[논문]Bearing fault diagnosis under unknown variable speed via gear noise cancellation and rotational order sideband identification

Wang, T.; Liang, M.; Li, J.; Cheng, W.; Li, C.

doi:10.1016/j.ymssp.2015.03.005

Bearing fault diagnosis under unknown variable speed via gear noise cancellation and rotational order sideband identification

Mechanical systems and signal processing, v.62/63, 2015년, pp.30 - 53

Wang, T. , Liang, M. , Li, J. , Cheng, W. , Li, C.

Abstract ▼ AI-Helper

The interfering vibration signals of a gearbox often represent a challenging issue in rolling bearing fault detection and diagnosis, particularly under unknown variable rotational speed conditions. Though some methods have been proposed to remove the gearbox interfering signals based on their discrete frequency nature, such methods may not work well under unknown variable speed conditions. As such, we propose a new approach to address this issue. The new approach consists of three main steps: (a) adaptive gear interference removal, (b) fault characteristic order (FCO) based fault detection, and (c) rotational-order-sideband (ROS) based fault type identification. For gear interference removal, an enhanced adaptive noise cancellation (ANC) algorithm has been developed in this study. The new ANC algorithm does not require an additional accelerometer to provide reference input. Instead, the reference signal is adaptively constructed from signal maxima and instantaneous dominant meshing multiple (IDMM) trend. Key ANC parameters such as filter length and step size have also been tailored to suit the variable speed conditions, The main advantage of using ROS for fault type diagnosis is that it is insusceptible to confusion caused by the co-existence of bearing and gear rotational frequency peaks in the identification of the bearing fault characteristic frequency in the FCO sub-order region. The effectiveness of the proposed method has been demonstrated using both simulation and experimental data. Our experimental study also indicates that the proposed method is applicable regardless whether the bearing and gear rotational speeds are proportional to each other or not.

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참고문헌 (17)

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Bearing fault diagnosis under unknown variable speed via gear noise cancellation and rotational order sideband identification

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