Gearbox has been widely used in various fields. It is applied as the common component to transmit power and shift speed in mechanical equipments. The working condition of a gearbox can be extremely bad, which make parts of the gearbox fail eas-ily. As a result, it is significant to monitor and diagnosis gearbox in order to evaluate the running condition of a machinery. The signal processing method based on SK had been developed recently as a new faults diagnosis way. Due to its novel ability of separating t...