# Influence of different friction coefficients on vibration and noise of helical gear system after modification

The vibration noise of helical gear system with modified friction coefficient of 0.1 is calculated. In order to study the influence of modified helical gear vibration noise with different friction coefficient, the vibration noise of helical gear system with modified friction coefficient of 0, 0.05 and 0.1 is compared and analyzed. The vibration noise of helical gear system with modified friction coefficient of 0 and 0.05 is calculated by boundary element method.

① Simulation results of vibration and noise of helical gear system when the friction coefficient is 0 after modification

The sound pressure nephogram of helical gear system with modified friction coefficient of 0 at 230hz, 460hz, 690hz, 920hz and 1150hz calculated by boundary element method is shown in Fig. 1 ~ 5. Figure 1 shows that the maximum sound pressure calculated at 230hz is 60.4db. Figure 2 shows that the maximum sound pressure calculated at 460hz is 64.7db. Figure 3 shows that the maximum sound pressure calculated at 690hz is 67.1db. Figure 4 shows that the maximum sound pressure calculated at 920hz is 71.1db. Figure 5 shows that the maximum sound pressure calculated at 1150hz is 83.6db.

② Simulation results of vibration and noise of helical gear system with modified friction coefficient of 0.05

The sound pressure nephogram of helical gear system with modified friction coefficient of 0 at 230hz, 460hz, 690hz, 920hz and 1150hz calculated by boundary element method is shown in Fig. 6 ~ 10. Figure 6 shows that the maximum sound pressure calculated at 230hz is 64.2db. Figure 7 shows that the maximum sound pressure calculated at 460hz is 68.1db. Figure 8 shows that the maximum sound pressure calculated at 690hz is 72.7db. Figure 9 shows that the maximum sound pressure calculated at 920hz is 77.4db. Figure 10 shows that the maximum sound pressure calculated at 1150hz is 88.1db.

③ Comparison of vibration and noise of helical gear system with different friction coefficients after modification

Comparison of sound pressure values of helical gear system at 230hz, 460hz, 690hz, 920hz and 1150hz when the friction coefficient is 0, 0.05 and 0.1 after modification. With the increase of friction coefficient, the sound pressure at each frequency increases with the increase of friction coefficient. For visual representation, the comparison histogram of sound pressure values with different friction coefficients is shown in Figure 11.

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