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Modeling Full-Field Transient Flexural Waves on Damaged Plates with Arbitrary Excitations Using Temporal Vibration

Dan-Feng Wang1, Kuo-Chih Chuang1, Jun-Jie Liu2

  • 1Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province, School of Aeronautics and Astronautics, Institute of Applied Mechanics, Zhejiang University, Hangzhou 310027, China.

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|August 26, 2022
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Summary

This study introduces a semi-analytical method to model flexural wave propagation in cracked plates. The technique uses vibration characteristics and Laser Doppler Vibrometer (LDV) validation to reveal crack information.

Keywords:
flexural wavessemi-analytical methodstructural health monitoringvibrations

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Area of Science:

  • Structural health monitoring
  • Vibrational mechanics
  • Non-destructive testing

Background:

  • Cracked plate structures pose challenges for wave propagation analysis.
  • Accurate modeling of flexural waves is crucial for damage detection.
  • Existing methods may lack efficiency or broad applicability.

Purpose of the Study:

  • To develop an efficient semi-analytical method for modeling flexural wave propagation in cracked plates.
  • To analyze the influence of damage on wave propagation paths.
  • To validate the method using experimental data.

Main Methods:

  • Superposition of vibrational normal modes for transient wave propagation analysis.
  • Integration of a vibration-based transient model with power flow analysis.
  • Experimental validation using a non-contact scanning Laser Doppler Vibrometer (LDV) system.

Main Results:

  • The proposed method accurately models flexural wave propagation in cracked plates.
  • The influence of damage on wave propagation paths was successfully analyzed.
  • Experimental results confirmed the method's capability to reveal crack information.

Conclusions:

  • The developed semi-analytical method provides an efficient approach for modeling flexural waves in cracked structures.
  • This technique enables the detection and characterization of cracks through wave propagation analysis.
  • The study highlights the potential of vibration-based methods for structural health monitoring.