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Technical Brief

Dynamics Characteristics and Diagnosis of a Rotor-Bearing's System Through a Dimensional Analysis Approach: An Experimental Study

[+] Author and Article Information
R. G. Desavale

Design Engineering Section,
Department of Mechanical Engineering,
Rajarambapu Institute of Technology,
Rajaramnagar Shivaji University,
Kolhapur 415 414, Maharashtra, India
e-mails: ramdesavale@rediffmail.com;
ramchandra.desavale@ritindia.edu

Contributed by the Design Engineering Division of ASME for publication in the JOURNAL OF COMPUTATIONAL AND NONLINEAR DYNAMICS. Manuscript received March 7, 2018; final manuscript received October 20, 2018; published online November 20, 2018. Assoc. Editor: Tsuyoshi Inoue.

J. Comput. Nonlinear Dynam 14(1), 014501 (Nov 20, 2018) (11 pages) Paper No: CND-18-1092; doi: 10.1115/1.4041828 History: Received March 07, 2018; Revised October 20, 2018

In this work, vibration characteristic diagnosis of misalignment rotor in loosely fitted bearing is investigated using dimensional analysis (DA) approach. A comprehensive empirical model (EM) using nondimensional parameters is developed to diagnose the rotor-bearing system, and EM model has been validated through an experimental setup developed in-house. Experiments are performed for various defects such as misalignment and bearing looseness. The EM results can be used to monitor the real-time conditions of the rotor-bearing system. This work also presents the effect of misalignment and bearing looseness under various load and speed conditions. Further, work has been extended to predict the combined effect of bearing looseness and misalignment. It has been found that EM model predictions of the vibration amplitude are better when compared to experimental results.

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References

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Figures

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Fig. 1

Experimental setup

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Fig. 2

The frequency response of healthy bearing at 1000 rpm in horizontal directions: (a) 200 N, (b) 300 N, and (c) 400 N

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Fig. 3

The frequency response of healthy bearing at 750 rpm in horizontal directions: (a) 200 N, (b) 300 N, and (c) 400 N

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Fig. 4

The frequency response of healthy bearing at 1200 rpm in horizontal directions : (a) 200 N, (b) 300 N, and (c) 400 N

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Fig. 5

Photograph of looseness between inner race and sleeve of bearing

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Fig. 6

The frequency response of loosely fitted bearing at750 rpm in horizontal directions: (a) 200 N, (b) 300 N, and (c) 400 N

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Fig. 7

The frequency response of loosely fitted bearing at 1000 rpm in horizontal directions: (a) 200 N, (b) 300 N, and (c) 400 N

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Fig. 8

The frequency response of loosely fitted bearing at 1200 rpm in horizontal directions: (a) 200 N, (b) 300 N, and (c) 400 N

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Fig. 9

Photograph of angular misalignment

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Fig. 10

The frequency response of combined bearing fault at750 rpm in horizontal directions: (a) 200 N, (b) 300 N, and (c)400 N

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Fig. 11

The frequency response of combined bearing fault at 1000 rpm in horizontal directions: (a) 200 N, (b) 300 N, and (c) 400 N

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Fig. 12

The frequency response of combined bearing fault at 1200 rpm in horizontal directions: (a) 200 N, (b) 300 N, and (c) 400 N

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Fig. 13

Amplitude of vibration for healthy bearing

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Fig. 14

Amplitude of vibration for loosely fitted bearing

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Fig. 15

Amplitude of vibration amplitude for combine fault bearing

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