Although the entire competition lasted three days, the actual rest time for each person was probably less than ten hours on average. In addition, Xu Yun and the others were three rough men, so they hardly brought any change of clothes.
The school has prepared mattresses and pillows for the new dormitory in advance, so it can be said that it is no problem to come empty-handed.
After Xu Yun and his teammates arrived, they had dinner together in the evening and then returned to the dormitory to go to bed early to replenish their energy.
On September 9, 2016, the Higher Education Society Cup Mathematical Modeling Competition began.
At 7:30 in the morning, the special computer room prepared by the school was already filled with more than a dozen participating teams.
Everyone was full of energy and calmly waiting for the official website to release the questions.
Professor He had already introduced various rules in detail and left immediately after delivering them yesterday.
Obviously they have great trust in Xu Yun and his regular army.
As for the other leading teachers, they went to the computer room in the morning to express a few words of concern and then left quickly.
Seeing that it was getting closer and closer to eight o'clock, there was a tense atmosphere in the entire computer room. At this time, no one was in the mood to chat.
His eyes were firmly fixed on time.
As soon as the countdown started, everyone couldn't wait to enter the official website and download the questions for this session.
According to the rules, there are four major questions in each competition. The first two questions are for the undergraduate group, and the last two are for the junior college group. The participating teams need to choose one of them as the goal and complete the modeling and programming upload within 72 hours. , and papers in corresponding formats.
Often considering that time is tight and tasks are heavy, participating teams will not waste too much time on topic selection.
You must quickly identify topics that are suitable for your group.
This is also a test for the captain. If you choose the wrong topic, the next process will definitely become extremely difficult.
However, the moment they saw the title, their expressions instantly froze on their faces.
I just feel like my head is a little dazed, and the situation is beyond expectations.
"Design of mooring system for Question A."
"The impact of the opening of Title B community on road traffic."
After coming back to his senses, the computer room immediately became lively, and the voices of complaints were endless.
"This year's questions are a bit weird. One involves mechanics and the other requires analysis level analysis."
"If we're going to die, we don't have anyone from the Academy in our team."
"Which question should I choose?"
"Every question seems to be very difficult. I wish I could have studied more questions involving mechanics."
"Suddenly I regretted not attending Academician Xu's open class."
…
Of course, there are also highly qualified teams who quickly adjust their mentality and analyze and choose between the two questions.
For example, Zhou Qi’s Zhang Xiaoyuan team.
"The design of the mooring system involves mechanical models. How good is your grasp of this aspect, Zhou Qi?"
"I am weak in college physics, I'm afraid it will be difficult to do well." Zhou Qi answered Zhang Xiaoyuan's question truthfully.
After all, he doesn't have Xu Yun's abnormal learning speed. He may have a good grasp of mathematics courses, but there is really no guarantee of college physics.
After all, this concerns everyone in the entire group. If you fail to seek truth from facts, you are causing trouble for everyone.
After receiving Zhou Qi's definite answer, Zhang Xiaoyuan frowned slightly and then made a decision.
"We choose question B."
"Okay, I have no objection." Liu Xinning, who is in charge of programming, said.
After setting the goal, Zhou Qi no longer hesitated and immediately began to study the specific issue of the impact of open roads in the community, trying to calculate and model.
On the other hand, Xu Yun was very calm.
Zhu Liyan and Zheng Yuchao both came from the Institute of Planning and Design, and were only responsible for intermediate programming issues, so they were not of much help to Xu Yun in terms of mathematical modeling. Therefore, it was left to Xu Yun to decide which question to choose.
"team leader."
"Which question should we choose?"
As Zhu Liyan took the lead in asking, Xu Yun gave the answer without any hesitation.
"I have learned a lot about physical mechanics and also listened to Xu Chongxing's open courses on mechanics, so we chose the design of the mooring system."
In addition to studying mathematics courses this semester, he also did not fall behind in physics.
Sometimes I would attend Xu Chongxing’s open classes.
Although question A seemed to involve mechanics and required a lot of calculations, he was still relatively confident.
On the contrary, the impact of community opening on road traffic requires hierarchical analysis and fuzzy comprehensive evaluation, which may not be very easy when modeling.
Neither Zhu Liyan nor Zheng Yuchao will doubt Xu Yun's decision.
After selecting the target, they all expressed their opinions.
"Then I'll leave the initial modeling to you. I'm afraid the two of us can't help much with the mechanical model."
"But we can ensure the logistics first."
Xu Yun knew that he would need 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 cooperate with the programming of the two of them to complete the thesis.
These divisions of labor were established from the beginning, so Xu Yun didn't worry too much and just nodded to reassure Zhu Liyan and the others.
"Don't worry, I will complete the modeling as soon as possible."
After speaking, immediately immerse yourself in the topic and study the data given in the topic and the questions raised.
"The transmission node of the near-shallow sea observation network consists of a buoy system, a mooring system and a hydroacoustic communication system."
