부진동의 제어를 위한 공진장치의 현장적용
Application of Wave Resonator to the Field for Controlling Secondary Undulation
4
조회
0
다운로드
2
인용
0
참고문헌
키워드
초록
본 연구에서는 장주기파에 의한 부진동 및 공진에 의한 선박의 이상동요를 저감시키기 위하여 공진장치를 실해역의 기설 항에 부착하여 그의 제어능을 수치적으로 검토하였다. 수치해석에 2차원타원형완경사방정식에 기초한 유한요소모델인 상용소프트웨어 SMS (Surface water Modeling System)의 CGWAVE MODULE을 적용하였고, 직사각형모델항만에 대한 기존의 실험 및 해석결과와의 비교·검토로부터 부진동해석에 대한 SMS의 타당성과 유효성 및 적용한 마찰계수값의 타당성을 검증하였다. 이로부터 직사각형항만에 공진장치의 부착유무에 따른 부진동의 비교검토로부터 그의 제어능을 확인하였다. 그리고, 포항신항에서 발생될 수 있는 부진동 및 계류선박의 장주기동요를 감쇠시키기 위하여 여러 크기의 공진장치를 적용하여 선박의 이상동요를 발생시키는 공진주기를 보다 장주기측으로 이동시키는 방안을 검토하였고, 이로부터 그의 유용성을 확인할 수 있었다.
Abstract
In this study, to reduce the motion of the vessels resulting from resonance and secondary undulation by long-period waves, numerical review on the control performance of resonator was carried out by attaching the resonator to the established harbor of real waters. In the numerical analysis, CGWAVE MODULE of commercial software SMS(Surface water Modeling System), a finite element model based on 2-dimensional elliptical mild slope equation was applied, and through comparative analysis of the existing experiments and analysis results on the rectangular model ports, the validity of the friction coefficients in which validity and effectiveness of SMS on the secondary undulation analysis is applied was verified. Based on this, the control performance of resonator was confirmed through comparative review of the secondary undulation according to whether or not to attach the resonator to rectangular harbor. In addition, to reduce long-period motion of the moored vessels and the secondary undulation which may occur in Pohang new port, the method to move the resonant period which causes abnormal motion of the vessels to long-term one was discussed through application of the resonators with various sizes, thereby identifying the availability.
참고문헌 (13)
- 정진우, "실해역에서 공진장치를 이용한 부진동의 제어", 한국해양공학회지, 24(6), pp.51~60 (2010), 한국해양공학회
- Chen, H.S., "Effects of bottom friction and boundary absorption on water wave scattering", Applied Ocean Research, 8, pp.99~104 (1986)
- Oscillations and wave forces on an offshore harbor, "Chen, H.S.", R.M. Parsons Lab., for Water Resources and Hydrodynamics, MIT, ~, pp.Report 190 (1974)
- Demirbilek, Z., "CGWAVE: A coastal surface water wave model of the mild slope equation" (1998), U.S. Army Corps of Engineer
- Wave induced oscillations in harbors: The solution for a rectangular harbor connected to the open-sea, "Ippen, A.T.", Massachusetts Institute of Technology, ~, pp.Hydrodynamic Laboratory Report No. 59 (1963)
- Wave induced oscillations in harbors of arbitrary shape, "Lee, J.J.", W.M. Keck Laboratory, California Institute of Technology, ~, pp.Report No. KH-20 (1969)
- Mei, C.C., "The applied dynamics of ocean surface waves" (1989), World Scientific Publishing Co.
- Nagai, T., "Relationship of a moored vessel in a harbor and a long wave caused by wave groups", Proceedings of 24th ICCE, pp.847~860 (1994)
- Nakamura, T., "Performance of a resonator designed by the wave filter theory-applicability to a harbor", Proc. 25th Conf. on Coastal Eng., pp.1280~1292 (1996)
- Nakamura, T., "Wave protection performance of a resonator founded at harbor entrance", Proc. Coastal Eng., 45, pp.721~725 (1998)
- Poon, Y.K., "Application of physical model in long wave studies for the port of Long Beach", Proc. 26th ICCE, pp.1222~1235 (1998), ASCE
- Sakakibara, S., "Characteristics of low-frequency motions of ships moored inside ports and harbors on the basis of field observations", Marine Structures, 21, pp.196~223 (2008)
- Sawaragi, T., "Waves, sediment transport and structure", pp.390~ (1991), Gihodo Press