Rolling Bearing Analysis

Harris, T. A.; Anderson, William J.

doi:10.1115/1.3617048

Cited by 257 publications

(460 citation statements)

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“…Frequency domain features include the power levels of specific bearing defect frequencies compared against known health baseline thresholds, which can be very useful in diagnosing a fault. 3…”

Section: Impactenergy ™ : Bearing Fault Detection and Isolationmentioning

confidence: 99%

Robust wind turbine gearbox fault detection

et al. 2013

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Impact Technologies' participation in the National Renewable Energy Laboratory's Wind Turbine Gearbox Condition Monitoring Round Robin focused on applying multiple vibration diagnostic algorithms to the provided data set. These approaches have been developed and matured by the team in Department of Defense applications for more than 10 years. Generally, the methods employed by the team worked well, once the challenges and peculiarities of the data set were realized. The results of these automated algorithms were also corroborated with visual spectral analysis. Both the blind results, obtained without knowing details on actual gearbox condition, and the conclusions that were drawn after learning the actual damage are each discussed. The algorithms and results are summarized herein. Finally some conclusions and recommendations are provided that may help guide future tests and analysis efforts. Copyright © 2013 John Wiley & Sons, Ltd.

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Section: Impactenergy ™ : Bearing Fault Detection and Isolationmentioning

confidence: 99%

Robust wind turbine gearbox fault detection

et al. 2013

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“…However, in this investigation, the race conformance is specially modified, and JIS B 1518 does not apply. Thus we calculate f c using the following revision of the Lundberg-Palmgren model [11] proposed by Harris [12]:…”

Section: Calculation Of Basic Dynamic Load Ratingmentioning

confidence: 99%

Bearing Resistance of Wind Turbine Generator System

Aso

Aida

Seki³

2015

Electrical Engineering Japan

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SUMMARY The vertical axis wind turbine generator is mainly used for small size wind turbine applications, and is independent of wind direction. Its rotating part (shaft unit) should be rotated by an extremely small torque so as to increase the generation efficiency. However, commercially available bearings are not necessarily suitable for the shaft unit because their static and dynamic load ratings are frequently larger than those required for the vertical axis wind turbine. As a result, the frictional force and the rotating torque of commercially available bearings are too large for the shaft unit to rotate lightly. In this study, through an experiment with an actual vertical axis wind turbine, the bearings used for the shaft unit are reviewed in accordance with IEC61400‐2. Design of a shaft unit with the bearings having the most suitable load rating and frictional force for the vertical axis wind turbine is attempted. The newly designed shaft unit will be applied to the vertical axis wind turbine and will be tested.

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“…The best known methods are based on measurements of vibrations with accelerometers, measurements of microdisplacements of bearing rings, measurements of temperature and friction moment, and determination of bearing damage by observing changes in the acoustic emission of a bearing. [3][4][5][6] All the above-stated methods evaluate the changes in amplitude values in the time and frequency domain and the appearance of new higher multiples of the basic frequency through frequency analysis (fast Fourier transform). The methods that are used for bearings mounted on relatively stiff structures and working at higher speeds are frequently not very suitable for monitoring the changes and growth of bearing raceway damage when the described rotational connections are in operation.…”

Section: Rolling Rotational Connectionsmentioning

confidence: 99%