外文翻译 zigbee检测探头在冷藏蔬菜运输现实条件下的测试大学论文Word文件下载.docx
- 文档编号:14765230
- 上传时间:2022-10-24
- 格式:DOCX
- 页数:12
- 大小:102.96KB
外文翻译 zigbee检测探头在冷藏蔬菜运输现实条件下的测试大学论文Word文件下载.docx
《外文翻译 zigbee检测探头在冷藏蔬菜运输现实条件下的测试大学论文Word文件下载.docx》由会员分享,可在线阅读,更多相关《外文翻译 zigbee检测探头在冷藏蔬菜运输现实条件下的测试大学论文Word文件下载.docx(12页珍藏版)》请在冰豆网上搜索。
10128
学号:
本科毕业设计
外文文献及翻译
(
英文题目:
TestingZigBeeMotesforMonitoringRefrigeratedVegetableTransportationunderRealConditions
中文题目:
ZigBee检测探头在冷藏蔬菜运输现实条件下的测试
学生姓名:
学院:
信息工程学院
系别:
电子信息工程
专业:
班级:
指导教师:
教授
二〇一年月
Abstract
Qualitycontrolandmonitoringofperishablegoodsduringtransportationanddeliveryservicesisanincreasingconcernforproducers,suppliers,transportdecisionmakersandconsumers.Themajorchallengeistoensureacontinuous„coldchain‟fromproducertoconsumerinordertoguarantyprimeconditionofgoods.Inthisframework,thesuitabilityofZigBeeprotocolformonitoringrefrigeratedtransportationhasbeenproposedbyseveralauthors.However,uptodatetherewasnotanyexperimentalworkperformedunderrealconditions.Thus,themainobjectiveofourexperimentwastotestwirelesssensormotesbasedintheZigBee/IEEE802.15.4protocolduringarealshipment.Theexperimentwasconductedinarefrigeratedtrucktravelingthroughtwocountries(SpainandFrance)whichmeansajourneyof1,051kilometers.Thepaperillustratesthegreatpotentialofthistypeofmotes,providinginformationaboutseveralparameterssuchastemperature,relativehumidity,dooropeningsandtruckstops.Psychrometricchartshavealsobeendevelopedforimprovingtheknowledgeaboutwaterlossandcondensationontheproductduringshipments.
1.Introduction
Perishablefoodproductssuchasvegetables,fruit,meatorfishrequirerefrigeratedtransportation.Foralltheseproducts,Temperature(T)isthemostimportantfactorforextendingshelflife,beingessentialtoensurethattemperaturesalongthecoldchainareadequate.However,localtemperaturedeviationscanbepresentinalmostanytransportsituation.Reportsfromtheliteratureindicategradientsof5°
Cormore,whendeviationsofonlyafewdegreescanleadtospoiledgoodsandthousandsofEurosindamages.Arecentstudyshowsthatrefrigeratedshipmentsriseabovetheoptimumtemperaturein30%oftripsfromthesuppliertothedistributioncentre,andin15%oftripsfromthedistributioncentretothestores.Royetal.analyzedthesupplyoffreshtomatoinJapanandquantifiedproductlossesof5%duringtransportationanddistribution.Thermalvariationsduringtransoceanicshipmentshavealsobeenstudied.Theresultsshowedthattherewasasignificanttemperaturevariabilitybothspatiallyacrossthewidthofthecontaineraswellastemporallyalongthetrip,andthatitwasoutofthespecificationmorethan30%ofthetime.Inthoseexperimentsmonitoringwasachievedbymeansoftheinstallationofhundredsofwiredsensorsinasinglecontainer,whichmakesthissystemarchitecturecommerciallyunfeasible.
Transportisoftendonebyrefrigeratedroadvehiclesandcontainersequippedwithembeddedcoolingsystems.Insuchenvironments,temperaturesriseveryquicklyifareeferunitfails.Commercialsystemsarepresentlyavailableformonitoringcontainersandtrucks,buttheydonotgivecompleteinformationaboutthecargo,becausetheytypicallymeasureonlytemperatureandatjustonepoint.
Apartfromtemperature,waterlossisoneofthemaincausesofdeteriorationthatreducesthemarketabilityofperishablefoodproducts.Transpirationisthelossofmoisturefromlivingtissues.Mostweightlossofstoredfruitiscausedbythisprocess.Relativehumidity(RH),Toftheproduct,Tofthesurroundingatmosphere,andairvelocityallaffecttheamountofwaterlostinfoodcommodities.Freewaterorcondensationisalsoaproblemasitencouragesmicrobialinfectionandgrowth,anditcanalsoreducethestrengthofpackagingmaterials.
Partiesinvolvedneedbetterqualityassurancemethodstosatisfycustomerdemandsandtocreateacompetitivepointofdifference.Successfultransportinfoodlogisticscallsforautomatedandefficientmonitoringandcontrolofshipments.Thechallengeistoensureacontinuous„coldchain‟fromproducertoconsumerinordertoguarantyprimeconditionofgoods.
TheuseofwirelesssensorsinrefrigeratedvehicleswasproposedbyQingshanetal.asanewwayofmonitoring.SpecializedWSN(WirelessSensorNetwork)monitoringdevicespromisetorevolutionizetheshippingandhandlingofawiderangeofperishableproductsgivingsuppliersanddistributorscontinuousandaccuratereadingsthroughoutthedistributionprocess.Inthisframework,ZigBeewasdevelopedasaverypromisingWSNprotocolduetoitslowenergyconsumptionandadvancednetworkcapabilities.Itspotentialformonitoringthecoldchainhasbeenaddressedbyseveralauthorsbutwithoutrealexperimentation,onlytheoreticalapproaches.Forthisreason,inourworkrealexperimentationwiththeaimofexploringthelimitsofthistechnologywasapriority.
Themainobjectiveofthisproj
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- 外文翻译 zigbee检测探头在冷藏蔬菜运输现实条件下的测试大学论文 外文 翻译 zigbee 检测 探头 冷藏 蔬菜 运输 现实 条件下 测试 大学 论文