Resumo

RUIZ-BARRIOS, Mario L.; HERNANDEZ-MONTERO, Fidel E.; PALOMINO-MARIN, Evelio  e  GOMEZ-MANCILLA, Julio C.. Tacho-less Automatic Gear Fault Detection. Ingeniería Mecánica [online]. 2019, vol.22, n.1, pp. 32-40. ISSN 1815-5944.

In this work, a method was developed and validated toautomatically detect gear fault when the rotational speed is unknown and variable, without using a tachometer. In this method are used the synchronous fault detection based on Lock-in amplifiers (LIA) and an algorithm for automatically estimating the rotation speed. The rotation speed estimation is based on the vibration signaldecomposition into monocomponent signals and the non-quadratic phase coupling analysis.With the proposed method was possible to detect a faulty gear (with broken tooth) in the gearbox of 3 MW wind turbine. This method can be effectively applied in conditions of rotation speed variation up to 30% even for low signal-to-noise ratio (SNR).

Palavras-chave : gear diagnostic; lock-in amplifier; amplitude modulation; Singular Spectrum Decomposition.

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