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Related Experiment Videos

Wave localization on a submerged cylindrical shell with rib aperiodicity.

M H Marcus1, B H Houston, D M Photiadis

  • 1Naval Research Laboratory, Washington, DC 20375-5320, USA.

The Journal of the Acoustical Society of America
|April 17, 2001
PubMed
Summary

Stiffener variability in framed shells causes vibration localization. Numerical models accurately predict this phenomenon, linking resonance frequencies to geometric parameters like rib thickness and spacing.

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Area of Science:

  • Structural mechanics
  • Acoustics
  • Vibration analysis

Background:

  • Framed shells are crucial components in various engineering applications.
  • Understanding vibration behavior is essential for structural integrity and performance.
  • Stiffener imperfections can significantly alter dynamic responses.

Purpose of the Study:

  • To numerically investigate vibration localization in framed shells.
  • To analyze the impact of stiffener variability on shell vibrations.
  • To correlate localization phenomena with specific geometric parameters.

Main Methods:

  • Utilized an axisymmetric finite element (FE)-infinite element model.
  • Performed numerical simulations to predict vibratory response.
  • Compared numerical predictions with existing experimental data.

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Main Results:

  • Numerical results showed good agreement with experimental findings.
  • Two dominant structural resonances were identified for high circumferential orders (n > 10).
  • Vibration localization was directly linked to the sensitivity of resonance frequencies to geometric parameters.

Conclusions:

  • Stiffener variability is a key factor in vibration localization in framed shells.
  • Rib thickness variations primarily influence the first pass band.
  • Rib spacing variations predominantly affect the second pass band.