资源描述：
《毕业设计外文翻译--真空压力播种机的数学建模》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、目录1.Introduction……………………………………………………3引言……………………………………………………………172.Materialsandmethods…………………………………………4材料和方法……………………………………………………183.Resultsanddiscussion…………………………………………7结果与讨论……………………………………………………214.Conclusions……………………………………………………13结论…………………………………………………………265.Acknowledgements…………………………………………13鸣谢……
2、…………………………………………………26-25-MathematicalModellingofVacuumPressureonaPrecisionSeederD.Karayel1,Z.B.Barut2andA.Özmerzi11AkdenizUniversity,FacultyofAgriculture,DepartmentofAgriculturalMachinery,07070,Antalya,Turkey2ÇukurovaUniversity,FacultyofAgriculture,DepartmentofAgriculturalMachinery,Adana,Turkey;
3、e-mailofcorrespondingauthor:dkarayel@akdeniz.edu.trReceived9July2003; accepted19January2004. Availableonline13April2004.AbstractThepurposeofthisresearchwastodeterminetheoptimumvacuumpressureofaprecisionvacuumseederandtodevelopmathematicalmodelsbyusingsomephysicalpropertiesofseedssuchasonethousan
4、dkernelmass,projectedarea,sphericityandkerneldensity.Maize,cotton,soyabean,watermelon,melon,cucumber,sugarbeetandonionseedswereusedinlaboratorytests.Onethousandkernelmass,projectedarea,sphericityandkerneldensityofseedsvariedfrom4.3to372.5 g,5–77 mm2,38.4–85.8%and440–1310 kg m−3,respectively.Theo
5、ptimumvacuumpressurewasdeterminedas4.0 kPaformaizeIandII;3.0 kPaforcotton,soyabeanandwatermelonI;2.5 kPaforwatermelonII,melonandcucumber;2.0 kPaforsugarbeet;and1.5 kPaforonionseeds.Thevacuumpressurewaspredictedbymathematicalmodels.Accordingtotheresults,thefinalmodelcouldsatisfactorilydescribethe
6、vacuumpressureoftheprecisionvacuumseederwithachi-squareof2.51×10−3,rootmeansquareerrorof2.74×10−2andmodellingefficiencyof0.99.NomenclatureNomenclaturea,b,c,d,eregressioncoefficientsEmmodellingefficiencyErmsrootmeansquareerrorkexpexperimentalvacuumpressure,kPakexp,meanmeanvalueofexperimentalvacuu
7、mpressure,kPa-25-kprepredictedvacuumpressure,kPaLlength,mmm1000onethousandkernelmass,gNnumberofobservationnnumberofconstantsinthemodelPprojectedarea,mm2Pvvacuumpressure,kPapprobabilityR2coefficientofdeterminationTthickness,m
