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任务书学院专业论文题目温室卷帘机构设计（机械部分设计）学生姓名学号起讫日期指导教师姓名（签名）指导教师职称指导教师工作单位院（系）领导签名下发任务书日期年月日题目温室卷帘机构设计（机械部分设计）论文时间课题的主要内容及要求含技术要求、图表要求等大体思路是设计一种启动装置能与卷轴同步升降的自驱动卷帘机。其具体要求为1透明覆盖物的选择聚氯乙烯PVC棚膜聚乙烯PE棚膜乙烯醋酸乙烯共聚物EVA农膜2卷轴设计卷帘轴的作用是固定幕帘下端,使其能整体卷放3电动机的选择与计算电动机的类型,电动机容量和转速要合适4减速器的设计5轴承选择及验算,轴键校核和计算机控制设计6具有同步升降装置。课题的实施的方法、步骤及工作量要求1查阅有关资料和设计手册，了解国家或行业对卷帘机构设计的要求等；2确定试验方案，拟定满足试验要求的卷帘机构原理图；3确定卷帘结构设计方案，完成总装配图及零件图，完成图纸工作量累计3张零号图纸以上；4完成外文翻译汉字5000字以上；5完成毕业设计说明书（1万汉字以上）。指定参考文献1周长吉主编现代温室工程北京化学化工出版社,20032王耀林等主编设施园艺工程技术郑州河南科学技术出版社,2000,103刘步洲等主编蔬菜塑料大棚的机构和性能上海上海科学技术出版社,198294冯广和主编设施农业技术北京气象出版社,1997125尚书旗董佑福等设施栽培工程技术北京中国农业出版社,P189,1999126贡月玲等几种不同形式的温室保温覆盖卷帘机设施园艺，2000年第4期7赵树朋等日光温室单轴牵引型卷帘机设计石家庄河北农业大学学报，2002第25卷第4期8胡跃高农业总论【M】北京中国农业大学出版社，20009PHYSICALMODELINGOFNATURALVENTILATIONTHROUGHSCREENSANDWINDOWSINGREENHOUSESJAGRICEGGNOGREES199870,165176,ARTICLENUMBERAG97026210濮良贵纪名刚机械设计北京高等教育出版社，200111王世刚，张春，徐起贺机械设计实践哈尔滨哈尔滨工业大学出版社，200112吴宗泽机械设计实用手册北京中央广播电视大学出版社，199813刘鸿文材料力学北京高等教育出版社，199114甘永力几何量公差与检测上海上海科学技术出版社，2001415西北工业大学工程制图教研室编画法几何及机械制图西安陕西科学技术出版社，1998毕业设计论文进度计划以周为单位第1周（2013年2月25日2013年3月3日）检查寒假外文翻译情况，下达具体毕业设计任务，指导学生撰写开题报告，熟悉设计内容，查阅有关资料第2周第3周（2013年3月4日2013年3月17日）参观实验室或有关厂家，增加感性认识，方案论证并确定设计方案，完成卷帘机构装配图、零部件设计及有关设计计算第4周第5周（2013年3月18日2013年3月31日）完成卷帘机机械部分的设计方案，拟定卷帘机设计草图第6周第7周（2013年4月1日2013年4月14日）完成卷帘机设计总图及有关零件设计图第8周（2013年4月9日2013年4月21日）提交第18周的指导记录表、实习报告和已做的毕业设计内容，由指导老师初审后上交学院第9周第13周（2013年4月22日2013年5月26日）在指导老师指导下修改并完成设计，完成相关设计图纸，同时撰写毕业设计说明书，并提交指导老师初审第14周第16周（2013年5月27日2013年6月14日）修改毕业设计图纸及说明书，完成后参加毕业答辩备注注表格栏高不够可自行增加。此表由指导教师在毕业设计（论文）工作开始前填写，每位毕业生两份，一份发给学生，一份交院（系）留存。JAGRICENGNGRES199870,165176ARTICLENUMBERAG970262PHYSICALMODELLINGOFNATURALVENTILATIONSCREENSANDWINDOWSINGREENHOUSEWEUSEACOMBINATIONOFPRACTICEANDTHEORYRESEARCHONGREENHOUSEVENTILATIONEQUIPMENT,ISTOSTUDYGREENHOUSESHUTTERANDWINDOWSSERVICELIFEOFTHEDEVICEUNDERLOWPRESSUREANDUNDERDIFFERENTWINDANDPRESSUREFLUCTUATIONSTHESEFLUCTUATIONSASSOCIATEDWITHTHEMEANWINDSPEED,AVERAGEWINDSPEEDSAREOBTAINEDBYENERGYSPECTRUMANALYSISITFOLLOWSTHATAPRESSUREASSOCIATEDWITHTHEMEANWINDSPEED,ANDESTIMATIONOFGASTURBULENCEONMEANWINDSPEEDHASABIGIMPACTSTARTTHEPOTENTIALRELATIONSHIPSBETWEENGREENHOUSEVENTILATIONEQUIPMENTANDISBASEDONTHEGROUNDBREAKINGRESEARCHOFFLUIDMACHINERYONAIRFLOWANDAIRPRESSUREANDTEMPERATURECORRESPONDTOCHANGETHISPREDICTIONCORRESPONDSWITHDATAFROMEXPERIMENTAL,BYANDLARGE,THEDIFFERENCEBETWEENTHEMISLESSTHAN20NOTATIONAAREA,M2ZHEIGHT,MCCCOEFFICIENTACCOUNTINGFORCONVECTIVEEFFECTZ0SURFACEROUGHNESSLEGTH,MCKLKOLMOGOROVCONSTANT（05）CWFFRICTIONCOEFFICIENTGREEKSYMBOLCUTURBULENTKINETICENERGYCONSTANTWINDOWANGLEBETWWENTHEFLAPOFWINDOWANDTHEFRAME,DEGFNPOWERSPECTRALDENSITY，M2/SCONFFICIENTOFTHERMALEXPANSIONGGRAVITATIONALACCELERATION，M/SSPOROSITYHHEIGHT，MKVONKARMANSCONSTANT（04）HCHARACTERISTICDEPTH，MDYNAMICVISCOSITY,NS/M2LCHARACTERISTICLENGTH，MWINDPRESSURECOEFFICIENTNFREQUENCY，HZPPRESSUREOFAIR，PAP0MEANABSOLUTEPRESSUREOFAIRINENCLOSURE，PAPSTSTACKPRESSURE，PASUBSCRIPTSPWWINDPRESSURE，PAFRFLOWFIELDQAIRFLOW，M3/SIINSIDERUTURBULENTKINETICENERGYDISSIPATIONRATE,M2/SLLARGERLENGTHTABSOLUTETEMPERATURW，KRMSWROOTMEANSPUREWINDVELOCITYUFLAIDVELOCITY,SSMALLERLENGTHUFRICTIONVELOCITY，M/SSTSTACKVVOLUMEWWINDYINERTIALFACTOR1INTRODUCTIONNATURALVENTILATIONOFGREENHOUSEISANEXTREMELYCOMPLEXPROCESS,ALLPARAMETERSOFTHISPROCESSDEPENDSONTHEGREENHOUSERATEDVALUE,LOCATIONANDGEOMETRYOFTHEWINDOWASWELLASLEAKAREAS,ANDSOONANDTHEEXTERNALENVIRONMENTALCONDITIONSTHISPHENOMENONCONTINUEDINTERESTCANCAUSENATURALVENTILATIONINMASSANDENERGYIMBALANCESANDFURTHERSERIOUSEFFECTSOFINDOORENVIRONMENTSSINCE1954,MORRISANDNEALE1FIRSTONNATURALVENTILATIONINGREENHOUSEVENTILATIONEQUIPMENTFOREXPERIMENTALSTUDIES,ITISINCREASINGLYTAKINGINTOACCOUNTTHEPOTENTIALPHYSICALEFFECTSONVENTILATIONEQUIPMENTAFEWDECADESLATER,BAIELY2ANDCOTTON3,ANDMIGUEL,ALONGWITH4OTHEREXPERIMENTSDEMONSTRATEDTHEPLANTANDGREENHOUSEROOFWITHSUNSHADENETPOTENTIALBENEFITSINRECENTTIMES,INTHEFENESTRATIONEQUIPMENT5CURTAINISINORDERTOPREVENTTHEENTRYOFINSECTS,THEREBYREDUCINGUSEOFCHEMICALPESTICIDESSO,RESEARCHONSURFACEAIRCURTAINISALSOANIMPORTANTISSUEEXISTINGONTHESUBJECTOFANALYSISMETHODSCANBEBROADLYCLASSIFIEDINTOTHEFOLLOWINGTWOWAYS1THEEMPIRICISMANDSEMIEMPIRICALMETHODSOFRESEARCHSTUDIESONAIRFLOWTHROUGHTHE613ANDCURTAIN25142GUIDEDBYTHEFLUIDMECHANICALFORMULASOFDIGITALSOLUTIONS1517BELONGSTOTHEFIRSTTYPEOFALLMODELSBASEDONTHETHEORYTHATTHEMOVEMENTOFAIRDRIVENAIRCIRCULATIONBETWEENTHEPOTENTIALOFTHEREISASIMPLELINEARRELATIONSHIPTHISANALYSISFINDSTHATTHEGREENHOUSESOFINDOORAIRISNOTCOMPRESSED,PLAINPIECESOFTHISANALYSISORBASEDONEXPERIENCEDERIVEDFROMTHEBERNOULLIEQUATIONDESPITETHESIMPLEASSUMPTIONTHATINCONJUNCTIONWITHSPECIFICEXPERIMENTSUNDERTHECORRECTIVECOEFFICIENT,ISALSOGREATLYLIMITSTHERANGEOFTHESTUDYRESULTSINTHESECONDMODEL,USINGADIGITALSIMULATIONPROGRAMTOSOLVETHEEQUATIONOFINERTIA,MOMENTUMANDENERGYEQUATIONS,DECISIONSPEED,TEMPERATUREANDPRESSURE,ANDEVENTUALLYAIRCIRCULATIONPATTERNSWITHINTHEGREENHOUSEDESCRIBEDINTHISSTUDYARETWOFOLD1UNDERSTANDINGOFAIRFLOWTHROUGHTHESHUTTERWITHHOLESINSULATION,SHADING,PESTCONTROLANDPHYSICALPROPERTIESOFSKYLIGHTSINTHEEXCHANGEMOREIMPORTANTDEALSWITHSHUTTERANDSKYLIGHTWITHHO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WITHTHELAWOFKOLMOGOROVSIMILARACCESSTOWINDWARDANDLEEWARDWINDENERGYSPECTRUMTWOMAJORFLUCTUATIONSINTHEENERGYSPECTRUMATFREQUENCIESBELOW01,02HZOFTHEHIGHESTPOINT,MOREFREQUENTLYTHAN1HZNOTHINGSPECIAL,LOWFREQUENCYDOMAINDOMINATEDBYTHEWINDINFACT,THEWINDSPEEDINTHEMAJORENERGYVORTEXINTHELOWFREQUENCYRANGEPROVINGTHEKAIMALBOT8AND26RESEARCHTHEORYPARAMETERCANBEFIGURE5FIGURE6ENERGYSPECTRALDENSITYANDFREQUENCYVALUESCALCULATEDCALCULATIONOFSURFACEROUGHNESS004M22,RESULTSASSHOWNINTABLE142THROUGHTHECURTAINANDWINDOWAIRTOFLOWJUSTASCAUSEDBYTHETEMPERATUREDIFFERENCETHATIS,FORSTABLETEMPERATURECONDITIONSQ/T0ASDEPICTEDINTHEFIGURE7ANDFIGURE8PW0FIGURE7AIRTHROUGHTHESHUTTERCORRESPONDINGTOTHEFORMULA2AND4BUDGETROLLINGTEMPERATUREDIFFERENCEMEASUREMENTDATAFIGURE8AIRTHROUGHTHERECTANGULARSLITSHUTTERCENTRECORRESPONDSTOTHEFORMULA3AND4BUDGETROLLINGTEMPERATUREDIFFERENCEMEASUREMENTDATAASSHOWNINFIGURE7TOAIRTHROUGHTHESHUTTERCORRESPONDINGTOTHEFORMULAINTHEEXPERIMENT2AND4SHUTTERTEMPERATUREDIFFERENCEOFTHEBUDGETFIGURE8SHOWSTHEEXPERIMENTINTHEAIRTHROUGHTHERECTANGULARSLITSHUTTERCENTRECORRESPONDSTOTHEFORMULA3AND4SHUTTERTHETEMPERATUREDIFFERENCEOFTHEBUDGETSCAUSEDBYAIRFLOWJUSTBECAUSETHEWINDSPEED0,ASSHOWNINFIGURE911INTHEDIAGRAM,AIRTHROUGHTHESKYLIGHTORCURTAINANDPOROUSPARTITIONBYTHEFORMULA2VALUEOFTHESKYLIGHTBYTHEFORMULA3CORRESPONDSTOTHEVALUEFIGURE9PREDICTIONOFAIRTHROUGHTHEWINDWARDANDTHELEESIDEOWITHTHEWINDWARDRELATIVEPRESSUREWINDOW4OFIGURE10PREDICTIONOFAIRTHROUGHTHEWINDWARDANDTHELEESIDEO,ASOPPOSEDTOTHELEESIDEOFPRESSUREOPENTHEWINDOW4OFIGURE11PREDICTTHERELATIVEPRESSUREOFAIRTHROUGHTHEBARRICADESANDWINDWARDANYONEWINDOWOPEN,WINDOW20OWINDWARD,THELEESIDEOFIGURE12FORECASTAIRFLOWTHROUGHCLAPBOARDCENTERNARROWSEWINGANDUPWINDSURFACEOFRELATIVEPRESSUREANYSURFACEHASAFANWINDOWOPEN,OPENEDWINDOWDEGREESFOR20OUPWINDSURFACE,LEEWARDSURFACEOFIGURE9BYSHOWSFOREXPERIMENTALINTHEFORECASTAIRFLOWTHROUGHUPWINDSURFACEANDLEEWARDSURFACEOSHIANDUPWINDSURFACEOFRELATIVEPRESSUREOPENEDWINDOWDEGREESFOR4OFIGURE10BYSHOWSFOREXPERIMENTALINTHEFORECASTAIRFLOWTHROUGHUPWINDSURFACEANDLEEWARDSURFACEOSHIANDLEEWARDSURFACEOFRELATIVEPRESSUREOPENEDWINDOWDEGREESFOR4OFIGURE11SHOWSTHEEXPERIMENTALFORECASTRELATIVEPRESSUREOFAIRTHROUGHTHEBARRICADESANDWINDWARDGREENHOUSEINTHEWINDWARDORLEEWARDSIDEOFAWINDOWYOUWANTTOOPENWINDOW20OFIGURE12SHOWSTHESLITANDEXPERIMENTALCENTERFORFORECASTINGAIRTHROUGHTHECLAPBOARDWINDWARDRELATIVEPRESSUREGREENHOUSEINTHEWINDWARDORLEEWARDSIDEOFAWINDOWYOUWANTTOOPENWINDOW20OFIGURE7ANDFIGURE11DEPICTSDUETOTEMPERATURE,THEWINDFIELDDRIVINGAIRTHROUGHTHEHOLESINCLAPBOARD,WHICHSHOWEDTWODIFFERENTKINDSOFFLUCTUATIONSDARCYFLUCTUATIONSFIGURE7ANDFORCHHEIMERFLUCTUATIONSFIGURE11THESEFINDINGSDUETOBEAR,BACHMAT19ANDBAILEY2REYNOLDSDATAREUKP1/2/ISLESSTHANTHEOVERALLVALUE,THEFLOWANDPROMOTEPOTENTIALPROPORTIONALTOTHEGREENHOUSEANDNORMALAMBIENTAIRTEMPERATURERANGET25KREYNOLDSWHENTHEDATAISLARGERTHANTHEOVERALLVALUE,MUSTBEADDEDTOAIRSECONDFORCHHEIMERFLUCTUATIONS,THATIS,WHENVOLATILITYISDETERMINEDBYTHEWINDSPEEDISHIGHERTHAN025M/SEXPERIMENTALGASVALUECOMPAREDWITHTHEFORECASTFLOWEQUIVALENTTOTHEVALUEOFTHEMODELANDTHERESULTINGERRORISALWAYSLESSTHANTHE20,BEYONDTHEFIGURE12DIAGRAMSHOWSMOSTOFTHEDISPERSIONVALUEISATTRIBUTABLETOAIRTHROUGHCRACKS,THEAIRFLOWISSUBTRACTEDFROMTHETOTALAMOUNTOFVOLATILITYFLUCTUATIONSOBTAINEDTHROUGHTHECLAPBOARDBECAUSETHEREISLITTLEDIFFERENCE,SOERRORISVERYLARGE5CONCLUSION1FORVENTILATIONDEVICES,ENERGYPLAYSANIMPORTANTROLEWITHINTHEVORTEXISLESSFREQUENTLYTHAN0102HZCAUSEDBYTURBULENTWINDSPEEDS2ITISESTIMATEDTHATTHISTURBULENTWINDS13PERCENTOFTHEMEANWINDSPEED,WHICHMEANSTHATOCCUPYANIMPORTANTPOSITIONINTHETOTALAIRPRESSURE3DESCRIPTIONTHEAIRTHROUGHHOLESINCLAPBOARDCONCENTRATIONOFHOLESINCLAPBOARDMIDDLEHOWEVER,FORAROUNDTHEGREENHOUSEANDAIRFLOWSURGESTHATARECAUSEDBYTHETEMPERATUREDIFFERENCEWITHINTHENORMALRANGE,SECONDARYAIRFLOWWHICHMAYBEIGNORED,SOEQUATIONABBREVIATIONINTOTHELAWOFDARCYMUKP1QAP/HP4THROUGHTHETHEORETICALPREDICTIONOFAIRFLOWTHROUGHTHEBAFFLEANDVENTWITHTHEEXPERIMENTALVALUESWERECLOSE,LARGELYTHEDIFFERENCEBETWEENTHEMISLESSTHAN20REFERENCE1MORRISLGNEALFETHEINFRAREDCARBONDIOXIDEGASANALYZERANDITSUSEINGREENHOUSERESEARCHNATIONALINSTITUTEOFAGRICULTURALENGINEERINGREPORT，SILSOE，UNITEDKINGDOM，19542BAILEYBJGLASSHOUSETHERMALSCREENSAIRFLOWTHROUGHPERMEABLEMATERIALSDEPARTMENTALNOTENODN/G/859/04013NATIONALINSTITUTEOFAGRICULTURALENGINEERING,SILSOE,UNITEDKINGDOM,19783BAILEYBJCOTTONRFGREENHOUSETHE
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