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Purpose <p>This work aims to model the propagation of ultrasonic guided waves in anisotropic viscoelastic single and multilayered plates subjected to fluid loading, with a focus on accurately identifying and characterizing different propagation modes.&#xa0;</p> Method <p>The spectral collocation method is employed to establish the equations of motion and boundary conditions. A novel hybrid separation algorithm is introduced to distinguish between various wave propagation modes. Dispersion curves in 2D and 3D are generated for isotropic, orthotropic, and multilayered anisotropic viscoelastic laminates with both symmetric and antisymmetric stacking sequences under water and air loading.</p> Results <p>The analysis highlights the effects of frequency and fluid loading on vibrational states and mode characteristics. The proposed approach shows excellent accuracy, with validation against analytical solutions yielding an error on the order of 10⁻⁶. The hybrid algorithm demonstrates strong capabilities in separating Lamb and Scholte modes, and in clearly identifying symmetric and antisymmetric modes, while ensuring good convergence and fast computation.</p> Conclusion <p>The developed modeling framework and hybrid separation algorithm provide an efficient and accurate tool for analyzing ultrasonic guided wave propagation in complex anisotropic viscoelastic structures under fluid loading, offering both precision and computational efficiency.</p>

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Hybrid Spectral Approach for Ultrasonic Guided Wave Dispersion in Fluid-Loaded Anisotropic Viscoelastic Multilayered Structures

  • 期刊论文

  • 发表日期：

    2025年10月27日

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  • Zitouni Ismaine,
  • Rhimini Hassan,
  • Chouaf Abdelkerim

摘要

Purpose

This work aims to model the propagation of ultrasonic guided waves in anisotropic viscoelastic single and multilayered plates subjected to fluid loading, with a focus on accurately identifying and characterizing different propagation modes. 

Method

The spectral collocation method is employed to establish the equations of motion and boundary conditions. A novel hybrid separation algorithm is introduced to distinguish between various wave propagation modes. Dispersion curves in 2D and 3D are generated for isotropic, orthotropic, and multilayered anisotropic viscoelastic laminates with both symmetric and antisymmetric stacking sequences under water and air loading.

Results

The analysis highlights the effects of frequency and fluid loading on vibrational states and mode characteristics. The proposed approach shows excellent accuracy, with validation against analytical solutions yielding an error on the order of 10⁻⁶. The hybrid algorithm demonstrates strong capabilities in separating Lamb and Scholte modes, and in clearly identifying symmetric and antisymmetric modes, while ensuring good convergence and fast computation.

Conclusion

The developed modeling framework and hybrid separation algorithm provide an efficient and accurate tool for analyzing ultrasonic guided wave propagation in complex anisotropic viscoelastic structures under fluid loading, offering both precision and computational efficiency.