유체에 잠긴 원통형 실린더의 파동 분산 특성|RISS 상세보기

다국어 초록 (Multilingual Abstract)

This paper deals with the dispersion relation of the waves sustained in a cylindrical shell submerged in the fluid. The waveguide finite method and the boundary element method are used to predict the dispersion characteristic of the cylindrical shell. The dispersion diagram of the cylinder is estimated from the eigenvalue problem and the forced vibration response. It follows that the water- loading leads to the decrease of the cut-on frequencies and the phase speeds of the bending waves. On the contrary, the longitudinal waves and the torsional waves are hardly affected by the fluid, and therefore the order of the cut-on frequencies of the waves is changed. The acoustic dispersion diagram is also estimated from the forced acoustic response to identify the characteristics of the wave radiated to the fluid. It follows that the acoustic waves on and near the surface of the cylinder are the same as those in the structure. But at the far field the acoustic waves caused by subsonic waves e.g., the bending waves disappear as the increase of the distance. Conclusively, the characteristics of waves in cylindrical shells are significantly affected by water-loading in terms of the cut-on frequency, the wave speed, the order of the cut-on and radiation.

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참고문헌 (Reference)

1 유정수, "외부 유체와 연성된 도파관의 진동 및 소음 해석 기법" 한국음향학회 29 (29): 448-457, 2010

2 손정우, "실린더형 셸 구조물의 모드 특성 및 진동제어:공기중 및 수중 실험결과 비교" 한국소음진동공학회 19 (19): 899-906, 2009

3 한승진, "수중 원통형 구조물의 총 음향방사파워 예측" 한국소음진동공학회 24 (24): 876-882, 2014

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5 Ryue, J., "Wave Propagation in Railway Tracks at High Frequencies" 440-446, 2007

6 Finnveden, S., "Input Power to Waveguides Calculated by a Finite Element Method" 305 (305): 641-658, 2007

7 Nilsson, C. M., "A Waveguide Finite Element and Boundary Element Approach to Calculating the Sound Radiated by Railway and Tram Rails" 321 (321): 813-836, 2009

8 Park, Y. J., "A Study on the Modal Characteristics of Submerged Cylindrical Shell" 284-285, 2003