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1、第21卷第1期农业工程学报Vol.21No.12005年1月TransactionsoftheCSAEJan.200517Finiteelementmodelsofwatermelonandtheirapplications1,2111JamalNourain,YingYibin,WangJianping,RaoXiuqin(1.CollegeofBiosystemsEngineeringandFoodScience,ZhejiangUniversity,Hangzhou310029,China;2.AgriculturalEngineeringDepart
2、ment,SinnarUniversity,Sudan)Abstract:Thefirmnessofwatermeloncanbenondestructivelyevaluatedbymeasuringtheresonantfrequencyofthewatermelon.Thewatermelonwasexcitedbyawoodenpendulumballandtheresponsesignalwascapturedbyanaccelerometer.TheFEmodelsofwatermelonswereestablishedandtheoptimum
3、locationoftheforceexcitationandthesuitableresponsemeasurementsensorformeasuringtheresonantfrequencyofwatermelonweredetermined.Themiddlepartonthefruitsurfacewassuggestedtobeusedwhileestimatingthefruitfirmnessbytheresonantfrequencyofthefirst-typelongitudinalmode.Tomeasuretheflexuralm
4、ode,thedirectionsofboththeexcitingforceandsensoryaxisoftheresponsemeasurementssensorshouldbekeptintangenttothefruitsurface.Thecomparisonbetweenexperimentalresultsandthefiniteelementestimatedresultsconfirmsthatthemodelisinreasonableagreementwithrealfruit.ItwasfoundthattheYoung'smodu
5、luswasanadequateindicatorforfirmness,andthehighcorrelationbetweentheresonantfrequency2andYoung'smodulusexisted,R=0.90.Theresultsofthisstudymaybehelpfultodevelopthenon-destructivefirmnesssensorforsphericalfruits.Keywords:watermelon;finiteelementmodels;firmness;physicalproperties;ins
6、pectionCLCnumber:TP274;O242.1Documentcode:AArticleID:1002-6819(2004)06-0017-06frequencyandmthemassofanapple,couldbeusedto0Introductionrepresentthefirmnessoftheapple.ChenandDe[6-8]NondestructivemeasurementoffruitfirmnesshasBaerdemackerappliedthefiniteelementmethodtobecomeaworldwidei
7、nterestinrecenttimes.Basedonanalyzethevibrationalmodesinapplesandotherthephysicalpropertiesofthefruit,manyfruits.Theyreportedthatthreeclassesofvibrationalnondestructivetechniqueshavebeendevelopedformodes,torsional,thefirsttypespheroidal,andthefruitqualityevaluation.Forexample,there
8、sonantsecondtypespheroidal
