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.

A Review on Natural Ventilation-enabling Façade Noise Control Devices for Congested High-Rise Cities

“…However, the additional noise reduction due to the active control was found to be limited to below 5 dB, except at some individual frequencies, at which the noise reduction was above 10 dB. In addition, as in the study of Huang et al [69], noise reduction improvement could only be found at frequencies below the first gap mode cut-on.…”

“…Through the use of scale model experiments, Huang et al [69] showed that the control was only satisfactory at frequencies below the cut-on frequency of the first odd mode in the gap direction. They found that there was a 20 dB additional noise reduction when the active control was applied.…”

Invisible speakers in home windows for simultaneous auxiliary audio playback and active noise cancellation

“…The idea of active noise cancellation (ANC) as a possible solution for home window noise attenuation has been previously studied [3,[11][12][13]. In an ANC system, the control algorithm drives an actuator (e.g.…”

Performance Evaluation of Active Windows Using Speech Intelligibility

“…However, this solution is less effective in summer times or in southern countries where the windows need to be frequently opened. Several active noise control (ANC) systems have been applied to the open windows to solve this problem [1]- [3]. The systems were proved to reduce the transmitted exterior noise when the windows were open.…”

“…The systems were proved to reduce the transmitted exterior noise when the windows were open. Huang investigated the active window system that was constructed by staggering the opening sashes of a spaced double glazing window to allow ventilation and natural light [1]. Kwon proposed an active window system that consisted of reference sensors installed outside the room and control sources installed on the window frame.…”