Abstract
Tooth surface cracks are considered as the early stage of the development of tooth surface spalling failure. Understanding the excitation mechanism of surface cracks has a great significance in the early diagnosis of spalling faults. However, there are few studies on the dynamic modelling of surface cracks, and the influence mechanism of surface cracking on the dynamic characteristics of a gear system is also not yet clear during its propagation process. Thus, an analytical calculation model of the meshing stiffness of gear with tooth surface crack is developed. Then, a dynamic model of a spur gear system with six degrees of freedom (DOF) is established based on the proposed surface crack calculation model. The effects of surface crack propagation on the meshing stiffness and dynamic characteristics of gear system are investigated. The results show that the side frequencies of dynamic transmission error (DTE) are more sensitive than those of the acceleration responses during the surface crack propagation, which is more favorable to the surface crack fault diagnosis. Compared to the traditional spalling fault model, the proposed model can accurately characterize the dynamic characteristics of a gear system with the early spalling defect.
Highlights
Gearboxes are widely applied in the power transmission field [1,2,3]
The effects of surface crack propagation on the meshing stiffness and dynamic characteristic of gear system are investigated, which is conducive to the diagnosis and monitoring of the early spalling failure of a gear system
The According to the parameters of a spur gear system shown in Table 1, the meshing stiffness and dynamic responses of the gear system with surface crack is calculated
Summary
Gearboxes are widely applied in the power transmission field [1,2,3]. as an vital component of a gearbox, gears often operate in stressful conditions, such as excessive service load, poor lubrication, or high temperature [4], and some faults related to gears can be observed. Aiming to study the dynamical performance of the gear system with spalling failures, some spalling fault modelling methods have been proposed [20,21]. Ma et al [28] presented an improved mesh stiffness computation method for gears with a spalling fault by considering the influence of extended tooth contact. An analytical calculation model of meshing stiffness of the gear with tooth surface crack fault is proposed in the paper. The effects of surface crack propagation on the meshing stiffness and dynamic characteristic of gear system are investigated, which is conducive to the diagnosis and monitoring of the early spalling failure of a gear system.
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