Acoustic beamforming through a thin plate using vibration measurements

Area of Science:

• Acoustics
• Vibrational Analysis
• Signal Processing

Background:

• Identifying acoustic sources through structures like walls is challenging.
• Existing methods may struggle with filtering incident sound fields.
• Applications include noise reduction in vehicles.

Purpose of the Study:

• To propose a methodology for localizing acoustic sources using induced vibrations.
• To couple Force Analysis Technique (FAT) with beamforming for enhanced source identification.
• To demonstrate the feasibility of this combined approach.

Main Methods:

• Measuring airborne induced vibrations of a thin structure.
• Applying Force Analysis Technique (FAT) to determine the parietal pressure field.
• Utilizing beamforming for acoustic source localization based on the identified pressure field.

Main Results:

• Theoretical coupling of FAT and beamforming was analyzed.
• Experimental validation confirmed the feasibility of the proposed methodology.
• The approach shows relevance for practical applications like in-vehicle noise analysis.

Conclusions:

• The combined FAT and beamforming method effectively localizes acoustic sources.
• This technique offers a practical solution for identifying sound sources through thin structures.
• The study validates the approach for real-world scenarios, such as differentiating interior and exterior noise in vehicles.