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오창근(Chang-Geun Oh),제해광(Hae-Kwang Je),박석주(Sok-Chu Park) 한국항해항만학회 2002 한국항해항만학회지 Vol.26 No.3
진동해석과 기술에 있어서 실험과 해석분야 모두 다 같이 발전한 것은 사실이지만, 실험해석법은 유한요소법과 같은 이론해석법만큼 발달한 것이라 할 수 없을 것이다. 그 이유 중에 하나로 비선형 방정식을 푸는데 있어 초기치의 선택에 따라 계산시간이 길어지고 해가 종종 발산하기도 하기 때문이다. 일반적으로 실험모드해석에 있어 방정식은 고유진동수와 감쇠비의 비선형 항과 등가강성의 선형 항으로 구성된다. 본 연구에서는 비선형 항을 먼저 구하고, 다음에 선형 항을 구하였다. 개발된 실험모드해석법(곡선맞춤법)을 선체상부구조 모델에 적용하여, 모드 특성치들을 계산하였다. 또한 개발된 프로그램은 그래픽기법을 적용하여 간단한 마우스 조작으로 채용 모드수와 감쇠비를 결정할 수 있도록 하였다. It might be true that both experimental and analytic techniques have been developed in the vibration analysis and engineering. It could not be said, however, that the experimental method has been also developed as much as analytic method, such as Finite Element Method. One of the reasons is that computation time becomes longer and that the solution often diverges depending on the choice of initial value in solving nonlinear equation. The equation in experimental modal analysis is usually composed of the nonlinear term of natural frequency and modal damping ratio, and the linear one of equivalent stiffness. In this study, the nonlinear terms were solved first, and then the linear term was obtained. The experimental modal parameters were estimated, applying the developed experimental modal analysis (curve-fitting method) to the super-structure model. In addition, the number of modes and modal damping ratio could be easily determined by the developed program with the application of graphical techniques and with easy handling mouse button.
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박석주(Park Sok Chu),제해광(Je Hae Kwang),이금주(Yi Geum Joo) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
There are many attentions on the traditional cultural contents in Korea recently. The new recognition on the Korean music is the one of them. But there is few scientific analysis on the Korean musical instruments. This paper treats on the sound radiation of the Haegeum. The structural characteristic of making sounds of the haegeum is similar to that of the billion. But the sound height of the billion is nearly determined by the position of the finger, that of the haegeum is affected by the tension of the string also. This paper shows the sound radiation characteristics of the haegeum..
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박석주,오창근,제해광 韓國海洋大學校 附設 海洋科學技術硏究所 2001 硏究論文集 Vol.10 No.2
Up to now, vibration analysis and vibration engineering have been developed, encompassing the aspects of both experimental and analytical techniques. Using experimental modal analysis or modal testing, the mode shapes and frequencies of practical structure can be measured accurately. Curve-Fitting Method is realized through experimental modal identification. In the experimental modal parameter estimation, the estimation of modal damping factor is difficult for complicated and large structure. Also numbers of Selected mode are determined before the procedure. This paper describes the vibration shape of the super-structure model of ship through experimental modal analysis.
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