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J. Ocean Eng. Technol. 2008;22(1):70-74.    

Experimental Vibration Analysis of Damped Beam Model Using Multi-degree Curve Fitting Method
Min Cheon-Hong,Bae Soo-Ryong,Park Han-Il
Graduate School of Korea Maritime University,Agency for Defence Development,Division of Ocean Development Engineering Korea Maritime University
다자유도 곡선맞춤법을 이용한 감쇠보 모델의 실험 진동해석
민천홍,배수룡,박한일
한국해양대학교 대학원,국방과학연구소,한국해양대학교 해양개발공학부
© 2008 The Korean Society of Ocean Engineers     Open access / Under a Creative Commons License
Keywords: Curve fitting method, Experimental modal analysis, Damped beam model, Modal parameter, Modal identification
핵심용어: 곡선맞춤법, 실험모드해석, 감쇠 보 모델, 모드변수, 모드추출
Abstract
It is important to reduce the vibration and noise of submarines and ships. For the purpose of noise reduction, various researches are actively being conducted on the employment of complex structures. However, in the case of numerical analysis for complex structures with damping materials, substantial errors can be generated by the absence of an exact damping model. Thus experimental model analysis is necessary for the verification of a numerical analysis for complex structures. In this research, vibration experiments are conducted in order to ascertain the vibration properties of cantilever beam attached damping materials. First, an initial value is obtained by using a direct linear method. Next, based on this initial value, the exact modal parameters of the cantilever beam are obtained by using the Newton-Raphson method.


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