Abstract
To effectively reduce noise from heat pump (HP) dryers equipped with various components that are potential noise sources, a contribution analysis of the noise generated by each component is necessary. In this study, the main sources of noise in a HP dryer were assumed to be the compressor, drying fan, drum, lower box fan, and PCB fan. A contribution analysis was performed by evaluating the correlation between the vibration signal for each component and the noise radiated from the HP dryer. The contribution of 31 independent components created by combining the coupled relationships among the five main noise sources was calculated. In addition, a contribution map was created for each component to represent the contribution at each frequency of interest. The use of these contribution maps not only enabled the determination of the noise contribution by each component but also provided an understanding of the coupled relationship among the noise sources at the frequency of interest. These contribution maps are expected to be applicable not only to dryers but also to mechanical systems with multiple noise sources.
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