This paper . addres 忌 es 1he use ofwavelets for the identification ofnonlinear structural dynamic systems , The proposed method accurately determines hysteresis curves and damping coefflcients ofthe stmctural system without pre −assumptionsofnonlinear characteristics ofthesystem , whereby it enables ctarificati 〔 } n ofthe complex phenomena . Inthis method , incremental sti ffness of the structura ]system is expressed as a series expansion ofwavelets . CoeMcients oftheseries are estimaled by the least −squares mcthod , This method has been appliedto a varicIy ofproblems , whieh show the effectivencss ofthe method . Keywords : Jdenttfication , Mavelets, Multiresolution analysis , Nonlinear , " ysteresis curve , Dampin9 coeffi ' cient
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