Key Laboratory of Modern Acoustics and Institute of Acoustics, Nanjing University, Nanjing, 210093, People's Republic of China.
J Acoust Soc Am. 2011 Jul;130(1):176-88. doi: 10.1121/1.3596457.
The feasibility of applying active noise control techniques to attenuate low frequency noise transmission through a natural ventilation window into a room is investigated analytically and experimentally. The window system is constructed by staggering the opening sashes of a spaced double glazing window to allow ventilation and natural light. An analytical model based on the modal expansion method is developed to calculate the low frequency sound field inside the window and the room and to be used in the active noise control simulations. The effectiveness of the proposed analytical model is validated by using the finite element method. The performance of the active control system for a window with different source and receiver configurations are compared, and it is found that the numerical and experimental results are in good agreement and the best result is achieved when the secondary sources are placed in the center at the bottom of the staggered window. The extra attenuation at the observation points in the optimized window system is almost equivalent to the noise reduction at the error sensor and the frequency range of effective control is up to 390 Hz in the case of a single channel active noise control system.
研究了通过自然通风窗将低频噪声传入房间时应用有源噪声控制技术的可行性，该通风窗采用交错开启双层玻璃窗的窗扇来实现通风和采光。建立了基于模态展开法的分析模型，用于计算窗内和室内的低频声场，以便用于有源噪声控制模拟。通过有限元法验证了所提出的分析模型的有效性。比较了具有不同源和接收器配置的窗口的主动控制系统的性能，发现数值和实验结果吻合较好，当次级声源放置在交错窗口底部的中心时，可获得最佳效果。在优化的窗口系统中，观察点的额外衰减几乎等于误差传感器的噪声降低，在单通道有源噪声控制系统的情况下，有效控制的频率范围高达 390Hz。
