On September 12, the competition was held as scheduled! 9月12号,竞赛如期进行！ The day before the competition, Lu Zhou and the others then travelled by the school bus to return to the old campus from the new campus, is admitted to temporary dormitory that the school authorities arranged. 在比赛的前一天,陆舟等人便搭乘校车从新校区返回了老校区,住进了校方安排的临时宿舍。 The mattress and pillow are prepare, only with the belt/bring wrap/sets list, not the tasteful person even went to individual to be good directly, although after all the playing time had 72 hours, but each person sleeping time of average, possibly ten hours. 床垫和枕头都是准备好的,只用带个套单,不讲究的人甚至直接去个人就行了,毕竟虽说比赛时间有72个小时,但平均到每个人身上的就寝时间,可能连十个小时都不到。 For example Lu Zhou is so. 比如陆舟就是如此。 His mission is most arduous, the work load that needs to complete is biggest, only then can next day resting a while, the clothes that therefore changes simply continually do not have the belt/bring, began spatially. But to the first matter of new dormitory, is on the lying down bed sleeps. 他的任务最重,需要完成的工作量最大,只有第二天可以小憩一会儿,所以干脆连换的衣服都没带,空着手就去了。而到了新宿舍的第一件事,就是躺床上睡觉。 Cannot fall asleep must compel to fall asleep. 睡不着也得逼着自己睡着。 Next morning 5 reminded, closed one's eyes on the bed to seven o'clock crookedly, went to the cafeteria to have a breakfast, Lu Zhou then and Wang Xiaodong and forest Yuxiang two people can with, went to the school for the special-purpose engine room that the mathematical modeling competition prepared together. 第二天早上五点醒了,在床上闭着眼睛歪到了七点钟,去食堂吃了个早饭,陆舟便和王晓东、林雨湘两个人会和,一起去了学校为数学建模大赛准备的专用机房。 According to the officially announced registration information, this competition has from the national 33 provinces , municipalities , and autonomous regions( including Hong Kong, Macao) and US and Singapore 1338 university 25347 team more than 70,000 university students, simultaneously clicks on the competition website, downloads the topic participation competition. 根据官方公布的报名信息,本次竞赛有来自全国33个省、市、自治区(含港澳)及美国和新加坡共1338所高校25347个队伍共7万多名大学生,同时点击竞赛网站,下载题目参与比赛。 The competition jointly is sponsored by Ministry of Education higher education Division and China industry and applied mathematics learned, because of its appraisal rigorous and fairness, its influence, although is not as good as „Challenge Cup”, but the gold content of country prize is high „Challenge Cup” has planned in certain significances. 比赛由教育部高等教育司和华国工业与应用数学学会共同主办,因其评审严谨性和公正性,其影响力虽然稍逊“挑战杯”,但国奖的含金量在某些意义上却是高过“挑战杯”一筹。 7 : 30 am, in the engine room has been filled with ten teams. 上午 7 点半,机房里已经坐满了十个队伍。 Although many people will choose to use oneself notebook answer, but under normal conditions is the computer belt/bring to the engine room. After all only then the wifi of engine room and library, can free from knowing the online downloading paper. This competition counts on through hundred degrees celsius on these without the material win of research, might as well burns burns a joss stick and other papers to complete automatically. 虽然有不少人会选择用自己的笔记本答题,但通常情况下还是会把电脑带到机房里。毕竟只有机房和图书馆的wifi,才能免费从知网上下载论文。这种比赛指望通过百度上那些未经考证的资料取胜,还不如烧一炷香等论文自动完成。 Teacher Liu transferred, greets with Lu Zhou three with a smile, without chatting the matter on competition, sent regards some „last night rested how?”, „Is the dormitory in old campus familiar with?” And so on words, then shook outside the engine room, drove the new campus to be busy at own project. 刘老师过来转了一圈,笑着和陆舟三个打了个招呼,也没聊竞赛上的事情,就问候了些“昨晚休息的怎么样？”、“老校区的宿舍习不习惯？”之类的话,然后便晃悠到了机房外面,开车回新校区忙自己的项目去了。 8 o' clock bell, a ding sound. 八点钟,钟声一响。 