RESEARCH PAPERS: Mechanical Signature Analysis Papers

Effect of Inter-Modulation and Quasi-Periodic Instability in the Diagnosis of Rolling Element Incipient Defect

[+] Author and Article Information
C. C. Osuagwu

Department of Electronic and Electrical Engineering, University of Nigeria, Nsukka, Anambra State, Nigeria

D. W. Thomas

Department of Electronics, University of Southampton, England

J. Mech. Des 104(2), 296-302 (Apr 01, 1982) (7 pages) doi:10.1115/1.3256339 History: Received June 09, 1981; Online November 17, 2009


The absence of significant peaks at the fundamental rotational frequencies, indicative of a particular defect such as an outer race fault, results in a failure of the power spectrum technique to detect and diagnose mechanical defects characterized by sounds of short duration. Based on the results of an incipient defect diagnosis, explanations are offered as to the cause of the missing fundamental in the power spectrum in terms of two different effects which may operate simultaneously; they are 1 An average and shift effect which causes a slow migration of the fundamental impact frequency from its computed value; and 2 An inter-modulation effect which translates defect related information to frequency locations unrelated to the fundamental impact frequency. The paper goes on to show that fault detection and diagnosis are possible despite the absence of a significant peak at the fundamental rotational frequency.

Copyright © 1982 by ASME
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