资源描述：
《数学 外文翻译 外文文献 英文文献 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，更多相关内容在行业资料-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………
2、…………………………………13鸣谢………………………………………………………26-25-MathematicalModellingofVacuumPressureonaPrecisionSeederD.Karayel1,Z.B.Barut2andA.Özmerzi11AkdenizUniversity,FacultyofAgriculture,DepartmentofAgriculturalMachinery,07070,Antalya,Turkey2ÇukurovaUniversity,FacultyofAgriculture,Departmen
3、tofAgriculturalMachinery,Adana,Turkey;e-mailofcorrespondingauthor:dkarayel@akdeniz.edu.trReceived9July2003; accepted19January2004. Availableonline13April2004.AbstractThepurposeofthisresearchwastodeterminetheoptimumvacuumpressureofaprecisionvacuumseederandtodevelopmathematicalm
4、odelsbyusingsomephysicalpropertiesofseedssuchasonethousandkernelmass,projectedarea,sphericityandkerneldensity.Maize,cotton,soyabean,watermelon,melon,cucumber,sugarbeetandonionseedswereusedinlaboratorytests.Onethousandkernelmass,projectedarea,sphericityandkerneldensityofseedsva
5、riedfrom4.3to372.5 g,5–77 mm2,38.4–85.8%and440–1310 kg m−3,respectively.Theoptimumvacuumpressurewasdeterminedas4.0 kPaformaizeIandII;3.0 kPaforcotton,soyabeanandwatermelonI;2.5 kPaforwatermelonII,melonandcucumber;2.0 kPaforsugarbeet;and1.5 kPaforonionseeds.Thevacuumpressurewas
6、predictedbymathematicalmodels.Accordingtotheresults,thefinalmodelcouldsatisfactorilydescribethevacuumpressureoftheprecisionvacuumseederwithachi-squareof2.51×10−3,rootmeansquareerrorof2.74×10−2andmodellingefficiencyof0.99.NomenclatureNomenclaturea,b,c,d,eregressioncoefficientsE
7、mmodellingefficiencyErmsrootmeansquareerror-25-kexpexperimentalvacuumpressure,kPakexp,meanmeanvalueofexperimentalvacuumpressure,kPakprepredictedvacuumpressure,kPaLlength,mmm1000onethousandkernelmass,gNnumberofobservationnnumberofconstantsinthemodelPprojectedarea,mm2Pvvacuumpre
8、ssure,kPapprobabilityR2coefficientofdeterminationTthickness,m
