Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/18850
Title: Reactive control of subsonic axial fan noise in a duct
Authors: Liu, Y
Choy, YS 
Huang, L
Cheng, L 
Issue Date: 2014
Publisher: Acoustical Society of America
Source: Journal of the Acoustical Society of America, 2014, v. 136, no. 4, p. 1619-1630 How to cite?
Journal: Journal of the Acoustical Society of America 
Abstract: Suppressing the ducted fan noise at low frequencies without varying the flow capacity is still a technical challenge. This study examines a conceived device consisting of two tensioned membranes backed with cavities housing the axial fan for suppression of the sound radiation from the axial fan directly. The noise suppression is achieved by destructive interference between the sound fields from the axial fan of a dipole nature and sound radiation from the membrane via vibroacoustics coupling. A two-dimensional model with the flow effect is presented which allows the performance of the device to be explored analytically. The air flow influences the symmetrical behavior and excites the odd in vacuo mode response of the membrane due to kinematic coupling. Such an asymmetrical effect can be compromised with off-center alignment of the axial fan. Tension plays an important role to sustain the performance to revoke the deformation of the membrane during the axial fan operation. With the design of four appropriately tensioned membranes covered by a cylindrical cavity, the first and second blade passage frequencies of the axial fan can be reduced by at least 20 dB. The satisfactory agreement between experiment and theory demonstrates that its feasibility is practical.
URI: http://hdl.handle.net/10397/18850
ISSN: 0001-4966
EISSN: 1520-8524
DOI: 10.1121/1.4894798
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