Numerical Investigation of Transverse Parabolic Curvature Effects on the Dynamic Behavior of Fluid-Coupled Stiffened Metallic Shells

Document Type : Dynamics, Vibrations, and Control

Authors

1 PhD student, Imam Hossein University , Tehran, Iran

2 Professor, Imam Hossein University , Tehran, Iran

Abstract

The extensive applications of stiffened shells in shipbuilding necessitate a thorough understanding of the dynamic behavior of vessel hull structures within their actual operational environments. Among various factors, fluid-structure interaction and parameters influencing hull geometry are particularly significant. This study investigates the modal analysis of stiffened metallic parabolic shells, employing the finite element software ABAQUS. The primary focus is on the impact of transverse parabolic curvatures on the shell's fundamental natural frequency under different fluid-shell interaction scenarios. To validate the numerical method, the effect of wetted surface area on the vibrational frequencies of cylindrical shells in contact with water was assessed at various immersion depths. Evaluation of 80 extracted vibrational modes across four shell thicknesses revealed a distinct frequency peak at a specific curvature (C/b = 0.1). Notably, the location of this peak remained independent of changes in shell thickness and water contact height, being solely dependent on shell geometry (shape and curvature). The peak frequency value increased with increasing shell thickness. In the absence of water contact (a0), this trend was observed at thicknesses of 5 to 20 mm, with peak frequencies of 28.916, 41.383, 44.481, and 47.923 Hz, respectively.

Graphical Abstract

Numerical Investigation of Transverse Parabolic Curvature Effects on the Dynamic Behavior of Fluid-Coupled Stiffened Metallic Shells

Keywords

Main Subjects

References

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Aerospace Mechanics
Volume 21, Issue 3 - Serial Number 81
Autumn
October 2025
Pages 25-46

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History

  • Receive Date: 10 April 2025
  • Revise Date: 16 August 2025
  • Accept Date: 18 September 2025
  • Publish Date: 29 September 2025

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