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A hybrid approach for simulating fluid loading effects on structures using experimental modal analysis and the

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This study introduces a hybrid method to find a structure's fluid-loaded resonance frequencies and damping using only in-air measurements. This approach simplifies experimental procedures for structural acoustics in heavy fluids.

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Area of Science:

  • Structural Acoustics
  • Fluid-Structure Interaction
  • Experimental and Numerical Methods

Background:

  • Determining fluid-loaded natural frequencies and damping experimentally is challenging and costly.
  • Heavy fluid loading significantly impacts structural vibration characteristics.
  • Accurate modeling of structural acoustics in fluid environments is crucial for many engineering applications.

Purpose of the Study:

  • To present a novel hybrid experimental-numerical approach for determining fluid-loaded resonance frequencies and damping.
  • To enable the calculation of these parameters from readily available in-air measurements.
  • To validate the proposed method against traditional in-water measurements.

Main Methods:

  • Combining experimentally obtained in-air mode shapes with simulated acoustic matrices from boundary element (BE) analysis.
  • Utilizing singular value decomposition and rational fraction polynomial fitting for accurate in-vacuo mode shape estimation.
  • Employing these mass-normalized mode shapes as basis modes for the in-water BE analysis.

Main Results:

  • The hybrid approach successfully predicted fluid-loaded natural frequencies and one-third octave loss factors for a test plate.
  • Good agreement was observed between the hybrid method's results and direct in-water measurements.
  • The study demonstrated the feasibility of inferring fluid-loaded properties from air measurements.

Conclusions:

  • The hybrid experimental-numerical method offers a viable and potentially more cost-effective alternative for characterizing fluid-loaded structures.
  • This approach simplifies the experimental process for obtaining critical dynamic parameters in heavy fluids.
  • Further examination of the limitations of this hybrid technique is warranted for broader applicability.