| Summary: | 碩士 === 逢甲大學 === 機械工程學所 === 91 === This research, basing on acoustic theory, deduces the governing equation to Helmholtz resonator, and the boundary element method was chosen to be a numerical tool. The numerical result shows a good agreement with theory, which validates the reliability of computer program and numerical method in present method. Therefore, the silence effect of the specific frequency can be estimated precisely by means of considering design parameters decided by the dimension of the resonator. In this paper, the silence effect on the overall system is investigated when the Helmholtz resonator is installed in the air-intake hose of a motorcycle air-filter or carburetor’s connecting piper as an auxiliary silence element where the porous sound-absorbing material has also take into account. The result shows that the lower part of transmission loss have improved as the resonator installs on an air-filter. On the other hand, this research also verifies that the range of silenced frequency widens and promotes the silence effect in system when the porous sound-absorbing material applies in the resonator.
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