Acoustic emission localization in complex dissipative anisotropic structures using a one-channel reciprocal time...

Area of Science:

• Acoustics
• Materials Science
• Structural Health Monitoring

Background:

• Accurate localization of impact points in complex anisotropic structures is crucial for structural integrity.
• Conventional acoustic emission monitoring systems often struggle with diffuse field conditions and complex wave propagation.

Purpose of the Study:

• To develop a novel imaging method for precise impact point localization in challenging structural environments.
• To leverage the benefits of wave scattering, mode conversion, and reflections for enhanced source focusing.

Main Methods:

• Utilizes a reciprocal time reversal approach combined with inverse filtering.
• Employs a database of experimental Green's functions for wave propagation analysis.
• Implements a "virtual" imaging process for optimal wave field refocusing.

Main Results:

• Successfully demonstrated high-resolution impact point localization in a dissipative stiffened composite panel.
• Achieved accurate source position retrieval across various locations within the structure.
• Validated the robustness of the inverse filtering technique under diffuse field conditions.

Conclusions:

• The proposed method offers a simple yet effective alternative for acoustic emission source localization.
• It overcomes limitations of conventional systems by exploiting complex wave phenomena.
• This technique presents a promising advancement for structural health monitoring applications.