“…The field involved with cogwheels is vast, and yet most work in the literature has been performed in the context of gearboxes or bearing systems [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ], i.e., many gears are inside in a system and attached to each other. For such systems, the main focus of fault detection lies on a system failure dealing with conditions monitoring in lifespan analysis, which occurs mainly due to malfunctioning components suffering from wear, abrasion and pollution, such as sand or lubrication.…”