Everyone visited the official site rapidly, downloads the topic. 所有人迅速登陆了官网,下载题目。 According to the rule, the topic altogether is divided into the ABCD four big problems, AB is the section topic, CD is the faculty group. Each group chooses a problem to take the goal, completes and uploads in 72 hours with the md5 code that the official site software produces, and corresponded the pdf form paper of md5 code on the same day upload of conclusion competition. 根据规则,题目一共分为ABCD四道大题,其中AB属于本科组题目,CD属于专科组。每个小组选择一道题作为目标,在72小时之内完成并上传用官网软件生成的md5码,并在结束竞赛的当天上传对应md5码的pdf格式论文。 Generally speaking, the selected topic must control within a half hour, everyone race against time is reading the topic. 一般来说,选题必须控制在半个小时之内,所有人都在争分夺秒地读题。 When they see the topic the flash, everyone was scared. 然而当他们看到题目的一瞬间,所有人都傻眼了。 „A topic Chang'e-3 soft landing design trajectory and control policy...... B topic creativity plate fold table?! F*ck? What ghost is this year's topic?” “A题嫦娥三号软着陆轨道设计与控制策略……B题创意平板折叠桌？！握草？今年的题目是什么鬼？” „MMP, is completely different from the training that we make!” “MMP,和我们做的训练完全不一样！” „I had done couple days ago probably similarly, probably the launch plan of design divine land rocket...... I felt such mysterious theme definitely especially will not leave, has not thought of...... the general idea/careless!” “我前几天好像做过类似的,好像是设计神州火箭的发射方案……不过我觉得这么玄乎的题材肯定特么的不会出,没想到……大意了！” „F*ck, the big shot, aren't you high several 95? Tries to find the solution!” “握草,大佬,你不是高数九十五分吗？想想办法啊！” „What I study is tall number/count, especially how also does not study to ascend the sky!” “我学的是高数,又特么不是学怎么上天！” „Designs the table...... the table to have something to design, isn't four legs? Can fold...... us the peaceful spring behind the stool leg?” “设计桌子……桌子有什么可设计的,不就是四条腿吗？可折叠……我们在凳子腿后面安个弹簧？” In the engine room is quite lively, looks, the schoolmates were compelled by this topic entire face ignorant, is unable to start. 机房里相当热闹,看得出来,同学们都被这题目整的一脸懵逼,无从下手。 However also has the expert in inside. 不过也有高手在里面。 For example in Lu Zhou class second studies east Tyrant sleek/moist, this little while face calm and teammate exchanges low voice. 比如陆舟班上的第二学霸罗润东,这会儿正一脸淡定地和队友小声交流。 Liu Rui...... in the team of this boy as if has a very reliable thigh, this little while has read off the topic, started to give two teammate assignment work. 还有刘瑞……这小子的队里似乎有个很可靠的大腿,这会儿都已经读完题目,开始给两个队友分配工作了。 Looks the two topics of the official site downloading, Wang Xiaodong deeply frowns. 看着从官网上下载的两道题目,王晓东眉头紧锁。 The day collapses the opening. 天崩开局。 Both topics are related with the physics. 两道题目都和物理有关。 Front involves the orbital determination in aerospace physics, definitely is only insufficient by the physics in senior middle school knowledge, in the B topic surface is very simple, with ease are actually not more than first topic, related to dynamic delivery-point track to table leg, related to material analysis of accepting force wait a series of issues, related, not only the mathematical modeling knowledge, requests to the structure mechanics and material science even human engineering has certain browsing. 前面一个涉及到航天物理中的轨道计算,光靠高中物理知识肯定是不够的,B题表面上很简单,实则并不比第一题轻松太多,其中涉及到对桌腿的动态运动分析,涉及到材料受力分析等等一系列问题,涉及到的不只是数学建模知识,更要求对结构力学以及材料学甚至人体工程学有一定的涉猎。 However...... 然而…… In team „mathematical genius”, on just now big two, even just now has the physical class. 队里的“数学天才”,才刚上大二,甚至才刚开物理课。 Did not have the means that evaded the important questions for the easy. 没办法了,避重就轻。 