Abstract
For gear noise reduction, it is important to clarify the physical mechanism of
each resonance peak. In this study, the three-dimensional (rotational, transverse, axial and
tilting) vibrations of rotating helical gears and gear shafts, the three-directional (X, Y, Z)
vibrations of bearing holders and the radiated gear noise are measured simultaneously.
Moreover, an FEM dynamic analysis was conducted to identify the measured three-dimensional
vibrations of helical gears and gear shafts.
As a result, the relationship between the three-dimensional vibration behavior of helical gears
and gear shafts and the radiated gear noise was successfully clarified. In particular, transverse
and tilting vibrations of helical gear shafts were more effective to the vibrations of bearing
holders that correlated with the radiated gear noise. However, axial vibration was less
effective to the vibrations of bearing holders, but was very effective to the radiated gear noise.
Keywords - Gear, vibration, noise, helical gear, power transmission