Extension of dual equivalent linearization technique to flutter analysis of two dimensional nonlinear airfoils

Tóm tắt

This papcr cxtcnds the dual equivâlent linearizatìon technique (ELT) to obtam Cutter spKĩeđs of a two-dimcnsional aừ/oil vvith nonlincar stíỄness and đamping in pilch degree of íreedom. Although thc US€ of dual ELT has bcen ứivcstigatcd m some previous papers, this papcr prescnts an cxtcnsìon of dual ELT using thc global-Iocal approach, ừi tvhich the local equivalcnt ỉinearization cocfficíerts arc avcragcd in the global sense, The numerical calculatíon shows that the extcnded dual ELT gives more accưrate ílutter speeds ừi comparison with thc ones of classical ELT