LIFE EXPIRATION PREDICTING METHOD, LIFE EXPIRATION PREDICTING APPARATUS, LIFE EXPIRATION PREDICTING SYSTEM, LIFE EXPIRATION CALCULATING APPARATUS, AND ROTARY MACHINE
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United States of America Patent
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Issued Date -
May 14, 2015
app pub date -
Nov 6, 2014
filing date -
Nov 8, 2013
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Abstract
A vibration waveform output by a gyro sensor set in a main pump is received. The vibration waveform is subjected to a frequency analysis and a frequency spectrum is calculated. A feature value is calculated from the frequency spectrum. Life expiration of the main pump is determined using the feature value. When the feature value is represented as R, a sum of squares of amplitudes in the frequency spectrum is represented as D, and a sum of squares of the amplitudes exceeding a first determination value is represented as P, R=√(P/D).
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