PREDICTIVE MAINTENANCE DISPLAY SYSTEM

• US 20030216888A1
• Filed: 03/28/2001
• Published: 11/20/2003
• Est. Priority Date: 03/28/2001
• Status: Active Grant

• Current Assignee: Westinghouse Electric Company LLC (Brookfield Asset Management Incorporated)
• Original Assignee: Westinghouse Electric Company LLC (Brookfield Asset Management Incorporated)
• Inventors: Ridolfo, Charles F.
• Granted Patent: US 6,735,549 B2
• Time in Patent Office: Days
• US Class Current: 702/181
• CPC Class Codes: G05B 23/0283 Predictive maintenance, e.g. involving the monitoring of a system and, based on the monitoring results, taking decisions on the maintenance schedule of the monitored system; Estimating remaining useful life [RUL] preventive maintenance, i.e. planning maintenance according to the available resources without monitoring the system G06Q10/06

Abstract

A display system in which subsequent failures of plant equipment and plant systems are predicted to occur and in which the probability of failure before a specified date and the probability of failure after a specified date is determined and displayed and in which the calendar date is determined and displayed when the desired probability that the equipment not fail prior to the calendar date is specified. The system includes an Equipment Failure And Degradation Module that determines the remaining equipment/system life; a Probability-of-Failure Predictor Module that determines the probability of the equipment/system failing prior to a specified date and the probability of the equipment/system failing after a specified date; and a Date-of-Failure Predictor Module that determines the calendar date that corresponds to a specified probability that equipment not fail prior to the date.

Claims

1. A maintenance display for predicting the optimum date on which components in a system are to be serviced, comprising:

a sensor system for monitoring a parameter indicative of an operating condition of at least one of the components in the system;

an Equipment Failure And Degradation Module that receives an input from the sensor system and from the sensor system input determines if the component monitored in the system is in imminent danger of failing and the predicted remaining component life the monitored component; and

a probability of failure predictor module that determines and displays, for a specified date, the probability that a failure in the monitored component will occur prior to the specified date.

2. The maintenance display of claim 1 wherein the Probability-of-Failure Predictor Module determines the probability that a failure in the monitored component will occur prior to the specified date from a failure distribution model for the monitored component developed by the Equipment Failure And Degradation Module.

3. The maintenance display of claim 2 wherein the failure distribution model is based on a Normal Distribution.

4. The maintenance display of claim 1 wherein the Probability-of-Failure Predictor Module determines the probability that a failure in the monitored component will occur prior to the specified date from a combination of probabilities of failure of sub-components of the monitored component.

5. The maintenance display of claim 4 wherein the combination of probabilities is expressed as set forth in equation (1), extrapolated for the number of sub-components monitored.

6. The maintenance display of claim 1 wherein the Probability-of-Failure Predictor Module displays the probability of failure of the monitored component after the specified date.

7. The maintenance display of claim 1 including a Date-of-Failure Predictor Module that determines and displays for a specified probability the date that the monitored component not fail prior to that date.

8. The maintenance display of claim 7 wherein the Date-of-Failure Predictor Module displays the probability of failure of the monitored component after the determined date.

9. A maintenance display for predicting the optimum date on which components in a system are to be serviced, comprising:

a sensor system for monitoring a parameter indicative of an operating condition of at least one of the components in the system;

an equipment failure and degradation module that receives an input from the sensor system and from the sensor system input determines if the component monitored in the system is in imminent danger of failing and the predicted remaining component life of the monitored component; and

,

a Date-of-Failure Predictor Module that determines and displays, for a specified probability of failure, the date that a failure in the monitored component will likely occur prior to the specified probability.

10. The maintenance display of claim 9 wherein the Date-of-Failure Predictor Module determines the date that a failure in the monitored component will likely occur for the specified probability from a failure distribution model for the monitored component developed by the equipment failure and degradation module.