"The buoy system of a certain transmission node can be simplified as..."
…
"Calculate the inclination angle of the steel barrel and each steel pipe section, and the shape of the anchor chain when the sea surface wind speed is 12m/s and 24m/s respectively..."
"Under the assumptions of the above problem, the calculated sea surface wind speed is..."
"Please give the design of the mooring system taking into account wind, current and water depth..."
Xu Yun studied the complete question and knew that the first two questions should be added deliberately to help participating students understand the problem and form ideas for modeling and solving.
Use mechanical knowledge to build a model and solve it to give the required results.
Determine the model length of the anchor chain and the mass of the weight ball.
Keep the draft and swimming area of the buoy and the inclination angle of the steel drum as small as possible.
"Building model solutions through force analysis."
"Simplify the steel barrels and steel pipes of the anchor chain into soft ropes, and use three sections of suspension chains to hang heavy objects to solve the problem."
"The lower anchor chain is simplified as a catenary line, and the upper steel pipe and steel barrel are treated as rigid bodies respectively, and the model is established based on the equilibrium conditions of force and moment."
"Further, each link chain and steel drum steel pipe is regarded as a rigid body, the force and moment balance conditions are obtained, and a discrete recursion model is given."
With his fast and active thinking, Xu Yun quickly figured out the ideas for solving the problem and modeling. After finding the opponent, he stopped delaying and immediately started the first step of derivation of the catenary equation.
This question involves a lot of data and requires a lot of calculations. With concentration, Xu Yun was completely immersed in the answer.
Relying on its greatly improved ability to speed up the calculation process, the entire problem solving and modeling can only be said to be silky smooth.
Didn't encounter any jams in the middle.
On the other hand, the other participating groups in the computer room did not go so smoothly. No matter which question they chose, they were all embarrassed. The progress was very slow and they could only watch the time pass.
Everyone knows that the shorter the time spent on early modeling, the more conducive it is to subsequent teammates’ programming and papers.
However, he was determined to kill the thief but was unable to save his life.
We can only slowly improve the model like an ant crawling.
And who had the most relaxed time in the computer room throughout the morning, it was definitely Zhu Liyan and Zheng Yuchao.
Originally, they were thinking about giving Xu Yun some help so that he could complete the modeling more easily. However, they found that there was no chance for them to intervene at all. They thought that rather than being unhelpful at that time, they might as well act as logistics first. Better.
We brought food and drinks all day long.
This level of relaxation is in sharp contrast to other people in the computer room.
If outsiders saw it, they would probably think that they were not contestants at all.
At night, Xu Yun used all the remaining hours of deep sleep to resurrect himself with full blood. After the modeling was completed, he provided suggestions and optimization plans for Zhu Liyan and Zheng Yuchao's programming. In addition, he also had to complete the corresponding thesis, so he could He said that he himself was responsible for all three people's division of labor.
Although Zhu Liyan and Zheng Yuchao regarded Xu Yun as their idol, they had to admire him from the bottom of their hearts when they saw this.
He is worthy of being a boss who can stay up for three days and three nights. This level of energy is incomparable to them.
Xu Yun and his teammates have been training for such a long time during the summer vacation and have put in so much effort for the national award. It would be a shame not to win the Higher Education Society Cup.
What's more, Professor Tang and Dean Qin also have such high expectations for him, so he must do his best.
To this end, during the process of programming and writing papers, Xu Yun and the others also continued to optimize the answers to each link.
Strive to be the most perfect.
Anyway, the Higher Education Society Cup Mathematical Modeling Competition is not about time, as long as you upload it within the specified time.
Xu Yun and the others had no intention of handing in the paper in advance, so even if they deliberately slowed down the progress, they would not worry at all.
Compared with Xu Yun's team, which deliberately slowed down and strived for perfection, most of the other teams worked faster, fearing that the time would come when the programming time was up or the paper had not yet been written.
Xu Yun has experience in writing papers, and he is also involved in modeling and programming, so the progress is not too slow.
Time is a very strange concept. When you want it to go by faster, it will often pass by like years. On the contrary, when you want time to go slower, it will pass quickly again.
All participants were highly concentrated and completed their respective tasks intensively. Unknowingly, the third day of the competition came.
Last night, Xu Yun stayed up all night after considering that there was no time for deep sleep.
There are still about ten hours left before the end of the competition. Even though the paper is coming to an end, he is also starting to become depressed, and his upper and lower eyelids are fighting more and more frequently.
Zhu Liyan and Zheng Yuchao were temporarily out of work. Although they did not return to the dormitory to sleep, they stayed up all night and continued until the third night. They were already so sleepy that they fell asleep on the table.
"The paper is still a little bit finished, but it would be too late to go to bed and wait until early morning to write it now. I have to think of other ways."
"correct."
Analyzing his current situation, Xu Yun quickly thought of the energy potion he had extracted earlier, and his eyes suddenly brightened.
(End of chapter)
