美赛优秀论文

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1、TheDesignofSnowboardHalfpipeAbstract:Basedonthesnowboardmovementtheory,theflightheightdependsontheout-velocity.Wetakethetechnicalparametersoffoursitesandfiveexcellentsnowboardersforstatisticalanalysis.Asresultsshowthatthesizeofhalfpipe(length,widthanddepth,halfpipeslope

2、)influencethein-velocityandout-velocity.Helpramp,theanglebetweenthesnowboard'sdirectionandspeedaffectvelocity'sloss.Forthehalfpipe,weestablishedthedifferentialequationmodel,basedonweight,friction,airdensity,resistancecoefficient,theareaofresistance,andotherfactorsandthe

3、lawofenergyconservation.themodel9sresultsshowthatthesnowboarders9energylosefromfouraspects(1)theanglebetweenthedirectionofsnowboardandthespeed,whichformedbecauseoftheexistinghalfpipe(2)Thefrictionbetweensnowboardandthesurface(3)theairbarrier(4)thecollisionwiththewallfor

4、gettingverticalspeedbeforeslipingoutofhalfpipe.Therefore,weputforwardanimprovingmodelcalledL-halfpipe,soastoeliminateorreducetheanglebetweenthesnowboardandthespeed.Smallerradiuscanalsoreducetheenergyabsorptionbythewall.Atlast,weputforwardsomeconceptiontooptimizethedesig

5、nofthehalfpipeintheperspectiveofsafetyandproducingtorsion.Keywords:snowboard;halfpipe;differentialequationmodel;L-halfpipeContents1.Introduction3简介1.1theoriginofthesnowboardcourseproblems3滑雪课程的起源问题。1・2thebackground3背景2・TheDescriptionofProblem3问题的描述2.1Practicalhalfpipe's

6、requirements3实用halfpipe的需求2.1.1themaximumverticalandthelargestbodytwist3最大垂宜和最大的身体扭曲2.1.2Speedanalysis3速度分析2.2Halfpipe'sownconditions4HalfpipeH身的条件2.2.1Friction4摩擦2.2.2thesizeofhalfpipe4halfpipe的大小3・Model4模型3.1DefinitionsandSymbols4定义和符号3.2Assumptions5假设3.3thesimpleanal

7、ysisofgravityandfrictionwhenslidinginthehalfpipe5简单的分析重力和摩擦力的halfpipe时滑动3.4in-velocityoffactors6速度的因素3.4.1thesnowboarder5anglewheninandthespeedloss6滑雪在角和速度上的损失3.5out-velocityoffactors8初速度的因素3.5.1Helpramp8帮助坡道3.5.2theforcepointandtheplateanglewhenout9力的点和板和3.5.3thesnowbo

8、arder9anglewhenoutandthespeedloss9滑雪在角和速度上的损失3.5.1Halfpipe'sRadius11Halfpipe的半径3.1thein-velocitycomparisonwith