Abstract
Abstract : Features based on empirical mode decomposition (EMD) of measured vibration data were developed for a Bell OH-58 helicopter main rotor gearbox. A tooth on the input pinion of the gearbox was notched and run for an extended period at several over-torque conditions to induce a tooth fracture. Vibration data were recorded at regular intervals until a tooth fractured. The EMD features were found to be more sensitive to the gearbox condition than the kurtosis-based feature (FM4), and they diagnosed the onset of cracked tooth much earlier.
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