發(fā)動機管路輸送系統(tǒng)的振動可靠性分析.pdf

1、分類號：UDC：工學碩士學位論文密級編號發(fā)動機管路輸送系統(tǒng)的振動可靠性分析碩士研究生指導教師學位級別學科、專業(yè)所在單位論文提交日期論文答辯日期學位授予單位張永國安偉光教授工學碩士結(jié)構(gòu)工程航天與建筑工程學院2008年5月2008年6月哈爾濱工程大學哈爾濱下程大學碩士學位論文ABSTRACTThispapercomesfromthefaultcausedbypipeleakagethatisduetothevibrationproduced

2、byanoperativeengineactingonthepipelinecombinedwithitItmainlydiscussesthreeissues：dynamicresponseofstructuresunderstochasticprocessexcitation，thecalculationofdynamicreliabilityandstructuraldynamicoptimumdesignRandomvibrat

3、iontheoryisthebasisofstructuraldynamicreliabilitytheoryItisextremelydifficulttoestablishandsolverandomvibrationdifferentialequationsofstructuresduetotheuncertaintyofloadsBasedonthebasictheoryofrandomvibration，aruleistake

4、nintoconsiderationinthisarticlethatthemeansquaresolutionofalinearstochasticordinarydifferentialequationhasthesameformasthedefinitesolutionofitscorrespondingcertaindifferentialequationPseudoloadsCallbeconstructedfromknown

5、accelerationspectrumdensitybasedonthepseudoexcitationmethodTheproblemofstMionaryrandomvibrationcanbetransformedintothesolutionofsteadystateharmonicresponse，andthenthecalculationformulasforstructuralrandomresponsecanbeobt

6、ainedinfrequencydomainAfterthat，RiceformulaisusedtodeducethelevelcrossingrateofnormalrandomresponseOntheassumptionthatthelevelcrossingnumberofdynamicresponseobeysthePoissondistribution，theformulaforstructuraldynamicrelia

7、bilityunderPoissonhypothesisisgivenOntheassumptionthatthefatiguelifeofstructuralmaterialobeyslognormaldistribution，computingformulasforstructuralaccumulativedamageandfatiguelifetimecanbeobtainedonthebasisofBasquinequatio

8、nSotheoreticalcalculationofstructuraldynamicreliabilitybasedontwokindsofcriteria，namelythefirstpassagefailurecriteriaandthefatiguefailurecriteria，CanbecarriedoutThen，reliabilityrequirementscanbeintroducedintoconstrainedc