隨機激勵下結(jié)構(gòu)疲勞損傷累積及應(yīng)用.pdf

1、浙江大學(xué)碩士學(xué)位論文隨機激勵下結(jié)構(gòu)疲勞損傷累積及應(yīng)用姓名：何世民申請學(xué)位級別：碩士專業(yè)：固體力學(xué)指導(dǎo)教師：黃志龍朱位秋20000201AbstractThefatiguereliabilityandfatiguelifeofStructureunderstochasticexcitationsarestudiedbasedonstochasticaveragingmethodTheprocessoffatiguedamageiscons

2、ideredtobenotonlyadiffusiveMarkovprocessbutalsoaMowchangingprocessincomparisonwithstressprocessanditstransferprobabilitydensitysatisfiescertainFPKequationThetransferprobabilitydensitycanbegainedbysolvingtheFPKequationThe

3、statisticvalueoffatiguedamageandfatiguelife，suchasconditionalmeanvalueandvarianceoffatiguedamage，reliabilityfunctionoffatigue，conditionalprobabilitydensityoffatiguelife，meanvalueandvarianceoffatiguelifeandsoon，canalsobeo

4、btained，Thedit弧cultonsolvingtheFPKequationliesinhowtogettheonedimensionalorjointprobabilitydensityofprocessofstresspeakWhenthestressprocessisastationarynalTnwbandstochasticprocess，theonedimensionalprobabilitydensityandth

5、eapproximatedjointprobabilitydensityexistandtheassociatedFPKequationcanbesolveddirectlyAsanexample，westudiedthefatiguedamageofanoffshoreplatformundercertainwaveloadandgotreasonableresultsWhenthestressprocessisastationary

6、widebandstochasticprocess，therearenottheonedimensionalorjointprobabilitydensityofprocessofstresspeakTherainflowcountingmethodcanbeusedtogainthestatisticvalueofstressprocessandtheassociatedFPKequationcanalsobesolvedKEYWOR