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ID:36353702
大小:4.48 MB
页数:123页
时间:2019-05-09
《基于神经网络方法的鸟撞飞机风挡反问题研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、西北工业大学博士学位论文基于神经网络方法的鸟撞飞机风挡反问题研究姓名:白金泽申请学位级别:博士专业:飞行器设计指导教师:孙秦20030301西北工业大学博士论文机数据分析系统”(CADABIE),目前该软件已经在320厂鸟撞实验室以及IRAN—Esfahan空军鸟撞实验室中得到重点应用并获得好评。根据已有的研究成果,本文提出了鸟撞实验的改进方案,可以在满足实验测量要求的基础上简化实验过程,提高实验效率。关键词:鸟撞飞机风挡冲击载荷识别有限元人工神经网络反问题要!!三些查兰竖主丝苎ABSTRACTWiththed
2、evelopmentoftheaircraftperformanceatlowaltitudeandhighspeed.aswellasthemarkedprogressofeco.environmentalprotection.theissueofbirdimpacttoaircrafthasbeenconcernedmoreandmore.Intheresearchofbird.impacttoaircrafiwindshield.theexperimentisalwaystheultimateandthe
3、mosteffectivemethod.Buttheexistingdataofbirdimpactarehighlydisperse,SOthattheydolesshelpforthedesignofwindshieldandalsocostmoretoexperimentalWOrk.Inthisthesis,acombinedmethodoffiniteelementnumericalsimulationwithneuralnetworkisstudiedtoobtainthedynamicrespon
4、se,tlleimpetusforcesandimpactparametersofwindshieldduringbirdimpact.ThethesispresentsAwavelet.dynamic—-delay··feedback(WDDF)typeofneuralnetworkandmakesin-deepstudiesoftheWDDFtheoreticalframework,learningtheoryandmethod,improvedtrainingeffectiveness,powertoex
5、tend,andtechnicalimplementation.Thepresentedneuralnetworktakesstrain—timedataasinputattffolocationsonthebackofstruckbody,andgiveshighlypreciseoutputsoftheimpactforce—timedata,impactkineticenergyandthecoordinatesofimpactposition.Alsothenetworkshowsmanyadvanta
6、gesofhightrainingefficiency,robustnessandanti-jammingenergy,aswellastheextensiveapplicabilitytotheacademicstudyandpracticalrequirementofbirdimpactissue.Inthepositive—issueresearchofbirdimpact.thethesiscarefullyexploresthebasictheories,finiteelementnumericalm
7、ethodandkeytechniquesofthesolutionprocessinLS—DYNA3Dsoftwaresystemforcontact.impactissueofviscoelasticbodiesatlargedeformation.Thewell—chosencasesexaminetheaccuracyofsotutionsinLS—DYNA3Dforlargedeformationimpactissues.Uridertheproofwork.theincrementalconstit
8、utiveequationofbilinearandnonlinearviscoelasticmaterialsarederived.codedandverifiedinLS.DYNA3D.Onthebasisoftheabovementionedtheoreticalandcase—computationalwork,theelementtypes,structuraldimensi
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