Multiple acoustic diffraction around rigid parallel wide barriers

Area of Science:

• Acoustics and Wave Propagation
• Computational Physics
• Applied Mathematics

Background:

• Acoustic diffraction is crucial for understanding sound propagation in urban and architectural environments.
• Evaluating multiple diffraction effects from parallel barriers presents significant computational challenges.
• Existing methods often struggle with accuracy near diffracting edges and complex geometries.

Purpose of the Study:

• To develop and validate a new ray-based method for analyzing multiple acoustic diffraction.
• To accurately model sound wave interactions with multiple, parallel, rigid barriers of equal height.
• To provide a versatile tool for predicting acoustic fields in complex environments.

Main Methods:

• The method is based on the Geometrical Theory of Diffraction (GTD).
• It extends the exact boundary solution for a rigid wedge.
• Ray tracing techniques are employed to track wave propagation and diffraction.

Main Results:

• The proposed method successfully evaluates multiple acoustic diffraction by parallel barriers.
• It accurately determines diffraction along arbitrary directions and at various receiver locations.
• Results show good agreement with numerical simulations and the boundary element method.

Conclusions:

• The presented ray-based method offers a valid and efficient approach for multiple acoustic diffraction analysis.
• This technique is particularly useful for scenarios involving parallel barriers of equal height.
• The method provides accurate predictions, including near shadow and reflection boundaries.