Scholar’s Advanced Technological System

竞赛 On September 12th, the competition is on schedule!

一天 On the day before the competition, Lu Zhou and others took the school bus to return to the old campus from the new campus, and lived in the temporary dormitory arranged by the school.

Mattresses and pillows are ready, just bring a set of sheets, people who are not particular even go directly to the individual, after all, although the competition time is 72 hours, the average bedtime for everyone may be ten Hours are not here.

For example, Lu Zhou.

His task is the heaviest and the work to be done is the biggest. Only the next day can take a short break, so he simply didn't bring any changed clothes and left empty-handed. The first thing to do in the new dormitory is to sleep in bed.

If you can't sleep, you have to force yourself to sleep.

I woke up at five in the morning the next morning and closed my bed at seven o'clock, went to the cafeteria for breakfast, Lu Zhoubian and Wang Xiaodong and Lin Yuxiang would reconcile, and went to school together for the mathematical modeling contest. Dedicated computer room.

According to the officially announced registration information, this competition has more than 70,000 college students from 25 provinces, 33,347 universities, 33 provinces, municipalities, autonomous regions (including Hong Kong and Macau) and 1338 universities in the United States and Singapore. At the same time, click on the competition website to download the topic to participate game.

The competition was co-sponsored by the Department of Higher Education of the Ministry of Education and the China National Institute of Industrial and Applied Mathematics. Because of its rigor and fairness of review, although its influence is slightly less than the "Challenge Cup", the gold content of the national award is in some sense Better than the Challenge Cup.

七 At 7:30 in the morning, there are already ten teams in the computer room.

Although many people choose to use their notebooks to answer questions, usually they still bring the computer to the computer room. After all, only the wifi in the computer room and library can download papers from the Zhinet for free. This kind of competition is expected to win through undocumented materials on Baidu. It is better to complete a thesis such as burning a joss stick.

Teacher Liu came around and laughed and said hello to Lu Zhou, and did not talk about the competition, so he greeted "How was the rest last night?", "The dormitory of the old campus is not used to ? "And then walked outside the computer room and drove back to the new campus to work on his project.

At eight o'clock, the bell rang.

Everyone quickly landed on the official website to download the title.

According to the rules, the questions are divided into four major ABCD questions, of which AB belongs to the undergraduate group and CD belongs to the specialist group. Each group selects a question as the goal, completes and uploads the md5 code generated by the official website software within 72 hours, and uploads a pdf-format paper corresponding to the md5 code on the day when the competition ends.

Generally speaking, the topic selection must be controlled within half an hour, and everyone is racing against the clock.

However, when they saw the problem, everyone was dumbfounded.

"A question Chang'e III soft landing orbit design and control strategy ... B question creative flat folding table ?! Hold the grass? What's the question this year?"

"MMP, completely different from the training we do!"

"I seem to have done something similar a few days ago, as if to design a launch plan for the Shenzhou Rocket ... but I think such a mysterious theme is definitely not coming out, I didn't expect ... the idea!"

"Grass, big brother, aren't you ninety-five high? Think of a way!"

"I'm learning high numbers, and why don't I learn how to go to heaven!"

设计 "Design the table ... what is the design of the table, isn't it just four legs? Foldable ... we put a spring behind the legs of the stool?"

The machine room is quite lively. It can be seen that the students are forced by the whole face of this topic and cannot start.

But there are masters in it.

For example, Luo Rundong, the second school tyrant in the Luzhou class, is now calmly communicating with his teammates in a quiet voice.

And Liu Rui ... the kid's team seems to have a very reliable thigh. Now that they have finished reading the questions, they start to assign work to two teammates.

Looking at the two questions downloaded from the official website, Wang Xiaodong frowned.

The sky collapsed.

Both topics are related to physics.

The previous one involves orbit calculations in aerospace physics. High school physics knowledge is definitely not enough. Question B is superficially simple, but it is not much easier than the first question. It involves the dynamic analysis of table legs. A series of questions, such as material stress analysis, involve not only mathematical modeling knowledge, but also a certain degree of interest in structural mechanics, materials science, and even ergonomics.

However ...

The "mathematical genius" in the team just started their sophomore year and even just started a physics class.

I ca n’t help it, I avoid it.

The first physics knowledge is not enough to do, and the second one can collect data through the network, and find ways to turn it into a mathematical problem to solve.

