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Active noise attenuation in ventilation windows.

Huahua Huang1, Xiaojun Qiu, Jian Kang

  • 1Key Laboratory of Modern Acoustics and Institute of Acoustics, Nanjing University, Nanjing, 210093, People's Republic of China. hahfhy@yahoo.com.cn

The Journal of the Acoustical Society of America
|July 27, 2011
PubMed
Summary
This summary is machine-generated.

Active noise control effectively reduces low-frequency noise through natural ventilation windows. Optimal placement of secondary sources in staggered double glazing windows achieves significant noise attenuation up to 390 Hz.

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Area of Science:

  • Acoustics
  • Building Physics
  • Noise Control Engineering

Background:

  • Natural ventilation windows can transmit low-frequency noise.
  • Active noise control (ANC) offers a potential solution for noise attenuation.
  • Staggered double glazing windows are designed for ventilation and natural light.

Purpose of the Study:

  • To investigate the feasibility of ANC for attenuating low-frequency noise through natural ventilation windows.
  • To develop and validate an analytical model for sound field prediction in the window system.
  • To optimize the placement of secondary sources for maximum noise reduction.

Main Methods:

  • Development of an analytical model based on the modal expansion method.
  • Validation of the analytical model using the finite element method (FEM).
  • Experimental investigation of active noise control performance with varying source and receiver configurations.

Main Results:

  • The analytical model accurately predicts the sound field and is validated by FEM.
  • Numerical and experimental results show good agreement.
  • Optimal placement of secondary sources at the bottom center of the staggered window yields the best attenuation.
  • Effective control frequency range extends up to 390 Hz for a single-channel ANC system.

Conclusions:

  • Active noise control is a feasible technique for reducing low-frequency noise transmission through natural ventilation windows.
  • The developed analytical model provides a reliable tool for ANC simulations in such systems.
  • Optimized secondary source placement is crucial for maximizing noise reduction effectiveness.