Simulation of spur gear dynamics and estimation of fault growth

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Analytically evaluating the influence of crack on the mesh stiffness of a planetary gear set (2014, background): “[7–9], the gear system is assumed to be perfect without friction and transmission error and the gear body is treated as solid.”
Machinery health prognostics: A systematic review from data acquisition to RUL prediction (2018, methodology): “This problem may be handled with the help of dynamic model analysis [371] or phenomenological model analysis [372] of a mechanical system.”
Mathematical modeling of gearbox including defects with experimental verification (2012, methodology): “Some researchers have assumed gear tooth deflection due to local Hertzian and bending deformation (Charri et al., 2009; Parey et al., 2006; Wu et al. 2008), which is based on the method developed by Cornell (1981).”