title: Active noise attenuation in ventilation windows.
abstract: 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.
authors.affiliation: Key Laboratory of Modern Acoustics and Institute of Acoustics, Nanjing University, Nanjing, 210093, People's Republic of China. hahfhy@yahoo.com.cn
authors.forename: Huahua
authors.initials: H
authors.lastname: Huang
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Qiu
authors.forename: Jian
authors.initials: J
authors.lastname: Kang
mesh_terms: D003198:Computer Simulation; D005160:Facility Design and Construction; D005240:Feasibility Studies; D020342:Finite Element Analysis; D008962:Models, Theoretical; D009038:Motion; D009624:Noise, Transportation / Q000517:prevention & control*; D009716:Numerical Analysis, Computer-Assisted; D011312:Pressure; D015203:Reproducibility of Results; D013997:Time Factors; D014691:Ventilation