2023年全國碩士研究生考試考研英語一試題真題(含答案詳解+作文范文)_第1頁
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1、同濟大學碩士學位論文高壓天然氣管網(wǎng)干線輸氣系統(tǒng)的優(yōu)化姓名:阮應君申請學位級別:碩士專業(yè):供熱、供燃氣空調指導教師:周偉國任建興2002.12.10月濟^攀q【士攀t話支AbstractWiththestartupofWest—EastNaturalGasTransmissionProject,theconstructionofalongdistancegaspipelinewillcomeintoanewerainChinaAnewdi

2、rectionofgaspipelinedevelopmentwiilbelarge~diameter,high—pressureandlong—distanceGas—networksgetlargerandlargerandmoreandmorecomplicatedGas—networksdesigntakesintoaccountnotonlyGas—networksadvancedtechnology,butalseasona

3、blecostTheconstructionofmain—linesystemingasnetworksisusuallylargescaleandenormouscapitalinvestmentThecostofapipelinemayadduptoseveralbillion,evenseveraltenbillionTheinvestmentsofa11kindsofplots,whicharereasonableintechn

4、ology,havethelargedifferenceTherefore,basedonthecharacteristicsofgasnetworkstheuseofoptimizationmethodsbecomequiteindispensabletogasnetworksdesign。Tationallydesignthegaspipelineisagreatheapteducethecost,improvemanagement

5、andincreaseeconomicbenefitConsideringallkindsoffactors(diameter,thickness,pressure,length,compressorstationsetc)thatinfluencethetotalcostofgaspipeIine,thispaperestablishedacomprehensiveandreasonableoptimaldesignmathemati

6、cmodelofgaspipelineTheaimofthemodelisTotalPresentValuebyconvertingonallkindsofpipelinecostsInviewofthecharacteristicsofmodelthatincludescontinuousvariables(pressure,length,temperatureetc)anddiscretevariables(diameter。thi

7、ckness。compressorstationsetc),onthebasisoftraditionalmethods,anewmethodMixedDiscreteOftimizationisraisedItisprovedthatthemethodproposedinthispaperisaneffectivemethodtosolvenonlinearconstrainedoptimizationofcontinuousandd

8、iscretevariablesbywayofapplicationBasedontheabovetheories。anapplicableHighpressurePipelineProgramiscompiledTwokindsofcomputerlanguages(FortranandVisualBasic)areadoptedintheprogramFurthermore,theportbetweenVisualBasicandF

9、ortranbyDLL(DynamicLinkLibrary)isaccomplishedwhichmaketheprogramnotonlyhavegoodWindowsuserinterfacebutmakeuseofFortrancharacteristicsofframaworkclarityandstrongfunctionsofnumericalcomputationandmathematicsanalysisInaddit

10、ion,consideringtheeffectofhighpressureandtemperatureinhighpressurepipelinetothegascompressibilityfactor。avisualandsimpleofGasCompressibilityFactorProgramisdevelopedTheprogramisanassistantprogramofHigh—pressurePipelinePro

11、gram,alsobeindividualanapplicableprogramforgascompressibilityfactorcalculatingFinallyHi靜pressurePipelineProgramisappliedtoapracticalprojectandtheeffectsofdesignparametersonthetotalcostofgaspipelineareanalyzedKeywords:Hig

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