's there to design about a table? Isn't it just four legs? Foldable … Should we install springs behind the legs of the chair? "
The computer room was quite lively. It was obvious that the students were dumbfounded by the questions and did not know where to start.
However, there were also experts in the room.
For example, the top student in Lu Zhou's class, Luo Rundong, was calmly communicating with his teammates.
There was also Liu Rui … This kid seemed to have a very reliable backer on his team. He had already finished reading the questions and was beginning to assign tasks to his two teammates.
Wang Xiaodong looked at the two questions downloaded from the official website and frowned.
The Sky Collapses Game.
Both questions were related to physics.
The first one involved orbital calculations in aerospace physics. High school physics knowledge alone was definitely not enough. Question B looked simple on the surface, but it was actually not much easier than the first question. It involved the dynamic movement analysis of the table legs, the force analysis of the material, and a series of other problems. Not only did it involve mathematical modeling knowledge, but it also required a certain amount of knowledge in structural mechanics, materials science, and even ergonomics.
However …
The "math genius" on the team had just started his sophomore year and had just started his physics class.
He had no choice but to avoid the difficult part.
The first question could not be solved because he did not have enough physics knowledge. The second question could be solved by collecting information on the Internet and converting it into a mathematical problem.
Wang Xiaodong looked at Lu Zhou and said, "Should we choose question B?"
Lu Zhou shook his head and said, "Choose question A."
"Question A?" Wang Xiaodong frowned and asked, "Are you okay with this?"
"I've already finished university physics. Although aerospace physics seems complicated, it's actually just the first three chapters," said Lu Zhou. He paused for a second and glanced at the team next to him. He then said, "Also, look at this computer room, there are enough people choosing question B."
Question AB was selected separately. Since question A was so scary, there were bound to be a lot of people choosing question B. This was the time to show the courage of "knowing there is a tiger on the mountain, but still go to the mountain". Leave the single-log bridge to the thousands of soldiers and horses and walk on their own path!
Of course, this was the choice Lu Zhou made because he was confident in question A.
Wang Xiaodong nodded expressionlessly. He naturally understood the meaning of Lu Zhou's last sentence.
"Okay then, I'll leave the modeling to you."
"Leave it to me."
The two geniuses made eye contact and reached a consensus.
Lin Yuxiang looked at the two teammates who had reached an agreement. She could not help but ask weakly, "Um … is there anything I can help with?"
Wang Xiaodong gave a smile that he thought was very gentle. He was about to say "leave it to me". However, before he could express any emotions on his face, Lu Zhou, who was immersed in a draft on an A4 paper, said without looking up, "Bring food and water, please."
He did not lack people for modeling, programming, and thesis writing. He just lacked someone to run errands.
Don't think that winning was easy. If he did not let this guy do some work, Lu Zhou would not be happy.
Wang Xiaodong: "…"
Lin Yuxiang did not complain. She nodded energetically and said, "Yeah, leave it to me!"
The advantage of mathematical modeling and thesis writing was that a lot of work that required two people to communicate could be done by one person. There were no problems with teamwork or communication skills.
At the same time, Lu Zhou, as the captain, could accurately give orders to Wang Xiaodong, who was responsible for programming.
This way, there would be almost no differences of opinion between the team members!
Skipping the question stem, there were three questions in total:
(1) Determine the position of the near-moon and far-moon points of the landing orbit, as well as the corresponding speed and direction of Chang 'e 3.
(2) Determine the landing orbit of Chang 'e 3 and the optimal control strategy for the six stages.
(3) Do the corresponding error analysis and sensitivity analysis for the landing orbit and control strategy you designed.
"The abstract part is the summary of the full text. This part can be done after the entire thesis is written. The focus is on the problem analysis after the restatement of the problem, which involves all of the ideas of the entire modeling. This is the soul of the entire thesis. " Lu Zhou bit his pen and typed on the keyboard. He wrote the outline of the thesis and began to define the soul of his thesis based on his previous draft.
[Problem one, in order to obtain the position of the near-moon and far-moon points of the landing orbit, as well as the corresponding speed and direction of Chang 'e 3, first use the knowledge of mechanics and known conditions to calculate. Using extreme thinking, the main deceleration phase of Chang 'e 3 is divided into an infinite uniform speed linear movement. Use the Matlab software to design the program and iterate the main deceleration phase …
[Problem two, in order to ensure the landing orbit of Chang 'e 3 and the optimal control strategy for the six stages, the goal must be to minimize fuel consumption. Based on this analysis, use the parameters obtained from problem one and use the Matlab software to identify obstacles in the digital elevation map. Then, use the algorithm to identify the obstacles and locate the landing point. Then, build a model to simulate the optimal landing orbit …
[In order to analyze the error of the landing orbit control strategy designed by problem two, first of all, list all the factors that may cause the error and analyze them …]
Lu Zhou was in the zone. He was fully focused on the topic in front of him.
The moment he finished analyzing the problem, he felt like his brain was extremely clear. He even had a general framework for the entire thesis in his mind.
The rest of the work was to translate this outline into mathematical language …
For most teams, the thesis was generally done after the modeling and programming. However, for Lu Zhou, the two could be done simultaneously!
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