Abstract
This work investigated the noise characteristics of a simplified gear system through the axial excitation of helical gears. The simplified gear system was modeled as a shaft-bearing-plate with helical gears. Four pole parameters of the shaft-bearing-plate system were used to determine the longitudinal behavior of the system. The noise was modeled by sound radiation from the vibration of a circular plate mounted in an infinite baffle. The shaft-bearing-plate model was validated by finite element and acoustic analyses. Using the validated model, the noise characteristics of the system were investigated. According to the results, doubling the input torque increased the sound pressure level. An increase in plate thickness reduced the plate displacement, but did not reduce the noise. The noise level was lower for aluminum and magnesium plates than steel plates. An increase in the shaft diameter decreased the sound pressure level. Finally, a shorter shaft led to higher natural frequencies and sound pressure levels.
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