Planetary gearbox is an important component widely used in mechanical transmission. When a pair of gears mesh, due to inevitable errors such as tooth pitch and tooth shape, meshing impact will occur during operation, resulting in noise corresponding to the gear meshing frequency. Friction noise also occurs between tooth surfaces due to opposite sliding. As gears are the fundamental components in gearbox transmission, reducing gear noise is essential for controlling gearbox noise. Generally speaking, the main reasons for gear system noise are as follows:
