Abstract
This paper describes theoretically the feedback effect of the secondary source on the primary source in a monopole system for active attenuation of noise in a duct, and gives a more accurate mathematical model. Based on the model mentioned above, a new monopole system called the Analogue Compensating Monopole System, or ACM-System for short, is established. An analogue method for compensating the non-ideal phase response of the system is suggested and discussed, and measures for improving the non-ideal amplitude response are proposed. In order to improve the working stability of the system, a directional sound detector is introduced, and the absolute stability condition of the ACM-System is given. Test results show that the method for compensating for the phase errors and improving the amplitude characteristics of the system is effective. Experimental data from the ACM-System in conditions of flowing and quiet air in the duct are processed. Test results show that the ACM-System has a noise reduction ability superior to that of other monopole systems, whether in narrow or wider frequency bandwidths.
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