Proceedings of the Korean Society for Noise and Vibration Engineering Conference (한국소음진동공학회:학술대회논문집)
- 1998.04a
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- Pages.340-346
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- 1998
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- 1598-2548(pISSN)
Dynamic model updating of the laminated composite plate using natural frequencies measured from modal test
고유진동수의 실험값을 사용한 복합재 적층판의 동적 모델링 개선
Abstract
In order to improve the prediction of dynamic behavior in structures, several lower vibration modes from FFT analysis through experiments are used to update the mechanical properties followed by the updated frequencies from numerical analysis. Performance index consists of the sum of error norms between the chosen frequencies and corresponding frequencies from numerical analysis. As an updating process of the natural frequencies, the optimization algorithm based on conjugate gradient method is adopted. The gradient of performance index is calculated using the sensitivity of selected eigenvalues with respect to each design parameter. The mechanical properties of lamina, E
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