실험 및 실선 계측을 통한 진동특이치 평가에 관한 연구
A Study on the Modal Parameter Identification of a Ship using Operational Modal Analysis
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When modal tests on the large structures and machinery are performed, it is in general difficult and inaccurate to use artificial excitation devices such as impact hammers, because of insufficient capacity of the device and different environmental conditions of the concerned structures. Therefore, the Operational Modal Analysis(OMA) technique, which is performed by measuring only vibration responses during the operation of the objective product, can be one alternative. In this paper, the way to identify natural frequencies, mode shapes and damping ratios of a ship by using the OMA during the sea trail is described.
Abstract
When modal tests on the large structures and machinery are performed, it is in general difficult and inaccurate to use artificial excitation devices such as impact hammers, because of insufficient capacity of the device and different environmental conditions of the concerned structures. Therefore, the Operational Modal Analysis(OMA) technique, which is performed by measuring only vibration responses during the operation of the objective product, can be one alternative. In this paper, the way to identify natural frequencies, mode shapes and damping ratios of a ship by using the OMA during the sea trail is described.
참고문헌 (5)
- Control of Ship Vibration and Noise, "Korean register of shipping", ~ (1997)
- Mehdi Batel, "Operational modal analysis another way of doing modal testing", SOUND AND VIBRATION, pp.22~27 (2002)
- Nuno M.M Maia, "Fundamentals of singular value decomposition", Preceeding of the 9th International Modal Analysis Conference, pp.1515~1521 (1991)
- Practical Use of the Hilbert Transform Bruel & Kjær Application Note, "N.Thrane", ~ (1997)
- Modal Analysis Theory and Testing, "Ward Heylen", Katholieke Univertiteit Leuven, ~ (1997)