Journal of the Society of Naval Architects of Korea (대한조선학회논문집)

The Society of Naval Architects of Korea (대한조선학회)
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Energy Flow Finite Element Analysis for High Frequency Acoustic and Vibrational Prediction of Complicated Plate Structures Considering Fluid-Structure Interaction

복합평판구조물의 고주파수 대역 유체/구조 연성 소음진동예측을 위한 에너지흐름유한요소해석

  • Tae-Heum Yoon (Korea Marine Equipment Research Institute) ;
  • Young-Ho Park (Department of Naval Architecture and Marine Engineering, Changwon National University)
  • 윤태흠 (한국조선해양기자재연구원) ;
  • 박영호 (국립창원대학교 조선해양공학과)
  • Received : 2022.11.27
  • Accepted : 2022.12.28
  • Published : 2023.02.20
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Abstract

In this paper, the Energy Flow Finite Element Analysis (EFFEA) was performed to predict the acoustic and vibrational responses of complicated plate structures considering improved Fluid-Structure Interaction (FSI). For this, a new power transfer relationship was derived at the area junction where two different fluids are in contact on both sides of the plate. In order to increase the reliability of EFFEA of complicated plate structures immersed in a high-density fluid, the corrected flexural wavenumber and group velocity considering fluid-loading effect were derived. As the specific acoustic impedance of the fluid in contact with the plate increases, the flexural wavenumber of the plate increases. As a result, the flexural group velocity is reduced, and the spatial damping effect of the flexural energy density is increased. Additionally, for the EFFEA of arbitary-shaped built-up structures, the energy flow finite element formulation for the acoustic tetrahedral element was newly performed. Finally, for validation of the derived theory and developed software, numerical applications of complicated plate structures submerged in seawater or air were successfully performed.

Keywords

Acknowledgement

이 논문은 2021~2022년도 창원대학교 자율연구과제 연구비 지원으로 수행된 연구결과임.

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