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Adaptive beamforming for array imaging of plate structures using lamb waves.

Marcus Engholm¹, Tadeusz Stepinski

¹Uppsala University, Signals and Systems Group, Uppsala, Sweden. marcus.engholm@gmail.com

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

|December 16, 2010

Summary

This summary is machine-generated.

This study introduces a Minimum Variance Distortionless Response (MVDR) beamforming approach for Lamb wave monitoring of plate structures. The MVDR method enhances resolution and mode suppression compared to standard delay-and-sum (DAS) beamforming.

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Area of Science:

Structural Health Monitoring
Non-Destructive Testing
Acoustic Wave Propagation

Background:

Lamb waves are effective for monitoring plate structures over large areas using active arrays and beamforming.
Dispersion and multiple propagating modes present challenges in Lamb wave analysis.
Existing methods primarily use delay-and-sum (DAS) beamforming, with mode reduction via frequency selectivity and transducer design.

Purpose of the Study:

To present a Minimum Variance Distortionless Response (MVDR) beamforming approach for Lamb wave analysis.
To utilize a uniform rectangular array (URA) and a single transmitter for improved Lamb wave monitoring.
To address and mitigate known limitations of the MVDR approach for enhanced robustness.

Main Methods:

Implementing an MVDR beamforming algorithm tailored for Lamb waves.
Employing a uniform rectangular array (URA) with a single transmitter.
Utilizing theoretically calculated dispersion curves for dispersion compensation.
Addressing MVDR's signal cancellation and robustness issues with established techniques from active imaging.

Main Results:

The MVDR approach demonstrated superior performance over standard DAS beamforming.
Achieved higher resolution in Lamb wave signal processing.
Exhibited enhanced capabilities in suppressing side lobes and interfering Lamb modes.
Validated through evaluation on both simulated and experimental data.

Conclusions:

The proposed MVDR approach offers significant improvements for Lamb wave-based structural health monitoring.
It provides enhanced resolution and better suppression of unwanted modes compared to conventional DAS beamforming.
The study successfully adapted and validated MVDR for robust Lamb wave analysis, overcoming its known limitations.