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Modeling wave scattering in impedance-lined duct networks with expansion chambers
Abdulwahed Alrashdi1, Naif Alkuhayli1, Muhammad Safdar2
1Mathematics Department, College of Science, Jouf University, Sakaka, Saudi Arabia.
Plos One
|April 15, 2026
Summary
This study introduces a framework for predicting sound wave scattering in lined ducts, crucial for noise control. Results show acoustic linings significantly improve sound attenuation by altering wave propagation and resonance.
Area of Science:
- Acoustics
- Engineering Noise Control
- Wave Propagation
Background:
- Ducted systems with expansion chambers and dissipative linings are common in noise control.
- Predicting acoustic wave scattering in these systems is essential for effective noise mitigation.
Purpose of the Study:
- To develop a general framework for predicting acoustic wave scattering in ducted systems with expansion chambers and dissipative linings.
- To analyze the impact of acoustic linings on wave propagation and resonance behavior.
Main Methods:
- Utilizing orthogonal modal expansions to represent the acoustic field in duct segments.
- Enforcing continuity conditions at interfaces to determine reflected and transmitted wave content.
- Verifying the model with benchmark configurations and a piston-type source.
Main Results:
- Acoustic linings significantly alter modal wavenumbers and mode coupling, impacting propagation and resonance.
- Double-lined expansion chambers enhance modal interactions and broaden the frequency range of attenuation.
- The proposed formulation is computationally efficient and adaptable to practical designs.
Conclusions:
- The developed framework accurately predicts acoustic wave scattering in lined ducted systems.
- Acoustic linings are effective in improving noise attenuation, with double-lined chambers offering enhanced performance.
- The method is suitable for designing and optimizing noise mitigation components in various applications.
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