垂直軸風力發(fā)電機組主軸的動力疲勞研究.pdf

1、上海大學碩士學位論文垂直軸風力發(fā)電機組主軸的動力疲勞研究姓名：卞祥申請學位級別：碩士專業(yè)：結構工程指導教師：李春祥20080301ABS。I。RAC’I。ThemainobjectiveofthepresentpaperistoinvestigatetheStaticandDynamicFatigueofMainShaftintheVertical—AxisWindTurbines(VAWT)underthenonrotationand

2、rotationThefirstpartofthepresentpaperistocarryoutthethree—dimensionalstaticanalysisofthemainshaftintheVAWTunderthenon—rotationwithresortingtoANSYStoobtainthestressdensityandthedisplacementwiththeheightEmployingtheresults

3、ofthisanalsis，theSNcurveandfatiguelifeusagecoefficientthenareobtainedbasedonthefatigueaccumulateddamagetheoryThesecondpartofthepresentpaperistoinvestigatethedynamicbehaviorsofthemainshaftintheVAWTundertherotation，thethre

4、e—dimensionalmodeloftheVAWTisconstructedusingtherotordynamicsandANSYScodeinthecaseofincludingtherotationandwindloadsintoconsiderationSomeusefulsuggestionsareproposedthroughnumericallystudyingthenaturalfrequencies，modesha

5、pes，criticalrotaryspeed，alongwiththemaximumdynamicdisplacementsinthreecriticalpositionsofthecurrentvertical—axisundertherotation，thusgivingtheguidelinesfordesigningbetterVAWTThethirdpartofthepresentpaperistostudythewindi

6、nduceddynamicfatigueofthemainshaftintheVAWTundertherotationwithresortingtotheANSYScodeFirstlythedynamicresponsesinthreecriticalpositionsofmain—shaftinthecurrentverticalaxisareanglicizedinthecaseofincludingtherotationandw

7、indloadsintoconsideration，respectivelyinthefrequencydomainandtime—domainBasedontheinvestigationsonthedynamicresponses，thewind—induceddynamicfatigueofmainshaftinthecurrentVAWTundertherotationisthenstudied，SOastodeterminet