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ID:39120859
大小:2.16 MB
页数:54页
时间:2019-06-25
《飞机水上迫降的运动特性分析和讨论》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、AbstractSineelast20s,designersofmarineaircrafthavefocusedonditchingcha“峨er砖tics.Athst60s,ditchinghasbeenintroducedintoairworthinessregulationbycivilaviationadministrationofeachcountry.Thus,problemsofa备cmRs’performancesafetydtringditchingneedtobesolved,inordertosucceedmtiona
2、lairHworthinessvalidation.Whilestudyingperformancesafetyofaircraftsduringditching,therearethreeeValuationstoconfirmthatditchingissuccessful:1.whetherdeformationanddynamicattitudeofstrmtlxeaffectseriouslypassengers’escape;2.whethercrewandpassengerscanaffordoverloadofwaterimp
3、act;3.whetherthereisenoughtimeforCreWandpassengerstoescapefromcabin.Inordertoexamineandapprovethethreeevaluationsabove,itisnecessarytogetdeepunderstandingaboutditchingcharacteristics(suchas,waterimpactbad,crashworthinessandfloatationperformance).Amongthem,waterimpactbadandc
4、rashworthinessaremaincontentspresertedinthepaper.Actually,interactionbetweenwaterandaircraftisaclassicalinterdiscplinaryproblemoffluidmechanicsandsolidmechanics,andfluid·solidinteractionreferstonon-linearbehavioroffluid.It’thepremiertodescribefluidboundaryandsimulatethecoup
5、lingforcebetweenfluidandsolidforsolvingwaterimpactproblem.Themainaimofthispaperistobuildditchingmodelforcomputation.WithintroducingALEmethodtodescribefluidboundaryandpenaItycouplingmethodtodefinefluid.solidinteraction,ditchingissimulatedbymeansofexplicitdymrnics.Bysimulatin
6、gtheditchingtestofsubscalemodelandcomparingexperimentalresuItswithnumericalresult,validationofthemethodisverified.Meanwhile,regularitiesofkeyphysicalparameters(e.吕angleofattack,overloadacceleration)havebeenanaly孺d.TheresearchresultshavebeenpresentedaSf0110WS:1.Basedonthedet
7、ailedinvestigationsofrelatedlitemttaes,geometricalm甜elofaircraflA320andrelateddataaleobtained.WntheUseofCADandCAEcodes,geometryofaircraftandnumericalmodelforditchinghasn武汉理工大学硕士学位论文beenmodeledsuccessfully.2.ByusingALEalgorithmandpenaltycouplingmethod,theinteractionbetweenai
8、rcraftandwaterissmcessfullysimulated.Comparedwithtest-experimentalresults,itcanbeo
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