Influence of crack fault on the dynamical characteristics of a planetary gear transmission system

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (2) : 188-194.

XIAO Zhengming,XUN Lirong,CAO Jinxin

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Abstract

In view of the complex dynamic characteristics and high failure rate of planetary gearboxes, the failure mechanism of a transmission system was explored from the aspect of dynamics.The modified energy method was used to simulate the time-varying meshing stiffness of normal and cracked gears.The dynamic model of the planetary gear transmission system was established by using the lumped parameter method and considering the time-varying meshing parameters.The dynamical responses of the system in the normal and fault gear states were obtained, and the influence of crack failure on its dynamical characteristics was analyzed.The influence of crack fault on the dynamic responses of the planetary gears was investigated by gearbox bench tests.The frequency spectrum of the gear vibration signal was analyzed with the wavelet decomposition and EEMD method.The frequency domain characteristics of the system in the normal and fault gear states were compared, according to which the fault mechanism of the planetary gear transmission system was revealed.The results show that the dynamical model has high precision and can well describe the dynamic characteristics of the planetary gears system with faults.The modulation effect of the vibration of the transmission system caused by crack fault will lead to the sidebands near the gear meshing frequency, and the vibration energy of the fault gearbox is mainly concentrated in high frequency region.

Key words

planetary gear transmission / gear crack fault / dynamical response / fault test / influence

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XIAO Zhengming,XUN Lirong,CAO Jinxin. Influence of crack fault on the dynamical characteristics of a planetary gear transmission system[J]. Journal of Vibration and Shock, 2020, 39(2): 188-194

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