串并聯(lián)生產系統(tǒng)的模型研究.pdf

1、天津大學博士學位論文串并聯(lián)生產系統(tǒng)的模型研究姓名：劉佳璐申請學位級別：博士專業(yè)：控制科學與工程；控制理論與控制工程指導教師：吳愛國201105ABSTRACTThemodelingandperformanceevaluationofproductionsystemhavesignificantvaluesinindustrybecauseoftheincreasedmarketsizeandincreasedcompetitionamo

2、ngenterprisesThisdissertationconcentratesontheresearchofseriesparallelproductionlinesinthefollowingaspectsInthisdissertation，weaddresstheproblemsformodelingofproductionsystemandpointoutthecharacteristicsofthesystemperfor

3、manceFirstwemodelandanalyzeatwoaagemanufacturingsystemwithmultipleindependentunreliablemachinesateachstageandonefinite—sizedbufferbetweenthestagesThismodelisexactandisconstructedbymeansofaMarkovprocessesThenwedefinethest

4、atespaceoftheMarkovprocessesandgeneratethetransferratematrixofthisMarkovprocessesWefurtherpointoutthatthetransferratematrixcanbetransformedintoamatrixformfittingthepropertiesofaQuasi—BirthDeath(QBD)process，andusetheMatri

5、xAnalytic(MA)methodtocalculatethesystemstateprobabilityandthroughputNumericalresultsdemonstratethatthenewmultistatemodelandtheMAsolutionmethodareaccurateandfastinanalyzingmanufacturingsystemswithparallelmachinesAnapproxi

6、matedecompositionmethodispresentedfortheanalysisofthegeneralseriesparallelproductionlinesFirstatwostageanalyticalmodelwithmultipleindependentunreliablemachinesateachstageisintroducedasthebasiccomponentinthesystemThenanap

7、proximatedecompositionmethodispresentedtoanalyzethesystemthroughputNumericalexperimentsaregiventoshowtheaccuracyandreliabilityofthedecompositionmethodComparingwiththeWitnesssimulationmodel，theproposedanalyticalmodelinthi

8、sdissertationisaccurateandreliableOnthisbasis，weusethismodeltoanalyzeanddiscusstheeffectsofsystemparametersonsystemperformance，suchasmachinequantit5processingrate，failurerateandrepairrateetcAndtheresultsindicatethat：(1)t

9、hethroughputofproductionsystemwillincreasewhilethebuffercapacitiesincrease；(2)theWIPwillincreasewhilethebuffercapacitiesincrease；(3)thesystemperformanceimproveswiththeimprovementofmachines’performance；(4)themachinesatthe