Abstract
The planetary gearbox is a critical mechanism in helicopter transmission systems. Tooth failures in planetary gear sets will cause great risk to helicopter operations. A crack level estimation methodology has been devised in this paper by integrating a physical model for simulation signal generation and a grey relational analysis (GRA) algorithm for damage level estimation. The proposed method was calibrated firstly with fault seeded test data and then validated with the data of other tests from a helicopter transmission test rig. The estimation results of test data coincide with the actual test records, showing the effectiveness and accuracy of the method in providing a novel way to hybrid model based methods and signal analysis methods for more accurate health monitoring and condition prediction.
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