Abstract
In the design of driving systems, silent chains have extensively replaced roller chains thanks to annoying noise problems. For some types of cab-motorcycles, especially sheet-frame cabs, however, the annoying noise generated by silent chains is still not acceptable. In this study, silent chain noise of cab motorcycles is investigated first by order analysis and time-frequency (TF) analysis of measured noise, and second by the analysis of noise-origination, transmission and amplification via frame. The noise mechanism can therefore be precisely uncovered. Some experiments have been conducted to discover three primary issues of a noise problem, i.e., noise source, transmission path, and response. Additionally, a mode shape (1,3) at 1650 Hz can be constructed based on the running mode principle to interpret a dominant structure-borne noise.
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