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Large aspect ratio sandwich wing flutter analysis of high angle of attack

ngUniversityofAeronauticsandAstronauticsNanjing, 210016) AbstractThesemi ·-analyticalexpressionsareestablishedfirstforthecoupledmodesofbendingandtorsionofahigh - aspect-. ratiocompositebeam. andthenthedynamicequationsofahigh-aspect-ratiosandwichwingwithNACA0012airfoilshapearederivedinmodalspace. Asemi-empiricalandnonlinearaerodynamicmodelONERAisemployedtOmodelaerodynamicsthatthenonlinearaeroelasticproblemofasandwichwingiswelldefined. Thenonlinearflutterboundaryofthesandwichwingisobtainedbyjointlyrunningstructuralsolverandaerodynamicsolver. InordertOvalidatethepresentedmethod, thelinearflutterequationsofthesandwichwingareestablishedusingthelinearpartoftheONERAmode1. Thenumericalresultsshowthatthelinearflutterspeedagreeswellwiththosepredictedbythemethodofthenonlinearanalysis. Theflutterspeedde-creasesrapidlywithanincreaseoftherootangleofattack, andtheflutterspeedofthesandwichwingissignificantlyinflu-encedbylaminateplyangles. Keywords: flutter; 0NERAmodel; sandwichwing; coupledmodes first author Yong-Hui Zhao M, post-doctoral , 1969 l1 native of . Phone :025 -4891672 . Email: hyhu @ nuaa. edu. crl Appendix A for a [AlA2] Al = A2 a - ~ sinp · -? cosy1OO · - BeosB - gpcosflfl ~ sinflI - gpsinfl - g ~ cos7L a Lu Lu 77sin7 0s play a [ a 100 - ~ cosha A / I 2,[link widoczny dla zalogowanych], r a /, 7 = b / rOy. -? Sin7 a g7sin? ' a 7, c0s - g, cosha] g. A (c | 'cb) / (ia),[link widoczny dla zalogowanych], g = (0%-b) / (i0) g7 a ('c a ) / ( ) a [ no. ] r0l mouth beans l-I five. linha [g, sinhaB2 = 1OO-c0s - g ~ os? ' a -sin-g7siIlO Lu 1} a ~ sinfl-gin8 a 2 ~ / ql3cos [Or - @) la ']-t-al31 -2 @ cos [(,[link widoczny dla zalogowanych], r.-t. - ~ b) / 3 -t. -a / 3 a cos a [(27ab ~ - 9ab - 2a.) / (2)] q = b + a/3a = a / c, b = $ / c, a / CJ,[link widoczny dla zalogowanych],-b = t ~ l '/ EIc a one of a Kf (El · GJ mouth 0boo0b eleven . = luxuriant one. . , one. canthal climbing season ..-li eleven ... a ~

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