晓 Wang Xiaodong looked at Lu Zhou, "Would you like to choose question B?"

Lu Zhou shook his head: "Choose A."

"A question?" Wang Xiaodong frowned. "Are you okay?"

"In college physics, I have already finished. Although the space physics may seem complicated, in fact, it is only the contents of the first three chapters." After a pause, Lu Zhou glanced at the team next to him and continued, In this computer room alone, there are already enough people to choose question B. "

AB questions are judged separately. Under the scary situation of A question, there will be many candidates for B question. At this time, it is time to take the courage to "know that there are tigers in the mountains, and prefer to travel to Hushan", leave the wooden bridge to thousands of soldiers, and walk your own Yangguan Avenue smartly!

Of course, this is also the choice made by Lu Zhou when he is confident in question A.

Wang Xiaodong nodded expressionlessly, and naturally understood the meaning of Lu Zhou's last sentence.

"That line, the modeling is up to you."

"I will handle it."

Eye contact, the two Xueba have reached a consensus.

Lin Yuxiang looked at the two teammates who had reached a consensus with a grim expression, and couldn't help but ask weakly, "That ... Is there anything I can do for you?"

Wang Xiaodong showed a smile that he thought was very gentle and said that he had just prepared a handsome sentence "Just leave it to me", but he hadn't waited for him to develop his feelings on that facial paralyzed face, and was grappling with the draft on A4 paper Lu Zhou, without raising his head, said politely, "Bring food and water, please, please."

Modeling, programming, and dissertation are no shortage of people, so there is no errand.

Don't think that lying down is so easy to lie down. If you don't let this guy do some work, Lu Zhou's heart is not balanced.

Wang Xiaodong: "..."

Yulin Yuxiang did not complain, nodded enthusiastically: "Well, it's on me!"

The advantage of one person completing mathematical modeling and thesis writing is that many tasks that require two people to communicate can be completed by one person, and there are no problems such as teammates' tacit understanding and ability to express understanding.

At the same time, in the case of grasping the modeling thesis, Lu Zhou, as the captain, can accurately give orders to Wang Xiaodong, who is responsible for programming.

This way, there is almost no difference of opinion between the players!

Crossing the question, there are three questions:

(1) Determine the positions of the near moon point and the far moon point of the landing preparation orbit, and the magnitude and direction of the corresponding speed of Chang'e-3.

(2) Determine the landing orbit of Chang'e-3 and the optimal control strategy in 6 stages.

(3) Do the corresponding error analysis and sensitivity analysis for the landing orbit and control strategy you designed.

"The summary section is a summary of the full text. This section can be completed after the entire article is written ~ www.readwn.com ~ The focus is on the problem analysis after the problem restatement, which involves the entire idea of ​​the entire modeling, the entire article The soul of the dissertation is here. "Biting the ballpoint pen, Lu Zhou hit his keyboard with his fingers, compiling the outline of the dissertation, and then began to define the most critical soul for his dissertation based on the previous draft.

问题 [Question one, in order to obtain the positions of the near-moon and far-moon points of the landing preparation orbit, and the magnitude and direction of the corresponding speed of Chang'e-3, first use mechanical knowledge in combination with known conditions for calculation. Using extreme thinking, the motion of Chang'e 3 during the main deceleration phase is divided into an infinite number of uniformly variable linear motions. Use the software design program to perform iterative calculations on the main deceleration phase ...]

[Question two, in order to ensure the landing trajectory of Chang'e-3 and the optimal control strategy in six stages, the minimum fuel consumption must be the target. Based on this analysis, the parameters obtained in question one are used to identify the digital elevation using software. The algorithm of obstacles in the figure realizes the identification of obstacles and the positioning of landing points, and simulates the optimal landing trajectory by establishing a model ...]

[Analyze the error of the landing orbit control strategy designed in Problem Two. First of all, try to enumerate all the factors that may cause the error and analyze it ...]

的 Entering the state of Lu Zhou, his whole body is highly focused on the subject at hand.

When he completed the analysis of the problem, he only felt that his brain was extremely awake, and even the thought of writing the entire thesis had formed a rough frame in his mind.

The rest is to translate this outline into the language of mathematics ...

大多数 For most teams, the dissertation is usually after modeling and programming are completed, but for Lu Zhou, the two can be carried out simultaneously!

This will be their biggest advantage!