Abstract
Helmholtz resonators (HRs) are widely used to reduce narrow frequency band noise. In this paper, by using microphone and loudspeaker in HR as sensor and actuator, a sweeping HR with time-varying natural frequency, which can eliminate the complexity of changing the physical dimension of HR during operation, is developed. The natural frequency of the HR is continuously swept by using a time-varying Proportional-Integral (PI) controller. The main advantage of the proposed sweeping HR is without requiring of the accuracy value of the targeted control frequency. Finally, the experimental results are presented to verify the control performance of the proposed sweeping HR. Noise reduction of 6 dB in the 120–170 Hz band was obtained when one sweeping HR was installed in a rigid duct.
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