Although the whole game lasted for three days, the actual rest time was on average for ten hours on everyone, and Xu Yun and they were three rough old men, so they basically didn't bring any change of clothes.

The new dormitory school has prepared mattresses and pillows in advance, so it can be said that it is no problem to come empty-handed.

After Xu Yun and his teammates arrived, they returned to the dormitory after eating together in the evening and went to bed early to replenish their spirits.

On September 9, 2016, the Higher Education Society Cup Mathematical Modeling Competition began.

At half past seven in the morning, the special computer room prepared by the school was already full of more than a dozen participating teams.

Everyone was full of energy and calmly waiting for the official website to release the topic.

Professor He had already explained the rules in detail, and he sent them here yesterday and left directly.

Obviously, he has a lot of trust in Xu Yun and their regular army.

As for the other teachers who led the team, they went to the computer room in the morning to care for a few words and left quickly.

Seeing that it was getting closer and closer to eight o'clock, there was a tense atmosphere in the entire computer room, and no one was in the mood to chat at this time.

The gaze is firmly fixed on time.

As soon as the countdown began, everyone couldn't wait to enter the official website and download the title of this year.

According to the rules, there are four major questions in each competition, the first two are undergraduate group questions, and the last two are specialist group questions, and the participating teams need to choose one of them as the goal, and complete the modeling and programming upload within 72 hours, as well as the corresponding format of the paper.

Considering the tight schedule and heavy tasks, the participating teams will not waste too much time on topic selection.

You must quickly identify the right topic for your group.

This is also a test for the captain, and if you choose the wrong topic, it will inevitably make the next process extremely difficult.

However, the second they saw the question, their expressions instantly froze on their faces.

I only felt that my head was a little dazed, and the situation was beyond expectations.

"Question A: Design of Mooring Systems."

"Question B: The impact of community opening on road traffic."

After coming back to his senses, the computer room immediately became lively, and the sound of complaining was endless.

"This year's question is a bit perverted, one involves mechanics and the other needs analytic hierarchy process."

"It's going to be over, we don't have anyone from the Courtyard in our team."

"Which question do you choose?"

"I feel that any question is very difficult, and I already know that more research points involve mechanics."

"I suddenly regret not going to Academician Xu's public class."

……

Of course, there are also teams with excellent quality who quickly adjust their mentality and analyze and choose two questions.

For example, Zhou Qi's Zhang Xiaoyuan team.

"The design of the mooring system involves a mechanical model, Zhou Qi, how do you master this aspect?"

"I'm relatively weak in college physics, so I'm afraid it's hard to do it well." Zhou Qi answered truthfully in the face of Zhang Xiaoyuan's inquiry.

After all, he doesn't have Xu Yun's perverted learning speed, and he may have mastered the mathematics major courses well, but college physics really can't pack tickets and can't pack tickets.

After all, this concerns everyone in the group, and if you don't get realistic, you're causing trouble for everyone.

After receiving Zhou Qi's definite answer, Zhang Xiaoyuan frowned slightly, and then made a decision.

"Let's pick question B."

"Yes, I'm fine." Liu Xinning, who is in charge of programming, said.

After determining the goal, Zhou Qi no longer hesitated, and immediately studied the specific problem of the impact of open roads in the community, and tried to calculate and model.

On the other hand, Xu Yun's side was very calm.

Zhu Liyan and Zheng Yuchao are both from the Academy of Design, and they only need to be responsible for intermediate programming problems, so they basically don't help Xu Yun much in mathematical modeling, so it is up to Xu Yun to decide which problem to choose.

"Captain."

"Which question are we going to choose?"

As Zhu Liyan took the lead in asking, Xu Yun didn't hesitate and gave the answer directly.

"I have learned a lot about physical mechanics, and I have also listened to Xu Chongxing's open class on mechanics, so we chose the design of the mooring system."

This semester, in addition to studying mathematics, he also did not fall behind in physics.

Sometimes I will listen to Xu Chongxing's open classes.

Although question A seems to involve mechanics and the amount of calculation is relatively large, he is still relatively sure.

On the contrary, the impact of community opening on road traffic needs to be evaluated by analytic hierarchy and fuzzy comprehensive evaluation, which may not be very easy to model.

Whether it is Zhu Liyan or Zheng Yuchao, there will definitely be no doubts about Xu Yun's decision.

After selecting the target, they all expressed their attitudes.

"I'll leave the modeling to you, I'm afraid the two of us won't be able to help much with the mechanical model."

"But we can take care of the logistics first."

Xu Yun knew that he needed to take on the task of modeling in the first stage of the competition, and in order to buy enough time for the two of them, he also needed to complete the modeling as quickly as possible.

Then continue to work with the two of them to complete the thesis.

These divisions of labor were all established at the beginning, and Xu Yun didn't worry too much, and nodded directly to make Zhu Liyan feel at ease.

"Don't worry, I'll finish modeling as soon as possible."

Immediately immerse yourself in the topic, study the data given in the topic and the questions asked.

"The transmission nodes of the near-shallow sea observation network consist of a buoy system, a mooring system and a hydroacoustic communication system."

