Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/25419
Title: Causal impedance matching for broadband hybrid noise absorption
Authors: Yuan, J 
Issue Date: 2003
Publisher: Acoustical Society of America
Source: Journal of the Acoustical Society of America, 2003, v. 113, no. 6, p. 3226-3232 How to cite?
Journal: Journal of the Acoustical Society of America 
Abstract: The complementary strengths and weaknesses of passive and active noise control (ANC) methods have motivated many researchers to develop hybrid noise absorbers that integrate both control strategies. The impedance matching technique (IMT) is the most effective for such a purpose. An unsolved problem with available IMT schemes is the a priori reference signal that limits IMT applications. This study proposes the use of the forward wave, available by the two-microphone method, as the reference signal. Due to inevitable errors in wave separation and inlet reflection of the control signal, the absorber becomes a feedback system. A simple and stable ANC is developed for impedance matching without the a priori reference signal. The proposed absorber has an absorption coefficient of 0.9 or above in a frequency range of 60-850 Hz. It is stable in the presence of sensor mismatch and robust with respect to significant variation of inlet boundary conditions.
URI: http://hdl.handle.net/10397/25419
ISSN: 0001-4966
EISSN: 1520-8524
DOI: 10.1121/1.1572148
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