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ADAPTIVE SEQUENTIAL PROBABILITY RATIO TEST TO FACILITATE A ROBUST REMAINING USEFUL LIFE ESTIMATION FOR CRITICAL ASSETS
ADAPTIVE SEQUENTIAL PROBABILITY RATIO TEST TO FACILITATE A ROBUST REMAINING USEFUL LIFE ESTIMATION FOR CRITICAL ASSETS
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机译:自适应序贯概率比率测试,可用于对关键资产进行健壮的剩余生命周期估算
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摘要
The system receives a set of present time-series signals gathered from sensors in the asset. Next, the system uses an inferential model to generate estimated values for the set of present time-series signals, and performs a pairwise differencing operation between actual values and the estimated values for the set of present time-series signals to produce residuals. The system then performs a sequential probability ratio test (SPRT) on the residuals to produce SPRT alarms with associated tripping frequency (TF). While the TF exceeds a TF threshold, the system iteratively adjusts sensitivity parameters for the SPRT to reduce the TF, and performs the SPRT again on the residuals. The system then uses a logistic regression model to compute a risk index for the asset based on the TF. If the risk index exceeds a threshold, the system generates a notification indicating that the asset needs to be replaced.
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