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In this paper, finite element modeling performed for vibration analysis of a rotor systeminstalled in sunroof motor, and analysis process was developed for natural frequency and unbalance response analysis. At the same time, to reduce analysis modeling error caused by the difference betwen analysis and measured values, finite element model updating was conducted using an optimization algorithm, i.e. hybrid genetic algorithm and annealing (HGASA) method. For this end experimental modal test was carried out and by using the measured frequency response function (FRF), model updating was performed considering both cases where core coil was removed and included. And acceptable result was obtained. Also, dynamic property coeficient of bush bearing which influences vibration response of the rotor system was estimated.접수일 : 2007년 1월 26일, 채택확정 : 2007년 2월 10일양보석(책임저자) : 부경대학교 기계공학부E-mail : bsyang@pknu.ac.kr Tel : (051) 620-1604김용한 : Queensland University of Tech. 공학시스템학과하종룡, 이재갑, 김선화 : 부경대학교 대학원