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RESEARCH PAPERS

Vibration Response of Rolling Element Bearings in a Rotor Bearing System to a Local Defect Under Radial Load

[+] Author and Article Information
A. Choudhury

Mechanical Engineering Department, Sikkim Manipal Institute of Technology, Sikkim, India

N. Tandon1

ITMME Centre, Indian Institute of Technology, Hauz Khas, New Delhi–110016, Indiantandon@itmmec.iitd.ernet.in

1

Corresponding author.

J. Tribol 128(2), 252-261 (Dec 08, 2005) (10 pages) doi:10.1115/1.2164467 History: Received April 07, 2005; Revised December 08, 2005

In the present investigation, a theoretical model has been developed to obtain the vibration response due to a localized defect in various bearing elements in a rotor-bearing system under radial load conditions. The rotor-bearing system has been modeled as a three degrees-of-freedom system. The model predicts significant components at the harmonics of characteristic defect frequency for a defect on the particular bearing element. In the case of a defect on the inner race or a rolling element, the model predicts sidebands about the peaks at defect frequencies, at multiples of shaft and cage frequencies, respectively. The model has also predicted some additional components at harmonics of shaft and cage frequencies due to a local defect on the inner race and a rolling element, respectively. The expressions for all these spectral components have also been derived. Typical numerical results for an NJ 204 bearing have been obtained and plotted. The amplitude of the component at defect frequency, for an outer race defect, is found to be much higher as compared to those due to inner race defect or a rolling element defect of the same size and under similar conditions of load and speed. The results of vibration measurements on roller bearings with simulated local defects have also been presented to experimentally validate the theoretical model proposed. It can be observed from the results that the spectral components predicted by the theoretical model find significant presence in the experimental spectra. Comparison of the normalized analytical values of the spectral components with their experimental values shows fair agreement for most of the cases considered. Probable area of the generated excitation pulses has been calculated and the effects of pulse area variation on the experimental results have been studied.

Copyright © 2006 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

A sketch of (a) bearing test rig; (b) the loading arrangement

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Figure 2

The three-DOF model representing the rotor bearing setup

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Figure 3

Generation of excitation force for radial vibration measurement

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Figure 4

A rectangular pulse form

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Figure 5

The frequency spectra for the velocity of the housing due to an outer race defect

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Figure 6

The frequency spectra for the velocity of the housing due to an inner race defect. ▴: rωs; ×: ωid; ∎: ωid±rωs.

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Figure 7

The frequency spectra for the velocity of the housing due to a rolling element defect. ▴: rωc; ×: ωred; ∎: ωred±rωc.

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Figure 8

Vibration velocity spectra for an NJ 204 bearing with 0.5mm defect on the inner race at 75Kg load and 1500rpm

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Figure 9

Comparison of experimental and theoretical values of amplitudes of spectral components for an NJ 204 bearing at 75Kg load and 1500rpm with 0.5mm wide defect on the inner race

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Figure 10

Comparison of experimental and theoretical values of amplitudes of spectral components for NJ 204 bearing with 2mm wide defect on the inner race at 75Kg load and 250rpm

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Figure 11

Comparison of experimental and theoretical values of amplitudes of spectral components for NJ 204 bearing with 2mm wide defect on the inner race at 75Kg load and 1000rpm

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Figure 12

Comparison of experimental and theoretical values of amplitudes of spectral components for NJ 204 bearing with 2mm wide defect on the inner race at 75Kg load and 1500rpm

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Figure 13

Comparison of experimental and theoretical values of amplitudes of spectral components for NJ 204 bearing with a 0.5mm wide defect on a roller at 125Kg load and 1500rpm

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Figure 14

Pulse area for an inner race defect in NJ 204 bearing at 1500rpm

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Figure 15

Pulse area for an inner race defect of 2mm width in NJ 204 bearing at 75Kg load

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