Abstract
The purpose of this study is to explore the effects of sound elimination in a cylindrical duct by combining a reactive muffler and active noise control (ANC) system. Besides the exploration via experiment of the combined noise control system, predictions of desired signals in ANC system are proposed for this hybrid system. These predictions are Grey prediction based on Grey theory and signal processing for path impulse response function. In the experiment, the effects of sound elimination (such as transmission loss and insertion loss) are compared between cases with ANC systems installed before the muffler and after the muffler. The results indicate several conclusions that (1) the sequence of arrangement of muffler can influence the results of active noise control, (2) the effect of noise reduction in ANC system is influenced extremely by reference signal received, (3)the hybrid system has the advantages over a traditional muffler when the muffler is not designed for the frequency of the noise, and (4) predictions of the desired signals such as Grey prediction or path impulse response function could give a better control for the hybrid system.
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