Determination of vibration alert level in condition monitoring of rotatng machinery
Abstract
The setting of alarm levels plays a vital role in a machinery
condition monitoring and diagnostic system. Two
approaches to set vibration alarm levels using vibration
signals produced by shipboard fire pumps are presented for
the time and frequency domains. In the time domain, cross
peak analysis (CPA) is proposed to extract the dominate
peak points. The distribution of these cross peak points is
found to have a lognormal distribution and can be
normalized to a Normal distribution in the VdB domain. The
computed ~+2a value in the VdB domain is the suggested
alarm level. In the frequency domain, 111 octave band
analysis (OBA) is introduced. An artificial fauil simulation
was conducted to compare 111 OBA wkh the broadband
method. The result shows that 111 OBA is more sensitive to
changes in VdB level than the broadband method.
Description
Conference: 1994 IMAC XII - 12th International Modal Analysis Conference
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
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