A Novel Nonlinear Transmissibility Function-Based Method for Diagnosing Shaft Cracks of Rotating Machineries

Vibration control is important for the safe and stable operation of generator units. The vibration transfer characteristics of small- and medium-sized turbo generators are different from those of large capacity units due to differences in mechanical structures. We point out that the vibration on small- and medium-sized turbo generators propagates through their foundation from one bearing to another, rather than through the shafting. In particular, transmission of horizontal vibration measured on bearings is found to be more significant compared with vertical and axial vibration due to the height of the bearing pedestal. We demonstrate through three successful diagnostic practices the process of vibration transmission on small and medium-sized turbo generators. The present work can serve as a reference for the same type of unit as well as other similarly structured rotating machineries.

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Overlapping Group Sparsity Induced Condition Monitoring in Rotating Machineries

Advances in Intelligent Systems and Computing - Proceedings of the Eighth International Conference on Soft Computing and Pattern Recognition (SoCPaR 2016) ◽

10.1007/978-3-319-60618-7_40 ◽

2017 ◽

pp. 409-418 ◽

Cited By ~ 1

Author(s):

Athira Chandran ◽

T. Anjali ◽

Neethu Mohan ◽

K. P. Soman

Keyword(s):

Condition Monitoring ◽

Group Sparsity ◽

Overlapping Group Sparsity ◽

Rotating Machineries

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Warped Variational Mode Decomposition With Application to Vibration Signals of Varying-Speed Rotating Machineries

IEEE Transactions on Instrumentation and Measurement ◽

10.1109/tim.2018.2869440 ◽

2019 ◽

Vol 68 (8) ◽

pp. 2755-2767 ◽

Cited By ~ 7

Author(s):

Shiqian Chen ◽

Yang Yang ◽

Xingjian Dong ◽

Guanpei Xing ◽

Zhike Peng ◽

...

Keyword(s):

Variational Mode Decomposition ◽

Vibration Signals ◽

Mode Decomposition ◽

Rotating Machineries

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(5) Solving Nonsynchronous Vibration Problems of Large Rotating Machineries by Exciting Test in Actual Operating Condition

Journal of the Society of Mechanical Engineers ◽

10.1299/jsmemag.91.834_405_1 ◽

1988 ◽

Vol 91 (834) ◽

pp. 405

Author(s):

Hiroshi KAMIYOSHI ◽

Akio HIZUME ◽

Hisashi FUJII ◽

Tetsuya YAMAMOTO ◽

Takashi ICHIMURA

Keyword(s):

Operating Condition ◽

Actual Operating ◽

Vibration Problems ◽

Rotating Machineries

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A proposal for rotating machineries analysis by considering the unknown equal potential condition on FEM

IEEE Transactions on Magnetics ◽

10.1109/20.376367 ◽

1995 ◽

Vol 31 (3) ◽

pp. 1722-1724 ◽

Cited By ~ 6

Author(s):

N. Igura ◽

T. Shimomura ◽

K. Harada ◽

Y. Ishihara ◽

T. Todaka

Keyword(s):

Potential Condition ◽

Rotating Machineries

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Maximal-overlap adaptive multiwavelet for detecting transient vibration responses from dynastic signal of rotating machineries

Science China Technological Sciences ◽

10.1007/s11431-013-5382-3 ◽

2013 ◽

Vol 57 (1) ◽

pp. 136-150 ◽

Cited By ~ 2

Author(s):

ShuiLong He ◽

YanYang Zi ◽

ChenLu Zhao ◽

BinQiang Chen ◽

XiaoDong Wang ◽

...

Keyword(s):

Transient Vibration ◽

Vibration Responses ◽

Rotating Machineries

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Development of a Measurement System for Analyzing Periodic External Forces Acting on Rotating Machineries

Journal of Dynamic Systems Measurement and Control ◽

10.1115/1.4043759 ◽

2019 ◽

Vol 141 (10) ◽

Cited By ~ 2

Author(s):

Shota Yabui ◽

Tsuyoshi Inoue

Keyword(s):

Measurement System ◽

Adaptive Algorithm ◽

Journal Bearing ◽

Magnetic Bearing ◽

Contact Forces ◽

Active Magnetic Bearing ◽

Rotating Shaft ◽

Rotating System ◽

External Forces ◽

Rotating Machineries

In this study, a measurement system is developed to analyze periodic external forces acting on a rotating machinery. The dynamics of a rotating machineries are influenced by various periodic external forces such as unbalanced forces, oil film forces at a journal bearing, and seal contact forces. The characteristics of periodic external forces are dependent on the rotating conditions, rotational speed, and rotating orbit of the rotating shaft. The proposed system employs an active magnetic bearing (AMB), which is implemented using an adaptive feed-forward cancellation (AFC). The use of AFC ensures that the proposed system can realize the desired harmonic orbit assuming actual operations under the periodic external forces. Moreover, AFC can measure the periodic external forces in real-time using an adaptive algorithm. The effectiveness of the proposed system is verified experimentally. Experimental results show that the control system can control the rotating shaft to an accuracy of micrometer order using the implemented AFC. The measurement error of the periodic external forces acting on the rotating system is less than 2%.

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