Improving accuracy of acoustic source localization in anisotropic plates.

Area of Science:

• Acoustics
• Materials Science
• Mechanical Engineering

Background:

• Acoustic source localization in anisotropic plates is crucial for structural health monitoring.
• Previous methods relied on accurate time difference of arrivals (TDOA) measurements, which can be challenging.
• Sensor clusters are used to determine acoustic source direction without prior knowledge of material properties.

Purpose of the Study:

• To improve an existing acoustic source localization technique for anisotropic plates.
• To address accuracy limitations related to TDOA measurements.
• To experimentally verify improvements on both flat and curved composite plates.

Main Methods:

• Investigated difficulties in the original acoustic source localization technique.
• Proposed two modifications to enhance TDOA accuracy: using initial signal parts (first dip and peak) and minimizing sensor proximity in clusters.
• Applied these modifications to the beamforming technique to assess their broader applicability.

Main Results:

• The accuracy of acoustic source localization was significantly improved through the proposed modifications.
• Experimental verification on anisotropic flat and curved composite plates confirmed the enhanced prediction accuracy.
• The modifications showed potential for improving other sensor cluster-based techniques like beamforming.

Conclusions:

• The refined TDOA measurement approach substantially enhances acoustic source localization accuracy for anisotropic plates.
• The modifications are effective on both flat and curved composite structures.
• These improvements offer a more robust method for acoustic sensing in composite materials.