Research Papers

Impact Force Based Model for Bearing Local Fault Identification

[+] Author and Article Information
Sidra Khanam

Industrial Tribology, Machine Dynamics, and
Maintenance Engineering Centre (ITMMEC),
Indian Institute of Technology Delhi,
New Delhi 110 016, India
e-mail: sidra.khanam10@gmail.com

J. K. Dutt

Department of Mechanical Engineering,
Indian Institute of Technology Delhi,
New Delhi 110 016, India
e-mail: jkrdutt@yahoo.co.in

N. Tandon

Industrial Tribology, Machine Dynamics, and
Maintenance Engineering Centre (ITMMEC),
Indian Institute of Technology Delhi,
New Delhi 110 016, India
e-mail: ntandon@itmmec.iitd.ernet.in

lCorresponding author.

Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received April 12, 2014; final manuscript received February 24, 2015; published online April 27, 2015. Assoc. Editor: Patrick S. Keogh.

J. Vib. Acoust 137(5), 051002 (Oct 01, 2015) (13 pages) Paper No: VIB-14-1133; doi: 10.1115/1.4029988 History: Received April 12, 2014; Revised February 24, 2015; Online April 27, 2015

Local faults, like spalls in rolling element bearings, give rise to periodic impulsive excitation to the supporting structure. So, an impact based force evaluation, the resulting response analysis of the structure, and experiments are reported in this paper to identify local bearing fault as well as its size. Magnitude and duration of such excitation force are functions of bearing geometry, load, speed, and size of defect. An approach based on the principles of engineering mechanics is followed to obtain a time function of the impact force which is used next to simulate the response of the bearing housing. This response is analyzed in time and frequency domains to get an idea about the bearing fault and its size. Experiments conducted on deep groove ball bearing for different defect sizes and different speeds show acceptable correlation with the theoretical simulation. Hence, the impact based model has laid a theoretical platform to gain insight into the physical phenomena, which is not measured in practice, through impact excitation mechanism and may hold sufficient potential for bearing fault identification.

Copyright © 2015 by ASME
Topics: Stress , Bearings , Vibration
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Fig. 1

Motion of the ball around the defect greater than the contact area

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Fig. 2

Representation of events as a ball negotiates a defect on outer race

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Fig. 3

Bearing geometry with defect on outer race and radial load distribution

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Fig. 4

(a) The toppling event and (b) force deformation behavior at the contact between ball and defect edge

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Fig. 5

Ball's motion while rolling out from the defect

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Fig. 6

Excitation force pulses, (top) for the case when impact force (Fi) > static force (Fs), and (bottom) for when impact force (Fi) < static force (Fs)

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Fig. 8

Flowchart for numerical computation

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Fig. 7

Experimental setup under study: (a) schematic view, (b) schematic view of the system encircled in (a), and (c) vibration model of the ball bearing

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Fig. 9

Excitation force temporal and spectral plots at shaft speed of 1500 rpm; excitation force time variation for (a) 0.35 mm and (b) 2 mm, spectrum of excitation force for (c) 0.35 mm and (d) 2 mm

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Fig. 10

Effect of defect width on the excitation forces (shaft speed = 1500 rpm); enlarged view to depict the point of entry, impact, and TTI

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Fig. 11

Simulated acceleration time response at shaft speed of 1500 rpm (a) for small defect (0.35 mm) and (b) large defects (2 mm)

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Fig. 12

Enlarged view of the acceleration time responses for defects of different sizes to demonstrate the point of entry and impact

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Fig. 13

Theoretical frequency spectra of vibration velocity at shaft speed of 1500 rpm

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Fig. 14

Experimental vibration spectrum of housing for defects of different sizes



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