Method for predicting life span of rotary machine used in manufacturing apparatus and life predicting system

A method for predicting life span of a rotary machine used in manufacturing apparatus, comprising:

• measuring reference time series data of an acceleration of the rotary machine and evaluation time series data of the acceleration respectively, with a sampling interval being less than a half the cycle of an analysis target frequency, a number of samplings being at least four times the analysis target frequency or more;
• generating reference diagnosis data based on variations in characteristics corresponding to the analysis target frequency by subjecting the reference time series data to a frequency analysis;
• generating evaluation diagnosis data based on variations in a peak value by subjecting the evaluation time series data to the frequency analysis;
• and
• determining the life span of the rotary machine using the reference diagnosis data and the evaluation diagnosis data.

A life predicting system, comprising:

• a rotary machine;
• an accelerometer for sampling and measuring evaluation time series data for an acceleration of the rotary machine with a sampling interval being less than half a cycle of an analysis target frequency, a number of samplings being at least four times the analysis target frequency or more;
• a frequency analysis device for performing a frequency analysis on an output from the accelerometer;
• a peak acceleration transition recording module for generating evaluation diagnosis data based on variations in characteristics corresponding to the analysis target frequency from the evaluation time series data using results of the frequency analysis, and recording the evaluation diagnosis data;
• and
• a life span determination unit for determining life span of the rotary machine using the evaluation diagnosis data.

A life predicting system, comprising:

• a rotary machine;
• an accelerometer for sampling and measuring reference time series data for an acceleration of the rotary machine and evaluation time series data of the acceleration respectively, with a sampling interval being less than half a cycle of an analysis target frequency, a number of samplings being at least four times the analysis target frequency or more;
• a frequency analysis device for performing a frequency analysis on an output from the accelerometer;
• a peak acceleration transition recording module for generating reference diagnosis data based on variations in a peak value of acceleration corresponding to the analysis target frequency from the reference time series data, generating evaluation diagnosis data based on variations in a peak value from the evaluation time series data, with results of the frequency analysis, and recording the reference diagnosis data and the evaluation diagnosis data;
• and
• a life span determination unit for determining life span of the rotary machine using the reference diagnosis data and the evaluation diagnosis data.