"The buoy system of a transmission node can be simplified to ......"

……

"Calculate the inclination angle of the steel drum and each section of the steel pipe when the sea surface wind speed is 12m/s and 24m/s respectively, and the shape of the anchor chain ......"

"Under the assumptions of the above problem, the calculated sea surface wind speed is ......"

"Please give a ...... for the design of the mooring system taking into account wind, flow and water depth"

Xu Yun studied the complete topic and knew that the first two questions should be added deliberately to help the participating students understand the problem and form ideas for modeling and solving.

Use the knowledge of mechanics to build a model, solve it and give the required results.

Determine the model length of the anchor chain and the mass of the weight ball.

Keep the buoy draft and swimming area as small as possible, as well as the angle of inclination of the steel drum.

"Model Solving by Force Analysis."

"The anchor chain steel bucket and steel pipe are both simplified into soft ropes, which are solved by using a three-section catenary that hangs heavy objects."

"The lower anchor chain is simplified to a catenary, and the steel pipe and steel drum above are treated as rigid bodies, respectively, and the balance conditions of force and moment are used to build the model."

"Furthermore, each section of the ring chain and the steel barrel and steel pipe are regarded as rigid bodies, and the force and moment balance conditions are obtained, and the discrete recursive model is given."

With his thinking quickly activated, Xu Yun quickly had a clear understanding of the problem and the idea of modeling, and after finding the right direction, he no longer delayed anything, and immediately began the derivation of the catenary equation in the first step.

This question involves a lot of data, and the amount of calculation is also very large, and under the effect of concentration, Xu Yun is completely immersed in the solution.

Relying on its own greatly improved ability to speed up the calculation process, the whole problem solving and modeling can only be said to be silky.

I didn't encounter any getting stuck in between.

On the other hand, the other participating teams in the computer room did not go so smoothly, no matter which question they chose, they were embarrassed, and the progress was very slow, and they could only watch the time pass.

Everyone knows that the shorter the time spent on modeling in the early stage, the better it will be for the programming and thesis of the subsequent teammates.

However, he has the intention to kill the thief and has no power to return to the sky.

You can only slowly refine the model like an ant crawling.

And if you want to talk about who is the most relaxed in the computer room all morning, it must belong to Zhu Liyan and Zheng Yuchao.

Originally, they still wanted to help Xu Yun a little bit, so that he could complete the modeling more easily, but they found that there was no chance for the two of them to intervene at all, thinking that it would be better to honestly play the role of logistics first than to help at that time.

All day long, they brought food and drink.

This level of relaxation contrasts sharply with the rest of the staff in the room.

If outsiders see it, I'm afraid they will think that the two of them are not participants at all.

At night, Xu Yun used all the remaining hours of deep sleep to revive himself, and after the modeling was completed, he provided suggestions and optimization solutions for Zhu Liyan and Zheng Yuchao's programming, and also completed the corresponding papers, so it can be said that he himself has carried out all the division of labor among the three of them.

Rao is Zhu Liyan and Zheng Yuchao regard Xu Yun as an idol, and they have to admire it from the bottom of their hearts when they see this situation.

is worthy of being a big guy who can go three days and three nights without sleeping, and they can't compare with this kind of spirit.

Xu Yun and his teammates have been training for so long in the summer, and they must have put in so much effort to go for the national award, and I am really sorry for this effort if they don't bring the Higher Education Society Cup back.

What's more, Professor Tang and Dean Qin also have such high expectations for him, so they must do their best.

For this reason, in the process of programming and writing papers, Xu Yun and others are also continuously optimizing the solutions of each link.

Strive for perfection.

Anyway, the Higher Education Society Cup Mathematical Modeling Competition is not about time, as long as it is uploaded within the specified time.

Xu Yun and the others didn't have the idea of handing in the papers in advance, so they wouldn't worry at all even if they deliberately slowed down the progress.

Compared with Xu Yun's team, who deliberately slowed down and tried to be perfect, most of the other teams were hurrying up, for fear that when the time came, the programming or the paper had not yet been written.

Xu Yun has experience in writing papers, and he is involved in modeling and programming, so it is not too slow.

Time is a strange concept, and when you want it to pass quickly, it tends to go by, but when you want it to go slower, it flies by.

All the participants were highly concentrated, and they completed their respective tasks intensively, and unconsciously came to the third day of the competition.

Last night, Xu Yun stayed up all night after considering that there was no time for deep sleep.

There are still about ten hours before the end of the competition, and although the thesis is nearing the end, he is also starting to lose his spirit, and the frequency of fights between his upper and lower eyelids is getting higher and higher.

Zhu Liyan and Zheng Yuchao had no task for the time being, although they did not return to the dormitory to sleep, but they stayed up all night and lasted until the third night, and they were already too sleepy to fall asleep on the table.

"The paper is still a little close, but it would be too rushed to sleep and wait for the morning to write, and I have to think of other ways."

"That's right."

Analyzing his current situation, Xu Yun quickly thought of the energy potion he had extracted earlier, and his eyes suddenly brightened.

(End of chapter)