Data processing: measuring – calibrating – or testing – Measurement system – Performance or efficiency evaluation
Reexamination Certificate
2005-08-09
2005-08-09
Bui, Bryan (Department: 2863)
Data processing: measuring, calibrating, or testing
Measurement system
Performance or efficiency evaluation
C702S182000, C702S184000
Reexamination Certificate
active
06928391
ABSTRACT:
Data on inspection, diagnosis, repair and operation histories are entered in a plant-maintenance apparatus for equipment that constitute a plant to be maintained. Failure-event tree breakdown is performed on failures to be expected for the equipment. Unreliability is predicted of at least one starting item in the failure-event tree breakdown. Unreliability of each item in the failure-event tree is calculated based on a failure unreliability function. Unreliability and a cost of recovery from each failure event in the failure-event tree are multiplied and results of the multiplication are accumulated in accordance with the tree breakdown to obtain a recovery cost. Preventive maintenance expenses are calculated for preventing failure events. Maintenance timing and technique are decided through comparison between the recovery cost and the preventive maintenance expenses.
REFERENCES:
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patent: 5648919 (1997-07-01), Yamauchi et al.
patent: 5970437 (1999-10-01), Gorman et al.
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U.S. Appl. No. 10/409,277, filed Apr. 9, 2003, Fujiyama et al.
Asatsu Seiichi
Fujiwara Toshihiro
Fujiyama Kazunari
Harada Shigeru
Hirawawa Taiji
Foley & Lardner LLP
Kabushiki Kaisha Toshiba
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