1、南京航空航天大學(xué)碩士學(xué)位論文風(fēng)扇葉片飛鳥(niǎo)撞擊瞬態(tài)響應(yīng)分析及損傷評(píng)定姓名：趙海歐申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：航空宇航推進(jìn)理論與工程指導(dǎo)教師：高德平陳偉20000201南京航空航天大學(xué)碩士學(xué)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(huà)nefansufieredbirdimpactiSassessed5Somekindsofanimationsaremadeaboutthefandisplacementandthes仃esschangeinthefanInthispaperthetransientresponseprocessofbir

9、dimpacttoenginefanissuccessfullysimulatedwithcontactimpactfiniteelementmethodThemechanismoffancrackandtransientperformanceaboutthefanSHfieredbirdimpactarebroughttolightThemethodofdamageassessmentispresentedA11oftheseprov