風扇葉片飛鳥撞擊瞬態(tài)響應分析及損傷評定.pdf

1、南京航空航天大學碩士學位論文風扇葉片飛鳥撞擊瞬態(tài)響應分析及損傷評定姓名：趙海歐申請學位級別：碩士專業(yè)：航空宇航推進理論與工程指導教師：高德平陳偉20000201南京航空航天大學碩士學位論文AbstractInthisPaper’thetransientresponseofaeroenginefanunderthebirdimpactloadsiSanalyzedwiththecontactimpactfiniteelementmetho

2、dandthedamageoffanisassessedThemechanismofcontactimpactprocessiSdiscussedAccordingtothevalidcomputationalresultsandthemeansofdamageassessmentthedesignmethodofimprovinganti‘impactingenginetanISpresented。Themaincontentsofr

3、esearchworkare：1BasedonthetheoryofCOntinuousmediummechanics，thebasisequationsareobtainedaboutthecontactimpactproblemandallkindsofboundaryconditionsincludingthecontactimpactboundaryconditionarepresentedThecentraldifierenc

4、emethodofexplicitsolutioniSalsopresentedandthecontactimpactalgorithmiSmainlydiscussed2ThecomputationalmodelofthebirdimpactonthefaniSbuiltSomeimportantfactorsareanalyzed，suchasdifierentmaterialmodel，withornotthecentrifuga

5、lpull，di療erentallgletoimpactfandifierentimpactplaceOIlthefanandSOon3Thetransientresponseofaminorbird(O085kg)impactonsinglefan，amiddlebird(O68k曲impacttoseveralaeroen垂nefansandalargebird(1814kg)impactonwholestagefanaresimu

6、latedwiththecontact—impactfiniteelementmethodTheconclusionsarethatthelpealplasticdeforrnationiSonlyconsideredaboutminorbirdimpactandthelpealplasticdefoI“111ationattheimpactedzoneandthefanrootzone，thedisplacementoffantipm

7、ustbeconsideredaboutmiddleandlargebirdimpact4BasedonthepreviousclassifyofdamageanewkindofclassifyofdamageaboutbirdimpactfaniSputforwardAccordingtothematerialperformanceandtheresultsoftransientresponseanalysis，twodamagepa

8、rameterswhichhadnodimensionarepresented，bywhichthedamageof也eaeroen畫nefansufieredbirdimpactiSassessed5Somekindsofanimationsaremadeaboutthefandisplacementandthes仃esschangeinthefanInthispaperthetransientresponseprocessofbir

9、dimpacttoenginefanissuccessfullysimulatedwithcontactimpactfiniteelementmethodThemechanismoffancrackandtransientperformanceaboutthefanSHfieredbirdimpactarebroughttolightThemethodofdamageassessmentispresentedA11oftheseprov