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Anomaly detection of tripod shafts using modified Mahalanobis distance

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Abstract

The tripod shafts used in high-speed trains transmit the power of a motor to axle reduction units. A tripod shaft is designed as a shaft with a protective fuse because the load applied to the reduction units is very large during operation. Fuse failure can lead to accidents and economic loss, such as train service interruption and repair problems at the accident site. Therefore, detecting the faults of fuses used in tripod shafts by using sensors is necessary. In this study, torsion fatigue tests for the failure modes were conducted, and strain data were collected by strain sensors from around the fuse of the shaft. The modified Mahalanobis distance was employed as the health indicator, and the fuse thresholds for the anomaly detection (AD) were defined using the three-sigma method. The AD performance of the tripod shafts was evaluated by comparing the results with real crack detection times.

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Correspondence to Insu Jeon or Dong-Cheon Baek.

Additional information

Sunghyun Lee is a Ph.D. candidate of Mechanical Engineering at Chonnam National University, Republic of Korea. He is also studying at the Department of Reliability Assessment at the Korea Institute of Machinery and Materials. His research interests include fault detection and prognostics of mechanical systems.

Jong-Won Park received his B.S. and M.S. degrees in Mechanical Engineering from Hongik University in 1996 and 1998, respectively. He received his Ph.D. from Seoul National University in 2003. He joined the Department of Reliability Assessment at the Korea Institute of Machinery and Materials in 2003, and is now the Head of the department. His research interests include mechanical system analysis and control, reliability assessment via accelerated life test, system reliability analysis, and artificial intelligence.

Do-Sik Kim is a Senior Researcher at the Department of Reliability Assessment at the Korea Institute of Machinery and Materials. He received his Ph.D. in Mechanical Design Engineering from Chungnam National University in 2017. His research interest includes power transmission units in heavy-duty vehicles.

Insu Jeon received his Ph.D. in Mechanical Engineering from the Korea Advanced Institute of Science and Technology in 2000. He joined the School of Mechanical Engineering at Chonnam National University in 2006 as a faculty member. His research interests incude fracture mechanics, biomechanics, and biomaterials.

Dong-Cheon Baek is a Senior Researcher at the Department of Reliability Assessment at the Korea Institute of Machinery and Materials. He received his B.S., M.S., and Ph.D. (2009) in Mechanical Engineering from the Korea Advanced Institute of Science and Technology. His research interests include is the prognostics and health management of the mechanical system.

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Lee, S., Park, JW., Kim, DS. et al. Anomaly detection of tripod shafts using modified Mahalanobis distance. J Mech Sci Technol 32, 2473–2478 (2018). https://doi.org/10.1007/s12206-018-0504-2

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  • DOI: https://doi.org/10.1007/s12206-018-0504-2

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