Abstract
This paper deals with a failure diagnosis and an evaluation of dynamic characteristics in gear sets. The Wavelet Transform (WT) is a method for the time-frequency analysis. The dynamic characteristics of both steel and sintered gears were measured using a power circulating gear testing machine and were analyzed in a time-frequency domain by the continuos and discrete WTs. Furthermore, the health monitoring of gear sets was carried out and the tooth surface failure by pitting was diagnosed using the WTs. The vibration acceleration of the gear box could be divided to two different behaviors above and below the tooth mesh frequency. A failed tooth could be found out by the change of WT intensity of the vibration acceleration. It could be said that the continuous and discrete wavelet transforms are a useful method for diagnosing the tooth failure and for evaluating the gear dynamics.
