A Model for Study of the Defects in Rolling Element Bearings at Higher Speed by Vibration Signature Analysis

The vibrations produced by a single point defect on various parts of the bearing under constant radial load are predicted by using a theoretical model. The model includes variation in the response due to the effect of bearing dimensions, rotating frequency distribution of load. The excitation forces are generated when the defects on the races strike to rolling elements. In case of the outer ring defect, the pulses generated are with periodicity of outer ring defect frequency where as for inner ring defect, the pulses are with periodicity of inner ring defect frequency. The effort has been carried out in preparing the physical model of the system. Different defect frequencies are obtained and are used to find out the amplitudes of the vibration due to excitation of the bearing parts. Increase in the radial load or severity of the defect produces a significant change in bearing signature characteristics.

Authors:

• Abhay Utpat
• R. B. Ingle
• M. R. Nandgaonkar

Keywords:

• Condition monitoring
• defect frequency
• rolling element
• vibration response.

References:

[1] P. D. Mcfadden And J. D. Smith, "Model For The Vibration Produced
By ASingle Point Defect In A Rolling Element Bearing", Journal of
Sound And Vibration (1984) 96(L), 69-82.
[2] M F White, ""Rolling Element Bearing Vibration Transfer
Characteristics:Effect of Stiffness," ASME J. Appl. Mech., 46, pp. 677-
684, 1979.
[3] D. Smith ,"Vibration monitoring of bearings at low speeds, Tribology
Int.June 1982,p-139
[4] Igarashi and H. Hamada Bulletin of the Japan Society of Mechanical
Engineers 25, 994-1001 (Studies on the vibration and sound of defective
rolling bearings ,first report vibration of ball bearings with one
defect)1982.
[5] Wardle, F. P., , "Vibration Forces Produced by Waviness of the Rolling
Surfaces of Thrust Loaded Ball Bearings Part 1: Theory, Procd.. of the
Inst of Mechanical Engg,202, 1988,No.C5,pp305-312.
[6] G.S. Yadava, K.M. Ramakrishna,N. Tandon, "A comparison of some
condition monitoring techniques for the detection of defect in induction
motor ball bearings", Mechanical Systems and Signal Processing 21
(2007) 244-256.
[7] P.N. Botsaris, "A Preliminary Estimation of Analysis Methods of
Vibration Signals at Fault Diagnosis in Ball Bearings," 4th International
conference on NDT, Chania, Crete-Greece, 11-17Oct2007.
[8] Harris, T. A., 1966, Rolling Bearing Analysis, John Wiley, New York.
[9] B C Majumdar, "Introduction to Tribology of the Bearings", Ist Edi,
Wheeler & Co .Alahabad,1986.
[10] Eschmann, P., 1985, Ball and Roller Bearings-Theory, Design and
Application, John Wiley, NY.