Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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Free Vibration Analysis of Perforated Rectangular Plates Submerged in Fluid

유체에 잠긴 다공 직사각평판의 고유진동 해석

  • 유계형 (전북대학교 대학원 기계공학과) ;
  • 권대규 (전북대학교 메카트로닉스 연구센터) ;
  • 정경훈 (한국원자력연구소) ;
  • 이성철 (전북대학교 기계항공시스템공학부, 공업기술연구소)
  • Published : 2003.03.01
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Abstract

This paper presented an experimental modal analysis of clamped perforated rectangular plates submerged in water. The penetration of holes in the plates had a triangular pattern with P/D (pitch to diameter) 1.750, 2.125, 2.500, 3.000 and 3.750. The natural frequencies of the perforated plates in air were obtained by the Rayleigh-Ritz method and compared with the experimental results. Good agreement was obtained between the analytical solution and experimental result. The experimental results in water showed that the mode shapes are not sensitive to the depth of submergence. The natural frequencies were shown to decrease drastically once the perforated plates come in contact with water. However, the natural frequencies decrease with the depth of submergence until a certain depth is reached, and become the asymptotic values beyond this depth of submergence. The depth of submergence did not affect the damping ratio greatly.

Keywords

References

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