An active noise barrier with unidirectional secondary sources |
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| Authors: | Weisong Chen Wei Rao Hequn Min Xiaojun Qiu |
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| Institution: | aKey Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093, China;bAnhui Normal University, Wuhu 241000, China |
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| Abstract: | An active noise barrier with unidirectional secondary sources is investigated in this paper, where the unidirectional secondary source consists of two closely located loudspeakers with pre-adjusted phase difference. The secondary sound field of the unidirectional sources is adjusted to maximally match the primary sound field in the shadow zone behind the barrier. It is shown both numerically and experimentally that the noise reduction performance of the active noise barrier can be improved remarkably by replacing monopoles with the unidirectional sources. The mechanism for the improvement is also investigated. |
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| Keywords: | Active noise barrier Unidirectional secondary source Phase adjustment |
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