Abstract
Planetary gearbox plays an important role in large and complex mechanical equipment due to the advantage that it can provide larger transmission ratio in a compact space than fixed shaft gearbox. However, its fault diagnosis is a dilemma due to the special structure and harsh working conditions. This paper applies Empirical Mode Decomposition (EMD) and Euclidean Distance Technique (EDT) for planetary gearbox feature selection and fault diagnosis. EMD is a self-adaptive signal processing method that can be applied to non-linear and non-stationary signal and it can also get the aim of de-noising. EDT can give out the quantitative fault diagnosis result. And its theoretical knowledge is easy to understand. An intrinsic mode function (IMF) selection method based on energy ratio is proposed to select IMFs which include sensitive fault information. A two-stage feature selection and weighting method based on EDT is applied to get a new combinative feature and 36 feature parameters are extracted before this process. Then, the feature vector matrix of each raw signal can be computed out by extracting the new combinative feature from every IMF. Finally, the diagnosis result can be obtained through calculating the Euclidean Distance value between two feature vector matrixes. Namely, the health state of the tested signal is as same as the trained signal which the Euclidean Distance between them is the minimum. The performance of the proposed method is validated by experimental data and industrial data.
Highlights
Due to the advantage that it can provide larger transmission ratio in a compact space than fixed shaft gearbox, planetary gearbox is increasingly used in many kinds of rotary machinery in recent years, such as wind turbines, cranes and military equipment, etc
Frequency spectrum analysis is very difficult. It can draw a conclusion from the analysis described above that planetary gearbox fault diagnosis is very difficult
This paper proposed a feature selection and fault diagnosis method based on Empirical Mode Decomposition (EMD) and Euclidean Distance Technique (EDT)
Summary
Due to the advantage that it can provide larger transmission ratio in a compact space than fixed shaft gearbox, planetary gearbox is increasingly used in many kinds of rotary machinery in recent years, such as wind turbines, cranes and military equipment (e.g. tanks and helicopter), etc. The special internal structure and the harsh working conditions make it very difficult to the fault diagnosis of the planetary gearbox [1]. The main components of a single stage planetary gearbox usually consist of one sun gear, one ring gear, one planet carrier and three or four planet gears. Because of the special structure and adverse working conditions, the fault feature frequencies of planetary gearbox are very low (such as the fault feature frequencies of planet gear and ring gear) and along with serious noise pollution. The feature extraction of planetary gearbox is very difficult
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