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This is a Quantitative Study study.

Random Incidence Sound Absorption of Porous Materials With Periodic Holes of Decreasing Profile

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Finite element simulations revealed high sound absorption performance in porous materials, highlighting acoustic design benefits.

The study found sound absorption coefficients exceeding 0.99 under various conditions, indicating effective acoustic performance.
Analysis showed that periodic holes improve low-frequency sound absorption in porous materials, enhancing acoustic applications.
Higher airflow resistivity leads to lower sound absorption with increased incidence angles, suggesting design limitations.
Finite element simulations were utilized to measure sound absorption and surface impedance, emphasizing advanced material analysis.

Laly et al. (2025) studied this question.

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