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Optimization of single-channel active noise control performance in a plenum window using the surface impedance
Johann Kay Ann Tan1, Liangfen Du2, Siu-Kit Lau1
1Department of Architecture, National University of Singapore, 4 Architecture Drive, Singapore 117566, Singapore.
The Journal of the Acoustical Society of America
|February 23, 2024
Summary
Active noise control (ANC) in plenum windows significantly reduces noise, with optimal source placement achieving 9.2 dB attenuation. Dual-channel systems further enhance performance up to 800 Hz.
Area of Science:
- Acoustics
- Mechanical Engineering
- Building Science
Background:
- Plenum windows can be a significant source of noise transmission in buildings.
- Effective noise reduction strategies are crucial for improving indoor acoustic comfort.
- Active noise control (ANC) offers a potential solution for mitigating noise through plenum windows.
Purpose of the Study:
- To investigate the implementation and optimization of active noise control (ANC) in plenum window designs.
- To determine the optimal placement of control sources for maximizing ANC performance.
- To evaluate the effectiveness of single-channel and dual-channel ANC systems in plenum windows.
Main Methods:
- Simulations of single-channel ANC configurations using the surface impedance approach (SIA).
- Systematic search for optimal control source localization within the plenum window.
- Experimental validation using a real-time ANC system and a scaled plenum window.
Main Results:
- Optimal single-channel ANC configuration achieved an average attenuation of 9.2 dB between 200-630 Hz.
- Error sensor placement was found to be non-critical for the ANC system's performance.
- A dual-channel ANC system extended effective control to approximately 800 Hz with 7.6 dB average attenuation.
Conclusions:
- The surface impedance approach (SIA) is a useful tool for optimizing ANC systems in plenum windows.
- Strategic placement of control sources is key to maximizing noise attenuation.
- ANC technology can effectively enhance acoustic comfort by reducing noise transmitted through plenum windows.
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