Gear noise is a common evil any gear manufacturer must live with. It is often low enough not to be a major problem but, at times, gear whining may appear and then, tracking the source and, especially, curing the ill can be tricky at best. A large number of publications, too numerous to be listed here, have been published on gear noise; the work of Endo and Sawalhi is a typical example (Ref. 1). However, once the gearbox is in production, such models are of little use.
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