Surface contributions to scattered sound power using non-negative intensity.

Area of Science:

• Acoustics
• Wave Scattering
• Numerical Methods

Background:

• Identifying sound-scattering surfaces is crucial for acoustic analysis.
• Acoustic intensity and sound power are key metrics for characterizing scattering.
• Existing methods may have limitations in near and far-field assessments.

Purpose of the Study:

• To introduce and validate a non-negative intensity method for identifying sound-scattering surface areas.
• To predict scattered sound power and acoustic intensity in both near and far acoustic fields.
• To compare back-calculated non-negative intensity from far-field areas with direct surface measurements.

Main Methods:

• Utilized non-negative intensity to pinpoint surface areas contributing to scattered sound power.
• Calculated scattered acoustic intensity and sound power in the acoustic near field.
• Evaluated scattered acoustic intensity and sound power in the acoustic far field using full and partial receiver surface areas.
• Performed back-calculation of non-negative intensity from far-field data for comparison.

Main Results:

• Non-negative intensity successfully identified contributing surface areas for scattered sound power.
• Predictions in the acoustic near field were consistent with direct surface integration.
• Far-field analysis showed comparable results for full and partial receiver areas.
• Back-calculated non-negative intensity correlated well with directly obtained values.

Conclusions:

• The non-negative intensity method provides a robust approach for analyzing acoustic scattering.
• This technique is effective for both near-field and far-field acoustic assessments.
• The study demonstrates the applicability of non-negative intensity for diverse scatterer geometries.