The first physical knowledge insufficiently has no way to do completely, second can also through the network collection material, finding the way to transform the mathematical problem solution. 第一个物理知识不够完全没法做,第二个还能通过网络收集资料,想办法转化成数学问题解决。 Wang Xiaodong looks to Lu Zhou, „, or chooses the B topic?” 王晓东看向陆舟,“要不选B题？” Lu Zhou shakes the head: „Chooses the A topic.” 陆舟摇了摇头:“选A题。” „A topic?” Wang Xiaodong knits the brows, „don't you have the issue?” “A题？”王晓东皱眉,“你没问题吗？” „The words of university physics, I have completed, although the aerospace physics is seemingly complex, actually in the final analysis is also the first three chapters of contents,” stopped the moment, Lu Zhou swept side that team of one, continued, „. Moreover, you looked are only in this engine room, the person who chose the B topic are many enough.” “大学物理的话,我已经学完了,航天物理虽然看似复杂,其实归根结底也不过是前三章的内容,”停顿了片刻,陆舟扫了旁边那队一眼,继续说,“而且,你看光是这个机房里,选B题的人就已经够多了。” The AB topic is to separate the evaluation, in the A topic such scary situation, the B topic will have many candidates inevitably. At this time should put out „knew perfectly well that the mountain had the tiger, was partial to the Hushan line” the courage, left the mighty force the single-plank bridge, walked own Yangguan Avenue natural! AB题是分开评选的,在A题这么吓人的情况下,B题势必会有很多人选。这时候就该拿出“明知山有虎,偏向虎山行”的勇气,把独木桥留给千军万马,潇洒地走自己的阳关大道！ Naturally, this is also Lu Zhou in the situation , at heart to the A topic having confidence, choice that makes. 当然,这也是陆舟在心里对A题有把握的情况下,才做出的选择。 Wang Xiaodong nods unemotionally, naturally also understands the Lu Zhou last few words the meaning. 王晓东面无表情地点了点头,自然也明白陆舟最后一句话的意思。 „That line, the modeling gave you.” “那行,建模就交给你了。” „Wraps on me.” “包在我身上。” The look exchange, two study tyrants have reached the agreement. 眼神交流,两个学霸已经达成共识。 forest Yuxiang a face compels to look the teammate who ignorant two have reached the agreement, asked weakly: „That does...... have the place that what I can help?” 林雨湘一脸懵逼地看着两个已经达成共识的队友,不由弱弱地问:“那个……有什么我能帮上忙的地方吗？” Wang Xiaodong reveals him to think very gentle smiling face said that just prepared to come one „to give me to be good” charming, however has not waited for him to ferment the sentiment on that facial paralysis face, Lu Zhou of manual computation rough draft on the A4 paper, is not then lifting earnestly, said unrestrained/no trace of politeness: „Brings the food, supplied water, asks you.” 王晓东露出一个他自认为很温柔的笑容说,刚准备帅气地来一句“交给我就行了”,然而还没等他在那张面瘫脸上酝酿出感情,正埋头在A4纸上笔算草稿的陆舟,便头也不抬,毫不客气地说道:“带饭,送水,拜托你了。” The modeling, programming and paper are not short of manpower, lacks run about. 建模、编程、论文都不缺人了,就缺个跑腿的了。 Do not think that lies down to win is so good to lie down, does not make this fellow do a work, Lu Zhou is not at heart balanced. 别以为躺赢就是那么好躺的,不让这家伙干点活儿,陆舟心里不平衡。 Wang Xiaodong: „......” 王晓东:“……” forest Yuxiang does not have the complaint, has the working zeal to nod very much: „Un un, wrapped on me!” 林雨湘倒也没怨言,很有干劲地点头:“嗯嗯,包在我身上了！” The mathematical modeling and paper writing the advantage that is completed by a person are, needs two people to carry out the work that the exchange can complete, can complete by a person, does not have the teammate acts in harmony and expression understanding ability and so on problem. 数学建模和论文写作由一个人完成的好处就是,很多需要两个人进行交流才能完成的工作,可以由一个人完成,不存在队友配合默契和表达理解能力之类的问题。 Meanwhile, in a modeling paper grasping situation, can accurately to being responsible for programming Wang Xiaodong of this link to issue the order as Lu Zhou of team leader. 同时,在建模论文一把抓的情况下,作为队长的陆舟可以准确地对负责编程这一环节的王晓东下达命令。 Then, among the team members would hardly have the difference of opinion! 如此一来,队员之间几乎不会产生意见分歧！ Crosses the topic to do the information, the issue altogether has three: 越过题干信息,问题一共有三个: ( 1 ) the position of determination landing preparation track periselenium and apocynthion, and size and direction of Chang'e-3 corresponding speed. 确定着陆准备轨道近月点和远月点的位置,以及嫦娥三号相应速度的大小与方向。 ( 2 ) determines the landing tracks and in 6 stages the optimal control strategies of Chang'e-3. 确定嫦娥三号的着陆轨道和在六个阶段的最优控制策略。 ( 3 ) you design makes the corresponding error analysis and sensitivity analysis regarding the landing track and that the control policy. 对于你们设计的着陆轨道和控制策略做相应的误差分析和敏感性分析。 „Abstract partially is to the summary of full text, part can put after the entire chapter article finished completes. The key point is the issue iterates the later problem analysis, related to the complete mentality of entire modeling, the soul of entire chapter paper here.” Bites the ball pen, the Lu Zhou finger is typing on the keyboard, compiles the program of paper, then starts according to the previous manual computation rough draft, starts to give his paper to define the most essential soul. “摘要部分是对全文的总结,这一部分可以放于整篇文章都写完后完成。重点是问题重述之后的问题分析,涉及到整个建模的全部思路,整篇论文的灵魂就在这里。”咬着圆珠笔,陆舟手指敲打键盘,将论文的大纲编写出来,然后开始根据先前笔算的草稿,开始给他的论文定义最关键的灵魂。 【Issue one, for has been landed to prepare the position of orbital periselenium and apocynthion, and size and direction of Chang'e-3 corresponding speed, first calculate using the mechanics knowledge union datum. Using limit thought that the motion segmentation of Chang'e-3 main deboost phase infinite uniformly accelerated motion. Using the Matlab software design procedure/program, conducts the iterative computation to the main deboost phase......】 【问题一,为了得到着陆准备准备轨道近月点和远月点的位置,以及嫦娥三号相应速度的大小与方向,首先运用力学知识结合已知条件进行计算。利用极限思维,将嫦娥三号主减速阶段的运动分割成无限个匀变速直线运动。利用Matlab软件设计程序,对主减速阶段进行迭代运算……】 【Issue two, to guarantee the landing tracks and in 6 stages the optimal control strategies of Chang'e-3, must aim at fuel consumption to be smallest, analyzes based on this, using parameter that issue obtains, uses in Matlab software character recognition DEM the algorithm of obstacle, realizes localization to the recognition and touchdown target of obstacle, and through model building simulation optimal landing track......】 【问题二,为了确保嫦娥三号的着陆轨道和在六个阶段的最优控制策略,必须以燃料消耗最小为目标,在此基础上进行分析,运用问题一得到的参数,利用Matlab软件识别数字高程图中障碍物的算法,实现对障碍物的识别和着陆点的定位,并通过建立模型模拟最优着陆轨道……】 【The error of landing on-orbit control strategy analysis issue in two designs, must first enumerate all possibly to cause factor that error has as far as possible, analyzes to it......】 【分析问题二中设计的着陆轨道控制策略的误差,首先要尽可能列举出所有可能导致误差产生的因素,对其进行分析……】 Enters the condition Lu Zhou, the wholeheartedly high degree of concentration in the present topic. 进入状态的陆舟,全身心高度集中在了眼前的课题上。 When completed to the instance of problem analysis, he only thought that oneself brain is very sober, even had formed an approximate frame to the issue document mentality of entire paper in the mind. 当完成了对问题分析的瞬间,他只觉得自己的大脑无比清醒,甚至于对整个论文的行文思路已经在脑海中形成了一个大致的框架。 The remaining work, then this program, translate the language of math...... 剩下的工作,便是将这份大纲,翻译成数学的语言…… Regarding most teams, after the paper places generally the modeling and programming are completed, but regarding Lu Zhou, both can actually synchronously conduct! 对于大多数队伍而言,论文一般是放在建模和编程完成之后,但对于陆舟来说,两者却是可以同步进行的！ This will become the biggest advantage of their team! 这将成为他们队伍的最大优势！